Abstract
Inconel alloy-625 is one of the candidate materials for high-temperature bellows in sodium-cooled fast reactor (SFR) systems. Typical temperature in SFR systems is around 843 K at which failure modes such as creep and creep–fatigue interaction are significant. Viscoplastic analysis gives the combined strains due to fatigue including stress relaxation during hold time. This paper presents the estimation and validation of the parameters of Inconel alloy-625 for Chaboche and Rousselier viscoplastic constitutive model at 843 K. A set of low cycle fatigue and creep–fatigue interaction tests were carried out. The parameters defining the isotropic and kinematic hardening of the material were estimated from the LCF tests. The viscous parameters were estimated from the stress relaxation data obtained from the CFI tests. Validation of the parameters of the viscoplastic constitutive parameters was carried out by successfully predicting the hysteresis loops, and the stress relaxation behavior exhibited by the alloy.
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