CL65和CL70材质车轮的抗热裂性能探究  

Research on the Heat Cracking Resistance of CL65 and CL70 Material Wheels

作　　者：李广 陈朝阳 吴斯 张关震 张澎湃 吴毅 LI Guang;CHEN Zhaoyang;WU Si;ZHANG Guanzhen;ZHANG Pengpai;WU Yi(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081

出　　处：《高速铁路新材料》2024年第5期39-43,共5页Advanced Materials of High Speed Railway

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(N2022J026);国家重点研发计划课题(2023YFA1609201)。

摘　　要：为了探究车轮钢碳含量对车轮抗热裂纹性能的影响趋势,以CL65和CL70材质车轮为研究对象开展研究。通过高温拉伸试验确定2种车轮钢在常温至600℃范围内材料力学参数,结合实测参数在ANSYS中建立车轮有限元模型,仿真模拟停车制动过程中车轮踏面温度和轮辋周向压应力-时间历程,并通过基于单轴疲劳的定性评估模型来估算车轮热裂纹萌生寿命。结果表明:停车制动工况下CL65和CL70材质车轮的踏面温度基本一致,但CL65车轮轮辋周向压应力略小,这与车轮钢材料在弹性模量、屈服强度和线膨胀系数等参数的差异有关;仅从抗热裂纹能力角度来看,CL65车轮的热裂纹萌生寿命估算值略大,认为合理控制车轮钢碳含量有利于提高踏面的抗热裂性能。In order to explore the influence trend of carbon content in wheel steel on the thermal crack resistance performance of wheels,CL65 and CL70 material wheels were studied as research objects.Firstly,the material mechanical parameters of two types of wheel steels in the range of room temperature to 600℃was determined through high-temperature tensile tests,and a finite element model of the wheel in ANSYS was established based on the measured parameters.Then,the wheel tread's temperature and the wheel rim's circumferential compressive stress during the parking brake process were simulated,and the thermal crack initiation life of the wheel was estimated by a qualitative evaluation model based on uniaxial fatigue.The research results indicate that under parking brake conditions,the tread temperature of CL65 and CL70 material wheels is basically the same,but the circumferential compressive stress of CL65 wheel rims is slightly smaller,which is related to the differences in parameters such as elastic modulus,yield strength,and linear expansion coefficient of wheel steel materials.From the perspective of thermal crack resistance,the estimated life of thermal crack initiation for CL65 wheels is slightly higher,and it is believed that reasonable control of the carbon content in wheel steel is beneficial for improving the thermal crack resistance of the tread.

关 键 词：车轮钢 有限元仿真 裂纹萌生寿命 抗热裂性能 

分 类 号：U211.5[交通运输工程—道路与铁道工程]