The Tribological Properties of 30CrMnSiA Bearing Steels Treated by the Strengthening Grinding Process under Lubrication Wear
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Strengthening Grinding Process and Surface Treatment of Samples
2.3. Friction and Wear Testing
2.4. Characterization
3. Results
3.1. Surface Morphology
3.2. Friction Coefficients
3.3. Wear Volume and Specific Wear Rate
3.4. Wear Morphology
4. Discussion
5. Conclusions
- (1)
- The strengthening grinding process (SGP) is an effective method to enhance the wear resistance of 30CrMnSiA. Due to numerous micropits on the processed surface treated by SGP, the micropits are comparable to microscopic oil pockets that store lubricants during lubrication and friction, which enhance the surface lubrication properties. The SGP also causes grain refinement in the surface layer, raising the surface hardness of the samples.
- (2)
- At the conditions of the text experiment, the oil storage capacity of the microscopic oil pockets, the surface hardness, and the surface roughness of the sample are all positively correlated with the jet angle of SGP as the jet angle increases from 0° to 90°, and the running-in time of the tested sample increases, mainly due to the increased roughness of the processed surface. Following steady wear, the friction coefficient, the wear volume, and the specific wear rate of the tested samples demonstrate a rapid decrease, then a slight decrease, and then a slow increase. In addition, the average friction coefficient, wear volume, and wear rate of the samples tested are minimized when the jet angle of the SGP is 60°.
- (3)
- In the lubrication and friction test, the wear mechanism of the control sample (0°) is mainly characterized by severe abrasive wear and slight fatigue wear. When the jet angle of the SGP is 30°, the wear mechanism of the tested sample is mainly slight abrasive wear and severe fatigue wear. As the jet angle of the SGP is increased to 60°, the wear mechanism of the tested sample shifts to abrasive wear. At a jet angle of 90°, the wear mechanism shifts back to wear by abrasive and fatigue wear.
- (4)
- In this study, when the jet angle ranges from 0° to 60°, a large number of microscopic oil pockets and the increased hardness were the main reasons for the enhanced wear resistance of the processed surfaces. When the jet angle is 90°, the excessive roughness causes the oil film on the surface to be severely damaged, further leading to a reduction in the lubrication properties of the processed surface and ultimately to the reduced wear resistance of the sample.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Material | Cr | C | Mn | Si | S | P | Fe |
---|---|---|---|---|---|---|---|
30CrMnSiA | 0.98 | 0.34 | 0.97 | 1.03 | ≤0.01 | ≤0.01 | Bal. |
Parameters | Control | Test 1 | Test 2 | Test 3 |
---|---|---|---|---|
Jet angle (°) | 0 | 30 | 60 | 90 |
Jet pressure (MPa) | 0.7 | |||
Jet distance (mm) | 90 | |||
Process time (min) | 15 |
Jet Angle | Control (0°) | 30° | 60° | 90° |
---|---|---|---|---|
Average oil storage volume (µm3) | 0 | 12.46 | 25.35 | 26.12 |
Control (0°) | Test 1 (30°) | Test 2 (60°) | Test 3 (90°) | |
---|---|---|---|---|
Capacity of oil pockets (μm3) | None | 12.46 | 25.35 | 26.12 |
Surface hardness (HV0.2) | 322.4 | 361.2 | 374.8 | 397.7 |
Surface roughness (μm) | 0.48 | 0.97 | 1.21 | 1.37 |
Running-in time (s) | 130 | 286 | 343 | 378 |
Average friction coefficients | 0.2235 | 0.1848 | 0.1609 | 0.1756 |
Wear volume (×10−3 mm3) | 9.04 | 5.79 | 3.82 | 5.53 |
Specific wear rate (×10−3 mm2/N) | 15.13 | 9.66 | 6.36 | 9.22 |
Slight abrasive wear | ✓ | ✓ | ✓ | |
Sever abrasive wear | ✓ | |||
Slight fatigue wear | ✓ | ✓ | ||
Sever fatigue wear | ✓ |
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Liu, X.; Chen, X.; Liang, Z.; Zou, T.; Liu, Z.; Xiao, J.; Li, D.; Yu, D. The Tribological Properties of 30CrMnSiA Bearing Steels Treated by the Strengthening Grinding Process under Lubrication Wear. Materials 2022, 15, 7380. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15207380
Liu X, Chen X, Liang Z, Zou T, Liu Z, Xiao J, Li D, Yu D. The Tribological Properties of 30CrMnSiA Bearing Steels Treated by the Strengthening Grinding Process under Lubrication Wear. Materials. 2022; 15(20):7380. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15207380
Chicago/Turabian StyleLiu, Xiaochu, Xiujie Chen, Zhongwei Liang, Tao Zou, Zhaoyang Liu, Jinrui Xiao, Dongwei Li, and Diaodiao Yu. 2022. "The Tribological Properties of 30CrMnSiA Bearing Steels Treated by the Strengthening Grinding Process under Lubrication Wear" Materials 15, no. 20: 7380. https://0-doi-org.brum.beds.ac.uk/10.3390/ma15207380