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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 14 9 6 –67 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.co Structural Integrity Procedia 00 (2018) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 ir t Structural Integrity Procedia 00 (2018) 000 – 000 Sci nceD rec Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.co c Structural I grity Procedia 00 (2 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

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www.elsevier.com/locate/procedia XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 304HCu a stenitic stainless steel K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Abstract Reduction in CO 2 gas emission and decrease in fuel consumption can result in increase in efficiency of the thermal power plants. Increase in efficiency is directly linked to the steam temperature and pressure which requires materials having high creep strength. This resulted in development of Advanced Ultra Super Critical (AUSC) power plant which aims to increase efficiency to more than 45 % and significant decrease in CO 2 emission. The 304HCu stainless steel is one of the candidate materials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitrogen and increased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K and 1023K over a stress range of 100-240MPa. The creep curve exhibited shorter primary regimes followed by marginal secondary regimes and extended tertiary regime. The variation of steady state creep rate with applied stress exhibited Norton’s power law relationship . The value of n (stress exponent) decreased with increase in temperature but decrease was more pronounced at 923K. The product of steady state creep rate and rupture life obeyed Monkman-Grant relation. The contribution of tertiary creep was found to increase with temperature. Microstructural degradation in the form of coarsened precipitates, dislocation cell formation and deformation bands was the primary reason for increase in tertiary regime of creep curve and increase in the value of damage tolerance factor (λ). A mathematical model based on finite element analysis coupled with continuum damage mechanics has been used to predict the creep deformation and rupture life of 304HCu SS. The prediction of creep curve based on this model was found to be in good agreement with experimental results. 2nd International Conference on Structural Integrity and Exhibition 2018 ss ss t f r f r ti r ture behaviour of aust iti st i less st l K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Abstract Reduction in CO 2 gas emission and decrease in fuel consumption can result in increase in efficiency of the thermal power plants. Increase in efficiency is irectly linked to the steam temperature and pressure which requires materials having high creep strength. This resulted in development of Advanced Ultra Super Critical (AUSC) power plant which aims to increase efficiency to more than 45 % and significant decrease in CO 2 emission. The 304HCu stainless steel is one of the candidate materials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitrogen and increased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K and 1023K over a stress range of 100-240 Pa. The creep curve exhibited shorter primary regimes followed by marginal secondary regimes and extended tertiary regime. The variation of steady state creep rate with applied stress exhibited Nort ’s power law r lationship . Th value of n (stress exponent) decreased with increas in temperature ut decrease was more pronounced at 923K. The product of steady state creep rate and rupture life obeyed Monkman-Grant relation. The contributio of tertiary creep was found to increase with temperature. Microstructural degradation i the form of coarsened precipitates, dislocation cell formation and deformation bands was the p imary reason for increase in t rtiary regime of cr ep curve and increase in the value of damage tolerance factor (λ). A mathematical model based on finite element analysis coupled with continuum damage mechanics has been used to predict the creep deformation and rupture life of 304HCu SS. The prediction of creep curve based on this model was found to be in good agr ement with experimental r sults. 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation a d upture behaviour of 304HCu austenitic stainless steel K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Director te, Noida Abstract Reduction in CO 2 gas emission and d c ease in f el consumption can result in increase in efficien y of the thermal power plants. Increase in efficiency is directly linked to the steam temperature and pressure which requires materials having high creep strength. This resulted in development of Advanced Ultra Super Critical (AUSC) power plant which aims to increase efficiency to more than 45 % and signific nt decrease in CO 2 emission. The 304HCu sta l ss st el is one of the c ndidate materials to be used in AUSC power plant. It con ain around 3 wt. % of co per, certain