The Effect of Alloy Elements on Formation and Morphology of Carbide in High carbon High Speed Steel

Two series (hypo eutectic and hyper eutectic) of new type high speed steel,which has high carbon,high vanadium,and metamorphic treatment features,were fabricated by casting.The effects of V,Nb,Mo on the formation and morphology of carbide were investigated.The results show that under the condition of increasing vanadium content to hyper eutetic,a large amount of dispersed fine MC type carbide can be obtained;Vanadium and Niobium compound addition can not obviously improve the carbide morphology;Increasing molybdenum content can improve the amount of layer M 2C type carbide,and increase the diameter of MC type carbide.