Microstructure and oxidation resistance of CoNiCrAlY coating manufactured by laser powder bed fusion
| Autor: | Chao Yang, Zeng Keli, Xiaoqiang Li, Ke Hu, Huiyun Li, Hao Luo, He Pengjiang, Cunliang Pan |
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| Rok vydání: | 2021 |
| Předmět: |
Equiaxed crystals
Materials science Oxide Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Microstructure Isothermal process Surfaces Coatings and Films Superalloy chemistry.chemical_compound Coating chemistry Materials Chemistry engineering Texture (crystalline) Composite material Layer (electronics) |
| Zdroj: | Surface and Coatings Technology. 427:127846 |
| ISSN: | 0257-8972 |
| Popis: | In this study, an IN718 superalloy matrix and its CoNiCrAlY coating were prepared using the laser powder bed fusion (LPBF) technique. The microstructure and isothermal oxidation properties of the CoNiCrAlY coating at 1100 °C were studied. The results showed that the CoNiCrAlY coating prepared by LPBF was dense, uniform, and crack-free. The coating was mainly composed of the γ phase, the β phase, and some Y2O3 microparticles. The microstructure along and perpendicular to the building direction consisted of columnar dendrites and equiaxed grains, respectively, with a strong (100) 〈001〉 cubic texture. The coating showed a low thermal growth oxide layer growth rate and a thin oxide layer during isothermal oxidation for 1–100 h. Cr2O3 oxides were initially formed on the surface of the coating. With an increase in the oxidation time, the α-Al2O3 scale and (Co,Ni)Cr2O4 and CoNiO2 mixed oxides were formed on the surface of the coating. |
| Databáze: | OpenAIRE |
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