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

被引：79
|
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
收藏
页码：433 / 450
页数：18
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