Grain size effect on the small fatigue crack initiation and growth mechanisms of nickel-based superalloy GH4169

被引：92

作者：

Deng, Guo-Jian ^{[1
]}

Tu, Shan-Tung ^{[1
]}

Zhang, Xian-Cheng ^{[1
]}

Wang, Qiong-Qi ^{[1
]}

Qin, Cheng-Hua ^{[1
]}

机构：

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

来源：

ENGINEERING FRACTURE MECHANICS | 2015年 / 134卷

关键词：

Small crack; Fatigue; Replica; Grain size; GH4169; LOW-CYCLE FATIGUE; INCONEL; 718; BEHAVIOR; MICROSTRUCTURE; ALLOYS; TEMPERATURE; PROPAGATION; ALUMINUM; LIFE;

D O I：

10.1016/j.engfracmech.2015.01.002

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The aim of this paper was to identify the grain size effect on the small fatigue crack initiation and growth mechanisms of nickel-based superalloy GH4169. Results showed that there was a transition of fatigue crack initiation mechanism between fine-grained material and coarse-grained material. Small fatigue crack growth rates were almost constant across a wide range of crack lengths. Once the surface crack length reached the critical size of 200 mu m, the crack would propagate fairly quickly. At a given experimental condition, the scattering of fatigue lives of the parallel specimens was dependent on the crack initiation mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：433 / 450

页数：18

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