Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation
Abstract
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.
- Authors:
-
[1];
[1];
[2];
- National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Publication Date:
- Research Org.:
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1413213
- Report Number(s):
- NETL-PUB-21369
Journal ID: ISSN 0030-770X; PII: 9821; TRN: US1800420
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Oxidation of Metals
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 1-2; Journal ID: ISSN 0030-770X
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 20 FOSSIL-FUELED POWER PLANTS; 36 MATERIALS SCIENCE; Nickel alloy; Transient oxidation; Chromia former; Void formation; Recrystallization
Citation Formats
Oleksak, Richard P., Carney, Casey S., Holcomb, Gordon R., and Dogan, Omer N. Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation. United States: N. p., 2017.
Web. doi:10.1007/s11085-017-9821-6.
Oleksak, Richard P., Carney, Casey S., Holcomb, Gordon R., & Dogan, Omer N. Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation. United States. https://doi.org/10.1007/s11085-017-9821-6
Oleksak, Richard P., Carney, Casey S., Holcomb, Gordon R., and Dogan, Omer N. Mon .
"Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation". United States. https://doi.org/10.1007/s11085-017-9821-6. https://www.osti.gov/servlets/purl/1413213.
@article{osti_1413213,
title = {Structural Evolution of a Ni Alloy Surface During High-Temperature Oxidation},
author = {Oleksak, Richard P. and Carney, Casey S. and Holcomb, Gordon R. and Dogan, Omer N.},
abstractNote = {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.},
doi = {10.1007/s11085-017-9821-6},
journal = {Oxidation of Metals},
number = 1-2,
volume = 90,
place = {United States},
year = {Mon Nov 20 00:00:00 EST 2017},
month = {Mon Nov 20 00:00:00 EST 2017}
}
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Works referencing / citing this record:
Microstructure of Bare and Sol–Gel Alumina-Coated Nickel-Base Alloy Inconel 625 After Long-Term Oxidation at 900 °C
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