High temperature oxidation behavior of Ni-based superalloy Nimonic95 and the effect of pre-oxidation treatment. (December 2021)

• Record Type: Journal Article
• Authors: Li, Danhong; Chen, Junxiu; Etim, Iniobong P.; Liu, Ya; Wu, Changjun; Wang, Jianhua; Su, Xuping
• Is Part Of: Vacuum. Volume 194(2021)
• Publication Date: 2021-12
• Subjects: Ni-based superalloy -- Oxidation behavior -- High-temperature pre-oxidation; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2021.110582
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The high-temperature oxidation behaviors of Nimonic95 alloy at 800 °C, 900 °C and 1000 °C were studied. The diffusion process of alloying elements in different stages of oxidation was studied and analyzed, and the pre-oxidation process was established. The results showed that multilayer oxide films formed in the air at 800 °C, 900 °C and 1000 °C, the outer layer was mainly Cr2 O3 with a small amount of Al2 O3, TiO2 and composite oxides such as CrTi spinel. The inner layer was mainly Al2 O3 . Nimonic95 alloy has excellent oxidation resistance at 800 °C and 900 °C, but poor oxidation resistance at 1000 °C and the oxide film peeled off in a short time. The oxidation resistance of Nimonic95 alloy at 1000 °C can be improved significantly by pre-oxidation at 800 °C for 140 h. Highlights: The oxidation behavior of Nimonic95 alloy at 800 °C, 900 °C and 1000 °C was studied. The diffusion mechanism of the alloy elements during different stages of oxidation was revealed. The mechanism of improving the oxidation resistance of Nimonic95 alloy at 1000 °C by pre-oxidation process was revealed.