Thermodynamic description of the Fe–Mn–Nb–C system

In the present work the thermodynamic parameters of the Fe–Mn–Nb–C system are assessed with CALPHAD technique using computerized optimization procedure (PARROT). ptions for most of the binary and ternary systems are already available so a selection between sets of parameters was made. An additional reassessment was needed for the Fe–Nb system for the better description of experimental data on the solubility of NbC in fcc Fe in the Fe–Nb–C system. The description of the Fe–Mn–Nb–C system was made as an extrapolation from ternary systems. The obtained set of parameters was tested against existing experimental data on NbC solubilities.