Thermodynamic evaluation of reaction abilities of structural units in Fe–C binary melts based on atom–molecule coexistence theory

The reaction abilities of structural units in Fe–C binary melts over a temperature range above the liquidus lines have been evaluated by a thermodynamic model for calculating the mass action concentrations N i of structural units in Fe–C binary melts based on the atom–molecule coexistence theory (AMCT), i.e., the AMCT- N i model, through comparing with the predicted activities a R, i of both C and Fe by 14 collected models from the literature at four temperatures of 1833, 1873, 1923, and 1973 K. Furthermore, the Raoultian activity coefficient γ_C^0 of C in infinitely dilute Fe–C binary melts and the standard molar Gibbs free energy change Δ_sol G_m, C_dis . ( l)→ [ C]__w_[ C]= 1.0^Θ,% of dissolved liquid C for forming w [C] as 1.0 in Fe–C binary melts referred to 1 mass