Stress Corrosion Cracking of NiCrMoV Steel Welded Joint under Applied Load in Simulated Environment of Low Pressure Nuclear Steam Turbine

摘要：

　　In order to determine the stress corrosion cracking susceptibility of NiCrMoV steel welded joint of low pressure nuclear steam turbine,long time immersion tests had been carried out in the form of cylindrical tensile specimens self-loaded to various applied load (0,0.3YS,0.6YS and 0.9YS) and exposed in the simulated environment with 180℃,3.5% NaCl.Coarsen grain heat affected zone reacted preferentially as anode in welded joint,which was caused by the synthetic effects of micro-galvanic corrosion,much more precipitations of carbides and higher content of Cr element.Preferential local corrosion of coarsen grain heat affected zone with the formation of occluded corrosion cell accelerated corrosion rate.In addition,the dissolution rate also increased as the applied load increased.

关键词： (1) long time immersion test (2) self-loaded cylindrical tensile specimens (3) applied load (4) stress corrosion cracking (5) micro-galvanic corrosion (6) occluded corrosion cell

作者: Shuo Weng Yuhui Huang Fuzhen Xuan Linghua Luo

作者单位: Key Laboratory of Safety Science of Pressurized System,MOE,School of Mechanical Engineering,East China University of Science and Technology,130,Meilong Street,PO Box 402,Shanghai 200237,PR China

会议类型: 国际会议

会议名称: 2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)

会议地点: 天津

会议语种:英文

页码: 361-365

在线出版日期: 2016-05-26（万方平台首次上网日期，不代表论文的发表时间）