Oxidation Behavior of As-Forged Fe-25wt%Cr Alloys at 1100°C in Air

Hui Xie; Lei Jia; Xiao Feng Zhang; Zhen Lin Lu

doi:10.4028/www.scientific.net/MSF.695.348

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HomeMaterials Science ForumMaterials Science Forum Vol. 695Oxidation Behavior of As-Forged Fe-25wt%Cr Alloys...

Oxidation Behavior of As-Forged Fe-25wt%Cr Alloys at 1100°C in Air

Abstract:

Fe-25wt%Cr alloys were fabricated by combining Powder Metallurgy (PM) with hot-forging treatment, and their oxidation behavior at 1100°C in air was investigated systematically by using XRD, SEM and EDS, respectively. The results showed that a composite oxidation scale containing both Cr₂O₃ and FeCr₂O₄ formed on the surface of as-forged Fe-25wt%Cr alloys after oxidation at 1100°C in air for 100 hours. The oxidation process of Fe-Cr alloys could be obviously divided into two different stages, and the kinetics of two-stage oxidation agreed well with the parabolic law. The first could be corresponding to the formation of protective Cr₂O₃ layer, while the second could be thought as the growth of FeCr₂O₄ and the further oxidation of the inner Cr₂O₃ oxidation scale. The faster oxidation rate in the second stage could be attributed to both the diffusion of iron ions rapider than that of Cr in the Cr₂O₃ layer and the fast transport velocity of oxygen ions along the cracks.

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Materials Science Forum (Volume 695)

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348-352

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https://doi.org/10.4028/www.scientific.net/MSF.695.348

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Online since:

July 2011

Authors:

Hui Xie, Lei Jia, Xiao Feng Zhang, Zhen Lin Lu

Keywords:

Diffusion, Fe-25wt%Cr Alloy, Oxidation Kinetic, Surface Morphology

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