Microstructural stability of Fe-Cr-Al alloys at 450-550 degrees C
Artikel i vetenskaplig tidskrift, 2015

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.

Författare

J. Ejenstam

Kungliga Tekniska Högskolan (KTH)

Mattias Thuvander

Chalmers, Teknisk fysik, Materialens mikrostruktur

P. Olsson

Kungliga Tekniska Högskolan (KTH)

F. Rave

Sandvik Heating Technology

P. Szakalos

Kungliga Tekniska Högskolan (KTH)

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 457 291-297

Ämneskategorier

Annan teknik

DOI

10.1016/j.jnucmat.2014.11.101