Kyoko Kawagishi
;
Chihiro Tabata
;
Tadaharu Yokokawa
;
Yuji Takata
;
Michinari Yuyama
;
Takahide Horie
;
Hirotoshi Maezawa
;
Shinsuke Suzuki
;
Hiroshi Harada
Collection
Citation
Description:
(abstract)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.
Rights:
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
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