Abstract
Conditions for the equality of diffusion potentials and for a fixed jump in grand canonical free energy across the phase interface have been used to evaluate coherent ferrite/M 2C carbide equilibrium in a series of high Co-Ni steels. Equilibrium calculations at the standard tempering temperature of 510C predict a substantial deviation from stoichiometry and a measurable solubility of iron in the M 2C phase, both of which have been verified experimentally. Present model has been compared with a previous treatment of the same equilibrium which was based on the addition of coherent elastic energy to the Gibbs free energy- Implications of observed discrepancies between the two approaches have been discussed.
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