Stationary and quasistationary models of carbon redistribution in austenitic steel weldments

In this IInd part of our paper (Czech. J. Phys. B35 (1985) 1355) the analysis of carbon uphill diffusion data is presented. The analysed data were measured in the polycomponent steel weldments. All of the data satisfy well the conditions for stationary model application. On the basis of the present analysis the carbon diffusivities (D₁^*) appertaining to a non-alloyed austenite, the activity (_C^s) and diffusion (_C^s) interaction coefficients are evaluated. A Si anomaly in Darken's experiments is observed and discussed. On the contrary to the other substitutional elements Mn, Cr and Mo, which decrease simultaneously C-activity and C-diffusivity, silicon increases the carbon activity and, at the same time, decreases its diffusivity in the Fe-C-X_s austenitic solid solutions.