文献类型：期刊文献

英文题名：The influence of stress-regime dependent creep model and ductility in the prediction of creep crack growth rate in Cr-Mo-V steel

作者：Zhang, J. W.[1];Wang, G. Z.[1];Xuan, F. Z.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Key Lab Pressurized Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2015

卷号：65

起止页码：644

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20145100348719);WOS:【SCI-EXPANDED(收录号:WOS:000345520000080)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51375165, 51325504).

语种：英文

外文关键词：Creep crack growth rate; Creep model; Creep ductility; Stress-regime; Chromium alloy steel

摘要：In this paper, the stress-regime dependent creep model and ductility have been implemented in a ductility exhaustion based damage model, and their influence on creep crack growth (CCG) behavior of materials have been analyzed. By using the stress-regime dependent creep model and ductility, the CCG rate in a Cr-Mo-V steel over a wide range of C* has been predicted by finite element analyses. The predicted CCG rates agree with the available experimental data in the literature. The analysis results show that with increasing C*, the creep model and ductility for determining crack-tip creep damage accumulation change from the low-stress regime model and ductility through a combination of low- and high-stress regime model and ductility to high-stress regime model and ductility. These changes lead to the line segments of the da/dt-C* curves. In CCG life analyses and designs of high temperature components, the stress-regime dependent creep model and ductility need to be used. (C) 2014 Elsevier Ltd. All rights reserved.