| Introduction: |
Dr. Ray joined NML Jamshedpur as Scientist –C in MTE Division (Dec 1990-Nov 1995). He was promoted to Scientist –EI (1.12.95-30.11.00), Scientist-EII (1.12.00-30.11.05) and Scientist –F (Deputy Director, 1.12.05-30.11.10). At present he is working as Scientist G (Chief Scientist) since 1.12.2010). After joining NML Jamshedpur as Scientist C on 1.12.1990, Dr. Ray worked as the principal investigator in a Grant-in- Aid (INDO-US) project and had designed, developed and used an articulated bridge fixture to precrack ceramic composite samples with 100 % success in fatigue crack growth rate and fracture toughness studies of 25 wt% SiC whisker reinforced alumina composite. Precracking of ceramic samples with 100% success was done in India, for the first time. |
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| Research Area: |
Creep, Fatifue and Fracture of advanced ceramics,remaing Life assement and damage quantification of service exposed components in power plants, petrochemical industries, fertilizers and oil refinery |
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| Major Projects Undertaken: |
1) Remaining life assessment of hydrogen reformer ,pig tail, crude distillation heater and visbreaker tubes;, sponsored by Mangalore refinery and Petrochemicals Ltd., contract value : (Rs 37.12 Lakhs) PI (project initiator & coordinator Jan 2013 March 2014 Applied
2) Evaluation of stress ruptures tubes of boiler tubes, sponsored by Shah Alloys Ltd, Gujarat, (Project No-SSP 0638); contract value: (Rs 11.03Lakhs) PI (project initiator & coordinator) November 2010 October 2012 Applied
3)RLA of FPU-D1 column shell plates, sponsored by BPCL Mumbai, (Project No-SSP 0663); contract value: (Rs 11.03Lakhs) PI (project initiator & coordinator) Feb 2011 Sept 2011 Applied
4. RLA of service exposed CCU reactor plates, sponsored by BPCL Mumbai (Project No-SSP 0651); contract value: (Rs 11.03Lakhs) PI (project initiator & coordinator) Jan 2011 Aug 2011 Applied
5. Health assessment studies of reformer of hydrogen unit-I ( at Gujarat Refinery), sponsored by Indian Oil Corporation Ltd Jawaharnagar, Vadodara(SSP-0590); contract value: (Rs 8.047 Lakhs) PL April 2010 March 2011 Applied
6.Studies on creep mechanism and statistical analysis of service exposed P-22 grade of steel. (Project No :OLP 0129) PL Feb 2010 Jan 2011 In House R&D Project
7. NHGU heater tube life assessment; sponsored by BPCL Mumbai, (SSP-0581);contract value:(Rs 10.03 Lakhs) PL March 2010 Dec 2010 Applied
8. Remaining Life Assessment Study of Primary Reformer Catalyst Tube of Primary Reformer; Sponsored by:National Fertilizer Limited, Guna (Project No: SSP-9458); contract value: ( Rs 3.40 Lakhs) PL Nov2008 April 2009 Applied
9. Efficacy of thermal barrier coatings for gas turbine application, (TAREMAC-CSIR Inter Laboratory Project NWP 0027);contract value:(Rs 50.00 Lakhs) PL April 2008 March 2013 Basic and Applied
10. RLA studies of CCU reactor, stripper vessel and column plates, sponsored by BPCL Mumbai, (Project No-SSP 9400); contract value: (Rs 20.20 Lakhs) PL Feb 2008 April 2009 Applied
11. RLA studies and failure analysis of service exposed reformer tubes,(Project No:SSP-9339) ; sponsored by Indo- Gulf Fertilizers, Lucknow contract value: (Rs 11.00 Lakhs) PL Aug 2007 May 2008 Applied
12. Development and characterization of titanium aluminide coatings for Ti based alloys for compressor blade application, under Module-5--CSIR Inter Laboratory Project with AMPRI Bhopal- CSIR Inter Laboratory Project (NWP-0028), contract value: ( Rs 50.00 Lakhs ) PL Aug 2007 July2012 Basic and Applied
13. Failure analysis and RLA study of super heater tubes of 120 MW TPS boiler(Project No: SSP9331); sponsored by Chattisgarh State Electricity Board- Raipur, contract value (Rs 3.92 Lakhs) PL May 2007 Nov 2007 Basic and Applied
14. Assessment of creep rupture and elevated temperature tensile strength of T11, T12 and 15 M03 grades of steel, (Project No-SSP 9352); sponsored by ISMT Pune, contract value (Rs 76.18 Lakhs) PI and co-ordinator June 2007 June 2009 Applied
15. RLA studies of radiant tubes (5 Cr-0.5 Mo) of heater, 31 F1 (Project No: SSP-9315);sponsored by HPCL Mumbai, contract value: (Rs 3.93 Lakhs)
PL Aug 2006 May 2007 Applied
16. Thermomechanical characterization of ceramic coatings for turbine blade material ,(Letter No: SR/S3/ME/30/2005-SERC-Engg).sponsored by Department of Science and Technology (GAP0155); contract value (Rs 21.4321 Lakhs) PL Dec 2006 Nov2009 Basic and Applied
17. RLA of service exposed boiler tubes based on
accelerated creep ruptured tests, from NTPC
Ramagundum and IFFCO Kalol (Project No:
SSP-9309 ; sponsored by TBW, contract value:
( Rs 3.30 Lakhs) PL Dec 2005 Nov 2006 Applied
18. RLA study of 60 MW no- T/3t Titagarh
generating station;(Project no-STS-9273); sponsored
by CESC Ltd, Kolkata; contract value: (Rs 3.50 Lakhs) PL Nov 2005 March 2006 Applied
19. RLA of service exposed boiler tubes of
NTPC Vindyachal (Unit 5 and TNEB), TBW
(Project No: STS-9237) ;sponsored by TBW, contract value: (Rs 3.857 Lakhs) PL July 2004 Jan 2006 Applied
20. Fatigue and creep damage resistance of Ni base superalloys and TBCs for gas turbine application, using standard and miniature samples, Corr-22; TECA(CSIR Net Work Project), contract value: (Rs 79.00 lakhs)
PL April 2004 March 2007 Basic and Applied
21. Metallurgical property and microstructural assessment of first stage turbine blade before and after rejuvination, (SSP-9238); sponsored by NTPC Dibiyapur; contract value: ( Rs 6.85 Lakhs) PL May 2004 Feb 2005 Basic and Applied
22. RLA study of 30 Mw Turbo Generator sets of New Cossipore Generating System,( Project Number- CIEP / 2002 / SSP / 0154) ; sponsored by CESC Ltd,Kolkata, & RLA of end rings of Mulajore power station, CESC Ltd (Project No:CIEP/SSP/2003/9165) and RLA of end rings of Titagarh power station, CESC Ltd, (Project No: CIEP/SSP/2003/9179); sponsored by CESC Ltd, Kolkata; contract value: (Rs 3.50 lakhs) PL Aug 2002 May 2003 Applied
23. Thermo mechanical characterization of Ceramic coatings for combustion chamber Liners / combustion liners,(Project No: GAP0066) ); sponsored by AR&DB, ( contract value Rs 7. 54 Lakhs) PL March 2002 April 2005 Basic and Applied
24. RLA study of 2 X 67.5 MW boilers unit 3 & unit 4 of BALCO captive thermal power plant , NTPC Korba, (Project No: CIEP/TSP/2000/0102); contract value:
( Rs 4.00 Lakhs) PL Nov 2000 May 2001 Applied
25. RLA study for boilers unit-5 and unit-6 (2 X 120 MW) of MPEB, Korea East, (Project No:CIEP/TSP/2000/0098) ; contract value:
( Rs 11.00 Lakhs) PL June2000 Dec 2000 Applied
26. Effects of Elastic Plastic Deformation on Composites of TBCs, (Project No: OLP 16131) PL Nov1999 Oct 2000 In House R&D Project
27. Thermomechanical Modelling in Crack Propagation Studies of Thermal Barrier Coatings (TBCs) in Power plant Application; (Project No: OLP 13231) PL Sept 1998 August 1999 In House R&D Project
28. Thermomechanical Characterization & modelling of ceramic coatings in power plant application; Collaboration under Bilateral Exchange (DLR) Programme with Institut fur Werkstoffe der Energietechnik (IWE-1), Forschungszentrum,D-52425,Juelich , Germany (International S & T Affairs of CSIR)- Project No :IN-283); from the German side PL April 1997 March 1998 Basic and Applied
29. Mechanical Property Evaluation and Life Prediction of Service Exposed D1-FPU Distillation Column and CCU Reactor Materials, Sponsor Specific Category of CIEP with BPCL (Bharat Petroleum Corporation Limited)-Bombay. (Project No.WBP1001); contract value: ( Rs 3.50 Lakhs) PL April 1995 Dec 1996 Applied
30. MC2-Mechanical Properties of Advanced Ceramics (INDO-US project from DST); Sponsored by NBS/NIST, USA,(Project No:113870572); contract value: ( Rs 17.00 Lakhs) PL Dec 1990 Nov 1995 Basic and Applied
31. Failure analysis of service exposed economiser tubes collected from 13 years old boilers,(Project no-SSP-9248); sponsored by IOCL Barauni, contract value: ( Rs 2.00 Lakhs )
PL Feb 2007 March 2007 Basic and Applied
32. RLA study of radiation tubes , ( Project No:
SSP-9256); sponsored by IPCL Vadodara ; contract value:(Rs 2.00 Lakhs) PL March 2005 Nov 2005 Applied and Basic
33. Failure analysis in boiler water piping in Refinery II area, (Project No:CIEP/SSP/9205) ; sponsored by Bongaigaon Refinery and Petrochemicals Ltd, Assam, contract value: ( Rs 1.00 lakh) PL Aug 2004 Dec 2004 Applied
34. Metallurgical investigation on turbine, propeller and torsion shafts used in aero-engines, (Project No: CIEP/2003/TMP 90066);sponsored by AOC, 3BRD, Air Force Chandigarh, contract value: (Rs 1.05 Lakhs) PL Nov 2003 Feb 2004 Basic and Applied
35. RLA of 15 MW TG unit of M /S Usha Beltron Ltd, Jamshedpur, (Project No: CIEP/STS/2003/
9166);sponsored by APT LTD, Hyderabad; contract value: ( Rs 2.50 Lakhs) PL March 2003 May 2003 Applied
36. Health Assessment of Heater tubes ,( Project No:CIEP / 2002 / TSP / 0142);sponsored by IOCL, Gujarat Refinery Vadodara, contract value: (Rs 1.25 Lakhs) PL Oct 2002 April 2003 Basic and Applied
37. Stress Rupture properties of service exposed boiler
tubes, (Project No-SSP 0799); sponsored by CPRI
Nagpur; contract value: (Rs 4.512 Lakhs) Co-PL Feb 2012 Aug 2012 Applied
38. Evaluation of creep strain of SA 335/P91 grade of steel, (Project No: SSP 0735); sponsored by Remi Metal Gujrat, contract value: (Rs 9.486 Lakhs) Co-PL Dec 2011 March 2013 Basic and Applied
39. Evaluation of creep Strength of T11/T22 Grade of
Steel; sponsored by Remi Metal Gujrat; contract
value:(Rs 8.00 Lakhs) Co-PL Jan 2013 Dec 2013 Applied
40. Metallographic studies and accelerated creep rupture properties of service exposed tubes of SA 213 (P91) grade of steel,(Project No-SSP 0799);sponsored by TBW Pune; contract value:( Rs 7.36500 Lakhs) Co-PL Sept 2012 June 2013 Basic and Applied
41. Assessment of stress rupture & mechanical properties
on boiler tubes (Project No:SSP 9385); sponsored by
Central Power Research Institute- Nagpur; contract
value: ( Rs 3. 25316 Lakhs) Co-PL Nov 2008 April 2009 Applied
42. RLA of service exposed RH and PLSH tubes based on
ASR test on Unit #5and Unit#1 boilers of NTPC Vindiyachal,(Project No-STS 9228); sponsored by TBW;
contract value:( Rs2.6275 Lakhs) Co-PL
March 2005 Sept 2005 Basic and Applied
43. Assessment of boiler tubes based on stress rupture tests,(Project No-SSP-9195);sponsored by CPRI; contract value:( Rs 4.15992 Lakhs) Co-PL April 2004 June 2004 Applied
44. Evaluation of mechanical properties of boiler tubes,
(Project No-SSP-9207); sponsored by CPRI; contract value :
(Rs 1.76550 Lakhs) Co-PL Aug 2004 Dec 2004 Basic and Applied
45. Evaluation of creep rupture properties of 316L (N) SS
weld and modified ( Cr-1 Mo VNB alloy & creep
fatigue properties of 316 L( N) base,(Project No-SSP
-9183); sponsored by IGCAR Kalpakkam; contract
value: ( Rs 18 Lakhs ). Co-PL Aug 2003 Sept 2007 Basic and Applied
46. RLA and life extension study of unit-8, 100 MW of ‘A’ TPS, Obra UPSEB;(Project No: CIEP/TSP/0004/2000); sponsored by MECON, contract value: (Rs 6.0 Lakhs) Co-PL Sept 2000 March 2001 Applied
47. RLA study of 2 X 120 MW of boilers unit 3 and 4 of Amarkantak thermal power station, MPEB, (Project No: CIEP/ SSP/2000/0092); sponsored by Ansaldo, Italy and MECON, contract value : (Rs 19 Lakhs) Co-PL April 2000 Oct 2000 Applied
48. Effect of post-weld treatment on hydrogen degradation of spirally welded pipeline steels; (Project No: OLP 6831) Co-PL March 1996 Feb 1997 In House R&D Project
49. Influence of saline environment on the creep rupture life and low cycle fatigue behaviour of Niomic 263 alloy used as a structural material in Kaveri Gas Turbine Engine for marine turbine application, (Project No:SSP 0583); sponsored by Gas Turbine Research Establishment (GTRE) Bangalore, contract value: (Rs 15.61000 Lakhs ) Co-ordinator of creep activities July 2010 March 2011 Basic and Applied
50.Development of high temperature creep resistant
Mg-alloys under Module-1, (Project No:NWP0028);contract value: Rs 50.0 Lakhs) Member May 2008 March 2012 Basic and Applied
51. Advanced joining techniques for high
performance steels including friction stir welding
under Module 3 of Supra Institutional Project ,
(Project No: SIP 0025); contract value:(Rs 5.00 Crores) Member November 2007 October 2012 Basic and Applied
52. Synthesis of silver brazed alloys for metal/ceramic brazing:,(Project No-GAP 0068);sponsored by AR&DB, contract value: (Rs 12.67 Lakhs) Member Sept 2001 Aug 2004 Basic and Applied
53. Evaluation of creep behaviour of Alloy 690 and
693 at 950-1100 oC, ,(Project No: GAP 0179);
sponsored by BNRS; contract value: (Rs 18.38 Lakhs) Member November 2007 December 2010 Basic and Applied
54.Development of rheocast Mg-alloys for application in engineering industries,
(Letter No: SR/S3/ME/008/2007). sponsored by Department of Science and Technology- (Project No: GAP 0189); contract value: Rs 22.00400 Lakhs)
Member April 2008 March 2011 Basic and Applied
55. Assessment of stress rupture & mechanical
properties on boiler tubes, ( Project No: SSP 9480);
sponsored by Central Power Research Institute
- Nagpur; contract value: ( Rs 6. 06181 Lakhs) Member Nov 2008 June 2009 Applied
56. Low temperature sensitization studies on FF 304 LN steel (Project No-SSP/0211) sponsored by BARC Mumbai, contract value: (Rs 20.95 Lakhs) Member Oct 2004 Sept 2010 Basic and Applied
During the tenure of the present grade {Sct. Gr.IV(6)} Dr. Ashok Kumar Ray worked on several projects (list enclosed aboveMany of the projects listed were initiated and led by Dr. Ray. Significant research and development work is being carried out by Dr. Ray in the area of thermal barrier coatings on Ni base superalloys for aero, gas and marine turbine applications, development of titanium aluminide coatings on Ti based alloy for marine and aero turbine application and development of high temperature creep resistant Mg-alloys for power train applications. Some major areas of his research are:
(1). Thermomechanical characterization of ceramic coatings for combustion chamber liners, sponsored by AR&DB
In the global scene, candidate materials for pressurized heat exchangers in coal-fired power plants, heat exchanger tubes used in gas cooled solar plants, turbine blades are made of superalloys with ceramic coatings. These are being evaluated for their life in terms of high temperature mechanical behaviour. Both industry as well as academia are actively pursuing research on evaluating the life and thermomechanical behaviour of these components.
