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铸钢的金相组织是否具有与轧材相似的切削性能是铸造切削刀具生产中的主要问题。本文研究了用稀土金属变性处理的钢水,可使脆性的共晶莱氏体网状组织分散,并使碳化物细化且均匀分布。处理中所用的变性剂是-1(14-5-78-76)、-1(14-5-50-74)、(14-139-88-77)和铈铁。用酸性感应炉熔化钢水,变性剂经破碎后外包铝箔,放在充满1/3浇包容量的钢水流中。变性剂的最佳加入量为钢水重量的0.2％,处理时的钢水温度为
It is a major problem in the production of foundry cutting tools that the metallurgical structure of cast steel has similar cutting performance to the rolled material. In this paper, the molten steel modified by rare earth metal is studied, which can disperse the brittle eutectic ledeburite and make the carbides refine and distribute uniformly. Denaturants used in the treatment are -1 (14-5-78-76), -1 (14-5-50-74), (14-139-88-77), and cerium iron. Melted molten steel with an acid induction furnace, denatured agent after the crushed aluminum foil, placed in a molten steel flow full of 1/3 ladle capacity. The best addition of denaturant is 0.2% of the weight of molten steel, the molten steel temperature is