Effect of Nb addition on the internal oxidation of novel Ni-base superalloy. (15th April 2022)

• Record Type: Journal Article
• Authors: Ye, Xianjue; Yang, Biaobiao; Lai, Ruilin; Liu, Jiantao; Yu, Shu; Li, Yunping
• Is Part Of: Corrosion science. Volume 198(2022)
• Publication Date: 2022-04-15
• Subjects: Internal oxidation -- Niobium -- Superalloy -- Diffusion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110100
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Influence of Nb addition on the internal oxidation of a novel powder metallurgy superalloy was studied. The results indicated that higher Nb concentration leads to deeper internal oxidation but narrower γ′ phase depletion region. Nb enhanced the partition of more Al into γ′ phase, which slows down the outward diffusion of Al and hence promotes the nucleation of Al2 O3 in alloy matrix, giving rise to less impediment to the inward diffusion of O. Thus, Nb addition leads to deeper penetration of O into alloy matrix or deeper internal oxidation. Highlights: Influence of Nb on Internal oxidation of superalloy was studied. Nb enhanced the internal oxidation depth. Nb decreased the width of γ′ phase depletion region. Lowered Al diffusion by Nb accounts for these behavior.