Not much published work exists in this area in our country, India, although enormous market potential exists for ceramic coated superalloys because of the large expansion in the power sector being undertaken presently through indigenous and foreign expertise. It has been felt by central agencies like TIFAC (Technology Information, Forecasting & Assessment Council), under DST that effort should be initiated in this area which has not been reported so far. HAL (Hindusthan Aeronautics Ltd), Bangalore ,was highly appreciative of the proposal and has shown great interest in this collaborative research. HAL Bangalore has confirmed that this study would be of considerable interest to Hindusthan Aeronautics and in particular to gas turbine engines as ceramic coatings have considerable importance in gas turbines and can also have applications for hot end components of advanced power plants. They have also mentioned that theoretical characterization and modeling of ceramic coatings in power plant application as proposed would generate valuable information in this field and hence would be of considerable interest to the industry.
Turbine blade material is a very important component of the gas turbine. Extension of life of the turbine blade material will go a long way in improving the life of equipment and generation efficiency.
‘Ceramic coating by plasma spraying technique on turbine blades is a very complex process’. The parameters involved in plasma spraying process are very critical to attain the desired properties of the product. By controlling the process parameters, one can change the bonded layer between the coating and the substrate, the thickness of the layer coated etc.
Thermal barrier coatings (TBCs) by plasma spraying technique on turbine blades are now being planned to be produced in the country. Very soon, no turbine blade will be used without a coating, because of its ability to withstand high temperature and retain the desired thermomechanical properties. For this purpose, plasma spray coating techniques have been developed and stabilized in the west. Learning this technology will help to assist all the indigenous turbine blade manufacturers to incorporate ceramic coating technology for input into gas turbines.
This project endeavours to understand the behaviour of thermal barrier coatings ( 8 wt% yttria stabilised zirconia) on Superni C263 alloy, with varying plasma sprayed parameters, when exposed to monotonically increasing and high cyclic stresses at high temperatures. This Ni base superalloy is the candidate material for gas turbine combustion chamber. While the microstructural aspects of coating-substrate interface has been well studied, the thermomechanical performance of the bond is still largely unknown. Characterization of the ductile to brittle transition temperature for the bond coat from high temperature tensile tests, high cycle fatigue test of the bond - substrate interface, and accelerated creep tests, of the coated specimens was therefore important from this project. The experiments were accompanied by study of the failure mechanisms in the bond coat [52,53,55,59,68]. For assessing the failure mode and behaviour of the coating, extensive fractographic studies using SEM were conducted on the fractured specimens. The experimental work was further useful in validating a broader mathematical modeling and computer simulation work on the thermal barrier coated Ni based superalloy (Superni C263). Stress analysis of the bond coat were carried] out [52,53,55,59,63,69] by analytical/numerical method. Reliable life prediction of the coating under any arbitrary stress temperature conditions were looked at by simulating experimental stress- rupture data. Curve fitting technique was developed for extrapolation based on experimental data obtained from the laboratory. It appears that the increase in endurance limit [31,38,41,53]for the TBC as bond coated superalloy is due to shifting of load to the bond coat. Interdiffusion of Al from the coating to the substrate and the premature failure for these two materials are possibly due to high stress crack imitation/growth in the TBC/bond coat layers Al from the coating to the substrate and the premature failure for these two materials are possibly due to high stress crack imitation/growth in the TBC/bond coat layers. Oxidation is also the cause of the reduced life of the bare substrate as compared to the coated substrate while fatigue and creep tests [38,41,53,54,59,62] are carried out in an oxidizing environment. Unlike in fatigue, the mode of fracture in the substrate at very high creep stress was transgranular whereas that at low stress was intergranular. Delamination of bond coat, oxidation of the substrate and spallation of the ceramic layer were evident at very high fatigue and creep stresses. Spallation of top layer at low creep stress was due to a continuous growth of alumina scale at the top coat (TBC) / bond coat interface. Possibly during creep, coarsening of the grains and the ’precipitates and also the decomposition of carbides at the grain boundaries of the bare substrate gradually degrade the properties of the alloy when exposed to elevated temperatures for extended periods of time [31,52,53] .
(2). Fatigue and creep damage resistance of Ni base super alloys and TBCs for gas turbine application, using standard and miniature samples, Corr-22; TECA(CSIR NetWork Project.
Ni base superalloys are candidate materials for gas turbine combustion chamber, blades and vanes. While the microstructural aspects of these alloys has been well studied, the thermo-mechanical performance of the same and that of the bond is still largely unknown. High temperature high cycle fatigue resistance of the superalloys , bond - substrate interface and accelerated creep tests at 800-900 oC, of the coated specimens as well as that of the substrate were therefore important for this project. The experiments were carried out to study the failure mechanisms in the bond coat. For assessing the failure mode and behaviour of the bond coat as well as that of the substrate, extensive fractographic studies using SEM were conducted on the fractured specimens. Creep as well as high cycle high temperature fatigue properties [53,55] of some of these alloys (Udimet 520 and AE 437A) were evaluated using miniature size specimens also [31,38,41,53,54,59,62].
(3). Thermomechanical characterization of ceramic coatings for turbine blade material, sponsored by DST
This work deals with evaluation of lifetime of a thick thermal barrier coated AE-437A Ni base superalloy mostly employed for manufacturing compressor and stationary stator blades in aero turbines from accelerated creep tests. Severe high temperature oxidation is likely the cause of the reduced lifetime of the bare substrate while accelerated creep experiments are carried out in an oxidizing environment. The bond coat was capable of supporting some load and the apparent equivalence of 800 oC stress rupture properties of thickly and thinly coated AE 437 A was not anticipated since the thick TBC coating with its 160 micron bond coat represents an ~20 % interface, and accelerated creep tests, of the coated specimens was therefore important from this project [19,20,21]. The experiments were accompanied by study of the failure mechanisms in the bond coat. For increase in cross sectional area for a 3 by 4 mm sample; whereas thin TBC with a 100 micron bond coat has a ~12 % increase in cross section for the same initial sample size [20]. Delamination of topcoat layer and bond coat from the substrate occurred at very high creep stress, whereas delamination of TBC from the bond coat was evident at intermediate creep stress level. It was found that furnace thermal cycling (10 to 50, 1 –hour thermal cycles) on the TBC samples [13,14,20] prior to creep loading at 70 MPa/800oC, drastically reduces the lifetime or rupture life of the TBCs. The damage generated by this micro cracking is expected to be a primary life-limiting factor. Analytical/numerical method was used to calculate the stress in the bond coat.
(4). RLA study and failure analysis of service exposed primary reformer tubes, sponsored by Indo-Gulf Fertilizers
The reformer is an important process equipment used in the production of ammonia. This ammonia is consequently utilized, for the production of nitrogenous fertilizers. The reformer is a major consumer of energy and the efficiency of the reformer section has a major bearing on the over-all energy consumption of a fertilizer plant. Hence, the process of reforming and the equipment used for reforming, needs priority attention in a fertilizer plant. The efficient design and operation of the reformer is a must, for achieving energy efficiency in an ammonia plant. For efficient operation of the reformer, the aspects needed to be considered are: utilization of micro-alloys (conventionally, the HK 40 or IN 519 or equivalent material were being used) for the reformer tubes, operation of the reformer at higher pressure, utilization of a superior catalyst, active at low steam-C mole ratio, operation of the reformer at low S/C ratio, installation of waste heat recovery systems for reformer exhausts, to pre-heat combustion air, natural gas and boiler feed water, installation of a pre –reformer. The Indian fertilizer industry should strongly consider incorporation of these aspects in their plants to reduce their energy consumption and benefit.
Nitrogenous fertilisers use ammonia as the basic material for providing the nitrogen component. Ammonia is synthesized by chemically combining hydrogen and nitrogen under pressure, in the presence of a catalyst. The hydrogen requirement is met by, catalytically reacting a mixture of steam and hydro-carbons, at an elevated temperature to form a mixture of hydrogen and oxides of carbon.
CnHm+ nH2O =nCO + (m/2 + n)H2
CO + H2O= CO2 + H2
The first reaction is called the reforming reaction which takes place within the primary reformer tube .This is a highly endothermic reaction, and the number of moles of the product exceeds, then umber of moles of reactants. So the reaction goes to completion at high temperature and low pressure.
Life extension study of twelve years service exposed primary reformer tubes is very important as these tubes operate at very high temperature and aggressive environment. The decision for retiring a component is not purely technical but also one of economy and safety [7,10,72]. Utilization of appropriate inspection during plant shut down, in combination with high temperature mechanical properties, microstructural analysis and judicious accelerated creep provided an effective strategy for short term assessment of 11 years service exposed reformer tube integrity. Barring development of corrosion cracks and decarburization of the inner and outer walls of the tube, the microstructure of the service-exposed alloy was free from any signs of deterioration like creep cavitation or voids, and the hardness was within the expected ranges; however, tensile testing revealed an apparent loss of strength from 25 oC to 900oC. Accelerated 900-980oC stress rupture testing of samples machined from 11 year at 950 oC and 19 MPa exposed KHR 35 CT reformer steel tubing, did not reveal any degradation of rupture behaviour compared to that of the virgin alloy. An additional life of at least 32822 h is predicted at the operating stress - temperature conditions. Another check for safety of the service exposed tubes in terms of residual life is recommended to be carried out after expiry of two years of service life from the view of economical and safety reasons. Also during shut down of the plant, NDT (nondestructive) tests viz. dimensional (thickness and diameter) measurement, hardness measurement and in-situ metallography may be carried out to
assess the condition of the materials for their future serviceability based on the destructive tests, the service exposed tube can be in service for three and a half years. Another health check is required after two years during plant shut down [7,10].
