文献类型：期刊文献

英文题名：Temperature dependence of very high cycle fatigue behavior and life modeling for In713C Ni-based superalloy

作者：Li, Xiao-Long[1];Zhu, Ming-Liang[1];Zhu, Peng-Bo[1];Wang, Zi-Wei[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2025

卷号：36

起止页码：8448

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20255219792974);WOS:【SCI-EXPANDED(收录号:WOS:001498364700004)】；

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

语种：英文

外文关键词：Very high cycle fatigue; Dislocation movement; Ni-based superalloy; Interior crack initiation; Life prediction modeling

摘要：Microstructures of polycrystalline materials under elevated temperature plays a crucial role in determining the fatigue performance of mechanical structures. In this study, tension-tension fatigue tests at 25 degrees C, 750 degrees C and 1000 degrees C were performed respectively to investigate the effect of microstructure on high-cycle/very-high-cycle fatigue behavior of a Ni-based superalloy. The results showed that fatigue life peaked at 750 degrees C due to dislocation entanglement and pinning effect. Microcracks were preferentially nucleated at high-angle grain boundary in coarse-grained regions, assisted by defects and slip in adjacent grains. Microstructural interaction was found temperature dependent: (i) ry ' phase sheared with stacking fault and antiphase boundary at 25 degrees C, (ii) ry/ry ' interface sliding controlled by Orowan looping at 750 degrees C, and (iii) ry matrix channel failure was induced by plastic instability through dislocation climbing at 1000 degrees C. Finally, an energy-based model for predicting crack initiation life was established by considering the critical resolved shear stress of the ry ' phase with favorable accuracy.