Impact Wear Properties of Hypereutectic Rail Joints Welded by Two Welding Processes

被引：0
|
作者：
Li W. [1 ]
Song W. [1 ]
Dai A. [1 ]
Chang K. [1 ]
Bai W. [1 ]
机构：
[1] Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu
来源：
Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2021年 / 56卷 / 02期
关键词：
Aluminothermic welding; Flash welding; Hypereutectoid rail; Impact wear; Spalling fatigue;
D O I：
10.3969/j.issn.0258-2724.20190239
中图分类号：
学科分类号：
摘要：
In order to study the impact damage evolution behavior and the impact performance difference of the hypereutectic rail welding joints welded by flash welding and aluminothermic welding, the impact simulation experiments of the hypereutectoid rail welding seam, the softening part of heat-affected zone and the base metal under different impact cycles were carried out by using a self-made impact wear tester. The results show that the impact wear of the rail welded joints underwent the processes of plastic deformation, pitting failure and fatigue spalling with the increasing impact cycles, and the impact damage is the result of combined action of fatigue wear and oxidation wear. Due to the differences in joint microstructure and mechanical properties caused by different welding processes, the softening part of the heat-affected zone exhibited the most severe plastic deformation, the largest wear volume and wear rate, and the worst impact resistance. The microstructure and impact resistance of the flash welding joint are better than those of the aluminothermic welding joint because of the normal heat treatment after welding. Hardness has a significant effect on the impact resistance of welded joints. The higher the hardness, the better the impact resistance and the later the fatigue spalling. Copyright ©2021 JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY. All rights reserved.
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页码：403 / 410
页数：7
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