amounts of niobium and nitrogen and incr ased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K and 1023K over a stress range of 100-240MPa. The creep curve xhibited shorter primary regimes followed by rginal secondary regimes and extended tertiary regime. The variation of steady state creep rate with applied stress exhibited Norton’s power law relationship . The value of n (stress exponent) decreased with increase in temperature but decr ase was more pronounced at 923K. The product of steady state cr ep rate and rupture life obeyed Monkman-Gra t elation. The contribution of tertiary creep was found to increase with temperature. Microstruc ural degradation in the form of coarsened precipitates, dislocation cell formation and deformation bands was the primary reason for increas in tertiary regime of creep curve an increase in t e value of damage tolerance factor (λ). A mathematical model based on finite element analysis upled with continuum damage mecha ics has be n used to predict the creep defo mation and rup ure life of 304HCu SS. The predict on of creep curve based on his model was found to be in good agreement with experimental results. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation and rupture behaviour of 304HCu austenitic stainless steel K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a M terials Development and Tec nology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Abstract Reduction in CO 2 gas emission and decrease in fuel consumpti n c n result in increase in efficiency of the thermal power plants. Increas in efficiency is directly linked to the steam temperature and pressure which requires materials having high creep strength. This resulted in development of Advanced Ultra Super Critical (AUSC) power plant which aims to increase efficiency to more than 45 % and significant decrease in CO 2 emission. The 304HCu stainless steel is one of the candidate materials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitrogen and increased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K and 1023K over a stress range of 100-240MPa. The creep curve exhibited shorter primary regimes followed by marginal secondary regimes and extended tertiary regime. The variation of steady state creep rate with applied stress exhibited Norton’s power law relationship . The value of n (stress exponent) decreased with increase in temperature but decrease was more pronounced at 923K. The product of steady state creep rate and rupture life obeyed Monkman-Grant relation. The contribution of tertiary creep was found to increase with temperature. Microstructural degradation in the form of coarsened precipitates, dislocation cell formation and deformation bands was the primary reason for increase in tertiary regime of creep curve and increase in the value of damage tolerance factor (λ). A mathematical model based on finite element analysis coupled with continuum damage mechanics has been used to predict the creep deformation and rupture life of 304HCu SS. The prediction of creep curve based on this model was found to be in good agreement with experimental results. Keywords: 304HCu SS; Cre p; Con inuum damage mechanics; FE analysis. 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation and rupture behaviour of 304HCu austenitic stainless steel K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Abstract Reduction in CO 2 gas emission and decrease in fuel consumption can result in increase in efficiency of the thermal power plants. Increase in efficiency is directly linked to the steam temperature and pressure which requires materials having high creep strength. This r sulted in deve opment of Advanced Ultra Super Critical (AUSC) power plant which a ms to increase efficiency to more than 45 % and significant decrease in CO 2 emission. The 304HCu stainless steel is on of the ca didate materials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitrogen and increased carbon content for enhancing cr ep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K nd 1023K over a stress range of 100-240MPa. The creep curve exhibited shorter primary regimes followed by marginal secondary regimes and extended tertiary r gime. Th variation of steady state creep rate with applied stress exhibited Norton’s power law elationship . The value of n (stress exponent) decre sed with increase in temper ture but decrease was more pronounced at 923K. The product of steady sta e creep rate and rupture life obeyed Monkman-Grant relation. The contribution of tertiary creep was found to increase with temperature. Microstructural degrad tion in the form of coarsened precipita es, dislocation cell formation and deformation bands was the primary re son for increase in tertiary regime of re p curve and increase in the value of damage tolerance factor (λ). A mathematical model bas d on finite element a al sis coupled with continuum dam ge mechanics has b en used to pre ict the creep defo mati and rupture life of 304HCu SS. The prediction of creep curve based o this model was found to be in good agreement with experiment l results. