PSI - Issue 14

K.C. Sahoo et al. / Procedia Structural Integrity 14 (2019) 60–67 K.C. Sahoo et.al./ S ructural Integrity Procedia 00 (20 8) 0 0 – 00

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 The variation of time to onset with rupture life indicates contribution of tertiary creep increases with temperature which is due to mainly microstructural degradation as has been calculated through damage tolerance factor ‘λ’.  Creep strain and rupture life of the 304HCu SS s were very well predicted using the FE-analysis incorporating damage mechnics equations in the model .

Acknowledgement

The authors are thankful to Dr. A.K. Bhaduri, Director (IGCAR, Kalpakkam), and Dr. G. Amarendra, Director,,Metallurgy and Materials Group (IGCAR), Dr. Shaju K. Albert, associate director (MEG) and Dr. G. Sasikala, Head of MDTD for their keen interest in and support of this work. The authors also acknowledge the help received from Dr. V. D Vijayanand and V.Ganeshan. References: Weitzel, P.S., 2011. Steam generator for advanced ultra-supercritical power plants 700 to 760 0 C, Proc. ‘‘ASME ’’, Power Conf., pp. 1 -10 Masuyama. F., 2001. “ History of Power Plants and Progress in Heat Resistant Steels” ISIJ Int. 41 (6) 612 – 625 Laha K., Kyono, J. and Shinya, N., 2007. An advanced creep cavitation resistance Cu-containing 18Cr – 12Ni – Nb austenitic stainless steel Scripta Metall. Mater. , vol. 56, pp. 915 – 18. Kachanov, L. M., 1967.The theory of creep (ed. A. J. Kennedy); National Lending Library, Boston Spa Goyal S., Laha. K., Panneer Selvi S., & Mathew M. D. 2014., Mechanistic approach for prediction of creep deformation, damage and rupture life of different Cr – Mo ferritic steels, Materials at High Temperatures, 31:3, 211-220. Leckie, F.A., Hayhurst., D.R., 1977 Constitutive equations for creep rupture Acta Metall. 25 1059 – 1070. Semba, H., Dyson, B., and the late Malcolm McLean 2008. ‘Microstructure - based creep modelling of a 9%Cr martensitic steel’, Mater. High Temp.,, 25, (3), 131 – 137. Ashby, M.F., Dyson, B.F.,1984. Creep damage mechanics and micromechanics Eds. R. S. Valluri Advances in Fracture Research, vol. 1, Pergamon Press, Oxford, pp. 3 – 30. Dyson, B.F., Gibbons, T.B., 1987.Tertiary creep in Nickel base superalloys: Analysis of experimental data and theoretical synthesis Acta Metall. 35 2355 – 2369. Oruganti, R., Karadge, M., and Swaminathan S., 2011. ‘Damage mechanics -based creep model for 9 – 10% Cr ferritic steels’, Acta Met., , 59, 2145 – 2155. Christopher, J., Sainath, G., Srinivasan, V. S., Isaac Samuel, E., Choudhary, B. K., Mathew M. D. and Jayakumar, T., 2013. Continuum damage mechanics approach to predict creep behaviour of modified 9Cr- 1Mo ferritic steel at 873 K’, Proced. Eng., 55, 798 – 804.