Oxidation Lifetime Modeling of 625 and 120 Foils After Long-term Exposure in Flowing Air + 10% H 2O at 700 and 800 ∘ C

M. Romedenne; R. Pillai; S. Dryepondt; B. Pint

doi:10.1007/s11085-022-10124-4

Oxidation Lifetime Modeling of 625 and 120 Foils After Long-term Exposure in Flowing Air + 10% H ₂O at 700 and 800 ^∘ C

M. Romedenne, R. Pillai, S. Dryepondt, B. Pint

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

2 Scopus citations

Abstract

A model describing oxidation kinetics considering simultaneous oxidation and volatilization of external oxide scales was integrated with a CALPHAD-based coupled thermodynamic and kinetic approach to predict the oxidation-induced lifetime of foils of alloys 625 and 120. Long-term exposures in flowing air +10% H ₂O at 700 and 800 ^∘C under two flow velocities were used to validate the modeling results. The time to a critical Cr concentration of 10 wt% at the oxide/alloy interface, t₁₀, was shown to correlate with the breakdown of the Cr ₂O ₃ scale for the studied experimental conditions. Finally, the modeling approach was extended to consider time-dependent oxidation and volatilization rate constants to develop a more appropriate lifetime criterion for microturbine recuperator foils.

Original language	English
Pages (from-to)	305-324
Number of pages	20
Journal	Oxidation of Metals
Volume	98
Issue number	3-4
DOIs	https://doi.org/10.1007/s11085-022-10124-4
State	Published - Oct 2022

Funding

The author would like to thank G. W. Garner, M. S. Stephens, J. Wade, T. Lowe, V. Cox at ORNL for their assistance with the experimental work and P. F. Tortorelli and A. Haynes for their valuable comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Combined Heat and Power Program. The author would like to thank G. W. Garner, M. S. Stephens, J. Wade, T. Lowe, V. Cox at ORNL for their assistance with the experimental work and P. F. Tortorelli and A. Haynes for their valuable comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Combined Heat and Power Program.

Keywords

Foil oxidation
Lifetime
Modeling
Recuperated-microturbine
Water vapor

Access to Document

10.1007/s11085-022-10124-4

Cite this

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title = "Oxidation Lifetime Modeling of 625 and 120 Foils After Long-term Exposure in Flowing Air + 10% H 2O at 700 and 800 ∘ C",

abstract = "A model describing oxidation kinetics considering simultaneous oxidation and volatilization of external oxide scales was integrated with a CALPHAD-based coupled thermodynamic and kinetic approach to predict the oxidation-induced lifetime of foils of alloys 625 and 120. Long-term exposures in flowing air +10% H 2O at 700 and 800 ∘C under two flow velocities were used to validate the modeling results. The time to a critical Cr concentration of 10 wt% at the oxide/alloy interface, t10, was shown to correlate with the breakdown of the Cr 2O 3 scale for the studied experimental conditions. Finally, the modeling approach was extended to consider time-dependent oxidation and volatilization rate constants to develop a more appropriate lifetime criterion for microturbine recuperator foils.",

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author = "M. Romedenne and R. Pillai and S. Dryepondt and B. Pint",

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T1 - Oxidation Lifetime Modeling of 625 and 120 Foils After Long-term Exposure in Flowing Air + 10% H 2O at 700 and 800 ∘ C

AU - Romedenne, M.

AU - Pillai, R.

AU - Dryepondt, S.

AU - Pint, B.

PY - 2022/10

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N2 - A model describing oxidation kinetics considering simultaneous oxidation and volatilization of external oxide scales was integrated with a CALPHAD-based coupled thermodynamic and kinetic approach to predict the oxidation-induced lifetime of foils of alloys 625 and 120. Long-term exposures in flowing air +10% H 2O at 700 and 800 ∘C under two flow velocities were used to validate the modeling results. The time to a critical Cr concentration of 10 wt% at the oxide/alloy interface, t10, was shown to correlate with the breakdown of the Cr 2O 3 scale for the studied experimental conditions. Finally, the modeling approach was extended to consider time-dependent oxidation and volatilization rate constants to develop a more appropriate lifetime criterion for microturbine recuperator foils.

AB - A model describing oxidation kinetics considering simultaneous oxidation and volatilization of external oxide scales was integrated with a CALPHAD-based coupled thermodynamic and kinetic approach to predict the oxidation-induced lifetime of foils of alloys 625 and 120. Long-term exposures in flowing air +10% H 2O at 700 and 800 ∘C under two flow velocities were used to validate the modeling results. The time to a critical Cr concentration of 10 wt% at the oxide/alloy interface, t10, was shown to correlate with the breakdown of the Cr 2O 3 scale for the studied experimental conditions. Finally, the modeling approach was extended to consider time-dependent oxidation and volatilization rate constants to develop a more appropriate lifetime criterion for microturbine recuperator foils.

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