Chromium-Dependent Effect on Oxidation Behavior of Ni-Fe-Based Superalloy for Ultra-Supercritical Steam Turbine Applications: Influence of Temperature and Pure Steam

Yaxin Xu; Jintao Lu; Wenya Li; Zhen Yang; Yuefeng Gu

doi:10.5006/3534

Chromium-Dependent Effect on Oxidation Behavior of Ni-Fe-Based Superalloy for Ultra-Supercritical Steam Turbine Applications: Influence of Temperature and Pure Steam

Yaxin Xu, Jintao Lu, Wenya Li, Zhen Yang, Yuefeng Gu

School of Materials Sience and Engineering

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

4 Scopus citations

Abstract

Three Ni-Fe-based superalloys with 16 wt% to 18 wt% Cr were designed for steam turbine components in advanced ultra-supercritical power plants. The oxidation behavior of these alloys was evaluated at 750°C to 850°C for 1,000 h to explore the chromium-dependent effect on the oxidation behavior in static air and pure steam. The results reveal that the oxidation rate of the alloys decreased as the Cr content increased in both the air and steam environment. However, such a beneficial effect of Cr was found to be temperature-dependent, which became less significant when the exposure temperature increased from 750°C to 850°C, leading to the formation of an additional NiFe₂O₄ layer and severe internal Al₂O₃/TiO₂ oxide. The impact of temperature and pure steam on the oxidation resistance of the alloys were discussed based on the calculation of critical Cr concentration.

Original language	English
Pages (from-to)	941-953
Number of pages	13
Journal	Corrosion
Volume	76
Issue number	10
DOIs	https://doi.org/10.5006/3534
State	Published - Oct 2020

Keywords

nickel alloys
oxidation
steam environment
superalloys

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10.5006/3534

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title = "Chromium-Dependent Effect on Oxidation Behavior of Ni-Fe-Based Superalloy for Ultra-Supercritical Steam Turbine Applications: Influence of Temperature and Pure Steam",

abstract = "Three Ni-Fe-based superalloys with 16 wt% to 18 wt% Cr were designed for steam turbine components in advanced ultra-supercritical power plants. The oxidation behavior of these alloys was evaluated at 750°C to 850°C for 1,000 h to explore the chromium-dependent effect on the oxidation behavior in static air and pure steam. The results reveal that the oxidation rate of the alloys decreased as the Cr content increased in both the air and steam environment. However, such a beneficial effect of Cr was found to be temperature-dependent, which became less significant when the exposure temperature increased from 750°C to 850°C, leading to the formation of an additional NiFe2O4 layer and severe internal Al2O3/TiO2 oxide. The impact of temperature and pure steam on the oxidation resistance of the alloys were discussed based on the calculation of critical Cr concentration.",

keywords = "nickel alloys, oxidation, steam environment, superalloys",

author = "Yaxin Xu and Jintao Lu and Wenya Li and Zhen Yang and Yuefeng Gu",

note = "Publisher Copyright: {\textcopyright} 2020 NACE International.",

year = "2020",

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doi = "10.5006/3534",

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volume = "76",

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T1 - Chromium-Dependent Effect on Oxidation Behavior of Ni-Fe-Based Superalloy for Ultra-Supercritical Steam Turbine Applications

T2 - Influence of Temperature and Pure Steam

AU - Xu, Yaxin

AU - Lu, Jintao

AU - Li, Wenya

AU - Yang, Zhen

AU - Gu, Yuefeng

PY - 2020/10

Y1 - 2020/10

N2 - Three Ni-Fe-based superalloys with 16 wt% to 18 wt% Cr were designed for steam turbine components in advanced ultra-supercritical power plants. The oxidation behavior of these alloys was evaluated at 750°C to 850°C for 1,000 h to explore the chromium-dependent effect on the oxidation behavior in static air and pure steam. The results reveal that the oxidation rate of the alloys decreased as the Cr content increased in both the air and steam environment. However, such a beneficial effect of Cr was found to be temperature-dependent, which became less significant when the exposure temperature increased from 750°C to 850°C, leading to the formation of an additional NiFe2O4 layer and severe internal Al2O3/TiO2 oxide. The impact of temperature and pure steam on the oxidation resistance of the alloys were discussed based on the calculation of critical Cr concentration.

AB - Three Ni-Fe-based superalloys with 16 wt% to 18 wt% Cr were designed for steam turbine components in advanced ultra-supercritical power plants. The oxidation behavior of these alloys was evaluated at 750°C to 850°C for 1,000 h to explore the chromium-dependent effect on the oxidation behavior in static air and pure steam. The results reveal that the oxidation rate of the alloys decreased as the Cr content increased in both the air and steam environment. However, such a beneficial effect of Cr was found to be temperature-dependent, which became less significant when the exposure temperature increased from 750°C to 850°C, leading to the formation of an additional NiFe2O4 layer and severe internal Al2O3/TiO2 oxide. The impact of temperature and pure steam on the oxidation resistance of the alloys were discussed based on the calculation of critical Cr concentration.

KW - nickel alloys

KW - oxidation

KW - steam environment

KW - superalloys

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Chromium-Dependent Effect on Oxidation Behavior of Ni-Fe-Based Superalloy for Ultra-Supercritical Steam Turbine Applications: Influence of Temperature and Pure Steam

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Keywords

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