Papers by Keyword: FeCrAl

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Authors: Anne Marie Huntz, S.C. Tsaï, J. Balmain, K. Messaoudi, Bernard Lesage, C. Dolin
Authors: Fang Liu, Helena Götlind, Sead Canovic, Hai Ping Lai, Jörgen Westlinder, Andreas Rosberg, Jan Erik Svensson, Lars Gunnar Johansson, Mats Halvarsson
Abstract: Two FeCrAlRE alloys, a commercial, 0C404, and a model alloy in the form of thin foils, with different Mn, Nb, Mo and Ti concentrations were subjected to cyclic oxidation in lab air at 1100°C. The oxidized samples were studied by gravimetry, Grazing-Incidence X-ray Diffraction (GI-XRD), Scanning Transmission Electron Microscopy (STEM), and Energy Dispersive X-ray (EDX) analysis. The two FeCrAl alloys exhibit different oxidation kinetics; however, both alloys have the same weight gain after 500 hours exposure. During the early stages the scale consists mainly of α-Al2O3 together with some oxide particles containing Mn, Al, Fe and Cr formed on the alloys. After 500 hours the 0C404 scale locally also consists of larger polycrystalline regions of Mn-Cr-Al spinel. In addition, Si-rich oxide, chromia and Al-Cr oxide could be observed at the metal/oxide interface.
Authors: Z.G. Zhang, Yan Niu
Abstract: The effect of the addition of 5 and 10 at.% Cr on the oxidation of a binary Fe-10 at.% Al alloy (Fe-10Al) was studied in 1 atm O2 at 1000°C. Fe-10Al underwent a very slow initial nearly-parabolic stage followed by a breakaway composed of two subsequent parabolic stages with a smaller rate constant for the final period. The two ternary alloys (Fe-5Cr-10Al and Fe-10Cr-10Al) presented two parabolic stages with final rate constants similar to each other and much lower than that for Fe-10Al. The alumina scale developed initially on Fe-10Al was replaced later by a layered scale containing mixtures of Fe and Al oxides plus many Fe-rich oxide nodules. Fe-5Cr-10Al was mostly covered by a thin alumina layer just above the alloy surface with some Fe-rich nodules formed in the beginning of oxidation, which later on were healed by alumina with a large decrease of the oxidation rate. A continuous alumina layer formed on the whole sample surface without any Fe-rich nodule for Fe-10Cr-10Al. Therefore, the addition of chromium is obviously beneficial for the oxidation resistance of Fe-10Al by inhibiting the formation of fast-growing Fe-containing oxides and promoting the development of an exclusive alumina layer. However, the effect of chromium is different from the classical third-element effect.
Authors: G. Galliot, C. Olagnon, Gilbert Fantozzi, I. Alliat
Authors: Eric Andrieu, A. Germidis, Régine Molins
Authors: Bo Jönsson, Roger Berglund, Jonas Magnusson, Peter Henning, Mats Hättestrand
Authors: Martah Homa, Zbigniew Żurek, A. Stawiarski, J. Zurek, A. Gil, A. Rakowska
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