激光熔覆制备了一种高硬度铁基涂层,涂层平均硬度约为775HV,未发现裂纹缺陷。对涂层显微组织进行表征,结果显示,涂层为均匀、细小的树枝晶组织形态,初生枝晶内为马氏体相,枝晶间为残余奥氏体相,残余奥氏体基体上弥散分布着颗粒状碳化物。枝晶间有Mo、Cr、W、Nb等元素偏聚,但涂层中的C元素分布均匀。枝晶间残余奥氏体存在大量层错,并在层错密集区有马氏体相析出。 Laser cladding prepared a high hardness iron-based coating, the average hardness of the coating was about 775HV, no crack defects were found. The microstructure of the coating was characterized. The results showed that the coating was uniform and fine dendritic microstructure. The primary dendrite was martensite phase and the dendrite was retained austenite phase. The residual austenite matrix Dispersed with granular carbide. Dendrites with Mo, Cr, W, Nb and other elements segregation, but the coating of C element distribution. Dendrite intergranular residual austenite there are a large number of faults, and in the fault zone dense martensite phase precipitation.