摘要
合理的轮轨材料硬度匹配能够显著提高列车的运行安全,为探究不同轮轨材料的硬度匹配行为及机制,利用MMS-2A摩擦磨损试验机对不同轮轨材料进行相应的匹配试验。结果表明:低轴质量下随着轮轨材料硬度比的升高,轮轨间主要磨损机制由磨粒磨损向疲劳磨损和氧化磨损过渡,轮轨材料整体的耐磨性显著提高;高轴质量下轮轨接触应力显著增大,轮轨硬度比的增大能够显著地减轻轮轨材料间的磨粒磨损,轮轨材料整体的耐磨性显著提高。因此,在现有轮轨接触条件下适当增大车轮硬度,使车轮硬度接近钢轨硬度能够显著改善轮轨材料磨损状态,而且对于重载工况效果更为明显。
The reasonable hardness matching of wheel/rail material can significantly improve the operation safety of the train.In order to explore the hardness matching behavior and mechanism of different wheel/rail materials,a MMS-2A friction and wear tester was used to perform corresponding matching tests on different wheel and rail materials.The results indicate that under the lower axle load,with the increasing of hardness ratio of the wheel-rail materials,the wear mechanism of the wheel-rail transforms from abrasive wear to fatigue wear and oxidation wear,and the wear resistance of wheel/rail materials is greatly improved.At a higher axle load,the contact stress is much larger,the increase of the wheel-rail hardness ratio can significantly reduce the abrasive wear between the wheel/rail materials,and the overall wear resistance of the wheel/rail material is significantly improved.It could be concluded that it is reasonable to increase the wheel hardness from the perspective of reducing wear,especially for the heavy-haul condition.The reasonable hardness ratio of different wheel/rail materials is 1∶1.Finally,the future studies in hardness matching of wheel/rail materials are proposed.
作者
刘吉华
赵铮
林群煦
李永健
何成刚
刘启跃
LIU Jihua;ZHAO Zheng;LIN Qunxu;LI Yongjian;HE Chenggang;LIU Qiyue(School of Rail Transportation,Wuyi University,Jiangmen Guangdong 529020,China;Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2019年第11期135-143,共9页
Lubrication Engineering
基金
国家自然科学基金项目(51475393)
广东省青年创新人才类项目(2018KQNCX262)
惠州市科技计划项目(2016X0403018)
江门市基础与理论科学研究类科技计划项目(201701003006113)
关键词
轮轨材料
硬度匹配
磨损机制
研究展望
wheel/rail materials
hardness matching
wear mechanism
research prospects