(5). INDO-US project through DST- (MC2) Mechanical properties of advanced ceramics (Dec 1990-Nov 1995) on “A New Technique for Precracking Ceramic Specimens in Fatigue and Fracture”
This work highlights the design and performance of an articulated bridge fixture to precrack ceramic specimens with 100% success. This was the first time in our country that we were able to generate and monitor fatigue cracks in ceramics.The precracked specimens were subsequently used to determine and study the fatigue crack growth rate and fracture toughness of a 25 wt% SiC whisker reinforced Al2O3 composite. Precracking was initially done by using Vickers indentation, as a cracker starter. However one can argue that the residual stress introduced due to the indentation might influence the fracture toughness and fatigue crack growth rate values determined subsequently. The success achieved in precracking by using this fixture led us to substitute the vickers indentation with a 0.1 mm deep groove as a crack starter. The fracture toughness values obtained from V notched and precracked specimens were about 7.2% lower than those obtained from indentation as a crack starter in indented and precracked specimens. However,
fatigue crack growth rates using both these crack starters were not widely different [91,92,96,97,98,99,101].
(6).Thermomechanical modelling in crack propagation studies of thermal barrier coatings (TBCs) in power plant application
This work is aimed at developing analytical models for predicting bond coat properties during crack propagation studies under bending on thermal barrier coatings (TBCs) and to reveal the stress distribution pattern along the directions of global axes and the equivalent stress for all types of specimens used in the present investigation. Crack propagation studies were performed with plasma spray coated zirconia, bonded by a MCrAlY layer to Ni -base superalloys (Inconel 617 & CMSX-4). Such thermal barrier composites are currently considered as candidate materials for advanced stationary gas turbine components. Coating as a protective layer improves the surface properties of the substrate. At a temperature of 800oC, the crack propagation was found to be confined to the TBC (ceramic layer), as the ductile bond coat offers an attractive sink for stress relaxation. The stress-strain behaviour is a function of the elastic modulus of coating, bond coat as well as that of substrate. Thus, the elastic modulus of the bond coat needs to be evaluated which is a basic parameter for characterising coating performance . In this paper, the elastic modulus of the bond coat has been determined by modifying the existing model for two - layered composite beam specimen to a three layered composite beam specimen. FEM (finite element) analysis for all types of tested specimens was conducted with ANSYS software using a 2-D isoparametric solid element, defined by four nodal points having two degrees of freedom at each node. Simulations were carried out all specimens with selected load conditions in the elastic region of the stress-strain curves.. The outputs of the stresses along the direction of global axes i.e. x, y (component stresses), the shear stress xy, the principal stresses 1, 2, 3 and the equivalent stress, eq have been found out. The analytical model developed for the three layered composite beam was successful in predicting the E value of the bond coat both at room temperature as well as at high temperature . These E values obtained were compatible with those reported in literature [63,79,81,82,85,91].
(7). Effects of elastic plastic deformation on composites of TBCs
The present work highlights some of the results on modeling of deformation behaviour in elastic plastic condition under bending, for miniature test specimens of thermal barrier coatings (TBCs) on Ni base superalloys. The experimental data was then simulated mathematically using beam elements in Finite Element Analysis. A computer code was developed considering elastic - plastic finite elements, for four point bend
specimens with two degrees of freedom at each node. A similar analysis was also conducted using the ANSYS (version 5.5) software. The analysis indicated concurrence of displacements, for each load case, with the experimental results in the elastic regime. Reasonable extent of concurrence was also obtained in the early stages of plastic deformation of elements. However, minor deviations occurred from experimental results in the case of large loads i.e. large plastic deformation [63].
(8). Structure property correlation study of a service exposed first stage turbine blade in a power plant ( sponsored by NTPC)
This work deals with assessment of high temperature force controlled fatigue and creep properties of as received and 31,325 engine operating hours service exposed first row gas turbine blade in a power plant. The mechanical properties were evaluated from various regions, namely root portion (bottom portion), middle region or the airfoil region and the top region of the blade. The root portion showed superior fatigue and creep properties compared to the aerofoil region of the blade where the temperature distribution is maximum and the top or tip region which is considerably narrow and brittle. The microstructural assessment of as received service exposed gas turbine blade of first row of gas turbine have been interpreted, which is required for developing process & technology for rejuvenation of turbine blades. The mechanical properties of each region were correlated with its corresponding microstructural characteristics. The blade is made of nickel base superalloy Udimet-520. Significant coarsening of ’ precipitates in hot zones, e.g., root and mid sections, as compared to the base microstructure of below platform region was observed. The coarsening occurred in the aerofoil region and was maximum in the top region of the blade.The originally thin and nearly continuous distribution of grain boundary carbide precipitates became discontinuous with little increase in size in the root section whereas it changed to thick continuous precipitationenveloped by ' phase in mid section. Grain boundary cavitations are not observed. In addition, the usual distribution of intragranular MC carbide precipitates in below platform section is nearly dissolved in mid section while smaller size is observed in bottom or root section. But the blocky MC precipitates at grain boundaries or close to grain boundaries are degenerated into needle shaped sigma phase in the mid and top sections. Formation of intragranular Cr- rich sigma phase is also observed in root, airfoil and top sections but their frequency of occurrence is more in mid & top sections than the root section. The appearance of sigma phase also signals for the rejuvenation. All the grain boundaries in mid section and top section show enveloping of M23C6 grain boundary precipitates with ’ phase, because of following transformation at grain boundaries: MC + M23C6 + ' (' envelopes the M23C6). The remnant coating at root section is 100-120 m. In mid section it is about 10 m with base metal attack down to 20 m. In addition, the width of TCP phase formation zone in subsurface region of base metal is about 200 m in mid section while it is about 100 m in root section. Compared to the root and below platform sections of the virgin material the service exposed blade revealed MC intragranular precipitation in below platform, dissolution of intragranular MC precipitates and coarsening of grain boundary precipitates in the root section respectively[51,62] .
(9). INDO-GERMAN collaboration under DLR programme with the Institut fur Werkstoffe der Energietechnik (IWE-1), Forschungszentrum, D-52425,Juelich , under Bilateral Exchange Programme (International S & T Affairs of CSIR)- Pr. No IN-283 from the German side
Crack propagation studies under bending are were performed with plasma sprayed zirconia bonded by a MCrAlY layer to Ni -base superalloys (Inconel-617 and CMSX-4.). Such thermal barrier composites are currently considered as candidate materials for advanced stationary gas turbine components. The crack propagation behaviour of the ceramic thermal barrier coatings (TBCs) at room temperature , in as received and oxidised conditions reveals that cracks grow linearly in the TBC with increase in bending load till about the yield point of the superalloy is reached. Approaching the interface between the ceramic layer and the bond coat, a high threshold load is required to propagate the crack further into the bond coat. Once the threshold is surpassed, the crack grows rapidly into the brittle bond coat without an appreciable increase in the load. At a temperature of 800oC, the crack is found to propagate only in the TBC (ceramic layer), as the ductile bond coat offers an attractive sink for stress relaxation. Effects of bond coat oxidation on crack propagation in the interface regime have been extensively studied [63,79,81,82,85,91].
(10). Development and characterization of titanium alumide coatings for Ti based alloys for compressor blade (CSIR Inter Laboratory Project with AMPRI Bhopal and DMRL Hyderabad)
Titanium base alloys are candidate materials for compressor blades in aero engines.High temperature oxidation resistance coatings on titanium base alloys enhance the performance of aero engines operating in hostile environments. Both industry as well as academia is actively pursuing research on evaluating the effect of ceramic coating on low cycle and high cycle fatigue behaviour of titanium alloys [5,6,9]. Presently, titanium aluminide coated titanium base alloy grade IMI 834 is considered to be the candidate material for compressor blades in aero turbines for Kaveri Engine Project . The microstructural aspects of coating-substrate interface have been well studied. However, the fatigue performance of the coating-substrate interface is largely unknown.
The present project endeavours to understand the low cycle and high cycle fatigue behaviour of titanium aluminide coating on titanium base alloy grade IMI 834 at 600 oC. This temperature is chosen as it corresponds to the temperature of the compressed air in the last stage of the compressor disc just before entering into the combustion chamber. Total strain amplitude as well as stress controlled fatigue test of titanium aluminide coated alloy grade IMI 834 is conducted for this study. The substrate is solutionized at 1030±5oC for 2 hours and oil quenched followed by ageing at 700±5oC for 2 hours and air cooled. The coating consists of Al2Ti phase and has a thickness of about 50 µm. Microstructure of alloy grade IMI 834 in as-received and heat treated condition revealed primary alpha in transformed beta matrix. The volume fraction of primary alpha is 15%. Total strain amplitude controlled low cycle fatigue (LCF) tests were conducted at t/2 values 7.5x10-3, 9.0x10-3, 1.0x10-2 and 1.2x10-2 on bare and titanium aluminide coated alloy grade IMI 834. The LCF behaviour of titanium alloy IMI 834 was comparatively studied in bare condition and with titanium aluminide (Al2Ti) coating, at 600oC in air, for compressor disc of aero engines. Results revealed that at higher values of total strain amplitudes Al2Ti coated IMI 834 alloy has longer fatigue life (Nf) as compared to the bare IMI 834 alloy which appears to be due to load shifting to the coat, but at lower values of t/2, Al2Ti coating on IMI 834 alloy seems to have no effect on Nf. Higher values of cyclic strength coefficient (K') and cyclic hardening exponent (n') for coated IMI 834 alloy indicate that coating offers resistance to cyclic plastic deformation at 600oC in air, and hence is beneficial. The coating adheres well to the substrate and is also fairly resistant to high temperature corrosion in sea water atmosphere at 600oC. Corrosion resistance tests were performed in sea water atmosphere at 600oC to investigate if the coated alloy could be used in marine gas turbine application too. The LCF tested samples were examined under SEM for understanding the fatigue failure mechanisms. The coating-substrate interface of the fatigue failed samples are being examined under scanning electron microscope to know the failure mechanisms. It is expected that these results will provide a fundamental understanding of the influence of coating on the fatigue behaviour and this will lead to the development of more accurate life prediction models for coated substrate. The experimental work would further be useful in validating a broader mathematical modeling and computer simulation work for the titanium aluminde coated Ti base alloy [5,6,9].
(11) Development of high temperature creep resistant Mg-alloys (CSIR Inter Laboratory Project with AMPRI Bhopal )
Magnesium alloys have wide applications in automobiles due to their advantages such as low-density, high-strength to weight ratio, high specific toughness and environmentally friendly. It is expected that the
established trend in weight reduction will continue to see magnesium alloys make further penetration into power train applications. As far as some applications such as transmission housings and crank cases are concerned, the exacting criteria are placed on the elevated-temperature (≥ 150oC) mechanical properties and creep resistance in particular. In literature, it is found that AZ91 alloy delivers poor high temperature properties. The major reason for the poor creep strength of AZ91 alloy is the microstructural degradation that takes place at elevated temperature. As far as AZ91 alloy is concerned, the principal room temperature strengthening element is Mg17Al12 intermetallics. By virtue of containing low melting point of this intermetallics (437oC) and has higher diffusivity in Mg matrix, this coarsens at a faster rate and unstable at higher temperatures i.e. above 120oC and no longer acts as a barrier for dislocations. Further, Mg17Al12 has a cubic crystal structure due to which it is incoherent with the hcp magnesium matrix. Therefore, presence of this phase leads to poor elevated temperature properties. Mg-Sn based alloys have attracted a renewed interest for their potential for application at elevated temperatures. The intermetallic phase Mg2Sn in Mg-Sn alloys has a much higher melting point (770oC) than that of the Mg17Al12 phase (437oC) in Mg-Al alloys. Mg-Sn based alloys are therefore likely to be more creep resistant at elevated temperatures than Mg-Al based alloys. Researchers have studied on compressive creep behavior of Mg-Sn alloys. An attempt has been made to investigate the tensile creep behavior of Mg-8Sn-3Al-1Si (TAS 831 alloy) for enhancement in creep properties compared to those of Mg-8 Sn alloy.
This work highlights the trends recently observed while evaluating the conventional creep behaviour of Mg-8%Sn and Mg-8%Sn-3%Al-1%Si alloys at 150oC and at four stress levels. The improvement in creep properties obtained in Mg-Sn based alloys is attributed to the presence of thermally stable intermetallics as compared to the AZ-series Mg-alloys. The results revealed that between the two alloys, the creep resistance of Mg-8%Sn-3%Al-1%Si alloy is superior to Mg-8%Sn alloy owing to the presence of Mg2Si intermetallic which retards the grain boundary movement during creep. However, the ductility of the former alloy is lower than that of the later. It is also evident that the creep life and the creep resistance of all the alloys significantly reduce with increase in applied stress [4].
(12) Damage assessment of service exposed reactor and distillation column materials of petrochemical industries
This work highlights quantification of normalized creep damage incorporating uncertainty with respect to Larson–Miller parameter (LMP) at various intervals (with service exposure) of a 55 years service exposed reactor and distillation column materials of petrochemical industry [3]. Usually, remaining life is predicted from extrapolation of stress vs. LMP plot with- out incorporating the uncertainty involved in calculation of LMP values. Uncertainty involved in calculating LMP value has been given prime importance in this work because it is a function of rupture time. Variability of normalized creep damage for reactor and column materials is well approximated with the aid of Weibull distribution. As expected, it is observed that the distributions shift towards the higher range of damage with increase in service exposure time. Monte Carlo simulation has been carried out to predict remaining life with 99% confidence interval.Based on accelerated creep rupture test CCU reactor and FPU column materials have balance life of 2.4 and 4.78 years respectively. Future work would be aimed at adding more scientific value to the work by carrying out large number of experiments to perform advance statistical analysis and uncertainty measurement of real versus expected lives, and reasons for discrepancies, particularities of metallurgy and chemistry and their effect on life, how well design criteria were met by real service conditions, possible ways to increase residual life in this or similar components, improvements to testing methods or devices [3,87,94,95]etc.
