Wang Qianjie, Shu Xuedao, Xu Haijie, Xu Sheng, Zhang Song
Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315221, China.
School of Information and Intelligent Engineering, Ningbo City College of Vocational Technology, Ningbo 315221, China.
Materials (Basel). 2024 Dec 13;17(24):6098. doi: 10.3390/ma17246098.
To address the issue of cracking in aluminum extrusion dies during operation, this study employs laser cladding technology to modify the surface of these dies. This modification aims to enhance their hardness and friction resistance. Laser cladding technology was utilized to coat the surface of H13 steel with Stellite 12, a cobalt-based alloy, at varying laser power levels. The surface formation quality, microstructural organization, phase composition, microhardness, and wear resistance of the coatings were investigated using optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction (XRD), microhardness testing, and confocal microscopy. The results indicated that as the laser power increased, the surface formation quality of the coating gradually improved, while the dilution rate of the coating increased. Changes in the phase composition and microstructure were not significant, and both microhardness and wear resistance initially increased before decreasing. Optimal process parameters for achieving good surface formation quality, high microhardness, and strong wear resistance were found to be a laser output power of 2200 W, scanning speed of 10 mm/s, feeding rate of 1.2 r/min, and overlap rate of 40%. The results indicate that the coating applied to the surface of H13 steel using Stellite 12 enhances the performance of aluminum extrusion dies.
为解决铝挤压模具在运行过程中的开裂问题，本研究采用激光熔覆技术对这些模具的表面进行改性。这种改性旨在提高其硬度和耐磨性。利用激光熔覆技术在不同激光功率水平下，用钴基合金司太立12对H13钢表面进行涂层处理。采用光学显微镜、扫描电子显微镜、能谱分析、X射线衍射（XRD）、显微硬度测试和共聚焦显微镜对涂层的表面成形质量、微观组织、相组成、显微硬度和耐磨性进行了研究。结果表明，随着激光功率的增加，涂层的表面成形质量逐渐提高，而涂层的稀释率增加。相组成和微观结构的变化不显著，显微硬度和耐磨性均先升高后降低。获得良好表面成形质量、高显微硬度和强耐磨性的最佳工艺参数为激光输出功率2200W、扫描速度10mm/s、送粉速率1.2r/min和搭接率40%。结果表明，用司太立12涂覆在H13钢表面的涂层提高了铝挤压模具的性能。
