选用K4169铁-镍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.结果发现,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K4169铸件整体晶粒细化至0.1～0.2mm,达到ASTM 1～3级,同时,枝晶组织和MC型碳化物也有明显变化.而且,本研究选用的NixAlyTiz细化剂由于其成分特点对合金的结晶特性及凝固组织无不良影响.因此可认为,加入微量的NixAlyTiz细化剂是获得K4169高温合金细晶铸件的有效方法.
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