选用K4169Fe—Ni基高温合金，研究了向熔体中加入NixAlyTiz金属间化合物对合金冷凝后的晶粒尺寸、枝晶组织等凝固组织特征的影响结果表明，加入微量NixAlyTiz细化剂并控制合金液的均匀化处理过程可显著细化晶粒，将铸件整体晶粒细化至0、1—02mm；达到ASTM1—3级,同时、枝晶组织出现了由树枝晶向胞状晶的转变、并且NixAlyTiz细化剂的加入对合金的结晶特性及凝固组织无不良影响.
Grain size and dendrite morphologies of Fe-Ni based superalloy K4169 were investigated with the melt addition of NixAlyTiz refiner. It is found that the grain size of ingotscan be refined obviously to 0.1-0.2mm, close to the order of ASTM 1-3, by lowering the melting homogeneous treatment temperature during the melting and casting process. In addition, the microstructure of grains can be transferred from dendritic to cellular due to the addition ofrefiner at the same cooling condition. The addition of NixAlyTiz refiner has the advantages of little influence on the freezing characters, alloy composition as well as phase constitution.
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