Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Sample Processing and Preparation
2.2. Experimental Method
3. Results and Analysis
3.1. Hardness before Laser Hardening
3.2. Micro-Hardness Test and Analysis of Laser Hardening Hardened Zone
3.3. Microstructure Analysis
3.3.1. Metallographic Analysis
3.3.2. Scanning Electron Microscopy Analysis
3.3.3. Transmission Electron Microscopy Analysis
3.3.4. X-ray Diffraction Analysis
4. Tribological Behavior
4.1. Friction Coefficient
4.1.1. Friction Coefficient at Different Speeds
4.1.2. Friction Coefficient of Hardened Layer under Various Normal Forces
4.2. Wear Rate Calculation
4.3. Analysis of Wear Rate and Wear Morphology
4.3.1. Wear Rate and Wear Morphology before and after Laser Hardening
4.3.2. Wear Mechanism of Hardened Layer at Different Relative Friction Speeds
4.3.3. Influence of Normal Force on Wear Rate and Wear Morphology
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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C | Si | Mn | Cr | Mo | Ni | Fe |
---|---|---|---|---|---|---|
0.36 | 0.23 | 0.68 | 0.77 | 0.18 | 1.33 | Balance |
Speed (mm/min) | Friction Coefficient (Matrix Material) | Friction Coefficient (Laser Hardening with a Scanning Speed of 700 mm/min) | Friction Coefficient (Laser Hardening with a Scanning Speed of 800 mm/min) | Friction Coefficient (Laser Hardening with a Scanning Speed of 900 mm/min) |
---|---|---|---|---|
300 | 0.563 ± 0.072 | 0.378 ± 0.040 | 0.358 ± 0.026 | 0.402 ± 0.039 |
400 | 0.499 ± 0.045 | 0.330 ± 0.029 | 0.327 ± 0.019 | 0.346 ± 0.036 |
500 | 0.362 ± 0.043 | 0.304 ± 0.020 | 0.303 ± 0.018 | 0.308 ± 0.035 |
Normal Force (N) | Friction Coefficient | Standard Deviation |
---|---|---|
20 | 0.303 | 0.019 |
50 | 0.381 | 0.040 |
80 | 0.437 | 0.045 |
Organization | Force (N) | Time (min) | Movement Speed (mm/min) | Laser Scanning Speed (mm/min) | Wear Rate (10−3 mg/min) | Standard Deviation |
---|---|---|---|---|---|---|
Matrix | 20 | 20 | 300 | / | 2.35 | 0.245 |
Matrix | 20 | 20 | 400 | / | 4.00 | 0.421 |
Matrix | 20 | 20 | 500 | / | 5.85 | 0.592 |
Hardening layer | 20 | 20 | 300 | 700 | 1.40 | 0.138 |
Hardening layer | 20 | 20 | 400 | 700 | 1.80 | 0.181 |
Hardening layer | 20 | 20 | 500 | 700 | 2.00 | 0.202 |
Hardening layer | 20 | 20 | 300 | 800 | 1.35 | 0.142 |
Hardening layer | 20 | 20 | 400 | 800 | 1.60 | 0.182 |
Hardening layer | 20 | 20 | 500 | 800 | 1.95 | 0.205 |
Hardening layer | 50 | 20 | 500 | 800 | 4.50 | 0.476 |
Hardening layer | 80 | 20 | 500 | 800 | 11.00 | 1.213 |
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Li, J.; Yan, H.; Li, S.; Zhang, Y.; Zhu, P. Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening. Coatings 2021, 11, 1282. https://doi.org/10.3390/coatings11111282
Li J, Yan H, Li S, Zhang Y, Zhu P. Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening. Coatings. 2021; 11(11):1282. https://doi.org/10.3390/coatings11111282
Chicago/Turabian StyleLi, Jia, Hongzhi Yan, Songbai Li, Yin Zhang, and Pengfei Zhu. 2021. "Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening" Coatings 11, no. 11: 1282. https://doi.org/10.3390/coatings11111282