Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-591-C9-597
The effect of implanted yttrium on the oxidation behaviour of Fe-20Cr-5Al alloy at 1373 K in airJ. Jedlinski1, 2, M. Krasovec1, G. Borchardt1 and J.W. Quadakkers3
1 Institut für Allgemeine Metallurgie, Technische Universität Clausthal, Robert-Koch-Str. 42, D-3392 Clausthal- Zellerfeld, Germany
2 Faculty of Materials Science and Ceramics, Academy of Mining and Metallurgy, Al. Mickiewicza 30, Pl. 30-059 Krakow, Poland.
3 Research Center Jülich, PO. Box 1913, D-5170 Jülich, Germany
The influence of implanted yttrium on the oxidation behaviour of an Fe-20Cr-5Al alloy was studied at 1373 K in air under isothermal and thermal cycling conditions in order to verify previous results obtained at 1473 K which indicated no beneficial effect of this addition. The implanted yttrium substantially improved the scale resistance to spalling, only slightly affected the scale growth rate, and altered the scale morphology. On unimplanted material developed ridged scales, while yttrium promoted the formation of buckled oxide layers, the higher the dose the more buckled the scale. After spalling of the scale from yttrium implanted material due to prolonged thermal cycling ridges were growing instead of buckles. These and previous results showed that the efficiency of the implanted yttrium depends on its amount in the substrate and on the reaction temperature as well and that there is no simple correlation between the scale thickness and its resistance to spalling.
© EDP Sciences 1993