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- Title
High-Temperature Oxidation Behavior of a Novel Co-Base Superalloy.
- Authors
Forsik, Stéphane A. J.; Polar Rosas, Alberto O.; Wang, Tao; Colombo, Gian A.; Zhou, Ning; Kernion, Samuel J.; Epler, Mario E.
- Abstract
A new polycrystalline γ′-strengthened cobalt-base superalloy with improved oxidation resistance up to 1100 °C is presented. Based on the Co-Al-W-Ni-Cr-Ti system, the chemistry was optimized via computational thermodynamics, and an 18 kg ingot was successfully melted under vacuum and processed. During cyclic oxidation trials at 800 °C, 1000 °C, and 1100 °C, the Co-base superalloy gained significantly less mass per surface area than the benchmark Waspaloy tested in similar conditions. X-ray diffraction and EDS analysis of the oxidized surface showed that a continuous layer of Al2O3 forms between the substrate and the external oxides, providing the necessary oxidation resistance.
- Subjects
COBALT; OXIDATION; POLYCRYSTALS; THERMODYNAMICS; HEAT resistant alloys; HIGH temperature chemistry
- Publication
Metallurgical & Materials Transactions. Part A, 2018, Vol 49, Issue 9, p4058
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-018-4736-7