Abstract
In the present paper the results of measurements of carbon diffusion coefficients in Fe-C-Cr-Mn-Si steels are reported. The diffusion anneals were carried out at temperatures 900-1100 °C in ambient air. The measurement of carbon concentration in subsurface layers of oxidized samples and the metallographic investigation have shown that the steels expressively decarburize in the course of oxidation. The evaluation of measured carbon concentration curves N(x,t) yielded the diffusion coefficients D of carbon. They depend on temperature T and on chemical composition of steels. The dependence of D on the concentration of alloying elements i is expressed by the use of diffusion interaction coefficients βⁱ_C.

Key words
carbon diffusion coefficients, Fe-C-Cr-Mn-Si steels, metallographic investigation

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