Abstract The rolling wear experiments of D2 wheel steel were carried out on the friction and wear machine. The forming mechanism of polygonisation on the sample surface and the influence of polygonisation wear on microstructure and hardness were studied by using contour measuring instrument, acceleration sensor, SEM (with EBSD) and microhardness tester. The results indicate that the polygonisation of the sample surface is mainly caused by the vertical vibration of the system and wear coupled under the rolling wear conditions. The development process of crest surface wear is from the initial adhesive wear to oxidation wear and adhesive wear, and finally to oxidation wear with a small amount of fatigue wear. The trough surface wear is fatigue wear, which is gradually intensified. After forming the polygonisation, the surface of crest and trough will respectively produces rolling-sliding contact with different creep rate. The wear mode changes from uniform wear to severe wear, and the wear of trough is more significantly serious than that of crest. During the formation of the polygonisation, the proportion of high angle grain boundary (HAGB) in the pre-eutectoid ferrite at the subsurface of crest and trough increased obviously, the grain refinement is more serious, and the hardness extreme or platform appears. The highest hardness is always on the surface. However, the surface hardness of the crest is similar to that of the unformed polygonisation, and the surface hardness of the trough continues to increase with the development of the polygonisation.

中文翻译：

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D2车轮钢在滚动磨损条件下形成多边形的机理及其对组织和性能的影响

摘要 在摩擦磨损机上进行了D2轮钢的滚动磨损试验。采用轮廓测量仪、加速度传感器、扫描电镜（带EBSD）和显微硬度计研究了试样表面多边形化的形成机理以及多边形化磨损对组织和硬度的影响。结果表明，试样表面的多边形化主要是由系统的垂直振动和滚动磨损条件下的磨损耦合引起的。波峰面磨损的发展过程是从最初的粘着磨损到氧化磨损和粘着磨损，最后到氧化磨损并伴有少量疲劳磨损。槽面磨损为疲劳磨损，并逐渐加剧。形成多边形后，波峰和波谷的表面将分别产生不同蠕变速率的滚滑接触。磨损方式由均匀磨损向严重磨损转变，波谷磨损比波峰磨损更严重。在多边形化形成过程中，波峰和波谷亚表层的预共析铁素体中大角度晶界（HAGB）的比例明显增加，晶粒细化更加严重，出现硬度极限或平台。最高硬度总是在表面。但是，波峰的表面硬度与未成形的多边形的表面硬度相似，并且波谷的表面硬度随着多边形的发展而不断增加。磨损方式由均匀磨损向严重磨损转变，波谷磨损比波峰磨损更严重。在多边形化形成过程中，波峰和波谷亚表层的预共析铁素体中大角度晶界（HAGB）的比例明显增加，晶粒细化更加严重，出现硬度极限或平台。最高硬度总是在表面。但是，波峰的表面硬度与未成形的多边形的表面硬度相似，并且波谷的表面硬度随着多边形的发展而不断增加。磨损方式由均匀磨损向严重磨损转变，波谷磨损比波峰磨损更严重。在多边形化形成过程中，波峰和波谷亚表层的预共析铁素体中大角度晶界（HAGB）的比例明显增加，晶粒细化更加严重，出现硬度极限或平台。最高硬度总是在表面。但是，波峰的表面硬度与未成形的多边形的表面硬度相似，并且波谷的表面硬度随着多边形的发展而不断增加。波峰和波谷亚表层的预共析铁素体中大角度晶界(HAGB)的比例明显增加，晶粒细化更严重，出现硬度极限或平台。最高硬度总是在表面。但是，波峰的表面硬度与未成形的多边形的表面硬度相似，并且波谷的表面硬度随着多边形的发展而不断增加。波峰和波谷亚表层的预共析铁素体中大角度晶界(HAGB)的比例明显增加，晶粒细化更严重，出现硬度极限或平台。最高硬度总是在表面。但是，波峰的表面硬度与未成形的多边形的表面硬度相似，并且波谷的表面硬度随着多边形的发展而不断增加。