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The effects of heat treatment and implantation of aluminium on the oxidation resistance of FeCrAlY alloys

Bernabai, U. ; Cavallini, M. ; Bombara, G. ; Dearnaley, G. ; Wilkins, M.A.

Corrosion science, 1980, Vol.20 (1), p.19-25 [Periódico revisado por pares]

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Título:
The effects of heat treatment and implantation of aluminium on the oxidation resistance of FeCrAlY alloys
Autor: Bernabai, U. ; Cavallini, M. ; Bombara, G. ; Dearnaley, G. ; Wilkins, M.A.
É parte de: Corrosion science, 1980, Vol.20 (1), p.19-25
Descrição: The oxidation resistance of FeCrAlY alloys is known to be due to the rapid formation of a protective film containing α-Al 2O 3. The near-surface concentration of Al has been increased by ion implantation, and for a dose of 10 17 Al + ions cm −2 (equivalent to 4.5 μ cm −3 the parabolic oxidation rate constant has been reduced by a factor of 140 in tests at 1100°C. Heat treatment prior to oxidation also proved beneficial for reasons which are discussed. These relate to the diffusivity of Cr and other spinel-forming elements within the metal. Analysis of Al +-implanted steels after oxidation, using ESCA and EDS techniques, confirmed the high concentration of Al 2O 3 within the oxide, and SEM examination showed that the scale is much more compact than in the unimplanted case. Suggestions are made for enhancing still further the efficacy of Al + implantation as a means of improving oxidation resistance and for optimizing the synergistic effect of yttrium and aluminium.
Editor: Elsevier Ltd
Idioma: Inglês

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