Diffusion of carbon in austenite

H. K. D. H. Bhadeshia

Abstract

The provided text describes a mathematical model developed by H. K. D. H. Bhadeshia to calculate the diffusion of carbon within the austenite phase of steel. This research addresses the challenge of predicting how carbon concentration and temperature influence diffusivity, especially in areas where experimental data is missing. By utilizing the Siller and McLellan method, the author accounts for chemical potential gradients and the repulsive forces that occur between neighboring carbon atoms. This theoretical approach proves more reliable than previous methods because it avoids certain restrictive assumptions regarding activation energy. The results demonstrate a strong correlation between calculated predictions and established experimental values across various conditions. Ultimately, the work allows for the accurate estimation of carbon movement at transformation interfaces, which is essential for analyzing the kinetic growth of steel structures.

Download: Journal of Materials Science, Vol. 17, 1982, pp. 383-386

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