Stationary and quasistationary models of carbon redistribution in austenitic steel weldments

In this paper models describing carbon redistribution in austenitic steel weldments are presented. The stationary model (SM) is based on the assumption that the substitutional atoms do not diffuse, they are stationary. The quasistationary model (QSM) describes the C-redistribution even in the case in which the substitutional atoms diffuse in a narrow interval which is situated in the neighbourhood of the weldment interface. In developing the models the following assumptions were used: The driving force of carbon diffusion is the gradient of the chemical potential in which the C-C interaction is not taken into account (_C^C = 0); the molar volumes of the solid solutions under consideration are the same and constant in both parts of the weldment; the Kirkendall effect does not occur.