Effect of Cr and Y2O3 on the oxidation behavior of Co-based oxide dispersion strengthened superalloys at 900 °C. (October 2017)

• Record Type: Journal Article
• Authors: Yu, Hao; Ukai, Shigeharu; Hayashi, Shigenari; Oono, Naoko Hori
• Is Part Of: Corrosion science. Volume 127(2017)
• Page Start: 147
• Page End: 156
• Publication Date: 2017-10
• Subjects: A. Cobalt -- A. Alumina -- B. EPMA -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2017.08.013
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Oxidation of Co-based oxide dispersion strengthened alloys were characterized at 900 °C in air. Influences of Cr and Y2 O3 addition on the oxidation behavior were investigated. Alumina-forming Co-based ODS superalloys were developed to be used at elevated temperature. Abstract: In order to study the effect of Cr and Y2 O3 addition on the oxidation behavior of novel Co-20Cr-10Al (wt.%) oxide dispersion strengthened (ODS) superalloys, an isothermal oxidation test was carried out at 900 °C in air. The addition of Cr altered the oxide scale from the multilayered scale with an external Co oxide/CoAl2 O4 and an inner Al2 O3 to a single Al2 O3 scale. Y2 O3 addition increased oxidation mass gain slightly but improved spallation resistance of the external Al2 O3 scale.