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Article Dans Une Revue Philosophical Magazine Letters Année : 2007

Precipitation of niobium carbonitrides in ferrite: Chemical composition measurements and thermodynamic modelling

Résumé

High-resolution transmission electron microscopy and electron-energy loss spectroscopy have been used to characterize the structure and chemical composition of niobium carbonitrides in the ferrite of a Fe-Nb-C-N model alloy at different precipitation stages. Experiments seem to indicate the coexistence of two types of precipitates: pure niobium nitrides and mixed sub-stoichiometric niobium carbonitrides. In order to understand the chemical composition of these precipitates, a thermodynamic formalism has been developed to evaluate the nucleation and growth rates (classical nucleation theory) and the chemical composition of nuclei and existing precipitates. A model based on the numerical solution of thermodynamic and kinetic equations is used to compute the evolution of the precipitate size distribution at a given temperature. The predicted compositions are in very good agreement with experimental results.

Domaines

Matériaux
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Dates et versions

hal-00434161 , version 1 (20-11-2009)

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  • HAL Id : hal-00434161 , version 1

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Michel Perez, Eglantine Courtois, Daniel Acevedo-Reyes, Thierry Epicier, Philippe Maugis. Precipitation of niobium carbonitrides in ferrite: Chemical composition measurements and thermodynamic modelling. Philosophical Magazine Letters, 2007, pp.645-656. ⟨hal-00434161⟩
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