文献类型：期刊文献

英文题名：Transitional behavior of fatigue crack growth in welded joint of 25Cr2Ni2MoV steel

作者：Du, Yan-Nan[1];Zhu, Ming-Liang[1];Xuan, Fu-Zhen[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2015

卷号：144

起止页码：1

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20152701003594);WOS:【SCI-EXPANDED(收录号:WOS:000359319300001)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (51325504, 51205131), the Natural Science Foundation of Shanghai (12ZR1442900), and the Specialized Research Fund for the Doctoral Program of Higher Education (20120074120010).

语种：英文

外文关键词：Transition point; Fatigue crack growth; Microstructure; Load ratio; Welded joint

摘要：Transitional behavior of fatigue crack growth is observed for initial notches located at base metal, weld metal and heat-affected zone of 25Cr2Ni2MoV steel welded joint. Results indicate that both microstructures and load ratio R contribute to the transition. Greater roughness at both weld metal and base metal indicates a more pronounced roughness-induced crack closure in the near-threshold regime than that at heat-affected zone, especially at lower R. This transition is dominated by both Delta K and K-max which depends on R. An estimation of Delta K at transition point is proposed, which agrees fairly well with the experimental data. (C) 2015 Elsevier Ltd. All rights reserved.