(13) Influence of Saline Environment on the creep rupture life and low cycle fatigue behaviour of Superalloy Nimonic- 263 used as a structural material in Kaveri Gas Turbine Engine for marine turbine application sponsored by GTRE (Gas Turbine Research Establishment) Bangalore.
Surfaces of superalloys in marine gas turbine components for various energy conversion systems are generally covered with a mixture of salt such as Na2 SO4 and NaCl during its exposure in saline environment. Condensation of such salt mixture is responsible for severe oxidation and hot corrosion of the material which considerably reduces in design creep life of the high temperature components of the marine gas turbine. Some important ways by which hot corrosion lowers the design creep life of the materials are by reduction of the load-bearing cross sectional area, production of crack on the surface of the material and its rapid propagation and production of voids at the grain boundaries by outward diffusion of metal ions. Variation in the salt composition, also affect the creep life of the materials at different level as different salts are having different degree of severely to corrode. Therefore, in actual service conditions, the material will experience both hot corrosion and creep simultaneously .
The present work highlights the effect of Na2SO4 and NaCl salt mixture on creep rupture properties of Nimonic-263 alloy at 800 and 850oC. Results revealed that for short duration tests, the rupture life is not much affected by the corrosive action of the salt mixture at both the temperatures. Whereas for long term creep tests, salt mixture affects the creep rupture properties of the material catastrophically [2]. Minimum creep rate increases marginally for salt deposited sample compared to the bare alloy. Influence of hot corrosion effect of the salt mixture on the Nimonic-263 becomes effective only after certain period of time. Total creep strain for salt deposited sample is considerably less than that of bare sample. Fractographic features of the ruptured salt deposited and bare samples have been examined.Mode of fracture of salt deposited crept sample is mixed in nature [2]. But, Mode of fracture of bare crept sample is predominantly ductile in nature. In the second phase of the project, the influence of hot corrosion on low cycle fatigue behavior was also studied by conducting fatigue tests at 800 °C in air on bare and salt-coated (90%Na2SO4 + 10%NaCl) specimens. This was followed by extensive scanning electron microscopic (SEM) examinations. Significant reduction in fatigue life is observed across all values of Δεt/2 for the salt-coated specimens in comparison with bare specimens. SEM examination reveals that the fused salt mixture sporadically removes the protective chromium oxide layer and exposes the substrate. Subsequent SEM analysis reveals that severe grain boundary oxidation leads to grain boundary cracking and provides numerous sites for fatigue crack nucleation and growth.
(14)*The other notable projects are mostly from various power plants, Dr. Ray has supervised and conducted various RLA (Remaining Life Assessment) projects at site in Thermal Power Plants.
The total installed capacity of the country has crossed two 200 giga watt, with a record capacity addition of 54,964 mw in the 11th plan -- about two and half times the capacity added in the 10th plan. Commensurate with our country's growth challenges, NTPC has embarked upon an ambitious plan to attain a total installed capacity of 75,000 MW by 2017.
Power plant components have finite life because of prolonged exposure to high temperatures, stresses and aggressive environments. Remaining life assessment of aged power plant components in the present highly competitive industrial scene has become necessary both for economic and safety reasons as most of the power plants are over 25 years old. In real life situations both premature retirement and life extension in relation to the original design life can be encountered. The consequence of failure of a component in-use can be tragic and expensive. There are many cases of engineering disasters resulting in loss of life and property. For boiler components utmost attention is a must to ensure that such incidents can not take place. Carbon and Cr-Mo steels are extensively used as high temperature components in power plants. Even though most of these components have a specific design life of 20 years, past experience has shown that they can have significant remaining life beyond the original design specification. This is best estimated by conducting systematic life assessment exercises during a planned shutdown. In most cases damage accumulation starts from the outer surface as surface cracks. Therefore careful visual examination and non-destructive tests (e.g. dye penetration tests, magnetic particle inspection, etc.) carried out on the outer surfaces can give some idea about the health of the component. In addition the use of ultrasonic flaw detectors can potentially detect nucleation of defects within the material. In view of the increasing cost of setting up a new power generation plants, considerable interest in life extension of the existing units exists. In order to arrive at a quantitative estimate of the remaining life of such ageing components, it is necessary to have creep and stress rupture data, as non-destructive test results cannot predict the future creep life and creep deformation behaviour of the service-exposed tubes. In common practice, in the absence of discernible damage, stress rupture tests can be selectively used to assess the condition of current components. One of the most widely used techniques for life assessment of components involves removal of service exposed alloy and conducting accelerated tests at temperatures above the service temperature An estimate of the remaining life at the operating hoop stress and temperature is then made by analysis creep rupture data using Larson –Miller Parameter.These tests were conducted in the creep laboratory at CSIR-National Metallurgical Laboratory, Jamshedpur [22,29,30,32,33,39,40,51,58,70-78,80,83,84,87-90].
(15) Damage assessment and evaluation of creep behavior of Niobium alloys in controlled environment- BARC project proposal, under review
Compare to other refractory metals, niobium alloys has high melting point, good corrosion resistance against liquid lithium and low density. This alloy is of interest to raise the temperature capabilities of nuclear power plants.
Till date literature search reports that creep of Nb 1% Zr has been carried out up to the temperature 1200 oC. But, it appears from literature that there is almost no creep data available above 1200 oC in inert gas atmosphere for both Nb–1 %Zr or Nb–1%Zr–0.1C alloy. The aim of the present investigation is to study the creep behavior of Nb–1%Zr alloy in high purity argon atmosphere till and above 1100 oC.
Commercial Nb alloys are relatively low-strength compared to other refractory metals. But they are extremely ductile and can be fabricated into very complex shapes. Even though niobium alloys have useful strength compare to nickel-base super alloys, their use has been limited by oxidation and long-term creep behavior. The objective of the present work is to evaluate the creep behavior of the niobium alloy (1Nb-1%Zr) in high purity argon atmosphere at elevated temperatures (900, 1000 & 1100 oC) at three stress levels each; in-house up gradation of existing creep testing machines (at CSIR-NML) for inert gas purging to reduce the cost of machine and experimental set up; also study if any oxidation has occurred. In addition, creep tests will be carried out in high purity argon atmosphere above 1100 oC in the second phase.
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The numbers of square brackets refer to the publication numbers of Dr. Ray as they appear in List of Publications
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| Specialization: |
creep, fatigue & fracture, thermal barrier coatings, Titanium aluminde coatings etc |
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| Patents/ Copyrights: |
1. Ref. No:CR-0081/2013
Title: A software for simulation of creep damage assessment (CDASim)
Authors: N.Roy, S.Bagui and A.K.Ray
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| Publications: |
In Journals: 108 (4 in press)
In Referred Conference Proceedings:14
Total: 122
Number of citations till date: 374
Conference Presentations: 53
1. N. Roy, S. Bagui, J. K. Sahu and A.K. Ray Creep characterization and damage assessment of long term service
exposed P-22 grade of steel, Materials Science and Engineering-A, 560 (2013) 802-810
2. S. Bagui, A. K .Ray, J. K. Sahu,
N. Parida, J .Swaminathan, M. Tamilselvi and S .L .Mannan Influence of saline environment on the creep rupture life of Niomic 263 alloy used in marine turbine, Materials Science and Engineering-A , 566 (2013)54-60
3. Nilima Roy, Krishna Guguloth, Sumanta Bagui,Yogendra Nath Tiwary and Ashok Kumar Ray
Damage assessment of service exposed reactor and distillation column materials of a petrochemical industry, Engineering Failure Analysis, 28 (2013)
289-301
4. P.Poddar, K.L. Sahoo, S. Mukherjee and A.K. Ray, Creep properties of Mg based alloys in automotive industries , Materials Science and Engineering-A, 545 (2012) 103-110
5. J.K.Sahu,K.K.Sahu
and A.K. Ray, The influence of high temperature oxidation resistant titanium aluminide coating on low cycle fatigue behaviour of titanium alloy IMI 834 at 600oC, Journal of Materials: Design and Applications ,
226(1)(2012)34-41
6. A.K. Ray and P.K. Roy,
High cycle fatigue and cyclic
plastic deformation behaviour of high temperature oxidation resistant
titanium aluminide coated IMI 834
alloy at 873 K, High Temperature Materials and Processes,31(6) (2012) 691–699
7. G.Krishna, J.Swaminathan, S. Bagui, A. K. Ray
Remnant life assessment and microstructural studies of thirteen and a half year service exposed primary reformer catalytic tubes of an ammonia plant, High Temperature Materials and Processes ,31(6) (2012) 759–767
8. J.K. Sahu, S. Sivaprasad, J. Swaminathan, A.K. Ray, s.Tarafder and N. Parida, Integrity assessment of engineering components, Science and Culture, 78(11-12) (2012)517-523
9. J.K. Sahu, D.K. Das.,
T.K. Nandy, D. Mandal,
V. Rajinikanth J. Swaminathan
and A.K. Ray, Effect of titanium aluminide coating on cyclic plastic deformation and fatigue life of titanium alloy IMI 834 at 600oC, Materials Science and Engineering-A , 530 (2011) 664-668
10. Ashok Kumar Ray, Sudheer Kumar , Guguloth Krishna, Manoj Gunjan and Samir Chandra Bose, Microstructural studies and remnant life assessment of eleven years service exposed reformer tube, Materials Science and Engineering-A, 529 (2011) 102– 112
11. A.K. Ray, Y.N. Tiwari, G. Das, M. Gunjan ,S.C. Bose and R.N. Ghosh, Health Assessment of twenty two years service exposed radiant tube from an oil refinery, Engineering Failure Analysis , 18 (2011) 1067-1075
12. Ashok Kumar Ray, Bangsidhar Goswami, Yogendra Nath Tiwary, Hemant Kumar Das, Deepak. Kumar Das and Sashi Bhusan Kumar, Fatigue and creep damage resistance of a thermal barrier coated superalloy for combustor liners in aero turbines, Trans Indian Institute of Metals, 63 (2-3)(2010)485-491
13. A.K.Ray, S.C.Bose, P.K.De and D.K. Das, Lifetime evaluation of a thick thermal barrier coated superalloy used in turbine blade, Materials Science and Engineering-A, 527(21-22) (2010) 5474-5483
14. A.K. Ray, S.C.Bose, P.K.De, H.K.Das,D. Mandal, M.Z.Alam, V.S.R.A. Sharma and D.K. Das, Evaluation of lifetime and effect of furnace thermal cycling on stress rupture behavior of a thermal barrier coated superalloy used in turbine blade, Canadian Metallurgy Quarterly, 49 (2) (2010) 191-204
15. Goutam Das, Mousumi Das, Sabita Ghosh, Paritosh Dubey, and Ashok Kumar Ray, Effect of ageing on mechanical properties of 6063 Al alloy using ball indentation technique,
Materials Science and Engineering-A 527 (6) (2010) 1590-1594
16. B. Goswami and A.K. Ray Emerging trends in alternate processing and weather effects of process of Al-Li-X alloys, J. Met and Mater Sc 52(3)(2010)187-208
17. B. Goswami and A.K. Ray Emerging trends in joining process of Al-Li-X alloys, J. Met and Mater Sc 52 (2) (2010) 109-128
18. B. Goswami and A.K. Ray Emerging trends in precipitation phenomenon of Al-Li-X alloys, J. Met and Mater Sc 52(1)(2010)19-45
19. Ashok Kumar Ray, Nilima Roy, Abhijit Kar, Ajoy Kumar Ray, Samir Chandra Bose, Gautam Das, Jitendra Kumar Sahu, Dipak Kumar Das, B. Venkataraman and Srikanth V. Joshi, Mechanical property and characterization of a NiCoCrAlY type metallic bond coat used in turbine blade, Materials Science and Engineering A 505(1-2) (2009) 96-104
20. A.K.Ray and J.D.Whittenberger, Stress rupture behavior of a thermal barrier coated AE 437A Ni-based superalloy used for aero turbine blades, Materials Science and Engineering A 509(1-2) (2009)111-114
21. A.K. Ray, G.Krishna, J.Swaminathan, S.C. Bose, N. Roy, Y.N. Tiwari, P.K.Roy, Z.Alam,V.S.R.A. Sharma, S.V. Joshi, B. Venkatraman, and D.K. Das, Damage resistance of a thermal barrier coated superalloy used in aero turbine blade under accelerated creep condition, High Temperature Materials and Processes 28 (1-2) (2009) 35-53
22. G.Das,M.Das,S.Sinha,K.K.Gupta, S.Chakrabarty, and A.K. Ray, Characterization of cast stainless steel weld pools by using ball indentation technique, Materials Science and EngineeringA 513-514(2009)389-393
23. B.Goswami and A.K.Ray Perspectives of sensor alloys in nickel base systems, J. Met and Mater Sci, 51 (1) (2009) 1-20
24. B.Goswami and A.K.Ray Perspectives of shape memory surgical alloys in nickel base systems, J. Met and Mater Sci, 51 (2) (2009) 77-89
25. B.Goswami and A.K.Ray Emerging trends in mechanical properties of Al-Li-X alloys, J. Met and Mater Sci, 51 (3) (2009) 149-173
26. B.Goswami and A.K.Ray Recent bio-medical alloys in cobalt base systems, J. Met and Mater Sci, 51 (4) (2009) 233-246
27. B. Goswami and A.K. Ray, Perspectives of nanocrystalline materials and metallic glass in pure nickel and nickel base alloys, J. Met and Mater Sci 50 (4) (2008) 195-217
28. A.K. Ray, B. Goswami, S.B. Kumar and S.K. Sahay, Damage assessment and life prediction of TBC systems, J. Met and Mater Sci, 50 (3) (2008) 127-150
29. Samir Chandra Bose, Kulvir Singh ,Ashok Kumar Ray and Rabindra Nath Ghosh, Effect of Thermal Ageing on Mechanical Properties and Microstructures of a Standard G-X 12 CrMoVWNbN 1011 Grade of Cast Steel for Turbine Casing, Materials Science and Engineering A, 476(1-2) (2008), 257-266.
