A study of the diffusion of C in a high-C steel showed that the diffusivity of C in austenite was affected by the Si content. It was noted that the effect of Si which had been introduced into the steel during modification of the melt before casting was several times greater than that of Si which was already present in the steel. This appeared to be caused by the greater activity of so-called nascent Si atoms which appeared as a result of the dissociation of Si-containing compounds. The concentrations of C and Si had no effect upon the diffusivity of C in ferrite. On the basis of the parameters of the Snoek peak in the temperature dependence of the internal friction, the parameters of the Arrhenius equation were determined. The equation was valid for describing the diffusion data.

On the Diffusional Mobility of Carbon in Cast Hypereutectoid Steel. B.M.Drapkin, G.M.Kimstach, D.A.Urtaev: Physics of Metals and Metallography, 1999, 88[5], 515-7