Abstract: According to measured solubility data of Thermo-Calc and concerned references, the equilibrium solid solubility formulae of Fe₄N in austenite and in ferrite have been derived respectively as log[N] _γ= 0.940 -479.4/T and log[N]_α= 1.074 - 1 838/T. With considering free energy of Fe₄N formation, the equilibrium solid solubility formulae of nitrogen (gas) in austenite and in ferrite have been derived respectively as log[N] _γ= -2.752 + 1 321/T and log[N] _α= -1.560-1 214/T.

摘要： 根据Thermo-Calc和相关文献的测试数据,推导出Fe₄N在奥氏体和铁素体中的平衡固溶度公式分别：log[N]_γ= 0.940 - 479.4/T, log[ N]_α= 1.074 - 1 838/T。 同时考虑Fe₄N的形成自由能而推导出氮(气)在奥氏 体和铁素体中的平衡固溶度公式分别为：log[N]_γ= -2.752 + 1321/T, log[N]_α= -1.560-1214/T。