High temperature oxidation of additively manufactured Rene 65

This paper investigates the initial oxidation stages of additive manufactured Rene 65 Ni-based superalloy between 700 and 900 °C in air and argon for 48 h, with different building directions and heat treatments. The results show that the only factor that impact the oxidation behavior is the oxidizing atmosphere. The resulting thin oxide scales are made of NiCr2O4 and Cr2O3 at 700 °C while at 800 and 900 °C the oxide layer is composed of an external Cr2O3 layer on top of an internal layer of α-Al2O3 due to the lower partial pressure of oxygen underneath the chromia layer.