3301 Characterization of Crack Growth Life for Nickel-based Directionally Solidified Superalloy Under High Temperature Creep-fatigue Interactive Conditions Based on Catastrophic Concept

Abstract

The estimation of the effects of cycle and time dependent mechanisms on crack growth behavior are important from the view points of the estimation of mechanical performance of the material. In this study, high temperature creep-fatigue interactive tests were conducted for nickel-based directionally solidified superalloy. The characteristics of the effects of cycle and time dependent mechanisms on crack growth life under high temperature creep-fatigue interactive conditions were shown to have different properties between them. Furthermore, a theoretical analysis was conducted to represent these characteristics.