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Phase Transformation of Thermally Grown FeO Formed on High-Purity Fe at Low Oxygen Potential

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Abstract

The isothermal phase transformation behavior of thermally grown oxide scale of FeO on high-purity Fe was investigated under conditions of low oxygen potential. The phase transformation comprised three reactions, namely Fe3O4 precipitation, magnetite seam formation, and the eutectoid decomposition. The nucleation rate of Fe3O4 precipitation decreased with decreasing oxygen potential, whereas the incubation period for the eutectoid decomposition became longer. In contrast, magnetite seam formation was independent of the oxygen potential. The overall phase transformation was found to reach completion faster in an atmosphere with a lower oxygen potential. The effect of the oxygen potential on the phase transformation of FeO scale was rationalized by the different degree of supersaturation for Fe3O4 precipitation, which plays a crucial role in the eutectoid reaction.

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Author notes

  1. Suzue Yoneda

    Present address: Industrial Research Institute, Industrial Technology Research Department, Hokkaido Research Organization, N19, W11, Kitaku, Sapporo, 060-0819, Japan

Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W8, Kitaku, Sapporo, 060-8628, Japan

    Shigenari Hayashi & Suzue Yoneda

  2. Kimitsu R&D Lab, Technical Development Bureau, Nippon Steel Corporation, Futtsu, 299-1141, Japan

    Yasumitsu Kondo & Hiroshi Tanei

Authors
  1. Shigenari Hayashi
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  2. Suzue Yoneda
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  3. Yasumitsu Kondo
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  4. Hiroshi Tanei
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Correspondence to Shigenari Hayashi.

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Hayashi, S., Yoneda, S., Kondo, Y. et al. Phase Transformation of Thermally Grown FeO Formed on High-Purity Fe at Low Oxygen Potential. Oxid Met 94, 81–93 (2020). https://doi.org/10.1007/s11085-020-09979-2

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  • DOI: https://doi.org/10.1007/s11085-020-09979-2

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