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High-temperature oxidation behaviors of Fe-Cr-Al bulk and powder-sintered materials

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Abstract

In this study, cast bulk specimens and powder sintered specimens were produced from a Fe-22% Cr-5.8% Al alloy, which has been drawing industrial attention for its outstanding high-thermal and oxidation resistance as well as for its applicability as a filter and support material. The high-temperature oxidation behaviors of the specimens were compared and analyzed. Two types of specimens were subjected to 24-hour isothermal oxidation (temperatures of 900 °C, 1000 °C, and 1100 °C and a gas atmosphere of 79% N2+21% O2) to understand their high-temperature oxidation properties. The oxidized specimens were examined via X-ray, SEM, FE-SEM, and EPMA for microstructure and oxide analyses. The results of the oxidation tests showed that both bulk and powder-sintered specimens gained weight as temperature increased, with the powder sintered specimens gaining far more weight than the bulk specimens. As the temperature increased, the bulk specimens showed sequential formation of Al 2 O3, Cr2O3, and Fe3O4 oxide layers. The stable Al2O3 on the surface of the bulk specimens was found to play a role in arresting the rapid growth of oxide layers. In the powder-sintered specimens, however, the internal diffusion of O2 easily took place along the powder interfaces. As a result, far more oxidation occurred in the powder-sintered specimens than in the bulk specimens. Cracks and disintegration of the oxide layers were also found to have occurred as the temperature increased. The high-temperature oxidation mechanisms of bulk and powder-sintered materials in relation to temperature increase are further discussed.

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Authors and Affiliations

  1. School of Advanced Materials Engineering, Andong National University, Andong, 760-749, Korea

    Song-Yi Kim, Sung-Hwan Choi & Kee-Ahn Lee

  2. Department of Materials Engineering, Korea Institute of Machinery and Materials, 641-010, Changwon, Korea

    Jung-Yeul Yun

  3. School of Materials Science Engineering, University of Ulsan, Ulsan, 680-749, Korea

    Byoung-Kee Kim & Young-Min Kong

Authors
  1. Song-Yi Kim
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  2. Sung-Hwan Choi
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  3. Jung-Yeul Yun
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  4. Byoung-Kee Kim
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  5. Young-Min Kong
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  6. Kee-Ahn Lee
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Correspondence to Kee-Ahn Lee.

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Kim, SY., Choi, SH., Yun, JY. et al. High-temperature oxidation behaviors of Fe-Cr-Al bulk and powder-sintered materials. Met. Mater. Int. 17, 983–992 (2011). https://doi.org/10.1007/s12540-011-6017-5

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  • DOI: https://doi.org/10.1007/s12540-011-6017-5

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