Abstract
The Central Atoms Model generalized to multicomponent solutions is placed in a form which permits direct application to the evaluation of α-γ phase equilibria in Fe-C-X alloys. From the activity expressions thus obtained the ortho- and paraequilibrium phase boundaries are calculated for five of these alloys, where X is successively Mn, Ni, Co, Si and Mo. The results are generally in good agreement with the calculations made from the Hillert-Staffanson regular solution model and the available experimental data on orthoequilibrium γ/( α + γ) phase boundaries. The model is then used to calculate the free energy change associated with the proeutectoid ferrite reaction in the same ternary systems.
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