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将合金元素在珠光体相变时无分配状态下形成的含Ｓｉ合金渗碳体做为一种介稳相处理，利用规则溶液亚点阵模型和有关文献中的数据，计算了含Ｓｉ合金渗碳体相对于无Ｓｉ渗碳体的自由能增量δＧＦｅ３ＣＳｉ，得到了渗碳体中含Ｓｉ量和δＧＦｅ３ＣＳｉ的对应关系；并利用Ｓｉ在不同温度下的分配系数，计算了Ｓｉ对ＦｅＣ合金介稳态γ／［γ＋Ｆｅ３Ｃ］相界碳浓度（Ａ′ｃｍ）的影响。所得结果认为，含Ｓｉ过共析钢珠光体转变时在原奥氏体晶界出现连续网状铁素体，是Ｓｉ增加含Ｓｉ渗碳体自由能，从而提高了介稳态γ／［γ＋Ｆｅ３Ｃ］相界碳浓度（Ａ′ｃｍ）的结果。
The cementite containing Si formed by the alloying element without any distribution during the pearlite transformation was treated as a metastable phase. Using the sub-lattice model of the regular solution and the data in the literature, With respect to the free energy increment δGFe3CSi of the non-Si cementite, the corresponding relationship between the Si content and the δGFe3CSi in the cementite was obtained. Based on the distribution coefficient of Si at different temperatures, the effect of Si on the FeC alloy Influences of metastable γ / [γ + Fe3C] phase boundary carbon concentration (A’cm). The results show that the continuous mesh-like ferrite appears at the original austenite grain boundary during the transformation of Si-containing hypereutectoid pearlite, which increases the free energy of Si-containing cementite by Si and increases the metastable γ / [γ + Fe3C] Phase boundary carbon concentration (A’cm) results.