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Effect of Ca Addition on the Oxidation Resistance of Ni–Al Alloy

  • Topical Collection: Processing and Applications of Superalloys
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Abstract

Ni-base superalloys are known for their high temperature oxidation resistance, however, impurity of S at ppm order can significantly decrease the oxidation resistance of the alloy. Melting using a CaO crucible is reported to improve the oxidation resistance, but Ca can negatively impact the oxidation resistance of the alloys, depending on the amount and method of addition. The objectives of this research were to determine the effect of Ca addition using Al–Ca alloy, and to understand how Ca affects the oxidation resistance of the alloy. Single crystal Ni–9.8 wt pct Al model alloys melted in an Al2O3 crucible were cast, with the addition of 20 ppm of S in all samples, and 0, 20, and 100 ppm of Ca using Al–4.9 wt pct Ca alloy. Ca addition improves the oxidation resistance of the samples, though it lacked in efficiency in the improvement of this trait compared to when using a CaO crucible. Increasing the amount of Ca addition led to the increase in the amount of CaS formation and desulfurization, though the removal of slag is crucial. Although Ca was effective in terms of desulfurization, to limit the negative effects of Ca itself, the formation of sulfides must be the dominating reaction.

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Acknowledgments

This research was financially supported by the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Program (SIP), “Materials Integration for revolutionary design system of structural materials” (Funding agency: JST). The authors would like to express our gratitude to Dr. Makoto Osawa for the helpful discussions. We also would like to thank Ms. Kyoko Suzuki for the support of microstructural investigation, and Mr. Yuji Takata for the preparation of the single crystal alloys.

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Author notes

  1. Hiroshi Harada

    Present address: Superalloy Design Laboratory, 3-18-33, Azuma, Tsukuba, Ibaraki, 305-0031, Japan

Authors and Affiliations

  1. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    Chihiro Tabata, Kyoko Kawagishi, Tadaharu Yokokawa, Jun Uzuhashi, Tadakatsu Ohkubo & Hiroshi Harada

  2. Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan

    Chihiro Tabata & Shinsuke Suzuki

  3. Department of Materials Science, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan

    Chihiro Tabata, Kyoko Kawagishi & Shinsuke Suzuki

  4. Kagami Memorial Institute for Materials Science and Technology, Waseda University, 2-8-26, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan

    Shinsuke Suzuki

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  1. Chihiro Tabata
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Tabata, C., Kawagishi, K., Yokokawa, T. et al. Effect of Ca Addition on the Oxidation Resistance of Ni–Al Alloy. Metall Mater Trans A 54, 1937–1945 (2023). https://doi.org/10.1007/s11661-022-06936-3

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  • DOI: https://doi.org/10.1007/s11661-022-06936-3

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