在球墨铸铁QT600-3表面激光熔覆铁基合金涂层,分析测试了激光熔覆层的微观组织、显微硬度以及界面处Fe、Cr元素的分布情况。结果表明:激光熔覆区为胞状晶和树枝晶结构,组织均匀致密,Fe、Cr等元素在熔覆层与母材间发生了相互扩散,形成良好的冶金结合,并有硬质点的弥散分布,使得涂层硬度大幅度提高,大约为基体硬度的2.6倍。 The iron-based alloy coating was laser cladding on the surface of QT600-3, the microstructure and microhardness of the laser cladding layer and the distribution of Fe and Cr at the interface were analyzed. The results show that the laser cladding zone is cellular and dendritic structure with uniform and compact structure. The elements such as Fe and Cr diffuse into each other between the cladding layer and the base metal to form a good metallurgical bond with a diffused hard point Distribution, making the coating hardness increased substantially, about 2.6 times the hardness of the substrate.