Failure mechanism and life correlation of Inconel 718 in high and very high cycle fatigue regimes

被引：11
|
作者：
Yang, Yi-Fan [1 ]
Hu, Hua-Yan [2 ]
Min, Lin [1 ]
Sun, Qian-Tao [1 ]
Song, Miao [2 ]
Zhu, Ming-Liang [1 ]
Wen, Jian-Feng [1 ,3 ]
Tu, Shan-Tung [1 ,3 ]
机构：
[1] East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China
[3] Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 175卷
基金：
中国国家自然科学基金;
关键词：
Inconel; 718; Very high cycle fatigue; Fatigue crack initiation; Transmission electron microscopy; Fatigue life; NICKEL-BASED SUPERALLOY; SUBSURFACE CRACK INITIATION; HIGH-STRENGTH STEELS; DISLOCATION CHANNEL; GRAIN-SIZE; ALLOY; BEHAVIOR; MICROSTRUCTURE; INCLUSION; FRACTURE;
D O I：
10.1016/j.ijfatigue.2023.107764
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
High and very high cycle fatigue (HCF and VHCF) behaviours and failure mechanism of Inconel 718 were investigated via ultrasonic fatigue tests and microscopic characterization techniques. It is shown that the S-N curve continuously decreases in the HCF regime, while forming a plateau for VHCF. Cracks initiate from a single site on the surface or subsurface. Site-specific focused ion beam sampling and transmission electron microscopy characterization reveal that the crack initiation is governed by slip-induced localized plastic deformation. Microcracks initiate near non-metallic inclusions or slip band-grain boundary site. Plus, a life correlation model considering the size of micro-defect was proposed to better correlate the fatigue life.
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收藏
页数：13
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