| FENG Zong-li,ZHANG Qing-song,DAI Guang-ze,LI Qiu-ze.Influence of Laminar Plasma Spot Quenching Area Ratio on Wear Properties of Wheel/Rail Materials[J],50(9):244-253, 260 |
| Influence of Laminar Plasma Spot Quenching Area Ratio on Wear Properties of Wheel/Rail Materials |
| Received:December 03, 2020 Revised:March 23, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.025 |
| KeyWord:laminar plasma spot quenching rolling wear wheel/rail material surface damage plastic deformation |
| Author | Institution |
| FENG Zong-li |
Southwest Jiaotong University, Chengdu , China |
| ZHANG Qing-song |
Southwest Jiaotong University, Chengdu , China |
| DAI Guang-ze |
Southwest Jiaotong University, Chengdu , China |
| LI Qiu-ze |
CRRC Changchun Railway Vehicles Co., Ltd, Changchun , China |
|
| Hits: |
| Download times: |
| Abstract: |
| This work aims to apply laminar plasma spot quenching process to improve the wear resistance of wheel/rail materials and to explore the best surface treatment area ratio. The surface of high-speed wheel/rail material was treated by laminar plasma spot quenching, four groups of wheel/rail samples with different spot quenching area ratio (0%, 15%, 30% and 45%) were tested by MJP-30 rolling contact wear tester. The wear morphology and wear resistance of wheel/rail samples were characterized by metallographic microscope, scanning electron microscope (SEM) and hardness tester. The results showed that laminar plasma spot quenching can obtain dense lath martensite structure, the surface hardness of wheel and rail materials increased by more than 200% and the wear rate decreased by more than 80%. When the area ratio is 30%, the wear rate of wheel/rail material is the smallest. Compared with the untreated sample, the total wear rate is reduced by 89.2%, the wear rate of wheel is reduced by 89.6%, and the wear rate of rail is reduced by 88.7%. The characteristics of surface damage and section microcracks of the wheel and rail samples after the wear test showed that the surface damage of the spot quenched samples was significantly reduced, and the spalling and crack were mainly concentrated in the quenching transition region. Importantly, the quenching region could obviously inhibit the plastic deformation of the material, the quenched region and the matrix bonding layer can resist further crack propagation. When the area ratio is 30%, the wear resistance of the wheel/rail samples is the best. It is concluded that laminar plasma point quenching can effectively improve the wear resistance of wheel/rail materials, and the quenching area ratio of about 30% is the best surface treatment process. |
| Close |
|
|
|