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Surface Selective Oxide Reduction During the Intercritical Annealing of Medium Mn Steel

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Abstract

Third generation advanced high-strength steels achieve an excellent strength–ductility balance using a cost-effective alloy composition. During the continuous annealing of medium Mn steel, the formation of an external selective oxide layer of MnO has a negative impact on the coating quality after galvanizing. A procedure to reduce the selective oxide was therefore developed. It involves annealing in the temperature range of 1073 K to 1323 K (800 °C to 1050 °C) in a HNx gas atmosphere. Annealing at higher temperatures and the use of larger H2 volume fractions are shown to make the gas atmosphere reducing with respect to MnO. The reduction of the surface MnO layer was observed by SEM, GDOES, and cross-sectional TEM analysis.

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Authors and Affiliations

  1. Materials Design Laboratory, Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam Gu, Pohang, 790-784, South Korea

    Kyoung Rae Jo, Lawrence Cho, Jong Han Oh & Bruno C. De Cooman

  2. Technical Research Laboratories, POSCO, Gwangyang, 545-090, South Korea

    Myoung Soo Kim & Ki Cheol Kang

Authors
  1. Kyoung Rae Jo
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  2. Lawrence Cho
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  3. Jong Han Oh
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  4. Myoung Soo Kim
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  5. Ki Cheol Kang
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  6. Bruno C. De Cooman
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Corresponding author

Correspondence to Bruno C. De Cooman.

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Manuscript submitted January 9, 2017.

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Jo, K.R., Cho, L., Oh, J.H. et al. Surface Selective Oxide Reduction During the Intercritical Annealing of Medium Mn Steel. Metall Mater Trans A 48, 3635–3641 (2017). https://doi.org/10.1007/s11661-017-4154-2

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  • DOI: https://doi.org/10.1007/s11661-017-4154-2

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