Affiliation:
1. State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China
2. School of Mechatronics and Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
3. Railway Industry Key Laboratory of Intelligent Operation and Maintenance of Rolling Stock, East China Jiaotong University, Nanchang 330013, China
Abstract
The impact of the complex braking environment on the service performance of the repair fusion cladding was studied, which is of great significance to improve the ability of the train wheel track system to resist the extremely harsh environment. In this paper, a 316L stainless steel coating was prepared using laser fusion cladding repair technology for the local damage location of the train wheel tread. The MS-HT1000 high-temperature wear tester was used for the experiment. Then, the influence of different braking conditions on the friction and wear performance of the repaired specimens at room temperature and high temperature was analyzed. The results showed that the microstructure of the laser-repaired 316L stainless steel coating was dendritic and eutectic, and its physical phase was mainly composed of austenite, Fe-Cr, and carbides. The wear rate increases with the rise in the shaft weight load, indicating that the higher the contact load, the more severe the wear. In contrast, the influence of the friction coefficient in a room temperature environment is less variable. With an increase in the braking frequency, the wear of the specimen firstly rises and then decreases, and when the frequency is 1 Hz, the value of the wear rate at room temperature is the largest, and the wear surface appears as more peeling layers, and a large amount of wear debris is randomly distributed, which manifests as the wear mechanism being characterized by abrasive wear and adhesive wear. Therefore, different factors affect the wear level of the material differently, with the axle weight load having the greatest influence. The relevant results help to provide corresponding theoretical references for the optimization of parameters under the braking condition of the wheel tread, which ensures the normal operation of the braking system when driving.
Funder
National Natural Science Foundation of China
Jiangxi Provincial Natural Science Foundation
Open Project of Key Laboratory of Conveyance Equipment (East China Jiaotong University), Ministry of Education
Jiangxi Provincial Department of Education Project
Jiangxi Provincial Postgraduate Innovation Special Project
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces