激光熔覆铁基涂层工艺参数的研究

以激光熔覆铁基涂层为研究对象，在MM-P2屏显式摩擦磨损试验机上进行摩擦磨损对比实验，分析了不同工艺参数下熔覆层形貌及熔覆涂层后磨损量的变化关系.结果表明:熔覆涂层后的表面硬度均在62HRC以上，远高于基体的硬度；熔覆层的形貌和质量主要影响因素是扫描速度，激光功率次之，并在此基础上采用能量密度进行表征，能量密度为60 J/mm2左右时的耐磨性最好，其最佳组合工艺参数为激光功率3.2 kW左右、扫描速度300 mm/min左右.激光功率过高，扫描速度过快都会导致熔覆层耐磨性能下降. 

Process parameters of laser cladding iron-based coating iron-based coating

Comparative experiments of friction and wear were performed on MM-P2-screen friction and wear tester using laser cladding iron-based coating as the object of study. The morphology of cladding layer under different process parameters were studied by analyzing the changes of wear amount and cladding coating. The results show that the surface hardness are above 62 HRC after cladding coating, far higher than the hardness of substrate. Scanning speed and laser power are the most important factors affecting the morphology and quality of cladding layer. Energy density characterization results show the best abrasion resistance occurs when the energy density is around 60 J/mm2. The scope of the optimal process parameters are: laser power approximately 3.2 kW, the scanning speed around 300 mm/min. The results show that too high laser power and scanning speed also decrease the abrasion resistance of cladding layer.