文献类型：期刊文献

英文题名：Pitting Corrosion and Stress Corrosion Cracking around Heat Affected Zone in Welded Joint of CrNiMoV Rotor Steel in Chloridized High Temperature Water

作者：Luo, L.H.[1]; Huang, Y.H.[1]; Xuan, F.Z.[1]

机构：[1] Key Laboratory of Safety Science of Pressurized System, MOE, School of Mechanical Engineering, East China University of Science and Technology, 130, Meilong Street, Shanghai, 200237, China

年份：2015

卷号：130

起止页码：1190

外文期刊名：Procedia Engineering

收录：EI(收录号：20161502237387)

语种：英文

外文关键词：Chromium alloys - Steam turbines - Steel corrosion - Molybdenum alloys - Pitting - Plastic deformation - Stress corrosion cracking - Residual stresses - Welded steel structures - Ternary alloys - Cracks - Heat affected zone - Weld decay - Corrosion fatigue

摘要：Pitting corrosion and stress corrosion cracking around heat affected zone of 25Cr2Ni2MoV rotor steel welded joint in chloridized high temperature water were studied by using U-bend specimen exposure test and electrochemical test. Different corrosion potentials were detected in various zones of welded joint with the order: heat affected zone > base metal > weld metal. By contrast, a reversed order was observed for pit density in welded joint which was partly ascribed to the galvanic effect of different zones. Stress corrosion cracks initiated from pits preferentially at the fusion line was observed because of its most complicated microstructure and highest hardness. A finite element analysis was carried out to evaluate the plastic strain distribution on the U-bend specimen. A great leap of the plastic strain from the weld to the fusion line could also explain the significant susceptibility to stress corrosion cracking at the fusion line. ? 2015 The Authors.