Fe-C系活度相互作用参数与温度的关系

实验测定了不同温度下,C在Fe-Mn熔体（xFe=0.102 3～0.789 9,xMn=0.055 1～0.638 0）中的溶解度。应用Gibbs-Duhem方程,结合实验结果,引用文献报道的实验数据,通过严格的热力学推导与计算,获得1448～2033 K范围适用的Fe-C系中εC^C,ρC^C和ρC^C,C与温度的关系式分别为εC^C=-3.016 8＋11 046.626 4/T,ρC^C=43.639 2-5 523.313 2/T和ρC^C,C=-28.087 2。计算结果表明,这些关系式既能满足Gibbs-Duhem方程的必要条件εC^C＋2ρC^C＋3ρC^C,C=0,又能满足C含量高时体系稳定的必要条件1＋εC^CxC＋2ρC^CxC^2≥0。

Relation between Activity Interaction Parameters in Fe-C System and Temperature

Carbon solubility in Fe-Mn melts （xFe=0.102 3～0.789 9,xMn=0.055 1～0.638 0） was measured experimentally at various temperature. Using Gibbs-Duhem equation, combining with the experimental results of this work, quoting experimental data reported in references, by strictly thermodynamieal derivation and calculation, the relation equations （at 1448-2033 K temperature range） between ε C ^C,ρ C^C and ρC^C,C in Fe-C system and temperature were obtained as follows εc^c =-3.016 8＋11 046.626 4/T,ρC^C=43.639 2-5 523.313 2/T and ρC^C,C = -28.087 2.The calculation results show that these relation equations can satisfy the necessary condition （εC^C＋2ρC^C,C ＋ 3ρC^C,C =0） for satisfying Gibbs-Duhem equation and the necessary condition （1＋εC^CxC ＋2ρ^C^CxC^2≥0） for satisfying stability condition of system at high carbon content.