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. 2nd International onference on Structural Integrity and xhibition 2018 ss ss t f r f r ti r t r i r f 4HCu aust niti st i l ss st l K. . ahoo *a , unil oyal a and . aha b a Homi Bhabha National Institute, Mumbai a Materials Devel pment and Tech ology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Abstract Reduction in CO 2 gas emission and decrease in fuel consumption can result in incr ase in efficiency of the thermal power plants. Increase in efficiency is irectly linked to the st am temperature and pressure which equires materials havi g high creep strength. This resulted in development of Advanced Ultra Super Critical (AUSC) power plant which aims to i cre s efficiency to more than 45 % and significant decrease in CO 2 emission. The 304HCu stainless steel is on of the candid te materials to be used in AUSC power plant. It contains around 3 wt. % of copper, rtain amounts of niobium and nitrogen and increased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless stee at 923K, 973K nd 1023K over a stress ra g of 100-240MPa. The cr ep curve exhibited shor r prima y regimes followed by marginal secondary regimes and exte ded tertiary regime. The variatio of steady stat creep ate with applied tress exhibited Norton’s power law relatio ship . The value of n (stress expon nt) decreased with increase in 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation and rupture behaviour of 304HCu austenitic stainless steel K. C. Sahoo *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a Materials Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida ss ss t f r f r ti r ture behaviour of st iti st i l ss st l , Sunil Go n Bhabh um i Materials Devel pment and Te hno Di ision, Indira G ndhi Centre for Ato c Research, Kalpakkam – 603 102, India Raja Ramanna Fellow, AUSC Missio Directorate, Noida 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation and rupture behaviour of 304HCu austenitic stainless steel K. C. Sah o *a , Sunil Goyal a and K. Laha b a Homi Bhabha National Institute, Mumbai a M terials Development and Tech ology Division, Indira G ndhi Centre for Atomic Research, Kalpakkam – 603 102, India b Raja Ramanna Fellow, AUSC Mission Directorate, Noida Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. To achieve higher plant efficiency and reduction in CO 2 emission, there is a necessity of increase in temperature and pressure of boiler tube in the modern power plants. Advanced Ultra super critical power plant aims to increase the efficiency by increasing the temperature more than 923K and pressure more than 30MPa [ Weitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades of austenitic SS) used in conventional power plant is not adequate. 304grades of stainless steel has been modified by adding 3wt pct. of Cu, increased carbon content and certain amounts of niobium and nitrogen which has good elevated temperature resistance and creep resistance, material named as 304HCu SS. 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of creep deformation and rupture behaviour of 1.0 1.0 INTRODUCTION I T TI 1.0 1.0 INTRODUCTION 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.009 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.com 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. To achieve higher plant efficiency and reduction in CO 2 e ission, there is a necessity of increase in temperature and pressure of boiler tube in the modern power plants. dvanced ltra super critical power plant aims to increase the efficiency by increasing the te perature ore than 923 and pressure ore than 30 Pa [ eitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades of austenitic SS) used in conventional power plant is not adequate. 304grades of stainless steel has been modified by adding 3wt pct. of Cu, increased carbon content and certain a ounts of niobium and nitrogen hich has good elevated te perature resistance and creep resistance, aterial na ed as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.com 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. To achieve higher plant efficiency and reduction in CO 2 emission, there is a necessity of increase in temperature and pressure of boiler tube in the modern power plants. Advanced Ultra super critical power plant aims to increase the efficiency by increasing the temperature more than 923K and pressure more than 30MPa [ Weitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades of austenitic SS) used in conventional power plant is not adequate. 