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Kinetics of Delta-Ferrite to Austenite Phase Transformation in a Two-Phase Fe-Al-C Alloy

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Abstract

The kinetics of delta-ferrite to austenite phase transformation was investigated using a quenching dilatometer in a Fe-Al-C alloy. The results showed that the austenite phase nucleated along the delta grain boundaries. The transformed austenite morphology changed from cellular to Widmanstätten pattern when the holding temperature decreased from 1398 K to 1123 K (1125 °C to 850 °C). Full partitioning of the substitutional alloying elements was observed and the spacing of the austenite plates was controlled by the diffusing distance of the substitutional elements. Interestingly, growth of the austenite front was controlled by the long-range diffusion of carbon from the center of the delta grains to the growing front. Deformation of the delta phase enhanced the nucleation of austenite at existing grain boundaries and newly formed subgrain boundaries.

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Acknowledgments

Professor G.R. Purdy and Mr. J. Thomson, McMaster University, are gratefully acknowledged for valuable discussions. We are also grateful for the support of the McMaster Steel Research Centre, RIEM program, and CANMET Materials Technology Lab (Ottawa, Canada).

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Authors and Affiliations

  1. The Steel Research Centre, McMaster University, Hamilton, ON, L8S 4L7, Canada

    Tihe Zhou (Postdoctoral Fellow) & Hatem S. Zurob (Assistant Professor)

  2. The CANMET Materials Research Laboratory, Ottawa, ON, K1A 0G1, Canada

    Elachmi Essadiqi (Research Scientist) & Benoit Voyzelle (Research Scientist)

Authors
  1. Tihe Zhou
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  2. Hatem S. Zurob
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Correspondence to Hatem S. Zurob.

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Printed by permission of Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2011.

Manuscript submitted January 24, 2011.

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Zhou, T., Zurob, H.S., Essadiqi, E. et al. Kinetics of Delta-Ferrite to Austenite Phase Transformation in a Two-Phase Fe-Al-C Alloy. Metall Mater Trans A 42, 3349–3357 (2011). https://doi.org/10.1007/s11661-011-0747-3

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