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Volume 56 Issue 2
Apr.  2021
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Article Contents
Journal of Southwest Jiaotong University  > 2021  >  56(2): 403-410.
LI Wei, SONG Weijun, DAI An, CHANG Kairong, BAI Wei. Impact Wear Properties of Hypereutectic Rail Joints Welded by Two Welding Processes[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 403-410. doi: 10.3969/j.issn.0258-2724.20190239
Citation: LI Wei, SONG Weijun, DAI An, CHANG Kairong, BAI Wei. Impact Wear Properties of Hypereutectic Rail Joints Welded by Two Welding Processes[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 403-410. doi: 10.3969/j.issn.0258-2724.20190239
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Impact Wear Properties of Hypereutectic Rail Joints Welded by Two Welding Processes

doi: 10.3969/j.issn.0258-2724.20190239
  • Received Date: 02 Apr 2019
  • Rev Recd Date: 22 May 2019
    • Available Online: 16 Oct 2020
  • Publish Date: 15 Apr 2021
    Abstract
  • 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.

     

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