Abstract
A model has been developed for coarsening kinetics of M 2C carbides and subsequently applied to optimize the composition of high Co-Ni steels with respect to the overaging resistance during secondary hardening. The model accounts for both effects of multicomponent diffusion and precipitate shape anisotropy. It is found that W additions to high Co-Ni steels significantly reduces the coarsening rate constant. Calculations for two W-free 14Co-10Ni steels at a typical tempering temperature of 783K reveals a beneficial effect of the Cr substitution with Mo, in a good agreement with available experimental data.
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