The oxidation properties of fourth generation single-crystal nickel-based superalloys |
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| Authors: | Kyoko Kawagishi Hiroshi Harada Akihiro Sato Atsushi Sato Toshiharu Kobayashi |
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| Affiliation: | (1) the National Institute for Materials Science in Ibaraki, Tokyo, Japan;(2) Ishikawajima-Harima Heavy Industries Company in Tokyo, Tokyo, Japan;(3) Shibaura Institute of Technology in Tokyo, Tokyo, Japan |
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| Abstract: | The fourth-generation nickel-based single-crystal superalloys, which contain large amounts of refractory metals for strengthening and platinum group metals for topologically close-packed phase prevention, show excellent high-temperature strength. However, these alloying elements seem to decrease high-temperature oxidation resistance. In this study, nickel-based superalloys with various amounts of tantalum, rhenium, and ruthenium were examined in isothermal and cyclic exposures at 1,100°C to investigate the effect on the oxide growth rate and resistance to scale spallation. Ruthenium and rhenium were found to degrade the oxidation resistance by the vaporization of their oxide. Tantalum-rich oxide in the spinel layer acts to stabilize ruthenium and rhenium oxide in the scale. The addition of hafnium and yttrium is effective in improving the oxidation resistance of ruthenium-containing nickel-based superalloys. |
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