The diffusivity of C at 1273K, in solid solutions of these elements, was determined by measuring the initial graphite precipitation temperature at the interface, between regions of low and high C content, during cooling. That is, when 2 samples of the same metal but with differing C concentrations were brought into contact and held isothermally, C diffusion occurred across the interface between the samples (from the alloy with the higher C content to the alloy with the lower C content). The resultant C concentration profile in the area of the interface was a function of the initial C concentrations, the annealing temperature and the annealing time. Analysis of the present results showed that the diffusivity was independent of the C concentration.

V.N.Lnyanoi, Z.A.Matysina, S.J.Zaginaichenko: Metallurgical and Materials Transactions B, 1995, 26[1], 179-81