Journal
ACTA MATERIALIA
Volume 57, Issue 9, Pages 2781-2792Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.02.029
Keywords
Ferrite growth; Paraequilibrium; Local equilibrium; Kinetic transitions; Segregation
Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Tohoku University
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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.
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