Cyclic oxidation behavior of selected commercial NiCr-alloys for engine exhaust valves in wet air environment between 800 and 950&nbsp;°C

Romedenne, Marie; Pillai, Rishi; Haynes, James A.

doi:10.1016/j.corsci.2022.110817

Cyclic oxidation behavior of selected commercial NiCr-alloys for engine exhaust valves in wet air environment between 800 and 950 °C

Journal Article · Sat Nov 12 00:00:00 EST 2022 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2022.110817· OSTI ID:1899835

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this work, the impact of water vapor on the cyclic oxidation behavior of four commercial Ni-based superalloys (N80A, N90, R41 and H282) was investigated between 800 and 950°C. Oxidation- and volatilization-induced Cr loss accelerated the transition from protective and adherent oxide formation (Cr₂O₃) to mixed oxides that significantly spalled at 950°C for H282 and R41. The accelerated oxidation, Cr depletion, and spallation susceptibility for R41 and to a lesser extent for H282 compared to N80A and N90 was related to the higher fraction of γ’, which led to increased Ti incorporation into the Cr₂O₃ scale in the presence of water vapor.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1899835

Alternate ID(s):: OSTI ID: 1961450

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Vol. 211; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Cyclic oxidation
Ni-based superalloys
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Cyclic oxidation behavior of selected commercial NiCr-alloys for engine exhaust valves in wet air environment between 800 and 950 °C

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