文献类型：期刊文献

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

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

年份：2015

卷号：134

起止页码：433

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20150600492182);WOS:【SCI-EXPANDED(收录号:WOS:000348581600026)】；

基金：The authors are grateful for the support by National Natural Science Foundations of China (51175177, 51371082, 51322510). X.C. Zhang is also grateful for the support by New Century Excellent Talents in University (NCET-11-0643) and Shanghai Pujiang Program and Key Research Program of Shanghai Science and Technology Committee (13DJ1400200).

语种：英文

外文关键词：Small crack; Fatigue; Replica; Grain size; GH4169

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.