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Microstructural investigation of the initial oxidation of the FeCrAlRE alloy Kanthal AF in dry and wet O2 at 600 and 800°C
Dalarna University, School of Technology and Business Studies, Material Science.
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2010 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 157, no 6, p. C223-C230Article in journal (Refereed) Published
Abstract [en]

The FeCrAlRE (where RE is reactive element) alloy Kanthal AF was exposed isothermally at 600 and 800°C for 72 h in dry O2 and in O2 with 10 vol % H2O. The mass gains were 3–5 times higher at the higher temperature. The presence of water vapor increased the oxidation rate at 800°C, while no significant effect was observed at 600°C. A thin two-layered oxide formed at 600°C: an outer (Fe,Cr)2O3 corundum-type oxide, containing some Al, and an inner, probably amorphous, Al-rich oxide. At 800°C a two-layered oxide formed in both environments. The inner layer consisted of inward grown a-Al2O3. In dry O2 the originally formed outward grown g-Al2O3 had transformed to a-Al2O3 after 72 h. Water vapor stabilized the outward grown g-Al2O3 and hence no transformation occurred after 72 h in humid environment. RE-rich oxide particles with varying composition (Y, Zr, and Ti) were distributed in the base oxide at both temperatures and in both environments. The RE-rich particles were separated from the alloy substrate by a layer of Al-rich oxide. At 800°C the Y-rich RE particles were surrounded by thick oxide patches in both dry and humid O2.

Place, publisher, year, edition, pages
The electrochemical society , 2010. Vol. 157, no 6, p. C223-C230
Keywords [sv]
FeCrAl-legering, högtemperaturoxidation, transmissionselektronmikroskopi
National Category
Manufacturing, Surface and Joining Technology
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-4669DOI: 10.1149/1.3391447ISI: 000277260200050OAI: oai:dalea.du.se:4669DiVA, id: diva2:520189
Available from: 2010-04-28 Created: 2010-04-28 Last updated: 2017-12-07Bibliographically approved

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CiteExportLink to record
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Citation style
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