U68CuCr与U75V轨道钢磨损行为研究

发布时间：2018-08-21 20:24

【摘要】：目的研究耐蚀轨道钢U68CuCr的磨损性能及损伤机理。方法利用M200型摩擦磨损实验机进行轨道钢U68CuCr和U75V与车轮钢滚动对磨实验。运用电子分析天平测量轮轨失重,来研究轮轨磨损随时间的变化规律。通过扫描电子显微镜、超景深显微镜观察轮轨表面损伤形貌。结果磨损初始的15h,U68CuCr磨损量大于U75V。磨损40h时,U68CuCr与U75V的磨损量基本相同,但随时间增加,U68CuCr的磨损量将低于U75V钢。在干态实验下磨损,钢轨表面存在未剥落的片状氧化物以及其剥落后留下的凹坑和划痕,并伴有塑性变形,而车轮表面没有残留的片状氧化物。磨损过程中,钢轨亚表层为塑性变形区,珠光体发生变形,产生加工硬化,使塑性变形层的硬度高于基体。结论 U68CuCr既具有良好的耐磨性,又有高的耐腐蚀性,能改善钢轨使用性能。氧化磨损是钢轨表面损伤的主要方式,磨损是氧化与剥落交错重复出现的过程。
[Abstract]:Aim To study the wear properties and damage mechanism of corrosion-resistant rail steel U68CuCr.Methods The rolling wear experiments of rail steel U68CuCr and U75V with wheel steel were carried out by using M200 friction and wear tester.The wear law of wheel and rail with time was studied by measuring the weight loss of wheel and rail with electronic analysis balance. The wear amount of U68CuCr and U75V is basically the same as that of U68CuCr when the initial wear time is 15 hours and the wear amount of U68CuCr is higher than that of U75V. However, the wear amount of U68CuCr will be lower than that of U75V steel when the wear time increases. During the wear process, the subsurface layer of the rail is a plastic deformation zone, and the pearlite is deformed, resulting in work hardening. The hardness of the plastic deformation layer is higher than that of the matrix. Oxidative wear is the main mode of rail surface damage, and wear is a process of repeated oxidation and spalling.
【作者单位】：武汉科技大学材料与冶金学院;武汉钢铁(集团)公司研究院;
【基金】：国家高技术研究发展计划(863计划)项目(2012AA03A504) U71百米重轨低成本制造及鱼鳞伤损技术攻关及产业化项目(2013011403010505)~~
【分类号】：TG142.1

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