Abstract
A calculation of the variation with concentration of the diffusivity of carbon in austenite is given. Absolute rate theory is used to calculate the intrinsic jumping frequency of C-atoms located in differing atomic configurations in the austenite lattice. The relative concentrations of configurational groups, from which elementary diffusion jumps occur, is calculated by cumulant-moment expansions which utilize the C-C-nearest-neighbor interaction derived from the thermodynamic behavior of the system.
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