Fatigue Crack Growth Behavior of Spray Formed GH738 Alloy
YANG Dong-ye1,2,3, CAO Fu-yang1,2, XU Wen-yong3, ZUO Xin1,2, LI Zhou3, ZHANG Guo-qing3, SUN Jian-fei1,2
1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;
3. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
Abstract: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.
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