【作者】 王文健； 郭俊； 刘启跃；

【Author】 WANG Wen-jian;GUO Jun;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】 通过对大秦重载铁路重车线进行现场调查,发现钢轨损伤主要表现为钢轨侧磨和轨面剥离损伤,通过调查统计发现,钢轨月平均磨耗量1.98 mm,月最大磨耗量4.16 mm。钢轨侧磨损伤严重影响了轮轨接触关系,对轮轨接触行为产生了很大变化。通过提出了利用激光淬火处理钢轨试样来提高耐磨性。研究表明:激光淬火处理后轮轨试样存在一定厚度的淬火处理层,其组织主要为均匀致密的马氏体层;激光淬火基本不改变轮轨试样的滚动摩擦系数;激光淬火可明显提高轮轨试样的表面硬度和耐磨性,相比淬火前轮轨试样磨损量可别分降低62.9%和66.0%;未处理轮轨试样表面损伤主要表现为明显的剥落损伤,激光淬火后轮轨表面损伤相对轻微,重载工况下激光淬火处理使轮轨试样具有较好的抗表面损伤能力。更多还原

【Abstract】 The field investigation of daqin heavy-haul railway indicates that the side wear and serious spalling of rail is dominate on the process of heavy-haul rail damage. The average wear volume of rail each month is about 1.98 mm. The maximum wear volume of rail each month is about 4.16 mm. Serious side wear of rail has an important effect on relation of wheel/rail contact. A laser quenching method for improving wear resistance of rail steel is used and investigated. The results indicate that the wheel/rail specimens form a quenched layer, which is compact martensite layer. The laser quenching has no obvious effect on rolling friction coefficient of wheel/rail specimens. Laser quenching can increase the surface hardness and wear resistance of wheel/rail steels. Therefore, the wear volume of heavy-haul wheel/rail specimens would have an obvious fall and the decrease rate of wheel/rail specimens is about 62.9% and 66.0%, respectively. Obvious spalling damage of wheel/rail specimens is serious when the specimens are not treated. The surface damage of laser quenched wheel/rail specimens is relatively slight. Laser quenched wheel/rail specimens have good surface damage resistance under the heavy-haul condition.更多还原