Abstract
Nickel-base alloys, such as Astroloy, used for aeronautical turbine disks, are sensitive to time-dependent cracking in environments containing oxygen. The “mosaic” structure of the alloy consisting γ′ islands (200 nm average size) surrounded by the γ-phase (100 nm thick) induces complex oxidation phenomena. Various analytical approaches allow the delineation of all the steps from segregation to oxidation occurring on the surface of such a duplex structure. The protection of Astroloy by its outer oxide layer against oxygen penetration was studied also, using alternative 16O2 then 18O2 oxidation. In association with STEM studies, it is shown that the outer oxide scale is not a real barrier against oxygen penetration and that inner precipitation of chronium (+ aluminium and titanium)-enriched oxides, takes place especially in the γ structure.
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Moulin, G., Mons, C., Severac, C. et al. Analytical study of surface and bulk oxidation of Astroloy. Oxid Met 40, 85–108 (1993). https://doi.org/10.1007/BF00665260
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DOI: https://doi.org/10.1007/BF00665260