文献类型：期刊文献

英文题名：Effect of surface nanocrystallization on stress corrosion cracking of SS400 welded joint

作者：Li, Dong[1]; Chen, Huaining[2]; Xu, Hong[1]

机构：[1] State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

年份：2009

卷号：30

期号：3

起止页码：65

外文期刊名：Hanjie Xuebao/Transactions of the China Welding Institution

收录：EI(收录号：20091812064419)

语种：英文

外文关键词：Strain rate - Surface defects - Surface stress - Nanocrystals - Welds - Residual stresses - Steel corrosion - Cracks - Shot peening - Welding - Calcium compounds - High resolution transmission electron microscopy - Welded steel structures

摘要：A nanostructured surface layer was fabricated by means of high energy shot peening (HESP) on SS400 steel welded by metal active gas welding process. The refined microstructure in the top surface layer was characterized with transmission electron microscopy, and the residual stress was examined with XRD at the same time. Experimental results show that after the HESP treatment the coarse grains of the surface layer may be refined down into -10 nm scale, and the compressive residual stress on the surface layer be induced. The results of low strain rate tensile experiment of SS400 steel welded joint in solution (Ca(NO3)2 57%+NH4NO3 3%) at 983C indicate that the resistance of SS400 steel welded joint to stress corrosion cracking (SCC) has been enhanced. The enhancement may be attributed to the combined influences of nanostructured surface layer, compressive residual stress and eliminating micro-defect in welded joint of SS400 steel.