车轮材料特性对轮轨磨损与疲劳性能影响的研究

发布时间：2018-11-18 22:30

【摘要】：在MMS-2A滚动摩擦磨损试验机上进行不同材料车轮与U75V热轧钢轨的匹配试验,研究材料特性对轮轨试样磨损与疲劳性能的影响.结果表明:随着车轮碳含量增加,组织中珠光体比例增加,珠光体中渗碳体片层间距减小,硬度增大;随着轮/轨硬度比增大,车轮表层的塑性变形层厚度逐渐减小,对摩副钢轨塑性变形层厚度呈现先增大后减小的趋势;车轮试样磨损形式由小剥离掉块向大剥离掉块转变,钢轨磨损机制由材料表层的轻微剥落向深层剥落磨损转变;提升车轮的硬度,轮轨表面的疲劳裂纹长度减小;且随着车轮硬度的增大,钢轨表面萌生的疲劳裂纹的末端扩展角度有增大的趋势,使钢轨的疲劳裂纹更容易向材料心部扩展.
[Abstract]:The matching test of wheel of different materials and U75V hot rolled rail was carried out on MMS-2A rolling friction and wear tester, and the influence of material characteristics on wear and fatigue properties of wheel / rail specimen was studied. The results show that with the increase of carbon content in the wheel, the ratio of pearlite in the microstructure increases, the cementite lamellar spacing decreases and the hardness increases. With the increase of wheel / rail hardness ratio, the thickness of plastic deformation layer decreases gradually, and the thickness of plastic deformation layer increases first and then decreases. The wear form of wheel specimen changed from small peeling off block to large peeling off block, the wear mechanism of rail changed from the slight spalling of material surface to deep exfoliation, and the fatigue crack length of wheel / rail surface decreased when the wheel hardness was raised. With the increase of wheel hardness, the end propagation angle of fatigue crack on rail surface is increasing, which makes the fatigue crack of rail propagate to the material center more easily.
【作者单位】：西南交通大学牵引动力国家重点实验室摩擦学研究所;
【基金】：国家自然科学基金项目(51475393) 国家重点实验室自主研究课题(TPL 1301)资助~~
【分类号】：TG115.58

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