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High Temperature Oxidation of Hot-Dip Aluminized T92 Steels

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Abstract

The T92 steel plate was hot-dip aluminized, and oxidized in order to characterize the high-temperature oxidation behavior of hot-dip aluminized T92 steel. The coating consisted of Al-rich topcoat with scattered Al3Fe grains, Al3Fe-rich upper alloy layer with scattered (Al, Al5Fe2, AlFe)-grains, and Al5Fe2–rich lower alloy layer with scattered (Al5Fe2, AlFe)-grains. Oxidation at 800 °C for 20 h formed (α-Al2O3 scale)/(AlFe layer)/(AlFe3 layer)/(α-Fe(Al) layer), while oxidation at 900 °C for 20 h formed (α-Al2O3 scale plus some Fe2O3)/(AlFe layer)/(AlFe3 layer)/(α-Fe(Al) layer) from the surface. During oxidation, outward migration of all substrate elements, inward diffusion of oxygen, and back and forth diffusion of Al occurred according to concentration gradients. Also, diffusion transformed and broadened AlFe and AlFe3 layers dissolved with some oxygen and substrate alloying elements. Hot-dip aluminizing improved the high-temperature oxidation resistance of T92 steel through preferential oxidation of Al at the surface.

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Acknowledgements

This work was supported by the project “Development of the High-Efficiency Low-Emission Future Energy Production Technology (EO15580)” of National Research Council of Science and Technology (NST) grant by the Korea government (MSIP) (No. CRC-15-07-KIER).

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Authors and Affiliations

  1. Department of Mechanical Engineering, MUET, SZAB Campus, Khairpur Mir’s, 66020, Pakistan

    Muhammad Ali Abro

  2. Center for Energy Materials Metrology, Korea Research Institute of Standards and Science, Daejon, 34113, Republic of Korea

    Junhee Hahn

  3. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea

    Dong Bok Lee

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  1. Muhammad Ali Abro
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  2. Junhee Hahn
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  3. Dong Bok Lee
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Correspondence to Dong Bok Lee.

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Abro, M.A., Hahn, J. & Lee, D.B. High Temperature Oxidation of Hot-Dip Aluminized T92 Steels. Met. Mater. Int. 24, 507–515 (2018). https://doi.org/10.1007/s12540-018-0064-0

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  • DOI: https://doi.org/10.1007/s12540-018-0064-0

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