Microstructural stability of Fe–Cr–Al alloys at 450–550 °C

QC 20141217
Iron–Chromium–Aluminium (Fe–Cr–Al) alloys have been widely investigated as candidate materials for various nuclear applications. Albeit the excellent corrosion resistance, conventional Fe–Cr–Al alloys suffer from α–α′ phase separation and embrittlement when subjected to temperatures up to 500 °C, due to their high Cr-content. Low-Cr Fe–Cr–Al alloys are anticipated to be embrittlement resistant and provide adequate oxidation properties, yet long-term aging experiments and simulations are lacking in literature. In this study, Fe–10Cr–(4–8)Al alloys and a Fe–21Cr–5Al were thermally aged in the temperature interval of 450–550 °C for times up to 10,000 h, and the microstructures were evaluated mainly using atom probe tomography. In addition, a Kinetic Monte Carlo (KMC) model of the Fe–Cr–Al system was developed. No phase separation was observed in the Fe–10Cr–(4–8)Al alloys, and the developed KMC model yielded results in good agreement with the experimental data.

TEKNIK OCH TEKNOLOGIER Kemiteknik Korrosionsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Corrosion Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
Aluminum
Chromium
Corrosion resistance
Embrittlement
Iron alloys
Phase separation
Atom probe tomography
Candidate materials
Excellent corrosion resistances
Kinetic Monte Carlo modeling
Microstructural stability
Nuclear application
Oxidation properties
Temperature intervals

By the author/editor: Ejenstam, Jesper; Thuvander, Matti ...; Olsson, Pär; Rave, Fernando; Szakalos, Peter

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Corrosion Engine ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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