Constitutive Modeling of High Temperature Uniaxial Responses of Alloy 617

摘要

Alloy 617 is a high temperature creep and corrosion resistant alloy that is a leading candidate for use in the Intermediate Heat Exchanger (IHX) of Next Generation Nuclear Plants (NGNPs). The IHX has an anticipated operating temperature of 800-950°C, which is within the creep regime of alloy 617. During start-up, operation, and shut-down of the reactor the IHX component will experience low-cycle fatigue loading. Furthermore, during operation, the IHX will be subjected to complex state of stresses and strains; the design for which will require a broad understanding of the mechanical behavior of alloy 617 at elevated temperatures. Very few investigations have been made into the low cycle fatigue-creep and ratcheting-creep response of alloy 617.