文献类型：期刊文献

英文题名：Influence of microstructure and microdefects on long-term fatigue behavior of a Cr-Mo-V steel

作者：Zhu, Ming-Liang[1];Xuan, Fu-Zhen[1];Chen, Jian[2]

机构：[1]E China Univ Sci & Technol, Sch Mech Engn, MOE, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Changsha Univ Sci & Technol, Coll Hunan Prov, Key Lab Efficient & Clean Energy Utilizat, Changsha 410114, Hunan, Peoples R China

年份：2012

卷号：546

起止页码：90

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20121714972559);WOS:【SCI-EXPANDED(收录号:WOS:000304296500013)】；

基金：The authors are grateful for the supports provided by National Natural Science Foundations of China (10972078) and the Natural Science Foundation of Shanghai (11JC1403200). Ming-Liang would also wish to thank the foundation of Key Laboratory of Efficient and Clean Energy Utilization, College of Hunan Province (2009NGQ002).

语种：英文

外文关键词：Very high cycle fatigue; Pore; Inclusion; Crack initiation; Welding joints

摘要：Very high cycle fatigue (VHCF) tests at 370 degrees C were carried out for a Cr-Mo-V steel to investigate the influence of microstructure and microdefects on fatigue behavior. Duplex S-N curves were obtained with the crack initiation switched from specimen surface to interior. A new elliptical type of fish-eye pattern originated from microstructure heterogeneities was observed. In the high cycle fatigue regime, the influence of microstructures on fatigue performance was greater than that of microdefects. In the VHCF regime, by contrast, the fatigue performance was dominated by inclusions and could be interpreted by using the proposed life controlling parameter Z. (C) 2012 Elsevier B.V. All rights reserved.