TY - JOUR
T1 - Oxidation Resistance Improvement of Ni-Base Single-Crystal Superalloy Melted in a CaO Crucible
AU - Sugiyama, Takuya
AU - Utada, Satoshi
AU - Yokokawa, Tadaharu
AU - Osawa, Makoto
AU - Kawagishi, Kyoko
AU - Suzuki, Shinsuke
AU - Harada, Hiroshi
N1 - Funding Information:
The authors would like to show our gratitude to Dr. T. Kobayashi, Superalloys and High Temperature Materials Group at NIMS, for sample preparation and his insightful advice on our work. We are grateful to Dr. M. Yuyama, Superalloys and High Temperature Materials Group at NIMS, for technical assistance with the creep test. We also thank Drs. S. Kawada, S. Ito, A. Ishitoya, and A. Iwanade, Materials Analysis Station at NIMS, for the chemical analysis. Dr. J. Cormier, the Institut Pprime, is acknowledged for his advice on the preprint of our manuscript. This research was financially supported by the Japan Science and Technology Agency (JST), under the Advanced Low Carbon Technology Research and Development Program (ALCA) “Development of direct and complete recycling method for superalloy turbine aerofoils (JPMJAL1302).” 1 CMSX-4 is a trademark of Cannon-Muskegon Co., MI 2 JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
Funding Information:
The authors would like to show our gratitude to Dr. T. Kobayashi, Superalloys and High Temperature Materials Group at NIMS, for sample preparation and his insightful advice on our work. We are grateful to Dr. M. Yuyama, Superalloys and High Temperature Materials Group at NIMS, for technical assistance with the creep test. We also thank Drs. S. Kawada, S. Ito, A. Ishitoya, and A. Iwanade, Materials Analysis Station at NIMS, for the chemical analysis. Dr. J. Cormier, the Institut Pprime, is acknowledged for his advice on the preprint of our manuscript. This research was financially supported by the Japan Science and Technology Agency (JST), under the Advanced Low Carbon Technology Research and Development Program (ALCA) ?Development of direct and complete recycling method for superalloy turbine aerofoils (JPMJAL1302).?
Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society and ASM International.
PY - 2019/8/15
Y1 - 2019/8/15
N2 - 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.
AB - 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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U2 - 10.1007/s11661-019-05297-8
DO - 10.1007/s11661-019-05297-8
M3 - Article
AN - SCOPUS:85067072250
SN - 1073-5623
VL - 50
SP - 3903
EP - 3911
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 8
ER -