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

Perez, Michel and Courtois, E. and Acevedo , D. and Epicier , T. and Maugis, Philippe Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling. (2007) Philosophical Magazine Letters , vol. 87 (n° 9). pp. 645-656. ISSN 0950-0839

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Official URL: http://dx.doi.org/10.1080/09500830701427003

Abstract

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 substoichiometric 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.

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. The definitive version is available at http://www.informaworld.com/ The original PDF of the article can be found at Philosophical Magazine Letters website : http://www.tandf.co.uk/journals/titles/09500839.asp
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Arcelor Mittal Research (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Institut National des Sciences Appliquées de Lyon - INSA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:16 Oct 2009 07:37

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