王斌,郭岩宝,张政,王经鑫,王德国.激光加工工艺参数对Invar 36合金表面微织构质量的影响[J].表面技术,2023,52(9):397-407.
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].Surface Technology,2023,52(9):397-407 |
| 激光加工工艺参数对Invar 36合金表面微织构质量的影响 |
| Effect of Laser Processing Parameters on Surface Micro-texture Quality of Invar 36 Alloy |
| 投稿时间：2022-08-26 修订日期：2023-02-06 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.036 |
| 中文关键词: 光纤激光 Invar 36合金 表面微织构 摩擦磨损 |
| 英文关键词:fiber laser Invar 36 alloy surface micro-texture friction and wear |
| 基金项目:国家自然科学基金(51875578)。 |
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| Author | Institution |
| WANG Bin | China University of Petroleum, Beijing 102249, China |
| GUO Yan-bao | China University of Petroleum, Beijing 102249, China |
| ZHANG Zheng | China University of Petroleum, Beijing 102249, China |
| WANG Jing-xin | China University of Petroleum, Beijing 102249, China |
| WANG De-guo | China University of Petroleum, Beijing 102249, China |
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| 中文摘要: |
| 目的 提高微织构的加工效率和加工质量，为改善Invar 36合金的表面性能及微织构加工工艺参数提供理论依据。方法 为了保证该研究的合理性和可行性，采用光纤激光加工技术并结合正交试验法研究了激光功率，激光频率，激光扫描速度和扫描次数4种不同加工参数对微织构凹槽表面形貌结构尺寸及加工质量的影响，并通过摩擦学试验方法测试了其对应的摩擦学性能。最后，通过三维形貌测试仪和扫描电子显微镜对微织构加工结果进行测量表征。结果 微织构凹槽的加工质量与激光扫描次数和扫描速度的关系更大，随着激光扫描次数的增加，微织构的深度明显增加，但是其宽度逐渐减少。当扫描次数在5~15次时，随着扫描次数的增加，微织构表面及边缘熔融物不规则凸起逐渐平整。激光扫描速度与微织构凹槽的宽度成正比，但是与微织构凹槽的深度及边缘不规则凸起的高度成反比关系。此外，当激光扫描次数为15次，激光扫描速率为400~500 μm/s时，加工的微织构表面粗糙度更低，且根据摩擦试验结果，发现该条件下加工的微织构摩擦副的减摩耐磨效果更佳。结论 激光扫描次数和激光扫描速度是影响凹槽型微织构加工质量和表面性能的关键因素，试验结果表明在适当的激光加工工艺参数下(P=0.04 W，f=20 kHz，v=500 μm/s，n=15)微织构凹槽具有较高的加工质量，从而有效改善Invar 36合金的摩擦学性能，对未来进一步提高Invar 36合金的表面性能及加工质量具有一定的指导意义。 |
| 英文摘要: |
| 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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