Abstract
A Model for coherent ferrite/M 2C carbide equilibrium is applied to AF1410 steel. The contribution fron coherent elastic energy to the Gibbs free energy has been expressed in a format compatible with the Redlich-Kister-Muggianu extrapolation formula for multicomponent phases. An equilibrium calculation at the standard tempering temperature of 510C predicts a substantial deviation from stoichiometry and a measurable solubility of iron in the M 2C phase, both of which have been verified experimentally.
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