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Microstructural stability of Fe-Cr-Al alloys at 450-550 degrees C

J. Ejenstam ; Mattias Thuvander (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; P. Olsson ; F. Rave ; P. Szakalos
Journal of Nuclear Materials (0022-3115). Vol. 457 (2015), p. 291-297.
[Artikel, refereegranskad vetenskaplig]

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 alpha-alpha' phase separation and embrittlement when subjected to temperatures up to 500 degrees 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 degrees 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.



Denna post skapades 2015-03-11. Senast ändrad 2015-05-02.
CPL Pubid: 213657

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur