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In determining the specifications for the production or recycling process of Ni-base single crystal superalloys, it is important to clarify the allowable trace impurity concentration. In this study, the effects of Pb and Sb on high-temperature strength and oxidation resistance of 6th generation superalloy TMS-238 were summarized. It was found that both Sb and Pb do not have a large effect on creep rupture life, but they degrade oxidation resistance. The removal of impurities by melting in a CaO crucible was tested and its mechanism was examined. It was found that Ca forms a compound with impurities within the alloy and prevents the segregation of impurities at the oxide film/substrate interface. The effect of CaO was also confirmed in an experiment in which impurity S was removed from 1st generation Ni-base superalloy TMS-1700 by adding CaO particles in a 3-ton commercial melting furnace. Similar results were obtained for this alloy, where it was also found that CaS had formed inside the alloy, thus improving the oxidation resistance of TMS-1700.

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• In Copyright
  

Keyword: Creep, Single crystal, Impurity, Oxidation, CaO

Date published: 2024-08-21

Publisher: Springer Nature Switzerland

Journal:

• The Minerals, Metals & Materials Series (ISSN: 23671181) p. 555-560

Funding:

• JST the Advanced Low Carbon Technology Research and Development Program (ALCA)　JPNJAL1302
• NEDO JPNP21007

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4871

First published URL: https://doi.org/10.1007/978-3-031-63937-1_52

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Updated at: 2025-08-21 08:30:15 +0900

Published on MDR: 2025-08-21 08:19:08 +0900