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Study of Grain-Growth Kinetics in Delta-Ferrite and Austenite with Application to Thin-Slab Cast Direct-Rolling Microalloyed Steels

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Abstract

The high-temperature grain-growth kinetics in delta-ferrite and austenite is investigated. The delta-ferrite growth kinetics was observed directly on a model alloy that contained 2.5 wt pct aluminum in order to stabilize delta-ferrite down to room temperature. The gamma grain-growth kinetics was by etching the former austenite grain boundaries in a precipitate-free variant of APIX60 steel. At high temperatures and in the absence of precipitation, the growth kinetics in both delta-ferrite and austenite appeared to follow a simple parabolic growth law. The findings are applied to the problem of grain-size control during the process of thin-slab casting direct rolling (TSCDR).

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Notes

  1. The recrystallization treatment consisted of cold rolling followed by annealing at 1023 K (750 °C). The cold reduction steps were 30, 55, and 55 pct. The annealing times were 4 h after the first and second reductions and 8 h after the third reduction.

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Acknowledgments

Mr. J. Thomson, McMaster University, is gratefully acknowledged for valuable discussions. We are also grateful for the support of the McMaster Steel Research Centre.

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Authors and Affiliations

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

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

  2. Nucor Steel Decatur, LLC, Decatur, AL, 35609, USA

    Ronald J. O’malley (Plant Metallurgist)

Authors
  1. Tihe Zhou
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  2. Ronald J. O’malley
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  3. Hatem S. Zurob
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Correspondence to Hatem S. Zurob.

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Manuscript submitted September 17, 2009.

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Zhou, T., O’malley, R.J. & Zurob, H.S. Study of Grain-Growth Kinetics in Delta-Ferrite and Austenite with Application to Thin-Slab Cast Direct-Rolling Microalloyed Steels. Metall Mater Trans A 41, 2112–2120 (2010). https://doi.org/10.1007/s11661-010-0246-y

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