文献类型：期刊文献

英文题名：Effect of microstructure on strain hardening and strength distributions along a Cr-Ni-Mo-V steel welded joint

作者：Zhu, Ming-Liang[1];Xuan, Fu-Zhen[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：65

起止页码：707

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20145100348714);WOS:【SCI-EXPANDED(收录号:WOS:000345520000087)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (51205131) and Natural Science Foundation of Shanghai (12ZR1442900). Ming-Liang Zhu would also appreciate the support from Chen Guang Project (12CG33) by Shanghai Municipal Education Commission and Shanghai Education Development Foundation.

语种：英文

外文关键词：Strain hardening exponent; Hardening stage; Strength prediction; Welded joint

摘要：Micro-tensile tests based on small-scale specimens were carried out to investigate the microstructure dependence of strain hardening behavior along a Ni-Cr-Mo-V steel welded joint. Results indicated the weld metal (WM) had higher tensile strength but lower strain hardening exponent than base metal (BM), whereas a gradient distribution of strain hardening exponents was observed within the heat-affected zone (HAZ). Bainitic microstructures showed weaker strain hardening capacity than lathy martensites. A Kocks-Mecking type plot of strain hardening rate versus true stress presented at least two hardening stages (stages III and IV) with varied duration along the whole welds. Larger grain size and more lathy martensites were beneficial to prolong the hardening period. A new strength prediction model was developed by considering the size effect on tensile strength. The predicted strength distributions along the welds were in good agreement with experimental data. (C) 2014 Elsevier Ltd. All rights reserved.