Influence of Nb addition on the oxidation behavior of novel Ni-base superalloy. (June 2021)

• Record Type: Journal Article
• Authors: Ye, Xianjue; Yang, Biaobiao; Nie, Yan; Yu, Shu; Li, Yunping
• Is Part Of: Corrosion science. Volume 185(2021)
• Publication Date: 2021-06
• Subjects: Superalloy -- Niobium -- Oxidation -- CrTaO4; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109436
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Influence of Nb on oxidation of superalloy was investigated. Nb enhanced the formation of compact TiO2 on Cr2 O3 layer. Nb enhanced the formation of continuous CrTaO4 beneath the Cr2 O3 . Nb enhanced the oxidation resistance of alloy. Abstract: Influence of Nb on oxidation behavior of novel Ni-base superalloy was investigated in detail at 1000 °C. Although alloy with 2 wt%Nb (2Nb) exhibits significantly higher weight gain than alloy without Nb (0Nb), oxide scale of 2Nb was more continuous and compact. In contrast, 0Nb underwent severe vaporization and spallation in oxide scale. Nb was found to accelerate the formation of compact TiO2 on Cr2 O3 layer, leading to inhibited vaporization and spallation in oxide scale. Nb also accelerated the formation of continuous CrTaO4 layer beneath the Cr2 O3, enhancing the oxidation resistance via inhibiting the interdiffusion of oxygen, nitrogen and metallic elements.