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Article Dans Une Revue Acta Materialia Année : 2009

Kinetic transitions during non-partitioned ferrite growth in Fe-C-X alloys

Résumé

Ferrite growth behavior in Fe-C-Mn alloys has been Studied using controlled decarburization experiments. The recently reported transition from LENP (local equilibrium-negligible partitioning) kinetics, at lower temperatures, to PE (paraequilibrium) kinetics, at higher temperatures, is shown to behave self-consistently over a range of Mn contents and temperatures and long-lived intermediate states between LENP and PE persist over a well-defined range of temperature and composition. A simple model which quantitatively describes the experimental observations over a range of composition and temperature is proposed. A key feature of this model is the introduction of an alloying element capacity of the moving alpha/gamma interfaced X-Mn*. The introduction of this quantity is purely guided by the experimental data and, at present, there is no physically based method for calculating it. Once X-Mn* is defined, multiple-jump kinetic analysis quantitatively describes the experimental observations over an impressive range of growth behaviors. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Dates et versions

hal-00428653 , version 1 (29-10-2009)

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Citer

H. S. Zurob, C. R. Hutchinson, Y. Brechet, H. Seyedrezai, G. R. Purdy. Kinetic transitions during non-partitioned ferrite growth in Fe-C-X alloys. Acta Materialia, 2009, 57 (9), pp.2781-2792. ⟨10.1016/j.actamat.2009.02.029⟩. ⟨hal-00428653⟩

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