Research on the Effect of Pearlite Lamellar Spacing on Rolling Contact Wear Behavior of U75V Rail Steel
Abstract
:1. Introduction
2. Materials and Methods
3. Experimental Results
3.1. Effect of Pearlite Lamellar Spacing on Wear Performance of Steel
3.2. Effect of Pearlite Lamellar Spacing on the Rolling Contact Wear Behavior of Steel
3.3. Effect of Pearlite Lamellar Spacing on Machining Hardening under the Rolling Contact Surface Layer
4. Analysis and Discussion
5. Conclusions
- (1)
- The wear resistance of the samples is influenced by the pearlite lamellar spacing. The mass loss and friction coefficient of the samples decrease with the decrease of the lamellar spacing.
- (2)
- The depth of plastic deformation layer is decreased on the worn surface of the sample with the decreasing of the lamellar spacing, and the fatigue crack length and hardening rate increase.
- (3)
- The cementite lamellar of large lamellar spacing is easily fractured and spalled, while the one of medium lamellar spacing is partially broken. It is noted that the thin cementite lamellar of small spacing is bent and hardly broken. The work hardening rate is 35% for the sample with the small lamellar spacing as the plastic deformation of ferrite was hindered by the thin cementite. The plastic deformation layer is difficult to remove, and fatigue cracks are easy to initiate and extend to the interior of the material.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Steels | C | Si | Mn | P | S | V |
---|---|---|---|---|---|---|
U75V rail steel | 0.76 | 0.67 | 0.91 | 0.012 | 0.008 | 0.06 |
Wheel steel | 0.70 | 0.36 | 0.81 | 0.010 | 0.011 | 0.01 |
measurement uncertainty | ±0.02 | ±0.02 | ±0.05 | +0.005 | +0.005 | ±0.01 |
Samples | Isothermal Temperature/°C | Lamellar Spacing/nm | Tensile Strength/MPa | Elongation/% | Brinell Hardness/HB |
---|---|---|---|---|---|
Large lamellar | 650 | 263 | 1072 | 12.6 | 305 |
Medium lamellar | 600 | 161 | 1213 | 12.1 | 358 |
Small lamellar | 500 | 104 | 1306 | 11.4 | 383 |
Samples | 2 h | 4 h | 6 h | 8 h | 10 h | 14 h | 18 h | 23 h | 28 h |
---|---|---|---|---|---|---|---|---|---|
Large lamellar | 0.118 | 0.187 | 0.323 | 0.41 | 0.459 | 0.596 | 0.739 | 0.878 | 1.043 |
Medium lamellar | 0.069 | 0.113 | 0.145 | 0.197 | 0.258 | 0.366 | 0.461 | 0.509 | 0.551 |
Small lamellar | 0.031 | 0.09 | 0.131 | 0.154 | 0.188 | 0.196 | 0.225 | 0.237 | 0.254 |
Samples | 2 h | 4 h | 6 h | 8 h | 10 h | 14 h | 18 h | 23 h | 28 h |
---|---|---|---|---|---|---|---|---|---|
Large lamellar | 0.573 | 0.602 | 0.623 | 0.622 | 0.626 | 0.631 | 0.628 | 0.632 | 0.635 |
Medium lamellar | 0.568 | 0.613 | 0.619 | 0.615 | 0.611 | 0.613 | 0.61 | 0.602 | 0.604 |
Small lamellar | 0.575 | 0.605 | 0.597 | 0.613 | 0.615 | 0.59 | 0.592 | 0.587 | 0.588 |
Samples | Hardness of Plastic Deformation Layer/HV | Hardness of Matrix/HV | Hardening Rate γ/% |
---|---|---|---|
Large lamellar | 392 | 313 | 25.24 |
Medium lamellar | 496 | 378 | 31.22 |
Small lamellar | 536 | 396 | 35.35 |
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Fei, J.; Zhou, G.; Zhou, J.; Zhou, X.; Li, Z.; Zuo, D.; Wu, R. Research on the Effect of Pearlite Lamellar Spacing on Rolling Contact Wear Behavior of U75V Rail Steel. Metals 2023, 13, 237. https://doi.org/10.3390/met13020237
Fei J, Zhou G, Zhou J, Zhou X, Li Z, Zuo D, Wu R. Research on the Effect of Pearlite Lamellar Spacing on Rolling Contact Wear Behavior of U75V Rail Steel. Metals. 2023; 13(2):237. https://doi.org/10.3390/met13020237
Chicago/Turabian StyleFei, Junjie, Guifeng Zhou, Jianhua Zhou, Xudong Zhou, Zhao Li, Duo Zuo, and Run Wu. 2023. "Research on the Effect of Pearlite Lamellar Spacing on Rolling Contact Wear Behavior of U75V Rail Steel" Metals 13, no. 2: 237. https://doi.org/10.3390/met13020237