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The therm odynamic database of the Fe-C-Mn-Si system has been developed in the framework of the CALPHAD approach. The sub-ternary system s have been carefully evaluated and revised based on available experim ental data. A satisfactory description of the liquid phase in the Fe-C-Si system has been obtained. The C-Mn-Si system w as assessed treating the liquid phase as a substitutional solution. Phase equilibria in the C-Mn-Si system,especially those involving the liquid phase,can be well described. B ased on the extrapolation of the experim ental data in the quaternary system, the Fe-Mn-Si system has been m odified to agree w ell w ith experim ental data at high tem peratures. The com parison betw een the calculated and m easured phase transform ation tem peratures confirm s the reliability of the present quaternary database. Additionally,the solidification process of Fe-0.1 6 C-1.5Mn-1.5 Si(wt. %) alloy was simulated by using the therm odynamic database developed.
The thermodynamic database of the Fe-C-Mn-Si system has been developed in the framework of the CALPHAD approach. The sub-ternary system has been evaluated and revised based on available experim ental data. A satisfactory description of the liquid Phase in the Fe-C-Si system has been obtained. The C-Mn-Si system w as measured treating the liquid phase as a substitutional solution. Phase equilibria in the C-Mn-Si system, especially those involving the liquid phase, B ased on the extrapolation of the experim ental data in the quaternary system, the Fe-Mn-Si system has been m odified to agree w ell w ith experim ental data at high te m peratures. The com parison betw een the calculated and m easured phase transform term tem peratures confirm s the reliability of the present quaternary database. Additionally, the solidification process of Fe-0.1 6 C-1.5Mn-1.5 Si (wt.%) alloy was simulated by using the thermodynamic database developed.