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Influence of Contact Stress on Surface Microstructure and Wear Property of D2/U71Mn Wheel-Rail Material

机译：接触应力对D2 / U71Mn轮轨材料表面组织和磨损性能的影响

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摘要

To investigate the relationship between surface microstructure and wear mechanism in D2/U71Mn wheel-rail material under different contact stress conditions, rolling wear tests using a GPM-40 wear machine to simulate the wheel-rail operation was performed. After wear tests, an optical microscope (OM), scanning electron microscope (SEM) and micro-hardness testers were used to characterize the microstructure and fatigue wear cracks. The results show that the thickness of the plastic deformation layer and surface hardness is increased with the increase of contact stress. Under high contact stress condition (1200 MPa), the severe plastic deformation layer led to the formation of fatigue wear of wheel-rail samples. Under a contact stress of 700 MPa, the wear mechanism of samples is adhesive wear and wear rate is low. With the increase of contact stress, the fatigue cracks are gradually severe. Under a contact stress of 1200 MPa, the wear mechanism of samples becomes fatigue wear and the fatigue wear cracks cause the increase of wear rate. The fatigue wear can accelerate the wear failure of wheel-rail samples. The fatigue wear cracks of wheel samples are severer than that of rail samples due to both the rate of plastic strain and the content of proeutectoid ferrite.
机译：为了研究D2 / U71Mn轮轨材料在不同接触应力条件下的表面微观结构与磨损机理之间的关系，使用GPM-40磨损机模拟轮轨运行进行了滚动磨损测试。经过磨损测试后，使用光学显微镜（OM），扫描电子显微镜（SEM）和显微硬度测试仪来表征显微组织和疲劳磨损裂纹。结果表明，塑性变形层的厚度和表面硬度随接触应力的增加而增加。在高接触应力条件下（1200 MPa），严重的塑性变形层导致轮轨样品疲劳磨损的形成。在700 MPa的接触应力下，样品的磨损机理为胶粘剂磨损，磨损率较低。随着接触应力的增加，疲劳裂纹逐渐严重。在1200 MPa的接触应力下，样品的磨损机理为疲劳磨损，疲劳磨损裂纹导致磨损率增加。疲劳磨损会加速轮轨样品的磨损。由于塑性应变的速率和共析铁素体的含量，车轮试样的疲劳磨损裂纹比钢轨试样的疲劳裂纹严重。

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