Cyclic plasticity modeling of nickel-based superalloy Inconel 718 under multi-axial thermo-mechanical fatigue loading conditions.

Highlights • Introduced a new constitutive model for thermo-mechanical cyclic plasticity. • Describing the complex hardening behavior by kinematic and isotropic hardening. • Using Tanaka factor to describe non-proportional hardening under multiaxial loading. • Representing thermo-mechanical behavior by parameters from isothermal tests. Abstract High temperature components work mainly under thermo-mechanical loading conditions. Recent investigations reveal significant effects of the thermo-mechanical coupling on material behavior. In the present work, extensive experiments are performed for nickel-based superalloy Inconel 718 under both isothermal and thermo-mechanical loading conditions. Within the framework of the Ohno-Wang cyclic plasticity, a modified constitutive model is suggested to describe cyclic hardening/softening, non-proportional hardening, non-masing effects observed in the experiments. The implicit integration algorithm is developed and implemented into a commercial finite element code. Comparison between experiments and computations confirms that the suggested model can predict the cyclic plastic behavior under most different varying temperatures and multi-axial loading paths reasonably. [ABSTRACT FROM AUTHOR]