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W6Mo5Cr4V2高速钢连铸坯退火后的主要碳化物为M_6C、MC、M_(23)C_6、M_7C_3及M_2C。碳化物总量为金属量的15—19％,其中M_6C+MC约占碳化物总量的80％以上,M_(23)C_6+M_7C_3占13％左右,M_2C极微。碳化物在铸坯中分布极不均匀,从边沿到中心碳化物聚集程度有增加的趋势,在靠近中心的V形及中心偏析区内,碳化物聚集最严重。铸坯中出现的典型共晶碳化物形貌为片层状及羽毛状,遍及整个铸坯,约占95％左右,在铸坯中部元素富集的偏析区内,出现了鱼骨状及蜂窝状的共晶碳化物,前者为高钨的共晶碳化物,而后者为高钒、高钨、钼的共晶碳化物,估计是VC及M_2C共晶碳化物的混合体。减少偏析的措施均能减轻碳化物的聚集。文中提出了改进工艺的措施。
The main carbides of W6Mo5Cr4V2 HSS after annealing were M_6C, MC, M_ (23) C_6, M_7C_3 and M_2C. The total amount of carbide is 15-19% of the amount of metal, of which M_6C + MC accounts for more than 80% of the total amount of carbides, M_ (23) C_6 + M_7C_3 accounts for about 13% and M_2C is very slight. Carbides distribute unevenly in the slab, and the degree of carbide aggregation tends to increase from the edge to the center. In the near-center V-shape and center segregation zone, the carbide is most aggregated. The typical eutectic carbides present in the billet are lamellar and feathery throughout the billet, accounting for about 95%. In the segregation zone enriched with elements in the central part of the billet, there are fishbone and honeycomb Like eutectic carbides, the former being eutectic carbides of high tungsten and the latter eutectic carbides of high vanadium, high tungsten and molybdenum, estimated to be a mixture of VC and M 2 C eutectic carbides. Measures to reduce segregation reduce the accumulation of carbides. The paper proposed measures to improve the process.