Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650℃

被引：18

作者：

Xumin Zhu ^{[1
]}

Congyang Gong ^{[1
,2
]}

Yun-Fei Jia ^{[1
]}

Runzi Wang ^{[1
]}

Chengcheng Zhang ^{[2
]}

Yao Fu ^{[1
]}

Shan-Tung Tu ^{[1
]}

Xian-Cheng Zhang ^{[1
,2
]}

机构：

[1] Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology

[2] AECC Commercial Aircraft Engine Co.LTD,Shanghai Engineering Research Center for Commercial Aircraft Engine

来源：

Journal of Materials Science & Technology | 2019年 / 35卷 / 08期

关键词：

Fatigue crack initiation; Small crack; Crack growth rate; Grain size effect; High temperature;

D O I：

暂无

中图分类号：

TG132.3 [特种热性质合金];

学科分类号：

080502 ;

摘要：

GH4169 at 650℃ in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size.

引用

页码：1607 / 1617

页数：11

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