SS3B和DF8B机车的整体碾钢轮踏面剥离失效分析  

Causes Analysis of Tread Spalling Defects on Solid Rolled Wheels of SS3B and DF8B Locomotives

作　　者：王玉辉[1] 何国旗[2,3] 

机构地区：[1]湖南铁路科技职业技术学院机车车辆系,湖南株洲412000 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [3]湖南工业大学机械工程学院,湖南株洲412007

出　　处：《西南交通大学学报》2013年第5期904-908,共5页Journal of Southwest Jiaotong University

基　　金：国家"973"计划重点基础研究发展项目(2011CB706800);国家自然科学基金资助项目(51375159);湖南省高等学校科学研究项目(12A038);湖南省教育厅科学研究项目(13C595)

摘　　要：为了查明机车车轮发生踏面剥离故障的原因,分别对SS3B机型的SS3B31024047车轮和DF8B机型的DF8B32774060、DF8B31644017车轮产生踏面剥离的整体碾钢轮取样,按TJZL-01-98规定的理化检验项目进行取样和常规检验,并对剥离区域的宏观形貌、金相组织进行光学显微镜观察、电子扫描分析.检验结果表明:DF8B32774060车轮踏面表面金属主要在接触应力作用下发生塑性变形,属于接触疲劳剥离;DF8B31644017和SS3B31024047车轮由于剥离区存在塑性变形层,属于热疲劳剥离;对接触疲劳剥离,应改善车轮钢的成分、改进车轮热处理和踏面加工工艺,对热疲劳剥离,应改变制动方式和优化牵引运行.In order to find out the causes of locomotive wheel tread spalling defects,the tread spalling of solid rolled wheels were sampled for routine examinations,including the SS3B31024047 wheels of the SS3B locomotive,the DF8B31644017 wheels and the DF8B32774060 wheels of the DF8B locomotive.The macroscopic feature and microstructure of the tread spalling area were analyzed in terms of the TJZJ-01-98,with light micro-scope observation and electronic scanning.The test results show that the surface metal of DF8B32774060 wheels mainly underwent plastic deformation under contact stress,and the spalling was caused by the rolling contact fatigue.However,SS3B31024047 and DF8B31644017 wheels＇ tread spalling was attributed to the plastic deformation layer in the tread spalling area caused by thermal fatigue.Therefore,reduction of the wheel tread spalling caused by the rolling contact fatigue could be achieved by adjustment of the chemical composition of steel,improvement of the heat treatment and tread processing technologies of wheels ; and the thermal fatigue spalling can be alleviated by changing the braking mode and optimizing the traction operation.

关 键 词：整体碾钢轮 踏面剥离 剥离区域 

分 类 号：U260.331[机械工程—车辆工程]