304grades of stainless steel has been modified by adding 3wt pct. of Cu, increased carbon content and certain amounts of niobium and nitrogen which has good elevated temperature resistance and creep resistance, material named as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanh 2011.sahoo@gmail.com © 8 T ier .V. T is is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. To achieve higher plant efficiency and reduction in CO 2 emission, there is a necessity of increase in temperature and pressure of boiler tube in th modern power plants. Advanced Ultra super critical power plant aims to increase the efficiency by increasing the temperature more than 923K and pressure more tha 30MPa [ Weitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades of austenitic SS) used in conv nt onal power lan is not adequ te. 304grades of stainless st el has been modified by adding 3wt pct. of Cu, increased carbon content and certain amounts of niobium and nitrogen which has good elevated temperature resistance and creep resistance, material named as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.com 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-r view under responsibility of Peer-review under responsibility of the SICE 2018 organizers. To achieve higher plant efficiency and reduction in CO 2 emission, there is a necessity of increase in te perature and pressure of boiler tube in the modern power plants. Advanced Ultra super critical power plant ai s to increase the efficiency by increasing the te perature more than 923K and pressure more than 30MPa [ Weitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades of austenitic SS) used in conventional power plant is not adequate. 304grades of stainless steel has been modified by adding 3wt pct. of Cu, increased carbon content and certain amounts of niobium and nitrogen which has good elevated temperature resistance and creep resistance, material named as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.com 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. temperature but decrease was more pronounced at 923K. T product of steady stat cr ep rate and rupture life obeyed Monkman-Grant relation. The contribution of tertiary creep was found to increas with temperature. Microstructural degradation i the form of coarsen d precipit tes, dislocation cell formation and deformation bands was the primary reason for increase n t rtiary regime of reep curve and increase in the value of damage tolerance factor (λ). A mathematical model based on finite element analysis coupled with continuum damage mechanics has been used to predict the creep deformation and rupture if of 304HCu SS. The prediction of creep curve based on this model was found to be in good agreement with experimental results. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. 1.0 I T CTIO To achieve higher plant efficiency and reduction in C 2 e ission, there is a necessity of increase in te perature and pressure of boiler tube in the modern pow r plants. Advanced Ultra super critical power plant ai s to increase the efficiency by increasing the temp ature more than 923K and pressure ore than 30 Pa [ Weitzel P.S. ., 2011 ]. However, the elevated te perature resistance and creep resistance of the materi l (300grades of austenitic SS) used in conventional po er plant is not adequate. 304grades of stainless steel h s been odified by adding 3 t pct. of Cu, increased carbon content and c rtain a ounts of niobiu and nitrogen which has good elevated temperature resistance and creep resistance, aterial na ed as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.co 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 orga izers. Abstract R duction in CO 2 gas emission and decrease in fuel consumption can result in increase in efficiency of the thermal power plants. Increase in efficiency is directly linked to the steam temperature and pressure which requires materials having high creep strength. This resulted in evelopment of Advanc d Ultra Super Critical (AUSC) power plant which aims to i crease efficiency to more than 45 and significant decrease in CO 2 emission. The 304HCu stainless steel is one of the ca did t materials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitrogen and increased carbon content for enhancing creep strength. Creep tests are conducted for 304HCu stainless steel at 923K, 973K and 1023K ver a stress ra ge of 100-240MPa. The cr ep curve exhibited sh rt r prima y r gimes followed by marginal s condary regimes and extended tertiary regime. The variati n of steady state creep rate with appli d stress exhibited Norton’s power law relationship . The value of n (stress exponent) decreased with increase in temperature but decrease was more pronounced at 923K. The product of steady state creep rate and rupture life obeyed onkman-Grant relation. The ontrib tion of tertiary creep was found to increase with temperature. icrostructural degradation in the form of coarsened precipitates, dislocation cell formation and d formation ban s was the primary reas n for increase i tertiary regime of cr ep curve and increase in the value of damage tolerance factor (λ). A mathematical model based on finite lement analysis oupled with continuum damage mechanics has been used to predict the creep deformation and rupture life of 304HCu SS. The prediction of creep curve based on this model was found to be in good agreement with experimental results. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. 