Abstract
In this work thermodynamic equilibria for a Fe-Cr-Mo-Ni-C system were calculated and compared with those determined experimentally in examined austenitic stainless steels. Calculations of equilibria were realized by means of PD-pp software package in temperature range 850-1350 K. Modelling of thermodynamic equilibria is based on the Hillert-Staffansson sublattice model. The M₂₃C₆ carbide was experimentally found to be the most stable phase. On the other hand, intermetallic phases σ and Laves are present in equilibria at lower temperatures only. The M₆C carbide is in thermodynamic equilibrium only in the steel with the highest carbon content. Performed calculations are in reasonable agreement with experiment.

Key words
Hillert-Staffansson sublattice model, phase equilibria, austenitic steel

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