30. A.K. Ray, K. Diwakar , J.K. Sahu, H.K. Das , N. Roy and R. N. Ghosh,
Creep behaviour and stress analysis of seventeen years service exposed primary superheater tube in a thermal power plant, Canadian Metallurgy Quarterly 47 (4) (2008)469-478
31. A. K. Ray, B. Goswami , S.B. Kumar, A. Sharma and D.K,.Das, The influence of alumina scale growth on fatigue resistance of a thermal barrier coated superalloy, Canadian Metallurgy Quarterly, 47(1)(2008) 99-110
32. J.N.Mohapatra, A.K.Ray, J.Swaminathan, A.Mitra,
Creep behaviour study of virgin and service exposed 5Cr-0.5Mo steel using magnetic Barkhausen emissions technique, J. of Magnetism and magnetic materials 320 (2008) 2284-2290
33. Ashok Kumar Ray, Kumar Diwakar, Jitendra Kumar Sahu, Hemant KumarDas ,Nilima Roy, and Rabindra Nath Ghosh, Stress analysis and creep behavior of service exposed primary superheater tube in a thermal power plant, High Temperature Materials and Processes , 27 (2) (2008) 79-89
34. Avijit Kar, Mainak Ghosh, Ashok Kumar Ray and Ajoy Kumar Ray, Effect on interfacial thickness on the mechanical properties of alumina-steel braze joint interface., Materials Science and Engineering A 498(1-2) (2008) 283-288
35. Ashok Kumar Ray, Bangsidhar Goswami, Hemant Kumar Das, and Sashi Bhusan Kumar, Damage resistance of a thermal barrier coated superalloy for combustor liners in aero turbines during fatigue and creep, Canadian Metallurgy Quarterly 47 (4) (2008) 479-494
36. B.Goswami, S.K. Sahay and A.K. Ray, Application of TBC in light weight gas turbine, J. Met and Mater Sci, 50 (1) (2008) 1-21
37. A.K. Ray, B. Goswami, S.B. Kumar and S.K. Sahay, Fatigue in gas turbine components, J. Met and Mater Sci 50 (2) (2008) 85-105
38. A.K. Ray, E.S. Dwarakadasa, D.K. Das,V.R. Ranganath, B.Goswami, J.K. Sahu and J.D. Whittenberger, Fatigue behavior of a thermal barrier coated superalloy at 800 ºC, Materials Science and Engineering-A, 448 (2007)294-298
39. A. K. Ray, K. Diwakar, B.N.Prasad ,Y.N. Tiwari, R.N. Ghosh and J.D. Whittenberger, Long term creep rupture behaviour of 813 K exposed 2.25-1Mo steel between 773 and 873 K, Materials Science and Engineering A, 454-455(2007)124-131
40. A. K. Ray, Y.N. Tiwari, P.K. Roy, S.C. Bose, S. Chaudhuri, R.N. Ghosh and J.D. Whittenberger, Creep rupture analysis and remaining life assessment of 2.25Cr-1Mo steel tubes from a thermal power plant,
41. B.Goswami , B. Ravi Kumar, S. Tarafder, G.Krishna, P. K.P. Rupa , S.B. Kumar and A.K. Ray, Fatigue damage of a thermal barrier coated Ni-base superalloy, High Temperature Materials and Processes, 26 (3)(2007) 209-219
42. S.K.Sahay, B.Goswami, S.B Kumar and A.K.Ray, Development in cobalt-base alloys for high temperature applications, J. of Met. And Mater Sci., 49(1) (2007) 1-38
43. A.K. Ray, G. Das, H,K, Das, P.K. Roy and R.N. Ghosh, Failure analysis of a boiler feed water piping in a refinery, Journal of the Mechanical Behaviour of Materials 17 (5) (2007) 287-295
44. A.K. Ray,B. Goswami and S.K. Sahay, Studies of Deformation behavior in titanium alloys, Journal of the Mechanical Behaviour of Materials 17 (5)(2007) 297-326
45. S.K.Sahay, S.K.Singh, B.Goswami, S.B. Kumar and A.K.Ray, Recent developments in tungsten carbide-cobalt base cemented carbides, J. of Met. And Mater Sci., 49(3) (2007) 143-173
46. S.K.Sahay, S.K.Singh, B.Goswami, S..B. Kumar and A.K.Ray, Recent developments in cobal- base metallic glasses, J. of Met. And Mater Sci., 49(2) (2007) 59-96
47. B.Goswami and A.K. Ray, Study of superconductivity of high Tc superconductors, J. of Met. And Mater Sci., 49(4) (2007) 183-213
48 B. Goswami, S.B. Kumar and A.K. Ray, Thermal barrier coating for application to light weight gas turbine, Journal of the Mechanical Behaviour of Materials, 18(3) (2007) 167-194
49. Ashok Kumar Ray, Yogendra Nath Tiwary, Prabir Kumar Roy, Gautam Das and Raghubir Singh, Remnant life assessment of radiant heater tubes, Hydrocarbon Asia & PetroMin – RAMS Asia,(4) (2007) 50-56
50.
S.K. Sahay, S.K. Singh, B. Goswami amd A. K. Ray,
Recent developments in cobalt base alloys, J. of Met. and Mater Sci., 48(3) (2006) 129-166
51. A.K. Ray, S.R. Singh, J. Swaminathan, P.K. Roy , Y.N. Tiwari and R. N. Ghosh, Structure property correlation study of a service exposed first stage turbine blade in a power plant, Materials Science and Engineering A, 419 (2006)225-232
52. A.K.Ray and D.K. Das, Accelerated creep resistance of thermal barrier coated superalloy, Materials letters, 60 (2006) 3019-3022
53. A.K. Ray, N. Roy, B. Dash, D.K. Das , V.R. Ranganath, B.Goswami, Y.N. Tiwari, P.K.Roy, H.K. Das, D. Sanyal and E.S. Dwarakadasa, High temperature mechanical properties of thermal barrier coated superalloy applied to combustor liner of aero engines, High Temperature Materials and Processes, 25 (3)
(2006)109-119
54. A.K. Ray, S.K. Sahay and B. Goswami, A fundamental approach to fatigue behaviour of Ni base superalloys, Journal of the Mechanical Behaviour of Materials, 17(2) (2006) 97-120
55. Ashok Kumar Ray, Bangsidhar Goswami, Mahendra Prasad Singh, Deepak Kumar Das, Nilima Roy, Bomkesh Dash, B. Ravi Kumar, Ajoy Kumar Ray, Gautam Das, P.Karuna Purnapu Rupa, Narayan Parida, Arpan Das, Jagannathan Swaminathan and Eshwarahalli Dwarakadasa, Characterization of bond coat in a thermal barrier coated superalloy used in combustor liners of aero engine, Materials Characterization, 57 (3) (2006) 199-209
56. S.K.Sahay, S.K.Singh, B.Goswami and A.K.Ray, Studies of oxidation behavior in Ti-base alloys, Corrosion Reviews, 24 (5-6)(2006) 353-394
57. S.K.Sahay, S.K.Singh, B.Goswami and A.K.Ray, Perspectives of innovative scenarios in titanium base alloys, J. of Met. And Mater Sci., 48(3) (2006) 181-204
58. A.K. Ray, Y.N.Tiwary, A.J. Khan, P.K.Roy, G. Das and R. Singh, Health Assessment of Radiant Heater Tube, High Temperature Materials and precesses, 24 (1) (2005) 35-45
59. A.K. Ray, D.K. Das , B. Venkataraman, P.K.Roy, B. Goswami, N. Roy, S.K. Das, , N. Parida, S. Tarafder, S.Chaudhuri and R. N. Ghosh Characterization of rupture and fatigue resistance of TBC superalloy for combustion liners, Materials Science and Engineering- A , 405 (1-2)(2005) 194-200
60. S.K. Sahay, S.K. Singh, B. Goswami and A.K. Ray, Creep behaviour in Ti- based alloys, High Temperature Materials and Processes, 24 (5) (2005) 323-336
61. S.K. Sahay, S.K. Singh, B. Goswami and A.K. Ray, Studies of phase transformation in Ti-Al-X alloys , High Temperature Materials and Processes,
24 (6) (2005)345-358
62. A.K. Ray, S.R. Singh, A. Kailath, P.K. Roy, S.K. Das and R.N. Ghosh, Fatigue and creep damage and its correlation with microstructures of a service exposed first stage turbine blade in a power plant, J. of Met. and Mater Sci., 47(2) (2005) 59-69
63. Nilima Roy , Kersi M. Godiwalla, Eshwarahalli S . Dwarakadasa , Ashok K. Ray, Elasto- plastic deformation in thermal barrier coated superalloys, Scripta. Met, 51 (7) (2004) 739-743
64. A.K. Ray, G. Das, V.R. Ranganath, B. Goswami and R.N. Ghosh, Failure of connecting pins of a compressor disc in an aero –engine, Engineering Failure Analysis, (11)(4) (2004) 613-617
65. Sudipta Mandal, Ashok Kumar Ray and Ajoy Kumar Ray, Correlation between the mechanical properties and the microstructural behaviour of Al2O3 (Ag-Cu-Ti) brazed joints, Materials Science and Engineering-A, 383 (2004) 235-244
66. B.Goswami, A.K.Ray and. S.K.Sahay, Thermal barrier system for gas turbine application , High Temperature Materials and Processes, 23 (2) (2004) 73-92
67. A.K.Ray and B.Goswami, Applications of thermal barrier coating system in gas turbines – A Review, J. Met. and Mater Sci, 46 ( 1) (2004)1-22
68. B.Goswami, S.K.Sahay and A.K.Ray, Application of thermal barrier coatings on combustion chamber liners, High Temperature Materials and Processes, 23 (3) (2004) 211-236
69. A.K. Ray, D.K.Das,P.K.Roy, B. Goswami, Y.N. Tiwary, V.R. Ranganath, and R. N. Ghosh, Damage resistance of thermal barrier coated superalloy in combustion chamber liner, J. of Met. and Mater Sci., 46( 4 ) (2004). 205-212
70. A.K. Ray, Y.N. Tiwari, P.K. Roy, G.Das, Life prediction of service exposed tubes in a boiler of a thermal power plant, Journal of the Mechanical Behaviour of Materials, 14 (2-3) (2003)149-161
71. Gautam . Das, Sandip. Ghosh Chowdhury, Ashok Kumar Ray, Swapan Das and Dipak .Kumar Bhattacharya, Turbine blade failure in a thermal power plant, Engineering Failure Analysis, (10)(1) (2003) 85-91
72. A.K. Ray, S.K. Sinha,Y.N. Tiwari, J. Swaminathan,, G. Das, S. Chaudhuri,R.Singh, Analysis of failed reformer tubes, Engineering Failure Analysis, (10)(3) (2003) 351-362
73. A.K. Ray, S.K. Sahay and B. Goswami, Assessment of service exposed boiler tubes, Engineering Failure Analysis, (10) (6) (2003).645-654
74. G.Das, A.K. Ray, S.Ghosh, S.K. Das, S. Das and D. K. Bhattacharya, Fatigue failure of a boiler feed pump rotor shaft, Engineering Failure Analysis, (10) (6) (2003) 725-732
75. A.K. Ray, Y.N. Tiwari, R. K. Sinha, P.K. Roy, S.K. Sinha, R. Singh and S. Chaudhuri, Remnant life assessment of service-exposed pendent superheater tubes,Engineering Failure Analysis,9(1)(2002) 892
76. A.K. Ray, Y. N. Tiwari, S. Chaudhuri, V.R. Ranganath, S. Sivaprasad, P.K. Roy, G. Das, S.GhoshChowdhury, P. Kumar and R.N. Ghosh, Remaining life assessment of service exposed reheater and superheater tubes in a boiler of a thermal power plant, High Temperature Materials and Processes, 21 (1-2) (2002) 109-121
77. A.K. Ray, Y. N. Tiwari, J.K. Sahu, J. Swaminathan, S.K. Sinha, S.GhoshChowdhury, G.Das, P.K. Roy, H.K. Das , G.V.S Murthy, P. Kumar, S. Chaudhuri , R.N. Ghosh, Residual life estimation of service exposed reheater tubes in a boiler of thermal power plant, Journal of the Mechanical Behaviour of Materials,13 (2) , (2002) 73-89
78. G.Das, S. Ghosh Chowdhury, A.K. Ray, S. Das and D.K.i Bhattacharya, Failure of a superheater tube, Engineering Failure Analysis (UK), 9 (5) (2002) 563-570
79. K.M. Godiwalla, N. Roy, S. Chaudhuri andA. K Ray, Investigation and modelling of mechanical properties for thermal barrier coatings in gas turbine vane specimens under bending, International Journal of Turbo and Jet Engines, 18 ( 2) (2001)77-103
80. A.K. Ray, Y.N. Tiwari, R.K. Sinha, S.K. Sinha, P.K. Roy, R.Singh and S. Chaudhuri, Mechanical property evaluation and remaining life assessment of service exposed steam pipe of boilers in a thermal power plant, High Temperature Materials and Processes , 20 (1)(2001)39-50
81. Nilima Roy, Kersi M Godiwalla, Satyabrata Chaudhuri and ,
Ashok K Ray, Simulation of bond coat properties in thermal barrier coatings during bending, High Temperature Materials and Processes, 20,(2) (2001) 103-116
82. A.K. Ray, N.Roy and K.M. Godiwalla, Crack propagation studies and bond coat properties in thermal barrier coatings under bending, Bull. Mater. Sci, Vol 24 (2) (2001) 203-214
