Influence of Ni content on the oxidation behavior of alumina-forming Co-based oxide dispersion strengthened superalloys at 900 °C

被引：7
|
作者：
Yu, Hao [1 ]
Kondo, Sosuke [1 ]
Kasada, Ryuta [1 ]
Ukai, Shigeharu [2 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Sendai 9808577, Japan
[2] Hokkaido Univ, Grad Sch Engn, Sapporo 0608628, Japan
来源：
CORROSION SCIENCE | 2023年 / 212卷
关键词：
Co-based superalloys; ODS; Alumina; TEM; HIGH-TEMPERATURE OXIDATION; DIFFUSION; NICKEL; SCALES; MICROSTRUCTURE; TRANSIENT; MECHANISM;
D O I：
10.1016/j.corsci.2022.110933
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This work systematically investigated the effect of Ni additions of 10, 20 and 30 at% on the oxidation behavior of oxide dispersion-strengthened (ODS) Co-20Cr-15Al (at%) superalloys at 900 degrees C in air. Alumina scale with a duplex structure consisting of outer 8-alumina and inner alpha-alumina was formed on all tested Co-based ODS superalloys. Ni addition reduced the oxidation rate by inhibiting the growth of the outer 8-alumina during initial oxidation and the inner alpha-alumina during prolonged exposure. Cr2O3 formation between the interface of the 8 -and alpha-alumina layers was confirmed with the increase of Ni content.
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页数：14
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