The results show that matrix steel 65Nb is ledeburite, the eutectic morphology is platelike, the photomicrograph of cast structure of 65Nb matrix steel is similar to M2 high-speed steel.

• 证明了基体钢是莱氏体钢；共晶体形态为层片状；铸态组织结构与W6Mo5Cr4V2高速钢相似.