1.0 INTRODUCTION To achieve higher plant efficiency and reduction in CO 2 emission, there is a necessity of increase in te perature and pressure of boiler tube in the odern po er plants. dvanced ltra super critical po er plant ai s to increase the efficiency by incr asing the t ature more than 923 and pressure more t an 30MPa [ eitzel P.S. ., 2011 ]. o ever, the elevated te perature resistance and creep resistance of the aterial (300grades of austenitic SS) used in conventional power lant is not adequate. 304grades of stainless steel h s been modified by adding 3wt pct. of Cu, increased carbon con ent and c rtain a ounts of niobium and nitrogen hich has good elevated te perature resistance and c eep resis ance, material na ed a 304 C SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E- ail id- kanhu2011.sahoo g ail.com 2452-3216 © 2018 T Elsevier B.V. cle under the CC BY-NC-ND license (https://creativecommons.org/ /by-nc-nd/4.0/) Abstract e in fuel consumption ca result n plants. Increas efficiency is dir ctly linked to the st am temperature and p c e gth. This result d in development of Advanced Ultra Super Critical (AUSC) power plant which aims to i cre efficiency to more than 45 m copper, nd nitrogen a el at 923K, 973K and 1023K over a stress rang of 100-240 Pa. The creep curve exhibited short r p imary regim s l m tertiary regime. The variation of steady st t onounc 3 y l ob onkm n-G ant o e t p n ra degradation in th loc n for increase in ter iar increase in the v e tolerance factor (λ). A math matical model based on fi e ele s coupled with and rupture l dicti sults. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE ana 1 I T TI To chie er plant efficiency and reduction in 2 ission, there is a necessi of increase in t p nts. dvanced ltra super crit a s to incre se the efficiency by i creasing he t perature ore than 923 and pressure ore t n 30 P [ r i ( uate 304g been od fied by add ng 3 t pct. of u, increas on con t certain a f i b nd nitro which has good elevated te perature resistance and creep resistance, aterial na ed as 3 Corresponding author: Tel.: +91 44 27 2452-3216 © 2018 The Authors. Published by E sevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Abs ract Reduction in CO 2 gas emission and decrease in fuel consumption can result in increase i ffici cy of the thermal power plants. Increase in efficiency is irectly li ke to the steam temperature and pressur which equires mat rials havi g high creep str ngth. This resulted in dev lo ment of Advanced Ultra Super Critical (AUSC) power plant which aims to increase efficiency to more than 45 % an significant decre se in CO 2 mission. The 304HCu stainless steel is one of th c ndidate m terials to be used in AUSC power plant. It contains around 3 wt. % of copper, certain amounts of niobium and nitroge and increased carbon content for nha cing creep st ngth. Cre p tests are conduct d for 304HCu s ainless tee at 923K, 973K nd 1023K ov r a stress rang of 100-240MPa. The cr ep curve exhibited shor r p ima y regimes fo lowed by marginal seco da y regimes and extended tertiary regime. The variatio of steady state creep rate with appli d tress exhibited Norton’s power law relationship . T v lue of (stress expon t) decreased with increase in tempera ure bu decrease wa more pronounced at 923K. Th product of steady stat creep rate and rupture life obeyed Monkman-Grant relation. The c ntribution of tertiary creep was fou d to incr ase with temperature. Microstructural degradation in th form of coarsen d precipit tes, dislocation cell formation and deformation bands was the primary reason for increase in tertiary regime of cre p curve a d inc ase in the value of damage tolerance facto (λ). A math matical model based on finite element analysis coupled with continuum damage mechanics has been used to predict the creep d formation and rupture if of 304HCu SS. The prediction of creep curve bas d on this model was found to be in good agreement with experimental results. Keywords: 304HCu SS; reep; Continuum damage mechanics; FE analysis. 1.0 INTRODUCTION To achiev hig r plant efficiency and reduction in CO 2 emission, there is a necessity of increase in te perature and pressure of boiler tube in th mod rn power plants. Advanced Ultra super critical power plant aims to increase the efficiency by increasing the t mperature more than 923K and pressure more t n 30MPa [ Weitzel P.S. ., 2011 ]. However, the elevated temperature resistance and creep resistance of the material (300grades f austenitic SS) used in conventional power plant is not adequate. 304grades of stainless steel has been modified by adding 3wt pct. of Cu, increased carbon content and certain amounts of niobium and nitrogen which has good elevated temperature resistance and creep resistance, material named as 304HCu SS. * Corresponding author: Tel.: +91 44 27480500 Extn: 21210; Fax: +91 44 27480075, E-mail id- kanhu2011.sahoo@gmail.com © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. Keywords: 304HCu SS; Creep; Continuum damage mechanics; FE analysis. INTRODUCTION 1.0 INTRODUCTION * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt