Cyclic Oxidation of Two FeCrAlRE Foils at 1100 °C - The Influence of the Concentration of Minor Alloying Elements on Scale Microstructure

Fang Liu; Helena Götlind; Sead Canovic; Hai Ping Lai; Jörgen Westlinder; Andreas Rosberg; Jan Erik Svensson; Lars Gunnar Johansson; Mats Halvarsson

doi:10.4028/www.scientific.net/MSF.595-598.707

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HomeMaterials Science ForumMaterials Science Forum Vols. 595-598Cyclic Oxidation of Two FeCrAlRE Foils at 1100 °C...

Cyclic Oxidation of Two FeCrAlRE Foils at 1100 °C - The Influence of the Concentration of Minor Alloying Elements on Scale Microstructure

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.