Type and Morphology of Carbide in Spray Formed High Speed Steel

The type and morphology of carbide in spray formed high speed steel (HSS) were studied by means of OM,SEM,XRD,EPMA,AFM.The results show that the microstructure of spray formed HSS was fine and homogeneous equiaxed grain.There were two types carbides in spray formed HSS,M6C and MC.The bone-shape M6C carbides distributed along grain boundaries,the lager MC carbides distributed in the junction of grain boundaries,the fine bamboo shoot-shape MC carbides distributed inside the grains.