Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation

Oleksak, Richard P.; Carney, Casey S.; Holcomb, Gordon R.; Dogan, Omer N.

doi:10.1007/s11085-017-9821-6

Title: Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation

Journal Article · Mon Nov 20 00:00:00 EST 2017 · Oxidation of Metals

DOI:https://doi.org/10.1007/s11085-017-9821-6· OSTI ID:1413213

^[1];

^[2]; Dogan, Omer N. ^[2]

National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)

We show that considerable structural transformations occur at a Ni alloy surface during the transient stages of high-temperature oxidation. This was demonstrated by exposing the alloy to high-temperature CO₂ for short times at both atmospheric and supercritical pressures. A protective Cr-rich oxide layer formed after only 5 min at 700 °C and persisted for longer exposures up to 500 h. Voids formed and grew over time by the condensation of metal vacancies generated during oxidation, while the alloy surface recrystallized after sufficient oxidation had occurred. The oxygen potential established at the oxide/alloy interface led to oxidation along the newly formed grain boundaries as well as adjacent to and inside of the voids. Al, the most stable oxide-former and present at low concentration in the alloy, was preferentially oxidized in these regions. Furthermore, the results provide an improved understanding of the internal oxidation of Al and its role in enhancing scale adhesion for this class of Ni alloys.

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Research Organization:: National Energy Technology Lab. (NETL), Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

OSTI ID:: 1413213

Report Number(s):: NETL-PUB-21369; PII: 9821; TRN: US1800420

Journal Information:: Oxidation of Metals, Vol. 90, Issue 1-2; ISSN 0030-770X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 28 works

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Effect of Surface Finish on High-Temperature Oxidation of Steels in CO2, Supercritical CO2, and Air Oleksak, Richard P.; Holcomb, Gordon R.; Carney, Casey S. Oxidation of Metals, Vol. 92, Issue 5-6 https://doi.org/10.1007/s11085-019-09938-6	journal	October 2019
High-Temperature Oxidation of Commercial Alloys in Supercritical CO2 and Related Power Cycle Environments Oleksak, Richard P.; Tylczak, Joseph H.; Carney, Casey S. JOM, Vol. 70, Issue 8 https://doi.org/10.1007/s11837-018-2952-7	journal	June 2018
The role of metal vacancies during high-temperature oxidation of alloys Oleksak, Richard P.; Kapoor, Monica; Perea, Daniel. E. npj Materials Degradation, Vol. 2, Issue 1 https://doi.org/10.1038/s41529-018-0046-1	journal	September 2018

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