Article Improvement of Oxidation Resistance for Ni-Base Single Crystal Superalloy TMS-238 by Suppression of Sb Segregation at Oxide/Substrate Interface Using CaO

Hirotoshi Maezawa ; Chihiro Tabata SAMURAI ORCID (National Institute for Materials Science) ; Yuji Takata SAMURAI ORCID (National Institute for Materials Science) ; Jun Uzuhashi SAMURAI ORCID (National Institute for Materials Science) ; Tadakatsu Ohkubo SAMURAI ORCID (National Institute for Materials Science) ; Tadaharu Yokokawa SAMURAI ORCID (National Institute for Materials Science) ; Hiroshi Harada (National Institute for Materials Science) ; Kyoko Kawagishi SAMURAI ORCID (National Institute for Materials Science) ; Shinsuke Suzuki

Improvement of Oxidation Resistance for Ni-Base Single Crystal Superalloy TMS-238 by Suppression of Sb Segregation at Oxide-Substrate Interface Using CaO.pdf
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Hirotoshi Maezawa, Chihiro Tabata, Yuji Takata, Jun Uzuhashi, Tadakatsu Ohkubo, Tadaharu Yokokawa, Hiroshi Harada, Kyoko Kawagishi, Shinsuke Suzuki. Improvement of Oxidation Resistance for Ni-Base Single Crystal Superalloy TMS-238 by Suppression of Sb Segregation at Oxide/Substrate Interface Using CaO. Metallurgical and Materials Transactions B. 2023, 55 (), 183-194. https://doi.org/10.48505/nims.4596
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(abstract)

Impurity Sb degrades the oxidation resistance of Ni-base superalloys after Al2O3 crucible melting. The purpose of this study is to clarify the effect of CaO on the oxidation resistance of Ni-base SC superalloys TMS-238 containing Sb and the mechanism. Single crystal alloys containing Sb were cast using an Al2O3 crucible and a CaO crucible. In the cyclic oxidation tests, the mass did not decrease for the alloy after CaO crucible melting. In STEM observations for the alloy after CaO crucible melting, Sb-Ca-O inclusion was found. In 3DAP for the oxide/substrate interface of the alloy after CaO crucible melting, Sb segregation was not detected. Moreover, the CaO rod was inserted in the TMS-238 melt to observe the CaO/melt interface. In EPMA observations of the surface of the CaO rod, Sb was observed. Therefore, the higher oxidation resistance of the alloy after CaO crucible melting than that of Al2O3 crucible melting is due to the suppression of Sb segregation at the oxide/substrate interface by removing Sb from the melt and fixing Sb in the alloy. These occurs by the formation of Sb-Ca-O on the surface of CaO, and the formation of Sb-Ca-O inclusions in the alloy, respectively.

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  • In Copyright
    This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s11663-023-02948-5

Keyword: Ni-base superalloy

Date published: 2023-11-07

Publisher: Springer Science and Business Media LLC

Journal:

  • Metallurgical and Materials Transactions B (ISSN: 15431916) vol. 55 p. 183-194

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4596

First published URL: https://doi.org/10.1007/s11663-023-02948-5

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Updated at: 2024-11-07 16:30:28 +0900

Published on MDR: 2024-11-07 16:30:28 +0900

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