Small crack propagation and closure behaviours and mechanisms in a powder metallurgy superalloy at high temperature in air

被引：5
作者：
Yang, Qinzheng [1 ]
Zhao, Yi [1 ,2 ]
Hu, Xiaoan [1 ]
Yang, Xiaoguang [3 ]
Miao, Guolei [4 ]
Lu, Minghui [1 ]
Jia, Jie [1 ]
机构：
[1] Nanchang Hangkong Univ, Sch Aircraft Engn, Nanchang 330063, Peoples R China
[2] Equipment Dept China PLA AF, AF Armament Div, Beijing, Peoples R China
[3] Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China
[4] Chengdu Holy Grp Ind Co Ltd, Chengdu 610041, Sichuan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 175卷
关键词：
Small fatigue crack; Crack closure; Digital image correlation; Crack opening displacement; DIGITAL-IMAGE CORRELATION; STRESS INTENSITY FACTORS; LOW-CYCLE FATIGUE; NICKEL-BASED SUPERALLOY; GROWTH-BEHAVIOR; MICROSTRUCTURAL FEATURES; LIFE PREDICTION; INITIATION; PLASTICITY; MODES;
D O I：
10.1016/j.ijfatigue.2023.107797
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
To investigate small crack propagation and closure mechanisms in a powder metallurgy superalloy FGH4096 at room and high (600 degrees C) temperatures in air, meso-scale digital image correlation (DIC) was applied. CODs of small cracks did not increase monotonically as cracks propagated, which was related to the potential role of subsurface crack morphology. Roughness induced crack closure was found to be the leading mechanism at times. Oxidation induced crack closure was negligible at 600 degrees C, resulting from the oxidation-resistance of FGH4096. Crack opening stress intensity factors were generally higher at 600 degrees C, which ascribed to the higher level of plasticity induced crack closure.
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页数：14
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