过盈量和套管长度对EA4T车轴钢微动疲劳行为的影响及其微动疲劳极限的预测  

Effect of interference fit and pipe length on fretting fatigue behavior of EA4T axle steel and prediction of fretting fatigue limit under rotating bending

作　　者：尹鸿祥 吴毅 李翔 张关震 刘丹 沙江波[2] YIN Hong-xiang;WU Yi;LI Xiang;ZHANG Guan-zhen;LIU Dan;SHA Jiang-bo(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《材料热处理学报》2022年第9期155-164,共10页Transactions of Materials and Heat Treatment

基　　金：中国铁道科学研究院集团公司基金(2021YJ223)。

摘　　要：高铁EA4T钢车轴与轮毂配合边缘部位微量的相对滑动往往导致该位置发生微动磨损,严重损害了车轴的疲劳性能和列车安全性。采用轴/套管试样模拟车轴/轮毂结构,研究了过盈量(0.01、0.02和0.03 mm)和套管长度(10 mm和15 mm)对EA4T钢室温微动疲劳性能的影响规律,应用有限元计算了轴/套接触区的压应力分布,提出了基于车轴/套管过盈配合处摩擦力的微动疲劳极限的预测公式。结果表明:随着过盈量增加或套管长度减小,轴与套管接触区边缘处的径向压应力和轴向摩擦力增加,EA4T钢的疲劳极限下降了17.1%~28.6%;接触区边缘产生氧化铁磨屑,促进疲劳裂纹多源萌生。微动疲劳极限的预测公式为σ_(1WF)=σ_(-1)-αμP。A small amount of relative sliding at the matching edge of high-speed railway EA4T steel axle and wheel hub often leads to fretting wear at this position,which seriously damages the fatigue performance of the axle and safety of the high-speed train.Using the axle/pipe sample to simulate the axle and hub structure,the effects of interference fit(0.01,0.02 and 0.03 mm)and pipe length(10 mm and 15 mm)on fretting fatigue behavior of the EA4T steel at room temperature under rotating bending were investigated.The compressive stress distribution between the axle and the pipe contact area was calculated by finite element method,and the prediction formula of fretting fatigue limit based on friction at the axle/pipe interference fit was put forward.The results show that with the increase of interference fit or the decrease of pipe length,the radial compressive stress and axial friction at the edge of the contact area between axle and pipe increase,and the fatigue limit of the EA4T steel decreases by 17.1%-28.6%.Iron oxide debris is produced at the edge of the contact area,which promotes the multi-source initiation of fatigue cracks.The prediction formula of fretting fatigue limit isσ_(1WF)=σ_(-1)-αμP.

关 键 词：车轴钢EA4T 过盈量 套管长度 微动疲劳极限 微动磨损 

分 类 号：TG142.3[一般工业技术—材料科学与工程]