The effect of grain size and anomalous shape on low cycle fatigue of nickel-based superalloy at elevated temperature

被引：6

作者：

Tian, Qiang ^{[1
]}

Qin, He-Yong ^{[1
]}

He, Jingjing ^{[2
]}

Guan, Xuefei ^{[3
]}

机构：

[1] Cent Iron & Steel Res Inst Co Ltd, Beijing 100081, Peoples R China

[2] Beihang Univ, Sch Reliabil & Syst Engn, Beijing 100191, Peoples R China

[3] China Acad Engn Phys, Grad Sch, Beijing 100193, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2024年 / 188卷

基金：

中国国家自然科学基金;

关键词：

Low cycle fatigue; Nickel-based superalloy; Grain size; Anomalous shape; Cyclic deformation; CRACK INITIATION; CRYSTAL ORIENTATIONS; MICROSTRUCTURE; LIFE; DEFORMATION; PROPAGATION; BEHAVIOR; GROWTH; GH4169;

D O I：

10.1016/j.ijfatigue.2024.108526

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The effect of grain size and shape on low cycle fatigue of a nickel-based superalloy at elevated temperature was investigated. Fatigue testing was performed using GH4742 specimens having fine, coarse, and irregular grains. The fine-grained material exhibits a transition strain separating the fatigue life diagram into two regimes with distinct slopes while the other two do not. A piecewise log-linear model was proposed to incorporate the transition strain, yielding more accurate predictions. Crack initiation modes and cyclic deformations at half-life were investigated to explain the observed difference and fatigue behavior characteristics of the three grain types.

引用

页数：18

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