A nonlinear kinetic rate model for unifying fatigue crack growth rates of nickel-based superalloys at room and elevated temperatures

被引：1
|
作者：
He, Jingjing [1 ]
Tian, Qiang [2 ]
Guan, Xuefei [3 ]
机构：
[1] Beihang Univ, Sch Reliabil & Syst Engn, Beijing 100191, Peoples R China
[2] Cent Iron & Steel Res Inst, High Temp Mat Res Div, Beijing 100081, Peoples R China
[3] China Acad Engn Phys, Grad Sch, Beijing 100193, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2024年 / 181卷
基金：
中国国家自然科学基金;
关键词：
Nonlinear kinetic rate; Fatigue crack growth rate; Temperature effect; Nickel-based superalloy; Arrhenius model; OXIDATION BEHAVIOR; 500-700-DEGREES-C; MICROSTRUCTURE; ORIENTATION; FREQUENCY;
D O I：
10.1016/j.ijfatigue.2023.108127
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This study presents a nonlinear kinetic rate model to describe the temperature-dependence of fatigue crack growth rate (FCGR) of nickel-based superalloys across a wide range (20 to 650(degrees)C). FCGR testing was performed using compact tension specimens of GH4742 superalloy. Metallography analysis on crack growth paths of two tested specimens suggests there is a local resistance to pure model I cracking at 20(degrees)C, which can greatly be weakened at 650(degrees)C. Compared to the classical Arrhenius equation, the proposed model captures the nonlinear temperature-dependence, and yields more accurate results by reducing the scatter factor from 5 to 3.
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页数：16
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