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.

在对各种实验测量的相关系和热力学性质进行严格审查的基础上，首先通过CALPHAD（PHHAse图的计算）方法对Fe-Ni-C三元体系进行了热力学更新。然后，通过外推公认的三元体系的描述，建立Fe–Cr–Ni–C系统的热力学数据库。在当前工作中没有引入四元参数。在Fe–Ni–C和Fe–Cr–Ni–C系统中，已获得计算数据与实验数据之间的良好对应关系。通过X射线衍射分析和扫描电子显微镜研究了八种铸态合金，以补充Fe–Cr–Ni–C系统的凝固行为。