Modelling Precipitation of Niobium Carbide in Austenite: Multicomponent Diffusion, Capillarity and Coarsening

N. Fujita and H. K. D. H. Bhadeshia


The growth of niobium carbide in austenite involves the diffusion of both niobium and carbon. These elements diffuse at vastly different rates. A model is presented for the overall transformation kinetics of niobium carbide precipitation in austenite, which takes into account the multicomponent nature of the diffusion process whilst at the same time allows for the curvature of the transformation front. The inclusion of the curvature (capillarity) effect has, in a numerical scheme, permitted the precipitation and coarsening reactions to be treated in a single model. The model is compared against published experimental data.

Materials Science and Technology, Vol. 17, 2001, 403-408.

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