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Based on a critical review on various experimentally measured phase relations and thermodynamic properties, a thermodynamic update of the Fe–Ni–C ternary system was firstly carried out by the CALPHAD (CALculation of PHAse Diagrams) method. The thermodynamic database of the Fe–Cr–Ni–C system was then established by extrapolating the description of the accepted ternary systems. No quaternary parameters were introduced in the present work. Good correspondence between calculated and experimental data has been achieved both in Fe–Ni–C and Fe–Cr–Ni–C systems. Eight as-cast alloys were studied to complement the solidification behaviors of the Fe–Cr–Ni–C system by X-ray diffraction analysis and scanning electron microscope. The solidification sequences and volume fractions of precipitated phases predicated from the modified Scheil-Gulliver solidification simulations agree reasonably with the presently measured data, which further validates the reliability of the present thermodynamic description.
•All experimental data in the Fe–Ni–C and Fe–Cr–Ni–C systems available in literatures were critically reviewed.•A better agreement with the experimental data was achieved using present thermodynamic description.•Solidification experiments simulations further validates the reliability of the present thermodynamic description.