预制裂纹对等离子体淬火车轮材料磨损行为的影响  

Effect of Pre-cracks on Wear Behavior of Railway Wheel Material Quenched by Plasma

作　　者：李爽 张青松[1] 戴光泽[1] LI Shuang;ZHANG Qingsong;DAI Guangze(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学材料科学与工程学院,成都610031

出　　处：《材料导报》2022年第5期138-144,共7页Materials Reports

基　　金：中国铁路总公司科技研发计划(2016J007-H)。

摘　　要：利用层流等离子体射流对轮轨试样进行表面点状淬火处理,采用电火花加工方法在车轮试样表面预制裂纹,基于MJP-30滚动接触疲劳试验机进行磨损试验,研究了表面预制裂纹对车轮试样淬火前后磨损行为的影响。结果表明:预制裂纹导致未淬火车轮试样出现局部严重磨损区,其磨损量显著增加,而淬火试样的磨损量轻微增加;磨损试验后,预制裂纹在未淬火试样中闭合,而在淬火试样中不闭合;在淬火试样中,浅预制裂纹宽度扩大并在表层出现马氏体塑性变形和剥落现象,而深预制裂纹宽度略微收缩且表层无马氏体塑性变形与剥落现象;淬火试样的预制裂纹诱发大角度裂纹贯穿整个淬火区,并沿着淬火区与基体交界面扩展,显著增加了淬火区大块剥离的隐患。The surface of wheel and rail rollers was quenched by laminar plasma,and the pre-cracks were manufactured on the surface of wheel rollers.Based on rolling contact wear tests carried out on the MJP-30 test machine,the effect of pre-cracks on wear behavior of wheel rollers quenched by plasma was studied.The results show that the pre-cracks lead to severe wear zones in the part of untreated wheel rollers,increa-sing the mass loss of untreated rollers significantly,increasing the mass of quenched rollers slightly.The pre-cracks are closed in the untreated wheel rollers after wear.However,they are not closed in the quenched rollers.For the quenched wheel rollers,the width of shallow pre-crack expands with martensite plastic deformation and spalling of the surface,while the width of deep pre-crack shrinks slightly and there is no martensite plastic deformation or spalling of the surface.The pre-crack of quenched rollers induces large angle cracks throughout the quenched zone,and then they propagate along the interface between the quenched zone and the matrix,which significantly increases the block spalling risk of the quenched zone.

关 键 词：预制裂纹 车轮材料 等离子体淬火 磨损行为 裂纹扩展 

分 类 号：TH117.1[机械工程—机械设计及理论]