为适合电子计算机进行计算,本文将各学者的ΔG_(Fe)~(γ→α)值公式化。应用各种ΔG~(γ→α)的计算模型,如经修正的Fisher,KRC和LFG模型,引入不同的ΔG_(Fe)~(γ→α)值,计算得到Fe-C合金的M_s温度。经比较后发现:M_s的计算值不仅取决于ΔG~(γ→α)的计算模型,而且极大地依赖于ΔG_(Fe)~(γ→α);若按照LFG模型并取Mogutnov的ΔG_(Fe)~(γ→α)值,和按照徐祖耀模型并取Kaufman的ΔG_(Fe)~(γ→α)值,计算所得结果均与M_s的实验值吻合得很好,而徐祖耀模型要比普遍公认的LFG模型简单得多。本文较精确地测定了x_C=0.01—0.05 Fe-C合金的M_s值,它们与Kaufman等人(1962)给出的数据很好吻合。Greninger所得x_C=0.06的M_s实验值看来是偏高的。驱动力的计算值不仅依赖于ΔG~(γ→α)的计算模型,而且还极大地取决于ΔG_(Fe)~(γ→α)值以及所选用的M_s值。计算表明:随含碳量的增加,相变驱动力将单调地增大。
In order to suit the calculation with computer, △G_(Fe)~(γ-α) from various authors are formulated. Ms from various △G_(Fe)~(γ-α) and different models for evaluation of △G_(Fe)~(γ-α), e. g. refined Fither, KRC, LFG and Hsu's are obtained. Comparison is made among these results. The calculated Ms depends on not only the evaluation model of △G~(γ-α) but also △G_(Fe)~(γ-α). Both LFG treatment with △G_(Fe)~(γ-α) from Mogutnov and Hsu's model with △G_(Fe)~(γ-α) from Kaufman et al. are in good agreement with the experimental M_s. However Hsu's model is much simpler than the general accepted LFG's M_s of Fe-C with x_c=0.01 to 0.05 are detected rather accurately and they are consistent with that given by Kaufman et al. Ms of Fe-C with x_c=0.06 by Greninger seems too high. The calculated driving force depends on not only the evaluation model of △G~(γ-α) but also mainly △G_(Fe)~(γ-α) and M_s adopted. It is more likely that the driving force increases with the increament of carbon content.
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