83. A.K. Ray, Y.N. Tiwari, P.K. Roy, R.K. Sinha, Remaining life assessment of service exposed steam pipe of boilers in a thermal power plant, Journal of the Mechanical Behaviour of Materials,12 (1) (2001) 21-34
84. Ashok Kumar Ray, Yogendranath Tiwari and Satyabrata Chaudhuri, Mechanical properties of service -exposed pendant superheater tubes of a thermal power plant, Journal of the Mechanical behaviour of Materials ,12 (3) (2001) 159-175
85. Ashok K Ray, Failure mode of thermal barrier coatings for gas turbine vanes under bending, International Journal of Turbo and Jet Engines, 17 (1) (2000) 1-24
86. A.K.Ray, K.K. Mishra G.Das and P.N.Choudhury, Life of rolls in a cold rolling mill in a steel plant, Engineering Failure Analysis, 7 (1) (2000) 55-67
87. A.K. Ray, Y.N. Tiwari, R. Singh and S. Tarafder, Prediction of remaining life of a FCCU reactor plate, Engineering Failure Analysis,7 (2) (2000)75-86
88. A.K. Ray, Y.N. Tiwari, R.K. Sinha, S. Chaudhuri and R.Singh, Residual life prediction of service exposed main steam pipe of boilers in a thermal power plant, Engineering Failure Analysis , 7 (5) (2000), 359-376
89. A.K. Ray, Y.N. Tiwari and S. Chaudhuri, Evaluation of mehanical properties and assessment of residual life of a service exposed water wall tube, Engineering Failure Analysis , 7 (6)(2000) 393-402
90. A.K. Ray, Y. N. Tiwari, S. Chaudhuri, S. Tarafder and R. Singh, Residual life assessment of FCCU reactor plate, Trans. Indian. Int. Met , 53. (3) (2000) 427-433
91. Ashok K Ray and
Rolf W Steinbrech, Crack propagation studies of thermal barrier coatings under bending, J.European ceramic Society,19 (12) (1999) 2097-2109
92. A.K.Ray, G. Das, N.K. Mukhopadhyay, D.K. Bhattacharya, E.S. Dwarakadasa and N. Parida, Studies on indentation fracture toughness on ceramic and ceramic composite using acoustic emission technique, Bull. Mater. Sci. 22 (1)(1999)25-32
93. G.V.S. Murthy, A.K. Ray, R.K. Minz and N.K. Mukhopadhyay, Microhardness and fracture toughness studies of decagonal quasicrystalline Al-Cu-Co system, J. Materials Science Letters, 18 (3) (1999) 255-258
94. A.K. Ray, Y.N. Tiwari, S.Tarafder, P.K. Roy, R.K. Sinha, S. Chaudhuri and R. Singh, Prediction of remaining life of service exposed CCU reactor, distillation column and FCCU reactor plates used in petrochemical industries, Chemical weekly, XLIV (19) (1999) 139-143
95. A.K. Ray, Y.N. Tiwari, A.N. Sinha, R.K. Sinha, R. Singh,S. Chaudhuri , Life prediction of service exposed reactor and distillation column materials used in a petrochemical industry, Engineering Failure Analysis , 5 (1998) 289–98
96. Ashok Kumar Ray, A new technique for precracking ceramic specimens in fatigue and fracture, J. European Ceramic Society, 18 (12) (1998) 1655-1662
97. A.K. Ray, S.K.Das, S. Maity, N.K. Mukhopadhyay, S. Tarafdar and E.S.Dwarakadasa, Impact fatigue and indentation fracture toughness studies on an alumina based wear resistant ceramic, Interceram,46
(3) (1997) 184-187
98. A.K. Ray, E.R. Fuller and S. Banerjee, Fatigue crack growth rate and fracture toughness of 25 wt% silicon carbide whisker reinforced alumina composite with residual porosity, J. European. Ceram. Soc.,16 (5) (1996) 503-513
99. A.K. Ray, S.K. Das, P.K. Roy and S. Banerjee, Fractography of fatigued and fractured regions in a silicon carbide reinforced alumina composite, J. European, Ceram. Soc., 15 (3), (1995) 191-199
100. I.Chattoraj, S.B. Tiwari, A.K. Ray and S.K. Das, Investigation on the mechanical degradation of a steel line pipe due to hydrogen ingress during exposure to a simulated sour environment, Corrosion Science, 37 (6), (1995) 885-896
101. A.K. Ray, S. Banerjee, E.R. Fuller, S.K. Das and G. Das, Fractography as well as fatigue and fracture of 25 wt% silicon carbide whisker reinforced alumina ceramic composite, Bull. Mater. Sci., 17 (6) (1994) 893-910
102. A.K. Ray, E.S. Dwarakadasa and K.S. Raman, The Influence of porosity and inclusions on properties of butt weld of 15CDV6 steel, Tool and Alloy steels, July/August (1986) 229-240
103. A.K. Ray, K. S. Raman and E. S. Dwarakadasa, Effect of porosity and slag inclusion on the fatigue fracture behaviour of 15CDV6 steel welds, J Mater. Sc. Letters, 5 (1986)
765-768
104. A.K.Ray and C. R. Krishnomurthy, Electrodeposition of Cu-Sn alloy from a mixture of copper sulphate and stannous fluoborate bath, J. Electro. Chem. Soc of India, 33 (4) (1984) 201-203
105. A. Raj, B. Goswami and A. K. Ray, Creep and fatigue behavior in micro-alloyed steels – a review, High Temperature Materials and Processes, 32 (2013) in press
DOI 10.1515/htmp-2012-0177
106. A. Raj, B. Goswami, S.B. Kumar and A.K. Ray, Forge and Heat-treatments in Microalloyed
Steels – A Review, High Temperature Materials and Processes, 32 (2013) in press
DOI 10.1515/htmp-2012-0178
107. A.Raj, B.Goswami,S.B.Kumar, N.Roy and A.K.Ray, Performance and life assessment of reformer tubes in petrochemical industries, High Temperature Materials and Processes, (2013)accepted
108. A.Raj, B.Goswami,S.B.Kumar, N.Roy and A.K.Ray, Damage analysis of service exposed reformer tubes in petrochemical industries,
High Temperature Materials and Processes, (2013)accepted
109. A.K.Ray, Y.N. Tiwary, G. Das, M. Gunjan, S.C. Bose and R.N. Ghosh, Health assessment of twenty two years service exposed radiant tube from an oil refinery, Proceedings of National seminar on NDE based condition of plant components , (Thermal Research Centre CPRI Nagpur) (Oct 2010) Vol 1, pp1-pp18 National
110. A.K. Ray, Y.N. Tiwari, P.K.Roy,G.Das and R. Singh, Remnant life assessment of radiant heater tube, Proceedings of Pressure Vessels and Piping , Materials and properties (Edt.Baldev Raj, B.K. Choudhary, Anish kumar),Narosa Publishing House (New Delhi) Vol II, (2009) pp245-pp255 International
111. A.K. Ray and D.K. Das, Efficacy of thermal barrier coated superalloy used in turbines, Proceedings of Remaining Life Assessment of aged components in thermal power plant and petrochemical industries (26-27 July 2006), NML publication (Eds. A.K. Ray, S. Chaudhuri, N.G. Goswami and R.N. Ghosh),Vol.2 (2008)pp1-pp29, National
112. A.K. Ray, Y. N. Tiwari, S.Chaudhuri and R.N. Ghosh, Remaining life assessment of service exposed tubes in thermal power plant, Proceedings of International Conference on Developments in Steel Tube Technology- An Imperative for the Auto and Engineering Industry, 17-16 December (2004) SNTI ,Jamshedpur, (organized by IIM and TATA STEEL), Steel City Press, Pp 83-90, International
113. A.K. Ray and Y.N.Tiwari, Oxide scale deposition and its effect on remaining life estimation nofv service exposed reheater tube in a boiler of a thermal power plant, Proceedings of National seminar on CFM-2004, Aug 17 and 18, NML Jamashedpur,Pp21-32, National
114. Ashok K Ray, Health assessment study of service exposed tubes in a boiler of a thermal power plant, Proceedings of national seminar on Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries (RLA-2003), ( Jan 8-9,2003) , NML publication,(Eds. S.Sivaprasad, S. Chaudhuri, R. Singh and A.K. Ray) , Vol.1, pp121-pp130, National
115. Ashok Kumar Ray and Nilima Roy, Modeling elasto-plastic deformation and crack propagation studies of thermal barrier coated superalloys; Proceedings of Indo- Malaysian Workshop on Advanced Materials, (WAM-2003), 12th-13th March 2002, NML Jamhedpur, Allied Publishers, New Delhi, pp 129-139, International
116. A.K. Ray, Y.N. Tiwari, S. Chaudhuri, S. Tarafder and R. Singh, Residual life assessment of FCCU reactor plate, Proceedings of third workshop on Creep, Fatigue and Creep-Fatigue Interaction, IGCAR Kalpakkam, Jan 20-22 (1999), ppC 168-C 180, National
117. A.K.Ray, K.K.Mishra and P.N. Chaudhury, Failure Analysis of rolls of cold rolling mill in a steel plant, Proceedings of workshop on Failure Analysis, (Eds. S. R. Singh, N. Parida, D.K. Bhattacharya and N.G. Goswami), NML Pub. (1997) pp37-46, National
118. A.K.Ray, Y.N. Tiwary, R.K. Sinha, R. Singh and
S. Chaudhuri, Remaining life assessment of service exposed reactor and distillation column materials used in a petrochemical industries, Proceedings of international conference on Recent Advances in Metallurgical Processes held at IISc Bangalore, Vol-II, (Eds. D.H. Sastry, E. S. Dwarakadasa, G.N.K.Iyenger, S.Subramanian), published by New Age International (P)Limited (16-19 July 1997) p1335-1341, International
119. A.K. Ray, D. K. Bhattacharya and G. Das, Acoustic emission studies during indentation on ceramic and ceramic composite, Proceedings of 14th World Conference on Non Destructive Testing (WCNDT)- New Delhi, Vol.(1-5), (eds. C.G. K. Nair, Baldevraj, C.R.L. Murthy, T. Jay Kumar), Oxford and IBH Publishing House (1996),pp-2445-2448, International
120. A.K. Ray, E.R. Fuller and S. Banerjee, Precracking of ceramic specimen and determination of fracture toughness as well as fatigue crack growth rate of 25 wt% SiC reinforced Al2O3 composite, Proceedings of national workshop on Creep, Fatigue and Creep- Fatigue Interaction (1995), IGCAR Kalapakkam, C332-348, National
121. A.K. Ray, E.S. Dwarakadasa, K.S. Raman and G. S. Narayana, Fatigue crack growth behaviour of a butt welded HSLA steel, Proceedings of International Welding Conference-IWC-87, New Delhi (January 1987); p499-519, National
122. A.K. Ray, E.S. Dwarakadasa and K.S. Raman, The Influence of porosity and inclusions on properties of butt weld of 15CDV6 steel, Technical Proceedings of NWS Welding-85, Calcutta (1985) )p II-13-1 to II13-23, National
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| Conferences/Workshops/Seminars Organized: |
1) Organized Metallurgical Quiz Contest for BE sudents in Metallurgy in a seminar on “Behind the Teacher’s Desk” (BTTD-2013) during April 5-6, 2013 at CSIR-NML, organized by IIM Jamshedpur Chapter and TATA Steel.
2) Organized Prof. S.N. Sinha Metallurgical Quiz Contest for class X-XII during July 30-31, 2013 at CSIR-NML, organized by IIM Jamshedpur Chapter and TATA Steel.
3) Faculty and organizing committee member of Technical Course on “Metallurgy for Engineers”(MFE-2007) during December 10-14, 2007 organized by NML and Institution of Engineers, Jamshedpur Chapter.
4) Organizing committee member of NMD-ATM 2006 (14th to 16th Nov 2006), Jamshedpur
5) Convener of the National Seminar on “Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries” (RLA-2006), July 26-27 ,2006 at NML Jamshedpur, organized by NML and IIM Jamshedpur Chapter.
6) Convener of the International Seminar on “Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries” (RLA-2003), Jan 8-9, 2003 at NML Jamshedpur, sponsored by CSIR, NFL and NLC.
7) Faculty and organizing committee member of Technical Course on “Metallurgy for Engineers” (MFE-2003) during January 21-23, 2003 organized by NML and Institution of Engineers, Jamshedpur Chapter.
