Law of fracture life under creep–fatigue interactive conditions for Ni-base directionally solidified superalloy based on non-equilibrium science (the effect of stress holding time)

Abstract

Ni-base directionally solidified superalloy are used under complex conditions of high temperature creep and fatigue interaction. Under these conditions, the characteristics of load frequency for fracture life show a nonlinear behavior, and these characteristics show various features depending on material, temperature and stress holding time.

In this study, crack growth tests were conducted under creep–fatigue interactive conditions with stress holding time, $t_{H}$ using the in-situ observational system for directionally solidified Ni-base superalloy CM247LC. To characterize the load frequency of fracture life for CM247LC, the separate estimation of cyclic dependent from time dependent mechanisms was conducted. Additionally, a developed representation of the characteristic of fracture life under the conditions of creep fatigue interaction based on non-equilibrium science and chaos theory was proposed. Furthermore, verification of the established law of predicting the fracture life under creep–fatigue interactive conditions was conducted.

Keywords

Ni-base directionally solidified superalloy fracture life non-equilibrium science creep–fatigue interactive condition

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