【作者】 丁昊昊； 付志凯； 顾凯凯； 王文健； 刘启跃；

【Author】 DING Hao-hao;FU Zhi-kai;GU Kai-kai;WANG Wen-jian;LIU Qi-yue;Tribology Research Institute,Southwest Jiaotong University;

【机构】 西南交通大学摩擦学研究所；

【摘要】 利用WR-1轮轨滚动磨损试验机研究了不同转速下轮轨材料滚动磨损与损伤性能。结果表明:随着转速增加,轮轨硬度比减小,车轮的磨损率增加,钢轨的磨损率减小。随试验时间增加,车轮磨损率呈现先增加后减小趋势,钢轨磨损率呈现增加趋势。车轮形貌主要由垂直于滚动方向的疲劳裂纹组成,随着速度增加,裂纹变小,表面磨痕更加粗糙。钢轨表面形貌主要由裂纹和块状剥落组成,随速度增加,裂纹更加明显,块状剥落损伤更加严重。车轮材料和钢轨材料的脱落机制不同,车轮表面裂纹疲劳断裂和钢轨表面块状剥落形成磨屑;磨屑外形为尺寸大小不一的薄片组成,成分主要为马氏体和Fe2O3,随转速增大,马氏体含量变大,氧化铁含量变小,磨屑尺寸大小趋于相同。更多还原

【Abstract】 The rolling wear and damage characteristics of wheel and rail materials under different speeds were investigated using a WR-1 wheel/rail rolling wear testing apparatus.The results show that with the increase of speed,the wheel/rail hardness ratio decreases and the wear rate of wheel increases while the wear rate of rail decreases.The wear rate of wheel increases firstly and then decreases while the wear rate of rail increases with test time increasing.The surface damage morphology of wheel specimen consists of fatigue cracks which are perpendicular to rolling direction.The fatigue cracks become smaller and the surface becomes rougher with the increase of speed.The rail surface damage morphology is dominated by cracks and spalling which become severer with speed increasing.Fatigue cracks fracture of wheel specimen and spalling of rail generate debris,which is composed of slices with different sizes and contains Fe2O3 and martensite.With the increase of speed,the content of martensite increases while the content of Fe2O3 decreases and the sizes of slices tend to be similar.更多还原