8) Organizing committee member of National Workshop on “Promotion of Enterpreneural skills for Empowerment of Women” (ESEW-2003), during February 4-6, 2003, at NML Jamshedpur, organized by NML.
9) Organizing committee member of National Workshop on “Skill-Cum- Technology Upgradation Programme on Technological Entrepreneurship in the New Millennium for Tiny/Small Sector in Ceramic and Metal Working Units” (STUP), during February 2002 at NML Jamshedpur.
10) Organizing committee member of International Workshop on “Fatigue,Fracture and Integrity Assessment” (FFIA-2002), during 28-29 November 2002., organized by NML Jamshedpur.
11) Organizing Committee member of International Workshop on “Processing of Fines” (PROF-2000), during November 2-3,2000, organized by NML at NML Jamshedpur.
12) Organizing Committee member of International Workshop on “Environmental and Waste Management in Iron and Steel Industries” ( EWM-2000 ), preponed during December 2-3, 1999, organized by NML and IIM Jamshedpur Chapter, at NML Jamshedpur.
13) Organizing Committee member of International Workshop on “Environmental and Waste Management in Nonferrous Metallurgical Industries” (EWM-1998), during January 29-30, 1998, organized by NML and IIM Jamshedpur Chapter, at NML Jamshedpur.
14) Organizing Committee member of International Workshop on “Processing of Fines” (PROF-1997), during January 9-10, 1997, organized by NML at NML Jamshedpur.
15) Organizing Committee member of International Workshop on “Environmental and Waste Management in Metallurgical Industries” (EWM –1996), during February 12-13, 1996, organized by NML and IIM Jamshedpur Chapter, at NML Jamshedpur..
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| Conferences/Workshops/Seminars Attended: |
1.The Influence of porosity and inclusions on properties of butt weld of 15CDV6 steel, A.K. Ray, E.S. Dwarakadasa and K.S. Raman, National Welding Seminar- NWS-Welding-85, (July 1985), Calcutta.
2. Fatigue crack growth behaviour of a butt welded HSLA steel, . International Welding Conference-IWC-87, (January 1987), New Delhi.
3. Fracture toughness, fatigue crack growth rate and fractographic features of silicon carbide reinforced alumina composite, Ashok Kr Ray and S Banerjee , ASME Meeting USA (October 1992).
4. Fractographic studies of advanced ceramic composite and its correlation with mechanical properties, A.K. Ray, S.K. Das and S. Banerjee, 30th NMD & 46th ATM, (November 14-17 1992), Udaipur.
5. Optimising the life of a cold mill work roll, A. K. Ray, K. K. Mishra O. N. Mohanty,P.N. Chaudhury, A. Chakraborty, R. S. Verma and Ram Avtar , 31st NMD & 47th ATM, (November 17-19,1993), Hyderabadh.
6. Acoustic emission studies on palmqvst testing on a 25 weight percent SiC whisker reinforced alumina, N. Parida, A.K. Ray, P.S. Mondal, G. Das and D. K. Bhattacharya , National seminar on nondestructive evaluation techniques for improving quality and reliability in industry organised by ISNT (December 8-9, 1994), BARC Bombay.
7. Precracking of ceramic specimen and determination of fracture toughness as well as fatigue crack growth rate of 25 wt% SiC whisker reinforced Al2O3 composite, A.K. Ray, E.R. Fuller and S. Banerjee, National workshop on creep, fatigue and creep-fatigue interaction (February 15-17, 1995), IGCAR Kalapakkam.
8. Mechanical property evaluation and creep life prediction of a service exposed reactor material, A.K. Ray, S. Chaudhuri, R. Singh, D.K. Bhattacharya and R. N. Ghose , 36th NMD & 49th ATMm, (November 14-17, 1995), Calcutta.
9. Development of an alumina based wear resistant ceramic and its impact fatigue and indentation fracture toughness studies, A.K. Ray, S. K. Das, S. Maity, N. K. Mukhopadhyay, S. Tarafdar and E.S.Dwarakadasa, 7th Annual Technical Meeting of Materials Research Society of India at IISc Bangalore, (1-3 February, 1996).
10. On the investigation of mechanical properties of decagonal quasicrystals in Al-Cu-Co system, G. V. S Murthy, A. K. Ray, A. K. Chattopadhyay, R. K. Minz and N. K. Mukhopadhyay, 50 ATM of IIM at Vigyan Bhavan, New Delhi, (14-17 Nov, 1996).
11. Mechanical property evaluation and life prediction of a service exposed FPU- D1 distillation column material from a petrochemical industry, A.K. Ray, Y.N. Tiwari, R.K. Sinha, R. Singh and S. Chaudhuri , 8th Annual Technical Meeting of MRSI at BARC Bombay (10-12 Feb 1997).
12. Failure analysis of rolls of cold rolling mill in a steel plant, A.K. Ray, K. K. Mishra & P. N. Chaudhury , National workshop on Failure Analysis, COFA-97 (10-14 Feb 1997).
13. Tensile as well as impact testing of materials, A.K.Ray , National seminar on METPEM -96 (11-12 Dec 96), NML Jamshedpur.
14. Acoustic emission studies during indentation on ceramic and ceramic composite, A.K. Ray, D.K. Bhattacharya and G. Das, 14th World Conference on Non Destructive Testing, (WCNDT), (8-13 Dec 1996), New Delhi, India.
15. Forge roll life -operation vs manufacture, P. N. Chaudhury, A. K. Ray, A.N. Sinha and K. K. Mishra, 51st ATM of the Indian Institute of metals,14-17 November 1997, Jamshedpur.
16. Studies on the effect of monoclinic zirconia dispersion on the sintering and strength of alumina ceramics, S. K. Malaviya, K. K. Singh, A. Bahadur, A.K. Ray & G. N. Agarwal , 3rd India International Refractories Congress (TREFCON-’98), (Feb 11-13, 1998), Calcutta.
17. Crack propagation studies under bending for thermal barrier coatings in power plant application, Ashok Kumar Ray ,International Seminar on Recent Trends in metal Joining and Materials Testing, (July 24, 1998), IISc Bangalore.
18. Residual life assessment of FCCU reactor plate, A.K. Ray, Y. N. Tiwari, S. Chaudhuri, S. Tarafder and R. Singh , Third Workshop on Creep, Fatigue and Creep Fatigue Interaction, (20-22 Jan, 1999), IGCAR Kalpakkam.
19. Thermomechanical characterisation and modelling of ceramic coatings in gas turbine application, A.K. Ray, Invited talk at NML Jamshedpur on 18.6.98 organised by Institution of engineers , Jamshedpur Chapter, NML Jamshedpur.
20. Crack propagation studies and modeling of bond coat properties in thermal barrier coatings under bending, Ashok K Ray, Nilima Roy, Kersi M. Godiwalla and Rolf W. Steinbrech, International conference on Fatigue and Fracture of Glass, Ceramics and Composites (CFFGLACE-99), (Sept 22-23, 1999), IACS Calcutta.
21. Modeling and investigation of bond coat properties in thermal barrier coatings for gas turbine vane specimens under bending, Nilima Roy, Kersi. M. Godiwalla, Rolf.W. Steinbrech, Satyabrata. Chaudhuri and Ashok.K. Ray, NMD/ATM-1999, (14-17 Nov, 1999) ,IIT Kanpur.
22. Effect of oxide scale deposition on the residual life of service exposed reheater tubes in boiler of a thermal power plant, A.K. Ray, Y.N.Tiwari, J.K. Sahu, P.K. Roy, S.K. Sinha, G. Das, S. Ghosh Choudhury, and S. Chaudhuri, National Seminar on Corrosion and its Prevention (NSCP- 2001), (9-10 Dec 2001), NML Jamshedpur.
23. Mechanical properties and fracture behaviour of thermal barrier coatings during bending, Ashok Kumar Ray, Invited talk at INDO-ISRAEL workshop on Advanced Materials (February 11-13, 2001), Hyderabad, organised by International Advanced Research Centre for Powder Metallurgy and New Materials (ARC International), Hyderabad, India, sponsored by DST (Department of Science & Technology, India and Ministry of Science, Culture & Sports, Israel), Ramoji Film City, Hyderabad..
24. Mechanical property evaluation and remaining life assessment of service exposed reheater and superheater tubes in a boiler of a thermal power plant, A.K. Ray, Y. N. Tiwari, S. Chaudhuri, S. Sivaprasad, P.K. Roy, G. Das, S.GhoshChowdhury, P. Kumar and R.N. Ghosh, 39th NMD& 55th ATM;( 21st Nov. 2001), Bhubaneshwar.
25. Remaining life assessment of service exposed reformer tubes , S. Chaudhuri, J. Swaminathan, S. Sivaprasad, A.K. Ray, S.K. Sinha, P.K. Roy, P.S. Subba Rao and R. Singh , 39th NMD& 55th ATM;( 21st Nov. 2001), Bhubaneshwar.
26. Modeling elasto-plastic deformation and crack propagation studies of thermal barrier coated superalloys, Ashok Kumar Ray and Nilima Roy, Indo- Malaysian Workshop on Advanced Materials, (WAM-2003), (12th-13th March 2002), NML Jamshedpur.
27. A novel technique for precracking ceramic specimens in fatigue and fracture, Ashok Kumar Ray, Invited talk at International Seminar on Light Materials Science and Technology (LMST –2003 ), (April 16-17, 2003), organised by IISc Bangalore and IIM Bangalore Chapter, IISc Bangalore.
28. Health assessment study of service exposed tubes in a boiler of a thermal power plant, Ashok Kumar Ray, National seminar on Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries (RLA-2003),(Jan8-9,2003),NML Jamshedpur,
29. Health assessment study of radiant heater tube, A.K. Ray, Y.N. Tiwari, A.J. Khan, P.K. Roy, G. Das & R.Singh, 41st National Metallurgists’ Day ;57th Annual Technical Meeting & International Symposium on Innovations in iron & Steel Industry (NMD-ATM 2003) , (14-16 November,2003), organised by IIM Kolkata, B.E. College, Durgapur and Ranchi Chapters, Science City , Kolkata..
30. Assessment of mechanical properties and creep life of service exposed boiler tubes of a thermal power plant , Y.N.Tiwari, A.K. Ray ,J. Swaminathan, P.K. Roy, S. Chaudhuri & R. Singh, 41st National Metallurgists’ Day; 57th Annual Technical Meeting & International Symposium on Innovations in iron & Steel Industry (NMD-ATM 2003) , (14-16 November,2003),. organised by IIM Kolkata, B.E. College, Durgapur and Ranchi Chapters, Science City , Kolkata.
31. Residual life assessment of platen superheater and reheater tubes based on uniaxial creep rupture tests of a 200 MW thermal power plant, S. Chaudhuri, J. Swaminathan, Y. N. Tiwary, P.K.Roy, A.K. Ray & R. Singh , 41st National Metallurgists’ Day ;57th Annual Technical Meeting & International Symposium on Innovations in iron & Steel Industry (NMD-ATM 2003) , (14-16 November,2003), organised by IIM Kolkata, B.E. College, Durgapur and Ranchi Chapters, ), Science City , Kolkata.
32. Case studies – Turbine blade failure of a thermal power plant, Gautam Das and Ashok Kumar Ray, National Workshop on Metallurgy for Engineers, ( Jan 21-23, 2003), NML Jamshedpur.
33. Failure analysis and remaining life assessment of super heater tubes, Ashok Kumar Ray, National Workshop on Metallurgy for Engineers, ( Jan 21-23, 2003), organised by NML Jamshedpur and Institution of Engineers, Jamshedpur Chapter, NML Jamshedpur
34. Oxide scale deposition and its effect on remaining life estimation nofv service exposed reheater tube in a boiler of a thermal power plant, A.K. Ray and Y.N.Tiwari , National Seminar on CFM-2004, (Aug 17 and 18), NML Jamashedpur.
35. Corrosion failure of a steam turbine blade, G.Das, S.K, Das, A.K. Ray and S. Ghosh Chowdhury , National Seminar on Prevention of Corrosion in Steel Structures, (14-15 Dec 2004), NML Jamshedpur.
36. Remaining life assessment of service exposed tubes in thermal power plant, A.K. Ray, Y. N. Tiwari, S.Chaudhuri and R.N. Ghosh, International Conference on Developments in Steel Tube Technology- An Imperative for the Auto and Engineering Industry, (17-16 December 2004), organised by IIM and TATA STEEL, SNTI ,Jamshedpur.
37. Review of quality system documentation- ISO9001 2000 version for Internal Auditors, Ashok Kumar Ray and Amitava Bandhopadhyay, Internal Quality Auditor’s course during (21-22 Dec 2005) at NML Jamshedpur.
38. Remnant life assessment of radiant heater tube, Ashok Kumar Ray, Yogendra Nath Tiwary, Prabir Kumar Roy, Gautam Das and Raghubir Singh, Internationl Conference and Exhibition on Pressure Vessels and Piping OPE-2006, Chennai; organized by IGCAR Kalpakkam, IIM Kalpakkam chapter, IMEA Australia and WTIA Australia; (7th-9th Feb 06), IGCAR Kalpakkam.
39. Efficacy of thermal barrier coated superalloy used in turbines. National Seminar on Remaining Life Assessment, A.K. Ray and D.K. Das, National Seminar on Remaining Life Assessment of aged components in thermal power plant and petrochemical industries (26-27 July 2006), organised by IIM Jamshedpur Chapter and NML, NML Jamshedpur.
