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The Effect of Microstructure on Steam Oxidation Behavior of the Fe–20Cr–35Ni–2.5Nb (at.%) Steel at 1073 K

Abstract

This paper focuses on the effect of microstructure change due to the addition of alloying elements (W or Ti) on steam oxidation behavior of the Fe–20Cr–35Ni–2.5Nb (at.%) steel at 1073 K. Steam oxidation behavior of the steels strongly depended on the formation of continuous Cr2O3 layer. Microstructure of the steels was changed by the addition of alloying elements. A high density of fine precipitates in the steels gave a better steam oxidation resistance. Heterogeneous interface between IMCs and the matrix may play important role of nucleation and diffusion in the matrix, resulting in the rapid formation of the continuous Cr2O3 layer.

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Acknowledgements

This study is financially supported in part by the project of “Elemental Technology for Design and Manufacturing of Innovative 1073 K Class Super Austenitic Heat-Resistant Steels” in Advanced Low Carbon Technology Research and Development Program, Japan Science and Technology Agency.

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Correspondence to Mitsutoshi Ueda.

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Ueda, M., Ohbayashi, J., Yao, T. et al. The Effect of Microstructure on Steam Oxidation Behavior of the Fe–20Cr–35Ni–2.5Nb (at.%) Steel at 1073 K. Oxid Met 96, 81–91 (2021). https://doi.org/10.1007/s11085-021-10050-x

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Keywords

  • Novel austenitic steels
  • Steam oxidation
  • Microstructure
  • Precipitation of intermetallics