文献类型：期刊文献

英文题名：In Situ Observation of Small Crack Growth and Fatigue Life Modeling for In713C Ni-Based Superalloy

作者：Li, Xiao-Long[1];Liu, Yu-Ke[1];Wang, Zi-Wei[1];Chen, Rong[1];Zhu, Ming-Liang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China

年份：2025

卷号：48

期号：6

起止页码：2774

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：;EI(收录号：20251418164144);WOS:【SCI-EXPANDED(收录号:WOS:001458171000001)】；

基金：This work was supported by the Innovation Program of Shanghai Municipal Education Commission (No. 2023ZKZD42), the Natural Science Foundation of China (No. 52405155), and the China Postdoctoral Science Foundation (No. 2023M741172).

语种：英文

外文关键词：growth rate; life prediction; microstructurally small crack; microstructure

摘要：Fatigue failure has a considerable impact on the safety of equipment in service. The fatigue crack growth behavior of a Ni-based superalloy was investigated by in situ fatigue testing. The results showed that microstructurally small crack growth speed followed a "V-shaped" pattern. Notch effect activated multiple slip systems, and small cracks within grains tended to grow along slip bands parallel with {111} planes. Moreover, due to obstructive effects of cross-slip, grain boundaries, and carbides, the growth path was deflected. During this process, plastic deformation at the crack tip caused grains to rotate, with angular changes ranging from 6 degrees to 10 degrees. Finally, based on the fatigue crack growth mechanism, models for microstructurally small and long crack growth rates to predict the high-cycle/very-high-cycle fatigue life were established. The predicted results were within factors of three for surface failure and two for interior failure.