Abstract
The effects of adding 1 wt.% Al element on the oxidation behavior of CM-247LC Ni-based superalloy are studied under high temperature conditions, namely, 1000°C and 1150°C dry air isothermal oxidation test. The microstructure of oxides, γ matrix and γ' precipitate are observed and analyzed by using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Furthermore, the impacts of high temperature oxidation behavior and phase stability are realized. The results indicated that adding 1 wt.% Al could promote γ' phase precipitate, which directly increases the volume fraction of γ' phase in the substrate microstructure. Consequently, by adding 1 wt.% Al in CM-247LC Ni-based superalloys, the enhancement of Al activity and the formation of continuous Al2O3 protection layer to improve oxidation resistance are significantly promoted.