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Modeling of kinetics of austenite-to-allotriomorphic ferrite transformation in 0.37C-1.45Mn-0.11V microalloyed steel

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Abstract

The present article is concerened with the theoretical and experimental study of the growth kinetics of allotriomorphic ferrite in medium carbon vanadium-titanium microalloyed steel. A theoretical model is presented in this work to calculate the evolution of austente-to-allotriomorphic ferrite transformation with time at a very wide temperature range. At temperatures above eutectoid temperature, where allotriomorphic ferrite is the only austenite transormation product, thesoft-impingement effect should be taken into account in the modeling. In that case, the Gilmouret al., analysis reliably predicts the progress of austenite-to-allotriomorphic ferrite transformation in this steel. By contrast, since pearlite acts as a carbon sink, the carbon enrichment of austenite due to the previous ferrite formation is avoided, and carbon concentration in austenite far from the α/λ interface remains the same as the overal carbon content of the steel. Hence, the soft-impingement effect should be neglected, and allotriomorphic ferrite is considered to grow under a parabolic law. Therefore, assumption of a semi-infinite extent austenite with constant boundary conditions is suitable for the kinetics of the isothermal decomposition of austenite. An excellent agreement (higher than 93 pct inR 2) has been obtained between the experimental and predicted values of the volume fraction of ferrite in all of the ranges of temperature studied.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, University of Cambridge, CB2 2 QZ, Cambridge, UK

    C. Capdevila

  2. Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), Madrid, Spain

    F. G. Caballero (Research Associate) & C. García de Andrés (Senior Research Fellow)

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  1. C. Capdevila
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  2. F. G. Caballero
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  3. C. García de Andrés
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Additional information

C. CAPDEVILA, Research Associate, formerly with the Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), 28040 Madrid, Spain

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Capdevila, C., Caballero, F.G. & García de Andrés, C. Modeling of kinetics of austenite-to-allotriomorphic ferrite transformation in 0.37C-1.45Mn-0.11V microalloyed steel. Metall Mater Trans A 32, 661–669 (2001). https://doi.org/10.1007/s11661-001-1001-1

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  • DOI: https://doi.org/10.1007/s11661-001-1001-1

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