文献类型：期刊文献

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

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

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, Shanghai 200237, China;[2]AECC Commercial Aircraft Engine Co. LTD, Shanghai Engineering Research Center for Commercial Aircraft Engine, Shanghai 201108, China

年份：2019

卷号：35

期号：8

起止页码：1607

中文期刊名：Journal of Materials Science & Technology

外文期刊名：材料科学技术（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2019_2020】；

基金：ffinancially supported by the National Natural Science Foundations of China (Nos. 51725503, 51605164 and 51575183);the 111 project;support by Shanghai Technology Innovation Program of SHEITC (No. CXY-2015-001);Fok Ying Tung Education Foundation;support by Shanghai Sailing Program (No. 16YF1402300);Shanghai Chenguang Program (No. 16CG34).

语种：英文

中文关键词：Fatigue;crack;initiation;Small;crack;Crack;growth;rate;Grain;size;effect;High;temperature

外文关键词：Fatigue crack initiation;Small crack;Crack growth rate;Grain size effect;High temperature

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.
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.