High Temperature Oxidation Behavior of Ni-based High Entropy Superalloys
Journal Article
·
· Corrosion Science
- National Energy Technology Laboratory (NETL), Albany, OR (United States)
- National Energy Technology Laboratory (NETL), Albany, OR (United States); National Energy Technology Laboratory (NETL), Albany, OR (United States). NETL Support Contractor
A new class of polycrystalline gamma-prime strengthened superalloys with alloy compositions of (wt%) Ni-20Co-13Cr-6Fe-4Al-3W-2Mo-(4-x)Nb-(x)Ti (x = 0,1,2) were subjected to cyclic oxidation exposures in dry air at 800 °C for 3600 h. The alloys were borderline chromia/alumina formers, showing good oxidation resistance relative to commercially available materials of similar composition. While all alloys formed alumina scales initially, only the alloy with the lowest Ti/Nb ratio retained an alumina scale for the duration of the exposure. Formation of a continuous layer of rutile TiO2 at the alumina/alloy interface is proposed to cause eventual alumina failure for the alloys containing Ti.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 2279023
- Journal Information:
- Corrosion Science, Journal Name: Corrosion Science Journal Issue: N/A Vol. 226; ISSN 0010-938X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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