Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios
This study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revea...
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doaj-ea2217b82fbf44c18af313d3e0919dbb2020-11-25T03:44:29ZengMDPI AGMaterials1996-19442020-10-01134678467810.3390/ma13204678Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip RatiosJiapeng Liu0Yingqi Li1Yinhua Zhang2Yue Hu3Lubing Shi4Haohao Ding5Wenjian Wang6Fengshou Liu7Shaobo Zhou8Tong Shi9Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaMetals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaMetals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaTribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaTribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaTribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaTribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, ChinaMetals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaMetals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaMetals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, ChinaThis study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revealed that the rolling contact fatigue wear mechanism played a significant role under the low slip ratio, but the dominant wear mechanism transferred to the abrasive wear at the high slip ratio. Meanwhile, the bainitic steel specifically presented worse wear resistance under the abrasive wear mode. Compared with the influence of a slip ratio, the increase in contact stress led to severer plastic flows and contributed to the propagation of cracks. In addition, the contact stress and slip ratio had the opposite effect on the friction coefficient, that is, the friction coefficient of bainitic steels behaved the inverse proportion with the contact stress, but positive proportion with the slip ratio. At last, the increase in slip ratio had more significant effect on the reduction of retained austenite (RA) than the enlargement of contact stress due to the fact that the RA would probably be removed before the martensitic transformation occurred under the abrasive wear mechanism.https://www.mdpi.com/1996-1944/13/20/4678bainitic rail steelcontact stressslip ratiowear mechanismfriction coefficient; retained austenite |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jiapeng Liu Yingqi Li Yinhua Zhang Yue Hu Lubing Shi Haohao Ding Wenjian Wang Fengshou Liu Shaobo Zhou Tong Shi |
spellingShingle |
Jiapeng Liu Yingqi Li Yinhua Zhang Yue Hu Lubing Shi Haohao Ding Wenjian Wang Fengshou Liu Shaobo Zhou Tong Shi Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios Materials bainitic rail steel contact stress slip ratio wear mechanism friction coefficient; retained austenite |
author_facet |
Jiapeng Liu Yingqi Li Yinhua Zhang Yue Hu Lubing Shi Haohao Ding Wenjian Wang Fengshou Liu Shaobo Zhou Tong Shi |
author_sort |
Jiapeng Liu |
title |
Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios |
title_short |
Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios |
title_full |
Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios |
title_fullStr |
Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios |
title_full_unstemmed |
Dry Rolling/Sliding Wear of Bainitic Rail Steels under Different Contact Stresses and Slip Ratios |
title_sort |
dry rolling/sliding wear of bainitic rail steels under different contact stresses and slip ratios |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-10-01 |
description |
This study aims to deeply understand the effect of contact stress and slip ratio on wear performances of bainitic rail steels. The results showed that the wear loss increased as the contact stress and slip ratio increased. Based on the surface damage morphology and microstructural analyses, it revealed that the rolling contact fatigue wear mechanism played a significant role under the low slip ratio, but the dominant wear mechanism transferred to the abrasive wear at the high slip ratio. Meanwhile, the bainitic steel specifically presented worse wear resistance under the abrasive wear mode. Compared with the influence of a slip ratio, the increase in contact stress led to severer plastic flows and contributed to the propagation of cracks. In addition, the contact stress and slip ratio had the opposite effect on the friction coefficient, that is, the friction coefficient of bainitic steels behaved the inverse proportion with the contact stress, but positive proportion with the slip ratio. At last, the increase in slip ratio had more significant effect on the reduction of retained austenite (RA) than the enlargement of contact stress due to the fact that the RA would probably be removed before the martensitic transformation occurred under the abrasive wear mechanism. |
topic |
bainitic rail steel contact stress slip ratio wear mechanism friction coefficient; retained austenite |
url |
https://www.mdpi.com/1996-1944/13/20/4678 |
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