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

M. Romedenne; A. Haynes; R. Pillai

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

M. Romedenne, A. Haynes, R. Pillai

Corrosion Science & Technology

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

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.

Original language	English
Article number	110817
Journal	Corrosion Science
Volume	211
DOIs	https://doi.org/10.1016/j.corsci.2022.110817
State	Published - Feb 2023

Funding

G. Garner and J. Wade are thanked for their assistance with the experimental work. V. Cox and C. O’Dell are acknowledged for helping with metallographic preparations and T. Lowe, Y-F. Su and E. Cakmak for helping with microstructural characterizations. M. Ridley and D. Sulejmanovic are thanked for their valuable comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Vehicle Technologies, Powertrain Materials Core Program . Notice: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
U.S. Department of Energy
Vehicle Technologies Office

Keywords

Cyclic oxidation
Ni-based superalloys
Spallation behavior
Water vapor

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10.1016/j.corsci.2022.110817

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

abstract = "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{\textquoteright}, which led to increased Ti incorporation into the Cr2O3 scale in the presence of water vapor.",

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N2 - 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.

AB - 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.

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KW - Ni-based superalloys

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KW - Water vapor

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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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Keywords

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