Cyclic viscoplastic deformation modeling of a nickel-based single crystal superalloy with [001] orientation

¹ School of Energy and Power Engineering, Beihang University, Beijing 100191, China
² Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China
³ Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
⁴ AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
⁵ Aero Engine Corporation of China, Beijing 101304, China

^* Corresponding author: hdy@buaa.edu.cn

Abstract

Accurate simulations of cyclic viscoplastic deformation behaviors of single crystal superalloys which are widely used for the manufacture of gas turbine blades are important for the effective design and safety assessment in practice. In this context, based on the in-phase thermomechanical fatigue (IP TMF) and out-of-phase thermomechanical fatigue (OP TMF) experiments of the nickel-based single crystal superalloy with [001] orientation, a modified constitutive model has been developed to describe the deformation behavior under thermomechanical loadings. The TMF experiment results indicate that stable hysteresis loops with remarkable ratcheting appear in both IP TMF and OP TMF. And it’s worth noticing that the ratcheting growth direction of IP TMF and OP TMF are opposite. By introducing a Schmid stress rate related term to the back stress evolution equation, the slip-based Walker’s constitutive model is modified in this study. And the simulation results of the deformation behavior reveal good agreement with the experiments under different IP TMF and OP TMF conditions.