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説明:

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.

権利情報:

• 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

キーワード: Ni-base superalloy

刊行年月日: 2023-11-07

出版者: Springer Science and Business Media LLC

掲載誌:

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

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

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

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

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更新時刻: 2024-11-07 16:30:28 +0900

MDRでの公開時刻: 2024-11-07 16:30:28 +0900