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Optimizing the Oxidation Properties of FeCrAl Alloys at Low Temperatures
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. Sandvik Heating Technology AB.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2017 (English)In: Oxidation of Metals, ISSN 0030-770X, E-ISSN 1573-4889, Vol. 88, no 3-4, 361-370 p.Article in journal (Refereed) Published
Abstract [en]

FeCrAl alloys are proposed candidate materials for liquid lead applications. Chromium is needed to assist the formation of a protective alumina layer, albeit has to be limited to avoid alpha' precipitation. Reactive elements (RE) improve oxidation properties, but little is known about the RE effects at lower temperatures. An alloy matrix based on Fe-10Cr-4Al (wt%), with varying Zr, Y and Ti contents, was exposed to liquid lead up to 1 year in the temperature interval of 450-550 A degrees C. It was found that the formation of protective alumina was dependent on the RE/carbon ratio. All alloys with ratios lower than unity showed poor oxidation properties due to the formation of Cr-carbides in the metal-oxide interface. A sufficiently high amount of Zr and Ti was shown to significantly improve the oxidation properties at both temperatures. The positive effect is related to the suppression of Cr-carbides by addition of stronger carbide formers.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2017. Vol. 88, no 3-4, 361-370 p.
Keyword [en]
FeCrAl, Reactive elements, Cr-carbides, Alumina
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-215358DOI: 10.1007/s11085-017-9718-4ISI: 000409975000013Scopus ID: 2-s2.0-85010826024OAI: oai:DiVA.org:kth-215358DiVA: diva2:1148206
Funder
EU, FP7, Seventh Framework Programme, 604862Swedish Research Council FormasVINNOVASwedish Energy Agency
Note

QC 20171010

Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2017-10-10Bibliographically approved

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