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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 8/2019

03-06-2019

Oxidation Resistance Improvement of Ni-Base Single-Crystal Superalloy Melted in a CaO Crucible

Authors: Takuya Sugiyama, Satoshi Utada, Tadaharu Yokokawa, Makoto Osawa, Kyoko Kawagishi, Shinsuke Suzuki, Hiroshi Harada

Published in: Metallurgical and Materials Transactions A | Issue 8/2019

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Abstract

An advanced Ni-base single-crystal superalloy, TMS-238, has the highest temperature capability, but there is still potential to improve its high-temperature properties. In the present study, aiming for that further improvement, TMS-238 was melted in a CaO crucible, which replaced an Al2O3 crucible. Creep tests at 1100 °C/137 MPa and cyclic oxidation tests at 1100 °C were conducted to compare the high-temperature properties of TMS-238 melted in an Al2O3vs a CaO crucible. Regardless of the melting crucible, the creep properties of the samples were equivalent. Meanwhile, TMS-238 melted in a CaO crucible exhibited better oxidation resistance. Although the composition of the oxide scale was almost the same, the sample melted in an Al2O3 crucible had its oxide scale spalled, while a continuous oxide scale was formed on the sample melted in a CaO crucible. Dissolved Ca capturing S as CaS and preventing segregation of S at the metal-oxide interface is a possible reason for the improvement of the oxide scale adhesiveness. The results indicated that melting in a CaO crucible can improve the oxidation resistance of the original superalloys while maintaining their creep properties.
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Footnotes
1
CMSX-4 is a trademark of Cannon-Muskegon Co., MI
 
2
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
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Metadata
Title
Oxidation Resistance Improvement of Ni-Base Single-Crystal Superalloy Melted in a CaO Crucible
Authors
Takuya Sugiyama
Satoshi Utada
Tadaharu Yokokawa
Makoto Osawa
Kyoko Kawagishi
Shinsuke Suzuki
Hiroshi Harada
Publication date
03-06-2019
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 8/2019
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-019-05297-8

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