钢轨U75V表层激光淬火强化性能  

Research on Laser Quenching Performance of Rail U75V Surface

作　　者：钟立明 张书生 Zhong Liming;Zhang Shusheng(Industrial Robot BG,Siasun Robot&Automation Co.Ltd.,Shenyang,Liaoning 110167,China)

机构地区：[1]沈阳新松机器人自动化股份有限公司工业机器人BG,辽宁沈阳110167

出　　处：《应用激光》2022年第10期106-110,共5页Applied Laser

摘　　要：采用光纤激光对钢轨用材U75V表层进行激光淬火强化,去除表面氧化皮强化后的钢轨试件表面平整度与强化前无差别。钢轨试件有氧化皮部分激光热源作用中心位置淬火深度最深,约为1 mm。中心位置为非常细小的针状马氏体组织,搭接位置激光二次淬火强化区晶粒会再次细化,后一道对前一道热作用明显,会产生粗大的残余奥氏体组织。钢轨U75V激光淬火强化硬度高达850 HV左右,淬火强化效果明显。In this paper, fiber laser is used to laser quench the surface layer of rail material U75 V. The surface flatness of the rail specimen after laser quenching is no different from that before quenching. The quenching depth at the center of the laser heat source is the deepest, about 1 mm. The center position is a very fine acicular martensite structure, at the overlapping position. The grains in the laser secondary quenching zone will be refined again. The latter pass has an obvious thermal effect on the former pass, resulting in a coarse retained austenite structure. The U75 V laser quenching hardness of the rail is as high as about 850 HV, the effect of hardness improvement is obvious.

关 键 词：U75V 激光淬火强化 显微组织 硬度 

分 类 号：TG456[金属学及工艺—焊接]