Carbon solubility in FeMn melts (xFe=0102 3-0789 9, xMn=0055 1-0638 0) was measured experimentally at various temperatures. Using GibbsDuhem equation, in combination with the experimental results in this work, quoting experimental data reported in references, and by strict thermodynamic derivation and calculation, the relation equations between the activity interaction parameters in FeC system and temperature were obtained. The calculation equation of lnγFe in FeC system was also obtained. The calculated results show that these relation equations can be used to calculate the activity coefficients of carbon and iron in FeC system and can satisfy the necessary condition to satisfy GibbsDuhem equation and the necessary condition to satisfy the stability condition of system at high carbon content. The calculation formula for lnγC in FeMnC system was also obtained.
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