| 摘要: |
| 为提高高速列车车轴钢的疲劳性能，对车轴钢EA4T进行了表面超声滚压处理(SURP)。综合运用了粗糙度测量仪、扫描电子显微镜(SEM)、X射线衍射应力分析仪、显微硬度仪以及金相显微镜研究了表面超声滚压处理工艺参数中静压力和进给速度对高速列车车轴钢表面粗糙度、表面残余应力状态、表层显微硬度及微观组织的影响规律。结果表明： 在试验参数范围内，静压力和进给速度越低，车轴钢的表面粗糙度越低；SURP后，试样表面轴向残余压应力得到大幅度提高，并且随着静压力的增加而增加，随着进给速度的增加而减小；表面硬度以及塑性变形层厚度随两参数的变化规律与残余应力的变化规律相似。 |
| 关键词: 表面超声滚压处理 表面粗糙度 残余应力 显微硬度 微观组织 |
| DOI：10.3969/j.issn.1007-9289.2014.05.012 |
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| Influences of Surface Ultrasonic Rolling Processing Parameters on Surface Condition of Axle Steel Used in High Speed Trains |
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CHEN Liqin, XIANG Bin, REN Xuechong, LIU Xingui, LIN Guobiao1,2
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1a. School of Materials Science and Engineering, 1b. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083;2. Materials ＆ Chemistry Research Institute, China Academy of Railway Science, Beijing 100081
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| Abstract: |
| In order to improve the fatigue performance of the axle steel used in high speed trains, the surface ultrasonic rolling processing (SURP) was used. The influences of different static loads and feeding speeds on the surface roughness, surface residual stress, surface microhardness and microstructure of high speed train axle steel were investigated using a comprehensive application of roughness instrument, scanning electron microscope(SEM), Xray stress analyzer, microhardness tester and metallurgical microscope. The results show that the lower the static loads and feeding speeds are, the smaller the surface roughness of processed specimens is. After SURP, the surface residual stress is significantly improved, and it increases with the increase of the static load, but decreases as the feeding speed increases. The change regulations of the surface hardness and plastic deformation thickness are the same as that of the residual stress. |
| Key words: surface ultrasonic rolling processing surface roughness residual stress microhardness microstructure |
