| ZHOU Hao,ZHAO Zhen-yu,ZHOU Hou-ming,LI Kai,YIN Jie.Study on Dual-beam Laser Polishing of Surface of S136D Die Steel[J],50(11):111-120, 128 |
| Study on Dual-beam Laser Polishing of Surface of S136D Die Steel |
| Received:November 24, 2020 Revised:May 24, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.11.009 |
| KeyWord:die steel dual-laser, S136D laser polishing wear resistance roughness |
| Author | Institution |
| ZHOU Hao |
Shenzhen Institute of Information Technology, Shenzhen , China;School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| ZHAO Zhen-yu |
Shenzhen Institute of Information Technology, Shenzhen , China |
| ZHOU Hou-ming |
School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| LI Kai |
Shenzhen Institute of Information Technology, Shenzhen , China;School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| YIN Jie |
Shenzhen Institute of Information Technology, Shenzhen , China;School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
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| Abstract: |
| To ameliorate the S136D die steel surface, the dual-beam laser polishing was proposed. Two different laser beams were used to polish the surface of S136D die steel. Firstly, the continuous laser with high energy was used to polish the material surface and decrease the roughness. Secondly, the surface was polished again by using the pulsed laser to further decrease the roughness. The result shows that the surface roughness can be reduced from 7.973 μm to 0.872 μm and the friction coefficient can be reduced from 0.650 to 0.609 by continuous laser polishing. By using dual-beam laser polishing, the roughness was further reduced to 0.67 μm, the total reduction rate was 91.6%, the friction coefficient was 0.590, and the friction resistance was further improved. Under laser irradiation, the total thickness of remelting zone, heat-affected zone and annealing zone is about 175 μm. The hardness and Young’s modulus of remelting zone and heat-affected zone are higher than those of substrate, while hardness and Young's modulus of annealed zone are slightly lower than those of substrate. The experimental results show that by optimizing the laser power, scanning speed, scanning distance and other parameters of continuous laser (P=190 W, v=30 mm/s, D=0.05 mm) and pulse laser (P=30 W, v=20 mm/s, D=0.04 mm), the dual laser polishing technology can significantly reduce the surface roughness of the material, effectively improve the surface hardness and Young's modulus, reduce the friction coefficient and wear amount of the material surface, and improve the friction resistance of the material surface. |
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