Abstract
The thermodynamics of decomposition reactions of undercooled austenite in Fe-C alloys were studied using a regular solution sublattice model for austenite and ferrite and taking cementite as a stoichiometric compound. From a Gibbs free energy point of view intermediate transformations, not leading to stable phases, are possible: carbide formation above the A 1 temperature, and carbon enrichment in austenite below the A 1 temperature. The differences in chemical potential of Fe and of C between both sides of the transformation front were calculated as a function of the degree of transformation and related to the kinetics of transformation interface progress and carbon rearrangement, respectively
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