文献类型：期刊文献

英文题名：Enhanced Galvanic Corrosion Phenomenon in the Welded Joint of NiCrMoV Steel by Low-Cycle Fatigue Behavior

作者：Weng, S.[1];Huang, Y. H.[2];Xuan, F. Z.[2];Zheng, S. L.[1,3]

机构：[1]Univ Shanghai Sci & Technol, Sch Mech Engn, Shanghai 200093, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[3]Machinery Ind Key Lab Mech Strength & Reliabil Ev, Shanghai 200093, Peoples R China

年份：2019

卷号：166

期号：12

起止页码：C270

外文期刊名：JOURNAL OF THE ELECTROCHEMICAL SOCIETY

收录：;EI(收录号：20194307567570);WOS:【SCI-EXPANDED(收录号:WOS:000474724700001)】；

基金：The work was sponsored by the National Natural Science Foundation of China (grant No. 51835503 and 51875202) and Shanghai Sailing Program (19YF1434400).

语种：英文

外文关键词：High resolution transmission electron microscopy - Chlorine compounds - Corrosion resistance - Welded steel structures - Galvanic corrosion - Steel corrosion - Welding - Chromium steel - Scanning electron microscopy - Fatigue testing - Low-cycle fatigue - Chromium alloys - Metals - Molybdenum alloys

摘要：The effect of microstructural changes on the corrosion of a NiCrMoV steel welded joint induced by low-cycle fatigue behavior in chloride solution has been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), potentiodynamic polarization curve tests and scanning vibrating electrode technique (SVET) tests. During the low-cycle fatigue tests, cyclic softening takes place in the three zones (base metal, BM/weld metal, WM/heat affected zone, HAZ) of the welded joint due to the decrease of dislocation density or the formation of low-energy structures. Compared to the as-received specimens, the corrosion potential of each zone in the low-cycle fatigue damage specimens moves to the positive direction and the corrosion current density decreases. The corrosion resistance of the individual zone increases, which is related to the reduction of dislocation density or the formation of low-energy structures. However, the difference of corrosion potential between base metal and weld metal in the lowcycle fatigue welded joints becomes lager, which means that the galvanic corrosion susceptibility of the low-cycle fatigue welded joint increases. This may be caused by the difference of microstructural changes in the various regions of welded joints during cyclic plastic deformation. (C) 2019 The Electrochemical Society.