| WANG Bin,GUO Yan-bao,ZHANG Zheng,WANG Jing-xin,WANG De-guo.Effect of Laser Processing Parameters on Surface Micro-texture Quality of Invar 36 Alloy[J],52(9):397-407 |
| Effect of Laser Processing Parameters on Surface Micro-texture Quality of Invar 36 Alloy |
| Received:August 26, 2022 Revised:February 06, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.036 |
| KeyWord:fiber laser Invar 36 alloy surface micro-texture friction and wear |
| Author | Institution |
| WANG Bin |
China University of Petroleum, Beijing , China |
| GUO Yan-bao |
China University of Petroleum, Beijing , China |
| ZHANG Zheng |
China University of Petroleum, Beijing , China |
| WANG Jing-xin |
China University of Petroleum, Beijing , China |
| WANG De-guo |
China University of Petroleum, Beijing , China |
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| Abstract: |
| Fiber laser surface micro-texture technology is an advanced surface modification technology, which can improve surface characteristics, such as wear resistance, oxidation resistance and corrosion resistance, without changing the properties of the matrix material. However, laser processing parameters directly affect the width and depth of micro-texture and heat loss effect. Therefore, with the aim of improving the processing efficiency and quality of laser micro-texture, the processing parameters for Invar 36 alloy materials were investigated and optimized by using the orthogonal experiment method. In this paper, the effects of laser power, frequency, scanning speed, and scanning times on the size and quality of micro-texture were studied. In order to ensure the rationality and feasibility of this study, the laser micro-texture parameters were optimized by the orthogonal experiment method. The machined surface quality was characterized by 3D surface topography and a scanning electron microscopy (SEM). According to the characterization and orthogonal experimental results, it could be seen that a single micro-texture presented a pit shape similar to a rounded truncated frustum, and the texture edge and the surface junction maintained a high flatness. According to the machining quality of the micro-texture surface, several indexes such as diameter, depth, the height of irregular bulge height, and surface roughness were set, and their surface properties were further evaluated by friction and wear tests. The results showed that the machining quality of micro-texture grooves had a greater relationship with the number of laser scanning and scanning velocity. With the increase of the number of laser scanning, the depth of micro-texture increased obviously, but its diameter decreased gradually. With the rise of scanning times in the range of 5-15, the irregular bulge height of melt on the micro-texture surface and edge was gradually flattened. The laser scanning velocity was proportional to the width of the micro-texture groove but inversely proportional to the diameter of the micro-texture groove and the height of the height irregular bulges. In addition, when the laser scanning times were 15 and the laser scanning rate was in the range of 400-500 μm/s, the surface roughness of the micro-texture was lower. In addition, the tribological test method was designed to test the surface properties of the friction pair under the corresponding parameters. The results showed that when the laser scanning velocity was between 400-500 μm/s, the friction coefficient decreased with the increase of laser scanning velocity. However, when the laser scanning velocity continued to increase to 600 μm/s, the friction coefficient increased significantly, and the friction coefficient curve fluctuated wildly. In addition, when the laser scanning velocity was in the range of 400-500 μm/s, the wear rate of the friction pair decreased significantly with the increase of the laser scanning speed. When the laser scanning speed was 500 μm/s and the number of laser scanning was 15, compared with the wear rate under the condition of no micro-texture, the wear rate was the lowest. Therefore, under the appropriate laser processing parameters (P=0.04 W, f=20 kHz, v=500 μm/s, n=15), the micro-texture groove is more conducive to collecting the abrasive particles generated by the surface wear of the friction pair in the sliding friction process, which can not only reduce the possibility of abrasive wear, but also reduce the friction coefficient and wear rate of the friction pair to a certain extent. In addition, the tribological properties of Invar 36 alloy can be effectively improved and its service life can be extended. |
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