Analysis on Corner Fine Cracks and Scaling Defects of U75V Rail
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摘要: 针对U75V钢轨在曲线段使用一段时间后发生鱼鳞伤损及剥离掉块缺陷的情况,对其进行化学成分、力学性能、金相和扫描电镜检测分析。结果表明,伤损与钢轨的性能质量无关,鱼鳞伤及剥离掉块是轮轨受较大接触应力下产生的滚动接触疲劳损伤。通过优化轮轨型面、设置欠超高、及时打磨和涂油、合理选轨等措施可以减少滚动接触疲劳损伤的产生。Abstract: Corner fine cracks and scaling defects could be found on the U75V rail after being used in the curve segment for a period of time.The reason for defects was analyzed by means of chemical analysis,mechanical testing,metallurgical testing and scanning electron microscope.The results showed that the damage was nothing to do with the quality of rail,corner fine cracks and scaling defects were caused by rolling contact fatigue under high contact stress.Such damage could be prevented by optimizing wheel/rail profile,setting up appropriate deficient super elevation,grinding and oiled in time,and selecting reasonable rails.
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Key words:
- rail /
- scaling /
- rolling contact fatigue /
- metal rheology
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