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Kinetics of vanadium carbonitride precipitation in steel: A computer model

Maugis, Philippe and Gouné, Mohamed Kinetics of vanadium carbonitride precipitation in steel: A computer model. (2005) Acta Materialia, vol. 5 (n° 12). pp. 3359-3367. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2005.03.036

Abstract

We have constructed a computer model of the precipitation kinetics of vanadium carbonitride in steel that takes into account the composition evolution of the precipitates with time. The model takes advantage of the fast diffusion of nitrogen and carbon compared to niobium to derive the composition, size and rate of formation of the precipitates during their nucleation. A local equilibrium condition is used at the precipitate–matrix interface to derive the growth rate of each precipitate as a function of its size and the current matrix composition. Coarsening occurs naturally on account of the Gibbs–Thomson capillarity effect. For isothermal heat treatments, the calculations show that the precipitates nucleate as almost pure vanadium nitrides. They subsequently grow at the expense of solute nitrogen. When nitrogen is exhausted, the solute carbon precipitates and progressively transforms the nitrides into carbonitrides. The coarsening stage leads to a steady-state size distribution of niobium carbonitrides of the equilibrium composition.

Item Type:Article
Additional Information:http://www.elsevier.com/wps/find/journaldescription.cws_home/221/description#description
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
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Thomas Bonnecarere

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