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材料导报  2022, Vol. 36 Issue (5): 20120250-7    https://doi.org/10.11896/cldb.20120250
  金属与金属基复合材料 |
预制裂纹对等离子体淬火车轮材料磨损行为的影响
李爽, 张青松, 戴光泽
西南交通大学材料科学与工程学院,成都 610031
Effect of Pre-cracks on Wear Behavior of Railway Wheel Material Quenched by Plasma
LI Shuang, ZHANG Qingsong, DAI Guangze
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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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。
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李爽
张青松
戴光泽
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    
Abstract: 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.
Key words:  pre-crack    wheel material    plasma quenching    wear behavior    crack propagation
出版日期:  2022-03-10      发布日期:  2022-03-08
ZTFLH:  TH117.1  
基金资助: 中国铁路总公司科技研发计划(2016J007-H)
通讯作者:  g.dai@163.com   
作者简介:  李爽,2018年6月毕业于西南交通大学,获得工学学士学位。2018年9月至今,在西南交通大学攻读硕士学位,主要从事轮轨材料表面强化领域的研究。
戴光泽,西南交通大学材料科学与工程学院,教授。1998年毕业于日本京都工艺纤维大学,获工学博士学位。1999年12月加入西南交通大学材料科学与工程学院至今,主要从事材料服役行为及强度评价等领域的研究。
引用本文:    
李爽, 张青松, 戴光泽. 预制裂纹对等离子体淬火车轮材料磨损行为的影响[J]. 材料导报, 2022, 36(5): 20120250-7.
LI Shuang, ZHANG Qingsong, DAI Guangze. Effect of Pre-cracks on Wear Behavior of Railway Wheel Material Quenched by Plasma. Materials Reports, 2022, 36(5): 20120250-7.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20120250  或          http://www.mater-rep.com/CN/Y2022/V36/I5/20120250
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