Abstract
The kinetic theory of diffusion phase transformations is used to calculate the time it takes for the ɛ phase to form in Fe-Cu alloys at various temperatures. The fine structure and hardness of alloys containing from 0.6 to 5.5 at % Cu and aged in the martensite state are studied. The calculated and experimental data are in good agreement. The cooling rate of copper-bearing alloys that provides the maximum hardness upon the precipitation of ɛ-phase particles of a given size is estimated.
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