Effects of Laser Melting Distribution on Wear Resistance and Fatigue Resistance of Gray Cast Iron
Abstract
:1. Introduction
2. Experimental
2.1. Experiment Materials
2.2. Experimental Method
2.3. Sample Preparation
2.4. Thermal Fatigue Test
2.5. Wear Tests
2.6. Microstructure Observation and Wear Morphology Observation
3. Results and Discussion
3.1. Structural Analysis of Non-Uniform Models of Bionic Unit of Grey Cast Iron
3.2. Thermal Fatigue Resistance Analysis of Non-Uniform Model of Biomimetic Unit
3.3. Thermal Fatigue Resistance Analysis of Non-Uniform Models of Biomimetic Units
4. Conclusions
- In the process of continuous laser remelting strengthening on the surface of gray cast iron, the adjacent melting zones will affect each other, resulting in heat preservation and a tempering effect, so that the area of the melting zone increases, but the grain size also increases accordingly. The hardness decreased from 765–820 HV (Hardness of Vickers) to 570–620 HV.
- The mechanism of crack initiation in the early stage of thermal fatigue of gray iron was analyzed by EDS, and the phase transformation law of the microstructure in the melting zone was determined at the later stage of thermal fatigue.
- The maximum residual tensile stress was 204 mpa in the melting zone and 103.4 mpa in the phase transformation zone
- The thermal fatigue test showed that the greater the number of distribution strips in the melting zone, the longer the crack initiation time near the remelting zone, and the slower the propagation speed.
- According to the wear test results of different blocks, it can be determined that the P3 model was the best, and the wear resistance of P1 was increased by 21.3%. The wear resistance test results were P3 > P2 > P4 > P1.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Element | C | Si | Mn | P | S | Cu | Cr | Fe |
---|---|---|---|---|---|---|---|---|
Content | 3.41 | 1.61 | 0.96 | 0.02 | 0.01 | 0.315 | 0.180 | Bal. |
Sample | Electric Current (A) | Pulse Duration (ms) | Frequency (Hz) | Defocus Amount (mm) | Laser Energy Density (J/mm2) |
---|---|---|---|---|---|
No.1 | 120 | 7 | 15 | 155 | 144.7 |
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Yang, H.; Zhou, T.; Wang, Q.; Zhou, H. Effects of Laser Melting Distribution on Wear Resistance and Fatigue Resistance of Gray Cast Iron. Metals 2020, 10, 1257. https://doi.org/10.3390/met10091257
Yang H, Zhou T, Wang Q, Zhou H. Effects of Laser Melting Distribution on Wear Resistance and Fatigue Resistance of Gray Cast Iron. Metals. 2020; 10(9):1257. https://doi.org/10.3390/met10091257
Chicago/Turabian StyleYang, Haiyang, Ti Zhou, Qingnian Wang, and Hong Zhou. 2020. "Effects of Laser Melting Distribution on Wear Resistance and Fatigue Resistance of Gray Cast Iron" Metals 10, no. 9: 1257. https://doi.org/10.3390/met10091257