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以AZ31B镁合金为对象,对其进行CO2气体激光表面熔凝处理,采用金相观察、X射线衍射分析、硬度测试及摩擦磨损试验等手段,研究了激光熔凝层及原始镁合金的微观组织结构及磨损性能。激光功率P=3 300W,扫描速度v=360m/s时熔凝层是由α-Mg和β-Mg17Al12组成,且熔凝层的相含量比母材多。熔凝层的微观组织以树枝晶为主,枝晶组织发生了明显的细化。由于细晶强化、固溶强化和析出强化的共同作用,熔凝层的显微硬度提高了大约2倍。原始镁合金的磨损以磨粒磨损和氧化磨损为主,而熔凝层以磨粒磨损为主,熔凝层的耐磨损性能也得到了改善。
AZ31B magnesium alloy as the object, its CO2 gas laser surface melting treatment, the use of metallographic observation, X-ray diffraction analysis, hardness test and friction and wear tests and other means to study the laser cladding layer and the original magnesium alloy microstructure Structure and wear properties. Laser power P = 3 300W, scanning speed v = 360m / s when the melting layer is composed of α-Mg and β-Mg17Al12, and the melting layer phase content than the base material. The microstructure of the fused layer mainly dendrite, dendritic organization has been significantly refined. Due to the combination of fine grain strengthening, solid solution strengthening and precipitation strengthening, the microhardness of the fused layer is increased by about 2 times. The wear of the original magnesium alloy is mainly abrasive wear and oxidation wear, while the abrasive layer is mainly abrasive wear, and the wear resistance of the fused layer is also improved.