文献类型：期刊文献

英文题名：Correlation of local strain with microstructures around fusion zone of a Cr-Ni-Mo-V steel welded joint

作者：Wang, De-Qiang[1];Zhu, Ming-Liang[1];Xuan, Fu-Zhen[1]

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

年份：2017

卷号：685

起止页码：205

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

收录：;EI(收录号：20170203236595);WOS:【SCI-EXPANDED(收录号:WOS:000394190400025)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (Nos. 51575182 and 51325504).

语种：英文

外文关键词：Strain measurement; Digital image correlation; Welded joint; Local strain

摘要：In this paper, in-situ SEM images with both low and high resolution near fusion line of a Cr-Ni-Mo-V steel welded joint were taken during interrupted monotonic tensile tests, with which macro- and micro-strain were measured based on digital image correlation technique and correlated with microstructures. An error analysis of strain measurement indicated sufficient resolution for image correlation with intrinsic microstructures as speckles. Results from digital image correlation showed that base metal, heat-affected zone and weld metal of the welds exhibited different responses to external tensile loading with mismatched strain distribution. A transfer of strain localisation from tempered martensites at base metal to lathy bainites at weld metal was observed around the fusion zone, due to varied hardening capabilities among non-homogeneous microstructures. Micro-strain could be several times higher than macro-strain at the same strained area, implying severe non-uniform deformation at microstructural scale. The most straining zone around the fusion line was found to be localized at blocks of soft delta-ferrites.