Effect of dendritic orientation on the high temperature oxidation kinetic of tantalum-containing nickel-base alloys
Résumé
The aim of this work is the study of the possible effect of surface dendritic orientation on the high-temperature oxidation behavior of two chromia-forming Ni-base alloys with two tantalum contents (3 and 6% wt). Samples were prepared by special cutting orientation with regard to the external surface. Thermogravimetry tests were run at 1000, 1100 and 1200°C and parabolic oxidation constants were considered. The mathematical process of the raw data was performed taking into account the effect of the transient oxidation. When the sample surface is mainly parallel to the dendritic network, the oxidation parabolic constant is higher than for a surface perpendicular to dendrites. The situation is contrary for the transient oxidation linear constant.
Domaines
Matériaux
Origine : Fichiers produits par l'(les) auteur(s)
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