摘要
以在我国西北风沙环境下运行1.73×10^(6)km的动车组动车和拖车ER8钢车轮轮毂为研究对象,通过硬度测试、表面和截面损伤形貌观察等方法,分析了动车和拖车车轮轮毂表面的微动损伤行为。结果表明:动车车轮轮毂表面平均硬度约为335 HV,硬化层深度约为300μm,最大塑性变形层厚度约为29μm,均大于拖车车轮轮毂(310 HV,250μm,25μm);拖车车轮轮毂表面损伤以相互交错的浅犁沟为主,同时存在较多连片的剥落坑和疲劳裂纹,并发生氧化磨损,截面损伤以剥落为主,部分区域还存在小角度的长裂纹;动车车轮轮毂表面损伤主要为方向一致的深犁沟和少量大剥落坑,表面疲劳裂纹较少,截面损伤以小角度长裂纹为主,部分区域表层存在沿塑性变形线向内部扩展的裂纹。
By taking ER8 steel wheel hubs of motor car and trailer of an electric motor train unit operating 1.73×10^(6)km in a windy and sandy environment in northwest China as the research object,the fretting damage behaviors of wheel hub surface of motor car and trailer were analyzed by hardness testing and surface and section damage morphology observation.The results show that the average surface hardness,hardening layer depth and maximum plastic deformation layer thickness of the motor car wheel hub were about 335 HV,300μm and 29μm,respectively,which were greater than 310 HV,250μm and 25μm of the trailer wheel hub.The surface damage of the trailer wheel hub was mainly interlaced shallow furrows;there were many continuous spalling pits and fatigue cracks,and oxidative wear occurred.The section damage of the trailer wheel hub was mainly spalling pits,and there were small-angle long cracks in some areas.The surface damage of the motor car wheel hub was mainly deep furrows in the same direction and a small number of large spalling pits,and there were few surface fatigue cracks;the section damage was mainly long cracks with small angles,and there were cracks propagating inward along the plastic deformation lines on a partial region suface layer.
作者
何成刚
邹港
叶榕伟
翟玉江
李鹏
付斌
刘吉华
HE Chenggang;ZOU Gang;YE Rongwei;ZHAI Yujiang;LI Peng;FU Bin;LIU Jihua(School of Railway Tracks and Transportation,Wuyi University,Jiangmen 529020,China;Comprehensive Training Center of Modern Industrial Production Technology,Wuyi University,Jiangmen 529020,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第5期26-34,40,共10页
Materials For Mechanical Engineering
基金
广东省基础与应用基础研究基金资助项目(2019A1515110807)
广东省教育厅青年创新人才项目(2018KQNCX271)
五邑大学高层次人才科研启动计划项目(AG2018001)。
关键词
动车车轮
拖车车轮
轮毂
微动损伤
犁沟
剥落
疲劳裂纹
motor car wheel
trailer wheel
wheel hub
fretting damage
furrow
spalling
fatigue crack
