0Cr18Ni9不锈钢列车贮水箱点蚀与开裂原因分析  

ANALYSIS ON REASONS OF PITTING CORROSION AND CRACKING OF 0Cr18Ni9 STAINLESS STEEL USED IN WATER TANK OF TRAIN

作　　者：宫文彪[1] 孙焕焕[1] 王辉[1] 王相玉 

机构地区：[1]长春工业大学材料科学与工程学院,130012 [2]长春轨道客车有限公司,130062

出　　处：《焊接》2005年第2期17-19,共3页Welding & Joining

摘　　要：对不锈钢水箱发生的点蚀与开裂问题进行了分析,并模拟生产工况进行了试验研究。结果表明冷装配时带楞角铁锤敲击造成的表面凹坑处、焊接时飞溅与电弧擦伤处的电极电位发生了变化,促使了点蚀的发生;另外,HAZ的过热区也是点蚀最易发生的部位,并且点蚀发生部位也是应力腐蚀开裂的裂纹源。The problem of pitting corrosion and crack of stainless steel used in the water tank were studied by simulating service condition. Some pits were produced in the surface of the stainless steel owing to the rapping of the hammer with edge angle when carrying on cold assembly. The pitting corrosion occurred on the surface existing pits such as the welding spatter and arc scratch because of the changes of electrode potential. Moreover overheated HAZ were the location to the pitting corrosion. The pitting locations were often the cracking origin of stress corrosion crack.

关 键 词：点蚀 0CR18NI9 飞溅 不锈钢 裂纹源 模拟生产 焊接 列车 配时 敲击 

分 类 号：TG172[金属学及工艺—金属表面处理] TG174[金属学及工艺—金属学]