40. Fatigue behavior of a thermal barrier coated superalloy at 800 ºC, A.K. Ray, D.K. Das, V.R. Ranganath and J.D. Whittenberger, NMD-ATM 2006 (14th to 16th Nov 2006), Jamshedpur.
41. Magnetic evaluation of creep on service exposed 5Cr-0.5Mo steel, N.Mohapatra, A.K.Panda, A.K.Ray and A.Mitra, NMD-ATM2006 (14th to 16th Nov 2006) Jamshedpur.
42. Health Assessment of a Service Exposed Radiant Heater Tube, A .K. Ray, P. K. Roy, Y. N. Tiwary, H.K.Das, J. N .Mohapatra, A. Mitra and R .N. Ghosh, ISAS-2007, Chennai (9-11 April 2007), organized by IGCAR Kalpakkam and IIM Kalpakkam Chapter, Chennai.
43. Effect of alumina scale growth on fatigue resistance of a thermal barrier coated superalloy, A. K. Ray, B. Goswami , S.B. Kumar and D.K,.Das, Diamond Jubilee of the Department of Materials Engineering, Indian Institute of Science, Bangalore-560012 (4th to 6th July 2007),IISc Bangalore.
44. Creep rupture analysis and life estimation of 2.25Cr-1Mo steel tubes from a thermal power plant, Ashok Kumar Ray, National conference on enhancement of plant availability by life assessment and condition monitoring (LACOM-2007), (19th –20th Dec 2007), CMERI Durgapur.
45. Efficacy of thermal barrier coated superalloys for turbine applications , Ashok Kumar Ray, Materials Research Society of India –Medal Award, during AGM-MRSI (2008), (14th –16th February 2008) ,Sree Chitra Tirunal Institute for Medical Sciences & Technology, Trivandrum.
46. Method of evaluation of thermal barrier coated (TBC) superalloy used in combustor liners of aero and gas turbines, Ashok Kumar Ray, Invited talk on one day workshop on Thermal Barrier Coatings-2008, organised by DMRL Hyderabad, (17th July 2008), DMRL Hyderabad.
48. Fatigue and creep damage resistance of a thermal barrier coated superalloy for combustor liners in aero turbines, Ashok Kumar Ray, Bangsidhar Goswami, Yogendra Nath Tiwary, Hemant Kumar Das, Deepak. Kumar. Das and Sashi Bhusan Kumar, International seminar on Creep, Fatigue and Creep Fatigue Interaction (CF5) organised by IGCAR Kalpakkan and IIM Kalpakkam Chapter, (24th-26th September 2008,) IGCAR Kalpakkam.
49. Evaluation of Life time of a thermal barrier coated superalloy used in turbine blade, A.K.Ray, S.C.Bose, P.K. Roy, Z.Alam, D.K. Das and J.D. Whittenberger,63rd Annual Technical Meeting & International Symposium on Innovations in iron & Steel Industry (NMD-ATM 2009), (14-17th November,2009), organised by IIM Kolkata, B.E. College, Durgapur and Ranchi Chapters, Science City , Kolkata..
50. Interdependence of on-load corrosion, creep-rupture, and copper deposit in augmenting failure processes of boiler tubes and failure analysis of LP blades in industrial turbine, Ashok Kumar Ray and Samir Chandra Bose, National Seminar on Failure Analysis (NSFA 2010), Center for Excellence, Jamshedpur, (23rd January 2010), organised by TATA Steel and IIM Jamshedpur chapter
51. Health assessment of twenty two years service exposed radiant tube from an oil refinery, A.K. Ray, Y.N. Tiwary, G. Das, M. Gunjan, S.C. Bose and R.N. Ghosh, National seminar on NDE based condition of plant components (21st October 2010), Central Power Research Institute Nagpur, organised by Thermal Research Centre. CPRI.
52. The influence of high temperature oxidation resistant titanium aluminide coating on low cycle fatigue behaviour of titanium alloy IMI 834 at 600oC, A.K. Ray, International seminar on Creep, Fatigue and Creep Fatigue Interaction (CF6) organised by IGCAR Kalpakkan and IIM Kalpakkam Chapter, (22nd-25th January 2012) Mammallapuram, Tamil Nadu, India.
53. Damage assessment of service exposed reactor and distillation column materials of a petrochemical industry, Nilima Roy, Krishna Guguloth, Sumanta Bagui, Yogendra Nath Tiwary and Ashok Kumar Ray, 66th Annual Technical Meeting & International Symposium on Converting Challenges into opportunities: Iron and Steel (NMD-ATM 2012) , (16-19th November,2012), organised by IIM Jamshedpur,Rachi, Bokaro, Ghatsila Chapters and TATA Steel.
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| Books Published: |
1.Editor of Proceedings of International seminar on “Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries (RLA-2003), Jan 8-9,2003 at NML Jamshedpur, sponsored by CSIR, NFL and NLC,Vol.1 (2003).
2. Editor of Proceedings of seminar on “Remaining Life Assessment of Aged Components in Thermal Power Plants and Petrochemical Industries (RLA-2006), July 26-27, 2006 at NML Jamshedpur, sponsored by CSIR and IIM Jamshedpur Chapter, NML publication, Vol.2 (2008).
3. Ashok Kumar Ray-single-authored book chapter (chapter 5) on ‘Mechanical property and characterization of a NiCoCrAlY type metallic bond coat used in turbine blade made of AE-437A Ni base superalloy in “Superalloy Production, Properties and Applications” ISNB:978-1-61209-536-3 by Nova Science Publishers,Inc. USA, (2011) Editor: Jeremy E. Watson, pp 73-66 .
4. AK Ray, N Roy, B Dash , V.R. Ranganath, B. Goswami and E.S. Dwarakadasa, in Failure : Chapter 8 : Introduction to the science and engineering of materials : MSE 209, DOI: 20050120-1007 , University of Virginia (USA), Editor: Raul A. Baragiola
5. Ashok Kumar Ray- single-authored book chapter (chapter 4) on “Characterization of a NiCoCrAlY type metallic bond coat used in turbine blade made of AE-437° Ni base superalloy” in ‘Theory and Uses of Acoustic Emissions” Materials Science and Technologies’, ISBN: 978-1-61209-960-6, by Nova Science Publishers, Inc. USA (2011) , Editor:Justin K. Burnett, pp 76-93.
6.Ashok Kumar Ray- single-authored book chapter on “Lifetime evaluation of a thick thermal barrier coated superalloy used in turbine blade” in ‘Advances in Materials Science Research’ Volume 12, ISBN: 978-1-62100-091-4, by Nova Science Publishers, Inc. USA, (2012), Editors: Maryann C. Wythers ,pp255-274.
7. Ashok Kumar Ray and Nilima Roy “Uncertainty in damage assessment and remaining life prediction of engineering material” article in ‘Society for Failure Analysis’ Newsletter, Issue 8, May (2013), SFA Newsletter published from Hyderabad (India), Editors: T. Jayakumar and P. Parameswaran.
8. B.Goswami, S.B.Kumar and A.K.Ray- book on “Thermomechanical characterization of ceramic coatings for combustion chamber liners”, LAP LAMBERT Academic Publishing- trademark of: AV Akademikerverlag GmbH & Co. KG, Handelsregister Amtsgericht Saarbrücken HRA 10356; Identification Number (Verkehrsnummer): 11868;Partner with unlimited liability: VDM Management GmbH; Handelsregister Amtsgericht Saarbrücken HRB 18918 ,Acqisition Editor: Irina Rusu. To be published in January 2014.
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| Awards: |
1) Received NIJHAWAN AWARD for the best technical paper published from NML on 26.11.96 from Shri. Ramamurthy, Secretary to DST . The paper was published in the Journal of European Ceramic Society , Vol 15 (1995) 191-199 on “Fractography of fatigued and fractured regions in a silicon carbide whisker reinforced alumina composite”, authored by Ashok Kr.Ray, Swapan Kr Das, Prabir Kr Roy and S. Banerjee.
2) Received MRSI (MATERIALS RESEARCH SOCIETY OF INDIA) Medal Award on 15.02.08.
3) Elected as the Fellow of the Institution of Chemists, India in August 2000
4) Honored as the CHARTERED CHEMIST of THE INSTITUTION OF CHEMISTS, INDIA in March 2001
5) Nominated as and elected Vice Chairman of IIM Jamshedpur Chapter in April 05
6) Executive member of IIM Jamshedpur Chapter since July 2007 till July 2008
7) Certified Lead Auditor by Bureau Veritas (UK) in April 2006
8) Editorial member of International Journal-Materials Science Research India.
9) Nominated as Alternate Member of Central Boiler Board (India) in March 2007, from NML
10) Fellow of Institution of Engineers in 2007
11) Received "ENGINEERING ACHIEVEMENT AWARD" on 15 September 2010, 43rd Engineers Day by the Institutions of Engineers (India)
12) Received Prof. V A Altekar Award for the Best Technology / Technological Service during 2009-2010 (NML Foundation Day (Diamond Jubilee Year Award -November 26, 2010 ) on “Assessment of Creep rupture and elevated temperature tensile strength of steel grades” along with S Chaudhari, G. Krishna, R.N.Ghosh, J.Swaminathan and P.K.Roy
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| Memberships: |
1) Life member of Materials Research Society of India (MRSI): No-(LMB 358), in 2000
2) Life member of Indian Society for Nondestructive Testing (ISNT): No-(M3091), in 1998
3) Fellow and . Life member of Institution of Chemists, No-(M2644), in 2000
4) Chartered Chemist of Institution of Chemists, No- (M2766), in 2000
5) Council Member of Institution of Chemists, since 2001
6) Hon Joint Secretary of Institution of Chemists since 2001
7) Editorial member of the Journal of Institution of Chemists and in charge of AIC (with and without examination) and FIC (without examination)
8) Life member of IIM (Indian Institute of Metals) in 2003. No- (34189).
9) Fellow in 2007 (No: F 1123137) and Life member of Institution of Engineers in 2004 : No-(M//128754/5)
10) Vice Chairman of IIM Jamshedpur Chapter in April 05 till June 2007
11) Executive member of IIM Jamshedpur Chapter since July 2007 till July 2008
13) Certified Lead Auditor from BVQi (Bureau Veritas) in 2006 and from TUV through MECON in 2000
14) Alternate Member of Central Boiler Board (India) from NML in March 2007
15) Certified Lead Auditor for ISO 9001 -2008 version from TUV Kolkata in August 2010
16) Convener of Cultural Committee of National Metallurgical Laboratory, since 1996 till July 2004
17) Member of NML Library Modernization Committee (HRD) since 2002
18) Member of publication committee of the Journal of Institution of Chemists
19) MR (Management Representative) committee
20) Core committee member of ISO –9001-2008 version
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| Others: |
• Reviewer of several papers in J. Materials Science letters (one), Materials Science and Engineering:A (Ten), J. Metallurgy and Materials Science (six), Indian Journal of Engineering & Materials Sciences (Two), J. Materials Research (Two), Surface and Coatings Technology (Four), International journal of fatigue (one), Journal of Alloys and compounds (one), Canadian Metallurgy Quarterly (one), Engineering Failure Analysis (two), Applied Surface Science (one), The Journal of Applied Polymer Science (one), Materials Performance and Characterization (one).
• Reviewer of DST (three) and CSIR (four) project proposal .
• Trained for CSIR Leadership Programme (CHANGE NML) for 10 days, co-ordinated by Ian Dean (Leadership, Performance and Strategy Developer from Cape Town, South Africa); organised by CSIR-NML Jamshedpur in the first week of Dec 2011.
• Being a certified Lead Auditor, actively took part as a Lead Auditor in Internal Quality Audits of ISO 9001-2000 version. of various divisions at NML and also for training fresh Internal Auditors.
• Working as an active member of the Modernization Committee of NML Library since November 2002.
• Convener of Cultural Committee of NML Jamshedpur.
• Compere of inaugural sessions of various workshops/ seminars/Conferences at NML Jamshedpur.
• Worked for Transport and Hospitality (Accommodation) committee for METCIM-99 seminar held on January 19-20, 1999, organised by MTC Division.
• Qualified for Hindhi examination (Prabodh) on 24.01.2000 ,(Praveen) in June 2009 and (Prag) on 20.05.2010, organised by Home Ministry New Delhi held at NML Jamshedpur .
• For Golden Jubilee Celebrations of NML Jamsahedpur participated in inaugural and cultural programmes for SSBM ( Indoor Finals, Dec 1-3, 1999) at NML Jamshedpur , EWM –2000 TCDC International Workshop (Dec 2-3, 1999) at NML Jamshedpur and during Indo- Russian International Workshop (Dec 7-9, 1999) at NML Jamshedpur.
• Organised dance (solo Kathak Recital) performance of the famous Kathak exponent Smt. Amita Dutt from Kolkata, performing on 3.12.99 evening at NML Auditorium. He has also personally compeered all the cultural programmes.
• Worked extensively for cultural committee as co-ordinator for SSBM (Indoor Finals, 1-3 Dec, 1999) at NML Jamshedpur. Also, organised Kathak recital from Rabindra Bhavan and Sangeet Kalakhestra-Jamshedpur, Ghazal from AIR Jamshedpur on the evening of 1.12.1999 at Rajendra Vidyalaya Auditorium
• Organized Blood Donation Camps (1998-2005) at NML Jamshedpur and donated blood several times.
• Recorded NML Anthem (Proyogshala Geet)
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