Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-177-C9-186
Oxidation of ODS alloysW.J. Quadakkers
Research Centre Jülich, Institute for Reactor Materials, P.O. Box 19 13, 5170 Jülich, Germany
NiCr, NiCrAl and FeCrAl based Oxide Dispersion Strengthened (ODS) high temperature alloys possess far better oxidation resistance than dispersion free alloys of the same base composition. The presence of yttria dispersions leads to excellent scale adherence and a very selective oxidation of the scale forming element. Most of the observed differences in microstructure and protective properties between oxide scales on ODS and non-ODS alloys can be explained by differences in scale transport mechanisms. Although other dispersions have been found to have a positive effect on oxidation behaviour similar to that of yttria, they seem to possess no major advantage, provided that the yttria content is properly adjusted to the actual alloy system.
© EDP Sciences 1993