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Growth Kinetics of Proeutectoid Ferrite in Fe-0.1C-1.5Mn-1Si Quaternary and Fe-0.1C-1.5Mn-1Si-0.2Al Quinary Alloys

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Abstract

The growth kinetics of proeutectoid ferrite in the early stages of transformation were studied in Fe-0.1C-1.5Mn-1Si (mass pct) quaternary and Fe-0.1C-1.5Mn-1Si-0.2Al quinary alloys. The observed kinetic transition temperatures from partitioned slow growth to unpartitioned fast growth of ferrite in both alloys are in good agreement with predictions using a local equilibrium model for multicomponent systems. The measured parabolic growth rate constants were smaller than those calculated assuming paraequilibrium in the unpartitioned growth region, but the difference between the measured and the calculated growth rate constants gradually diminished with a decreasing reaction temperature. The dissipation of driving force, derived from the diffusion of the substitutional solute within the transformation interface, possibly constitutes a major part of the discrepancy between the measured and the calculated growth kinetics.

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Notes

  1. The Wagner’s interaction parameter in austenite between the ith and jth solutes is defined as \( \varepsilon_{ij} = \lim_{{x_{\text{Fe}} \to 1}} \frac{{\partial \ln \gamma_{i} }}{{\partial x_{j} }} \), where γ i is the activity coefficient of the ith solute in austenite. In view of the lack of experimental data, ∂lnγ i /∂x j was calculated using ThermoCalc software as a crude estimate. Assuming ε ij is inversely proportional to the temperature,[33] the temperature dependence of ε ij was obtained via regression analysis.

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Acknowledgments

G.H. Zhang is grateful to professor N.J. Kim for the provision of laboratory facilities at GIFT, POSTECH. D.W. Suh appreciates the financial support from POSCO through Steel Innovation Program. The authors are grateful to Professor H.K.D.H. Bhadeshia for careful reading of this manuscript.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    G. H. Zhang (Postdoctoral Fellow) & D. W. Suh (Assistant Professor)

  2. Department of Materials Science and Engineering, Ibaraki University, Hitachi, 316-8511, Japan

    R. Wei (Graduate Student) & M. Enomoto (Professor)

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  1. G. H. Zhang
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  2. R. Wei
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  3. M. Enomoto
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  4. D. W. Suh
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Correspondence to G. H. Zhang.

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Manuscript submitted July 13, 2011.

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Zhang, G.H., Wei, R., Enomoto, M. et al. Growth Kinetics of Proeutectoid Ferrite in Fe-0.1C-1.5Mn-1Si Quaternary and Fe-0.1C-1.5Mn-1Si-0.2Al Quinary Alloys. Metall Mater Trans A 43, 833–842 (2012). https://doi.org/10.1007/s11661-011-1000-9

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