Fatigue crack growth behavior of spray formed GH738 alloy

被引：0
作者：
机构：
[1] School of Materials Science and Engineering, Harbin Institute of Technology
[2] National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology
[3] Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials
来源：
Sun, J.-F. (jfsun@hit.edu.cn) | 1600年 / Beijing Institute of Aeronautical Materials (BIAM)卷
关键词：
Fatigue crack growth; GH738; Spray formed;
D O I：
10.11868/j.issn.1001-4381.2014.07.011
中图分类号：
学科分类号：
摘要：
The fatigue crack growth tests of spray formed GH738 superalloy with compact tension (CT) specimens were carried out at different temperatures, loading frequency and R-ratios. The effects of temperatures, loading frequency and R-ratios on fatigue crack growth behaviors were investigated .The results show that the crack propagation rate increases with the increase of temperature; Fatigue crack propagation increases with the decrease of loading frequency; Fatigue crack growth rate da/dN is also found to increase with the larger R-ratios. The crack initiates multi-sites, and the fatigue fracture individually exhibits a series of fatigue striations mode in the crack steady growth region.
引用
收藏
页码：55 / 59
页数：4
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