High-temperature oxidation and hot corrosion of Ni-based single crystal superalloy in the incubation stage

被引：15

作者：

Gong, Na ^{[1
]}

Meng, Tzee Luai ^{[1
]}

Teo, Siew Lang ^{[1
]}

Cao, Jing ^{[1
]}

Lee, Coryl J. J. ^{[1
]}

Tan, Chee Kiang Ivan ^{[1
]}

Tan, Dennis C. C. ^{[1
]}

Suwardi, Ady ^{[1
]}

Lin, Ming ^{[1
]}

Misra, R. D. K. ^{[2
]}

Liu, Hongfei ^{[1
]}

机构：

[1] ASTAR, Inst Mat Res & Engn IMRE, 2 Fusionopolis Way, Singapore 138634, Singapore

[2] Univ Texas Paso, Dept Met Mat & Biomed Engn, El Paso, TX 79968 USA

来源：

CORROSION SCIENCE | 2023年 / 214卷

关键词：

Hot corrosion; High-temperature oxidation; Ni-based single-crystal superalloy; Atomic diffusion; Sulfidation; ?-depletion; Grain coarsening and reorientation; METAL-OXIDES; BEHAVIOR; NICKEL; STABILITY; DIFFUSION; THICKNESS;

D O I：

10.1016/j.corsci.2023.111026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Early stages of high-temperature oxidation and hot corrosion of Ni-based single-crystal superalloy were studied at 900 degrees C by introducing sulfate coating. Detailed elemental and microstructural analysis revealed layered surface oxide, atomic diffusion, faceted Al-rich precipitation, and gamma '-phase depletion, together with grain coarsening and reorientation in the near-surface region. Undulated surface, multiple layered outer oxide scale, inner CrS scale (solely localized in gamma-matrix), and an additional gamma '-depleted region without crystal reorientation were observed in hot corrosion rather than in high-temperature oxidation. The corrosion behavior is discussed in terms of atomic diffusion and oxide growth. The impact of sulfate-coating is elucidated.

引用

页数：15

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