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中文摘要：
采用熔融玻璃净化法研究了深过冷Fe-Co合金的凝固组织演化规律．结果表明,随着熔体过冷度的增加,Fe100-x^-Cox（x=10-40）中除x=10的合金外,合金凝固组织都经历了两次晶粒细化过程;而当过冷度大于某一临界过冷度时,凝固组织不再是单相,而是出现了亚稳相．除了小过冷度下的组织转变以外,凝固组织转变过冷度以及亚稳相形成的临界过冷度随着Co含量的增加而增大．运用B-C-T模型和瞬态形核理论对凝固组织的演化规律进行了理论分析．
英文摘要：
Fe-Co melts with different Co contents were highly undercooled using fluxing purification method. With increasing the initial melt undercooling （AT）, grain refinement occurred twice in Fe100-x-Cox（x=10-40） alloy, except Fe90Co10. When undercooling of the melt exceeds the critical undercooling, the microstructure is no longer single phase and metastable phase appears. Except transition at low undercooling, both of the exact undercooling for microstructure transition and the critical undercooling for formation of metastable phase increase with the content of Co. Furthermore, B-C-T model and transient nucleation theory were applied to analyze the microstructure evolutions of Fe-Co alloy.
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