Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Materials
2.2. Experiment
3. Results and Discussion
3.1. Surface Morphology of the Cleaned Material
3.1.1. The Effect of Laser X-Scanning Speed
3.1.2. The Effect of Laser Y-Moving Speed
3.2. Distribution of Element on the Surface of the Cleaned Material
3.2.1. The Effect of Laser X-Scanning Speed
3.2.2. The Effect of Laser Y-Moving Speed
3.3. Roughness and Three-Dimensional Topography of the Surface of the Cleaned Material
3.3.1. The Effect of Laser X-Scanning Speed
3.3.2. The Effect of Laser Y-Moving Speed
3.4. Microstructure of the Cleaned Region
3.5. Hardness of the Fine Grain Layer after Cleaning
4. Conclusions
- (1)
- When the Y-moving speed was of 7 mm/s, the cleaned surface was damaged due to laser radiation of the relatively high energy at the X-scanning speeds of 500 mm/s and 1000 mm/s. Then, the content of Fe element on the cleaned surface increased to 89% and then decreased to about 80%. With increasing X-scanning speed from 500 mm/s up to 2000 mm/s, the roughness declined up to 0.5 μm and then had a little promotion.
- (2)
- When the X-scanning speed was equal to 1500 mm/s, the amount of the residual paint on the cleaned surface tended to increase with increasing Y-moving speed from 5 mm/s to 11 mm/s. This is because the action time of the laser radiation on the surface became short. Meanwhile, the content of Fe element on the cleaned surface had a tendency of firstly decreasing and then remaining constant. Moreover, the roughness reached 0.5 μm at a Y-moving speed of 7 mm/s.
- (3)
- Comprehensively, the cleaning effect of the surface paint could be better on the condition of a X-scanning speed of 1500 mm/s and a Y-moving speed of 7 mm/s during laser cleaning, since there was no damage, negligible residual paint, and the minimum roughness on the cleaned surface.
- (4)
- A fine grain layer appeared on the cleaned surface after laser cleaning at the X-scanning speeds of 500 mm/s and 1000 mm/s, and a Y-moving speed of 7 mm/s. The maximum hardness of the fine grain layer was two times higher than the base metal, more than 400 HV. Moreover, the hardness of the peak of the fine grain layer was larger than those at the valley.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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C | Si | Mn | P | S | Cr | Mo | Ni | Al | Fe |
---|---|---|---|---|---|---|---|---|---|
0.21 | 0.12 | 0.96 | <0.0005 | 0.0026 | 0.03 | 0.01 | 0.02 | 0.04 | Bal. |
Laser Main Parameters/Unit | Value |
---|---|
X-scanning speed/(mm/s) Y-moving speed/(mm/s) | 500, 1000, 1500, 2000 5, 7, 9, 11 |
Average rated power/W | 100 |
Single pulse energy/(mJ) | 2 |
Repetition rate/(kHz) | 100 |
Pulse width/(ns) | 400 |
Spot size/(mm) | 0.6 |
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Li, X.; Wang, D.; Gao, J.; Zhang, W.; Li, C.; Wang, N.; Lei, Y. Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal. Materials 2020, 13, 5363. https://doi.org/10.3390/ma13235363
Li X, Wang D, Gao J, Zhang W, Li C, Wang N, Lei Y. Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal. Materials. 2020; 13(23):5363. https://doi.org/10.3390/ma13235363
Chicago/Turabian StyleLi, Xinyan, Dan Wang, Juming Gao, Weiwei Zhang, Canyang Li, Nianzheng Wang, and Yucheng Lei. 2020. "Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal" Materials 13, no. 23: 5363. https://doi.org/10.3390/ma13235363