文献类型：期刊文献

英文题名：Effects of Stress Level and Stress State on Creep Ductility: Evaluation of Different Models

作者：Wen, Jian-Feng[1,2];Tu, Shan-Tung[1];Xuan, Fu-Zhen[1];Zhang, Xue-Wei[1];Gao, Xin-Lin[3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA;[3]Southern Methodist Univ, Dept Mech Engn, Dallas, TX 75275 USA

年份：2016

卷号：32

期号：8

起止页码：695

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20162402498751);WOS:【SCI-EXPANDED(收录号:WOS:000380845800001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 11472105 and 51505149) and the "111 project". The first author wishes to thank the financial support provided by Shanghai Sailing Program (Grant No. 15YF1402900). Careful check conducted by Dr. Imran Khan at Bhabha Atomic Research Centre is also greatly appreciated.

语种：英文

外文关键词：Creep; Creep ductility; Multiaxial stress state; Ductility exhaustion

摘要：The last few decades have witnessed an increasing emphasis on the development of strain-based approach for predicting the creep life or damage of components operating at elevated temperatures. Creep ductility, as a key parameter in this approach, may vary with a number of factors including strain rate, state of stress, operating temperature, material microstructure, etc. The present paper, however, is focused on reviewing the state-of-the-art understanding of the effects of stress level and stress state on the creep ductility. Mechanisms involving the void growth and coalescence are presented to describe the role of stress level in the variation of uniaxial creep ductility. The prediction capacity of existing empirical ductility models is also assessed in light of uniaxial test data. On the other hand, a vast body of multiaxial creep test data, collected from open literature, is utilized to examine the influence of the state of stress on the creep ductility. Then, a variety of multiaxial ductility factor models are introduced and evaluated with the available experimental data. Finally, a brief discussion on the dependence of creep ductility on the stress triaxiality and Lode parameter, predicted by numerical methods, is provided. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.