U71Mn重轨裂纹分析  

Crack Analysis on U71Mn Heavy Rail

作　　者：张彦文[1] 许竹桃[1] 张友登[1] 陶勇[2] 

机构地区：[1]武钢研究院,湖北武汉430080 [2]武钢质检中心,湖北武汉430080

出　　处：《热加工工艺》2014年第15期228-230,共3页Hot Working Technology

摘　　要：U71Mn重轨在安装使用半年后现场探伤时发现裂纹。通过现场取样,运用宏观及微观分析方法,对重轨裂纹进行了分析。结果表明:裂纹起源于重轨闪光对焊余高根部裂隙,并在工作应力作用下不断扩展。通过改善焊接接头余高形状,使其为圆弧过渡可有效防止此类问题的发生。A crack of U71Mn heavy rail was found when it was used for less than half a year. By sampling on the spot whcre the cracked raill works, the cracked rail was analyzed by macroscopical observation and examination. It shows that the crack comes from the root of weld reinforcement of flash butt welding and the crack expands through stress concentration. This kind of problem can be resolved by making the weld reinforcement shape, such as arc transition.

关 键 词：重轨 闪光对焊 焊缝余高 裂纹 断裂源 应力集中 

分 类 号：TG441.7[金属学及工艺—焊接]