Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy
The solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy were systematically investigated through thermal analysis, Thermo-Calc simulation, the planar interface solidification experiment, and the directional solidification quenching exp...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785421000430 |
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| author | Kaili Cao Wenchao Yang Jiachen Zhang Chen Liu Pengfei Qu Haijun Su Jun Zhang Lin Liu |
| author_facet | Kaili Cao Wenchao Yang Jiachen Zhang Chen Liu Pengfei Qu Haijun Su Jun Zhang Lin Liu |
| author_sort | Kaili Cao |
| collection | DOAJ |
| description | The solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy were systematically investigated through thermal analysis, Thermo-Calc simulation, the planar interface solidification experiment, and the directional solidification quenching experiment. The main solidification transition temperature, segregation behavior, and solidification path were analyzed, and the microstructure evolution and phase formation mechanism were also discussed. The solidification began with the formation of primary γ dendrites (L → γ). Then Ni, Al, Ta, and Ru were enriched in the residual liquid, resulting in the precipitation of β-NiAl phase (L → β-NiAl). As the β-NiAl phase grew, the content of Ta gradually increased while the content of Al gradually decreased. Thus, the peritectic γ′ phases were precipitated on the surface of β-NiAl phase and coarsened by the incomplete peritectic reaction (L + β-NiAl → peritectic γ′ + β-NiAlResidual). The Al content further decreased and the Ta content further increased with the precipitation of the peritectic γ′ phase, leading to the formation of γ/γ′ eutectics on the surface of the γ dendrites or directly from liquid (L → γ/γ′ eutectic). Since the precipitation of β-NiAl phase and the subsequent incomplete peritectic reaction, Cr, Co, Mo, W, and Re were rejected into the residual liquid in the vicinity of β-NiAl phase, providing conditions for the nucleation of the TCP(R) phases (L → R). The wide freezing range of the alloy might be the cause of the severe micro-segregation and the precipitation of some secondary phases in the interdendritic regions. |
| first_indexed | 2024-12-19T10:29:54Z |
| format | Article |
| id | doaj.art-09ead4cfe228489390bdb9ad9ede8bab |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-19T10:29:54Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-09ead4cfe228489390bdb9ad9ede8bab2022-12-21T20:25:46ZengElsevierJournal of Materials Research and Technology2238-78542021-03-0111474486Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloyKaili Cao0Wenchao Yang1Jiachen Zhang2Chen Liu3Pengfei Qu4Haijun Su5Jun Zhang6Lin Liu7State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaCorresponding author.; State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaCorresponding author.; State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an, 710072, ChinaThe solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy were systematically investigated through thermal analysis, Thermo-Calc simulation, the planar interface solidification experiment, and the directional solidification quenching experiment. The main solidification transition temperature, segregation behavior, and solidification path were analyzed, and the microstructure evolution and phase formation mechanism were also discussed. The solidification began with the formation of primary γ dendrites (L → γ). Then Ni, Al, Ta, and Ru were enriched in the residual liquid, resulting in the precipitation of β-NiAl phase (L → β-NiAl). As the β-NiAl phase grew, the content of Ta gradually increased while the content of Al gradually decreased. Thus, the peritectic γ′ phases were precipitated on the surface of β-NiAl phase and coarsened by the incomplete peritectic reaction (L + β-NiAl → peritectic γ′ + β-NiAlResidual). The Al content further decreased and the Ta content further increased with the precipitation of the peritectic γ′ phase, leading to the formation of γ/γ′ eutectics on the surface of the γ dendrites or directly from liquid (L → γ/γ′ eutectic). Since the precipitation of β-NiAl phase and the subsequent incomplete peritectic reaction, Cr, Co, Mo, W, and Re were rejected into the residual liquid in the vicinity of β-NiAl phase, providing conditions for the nucleation of the TCP(R) phases (L → R). The wide freezing range of the alloy might be the cause of the severe micro-segregation and the precipitation of some secondary phases in the interdendritic regions.http://www.sciencedirect.com/science/article/pii/S2238785421000430Ru-containing superalloyDirectional solidificationAs-cast microstructureSolidification transition temperatureSegregation behaviorSolidification path |
| spellingShingle | Kaili Cao Wenchao Yang Jiachen Zhang Chen Liu Pengfei Qu Haijun Su Jun Zhang Lin Liu Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy Journal of Materials Research and Technology Ru-containing superalloy Directional solidification As-cast microstructure Solidification transition temperature Segregation behavior Solidification path |
| title | Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy |
| title_full | Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy |
| title_fullStr | Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy |
| title_full_unstemmed | Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy |
| title_short | Solidification characteristics and as-cast microstructures of a Ru-containing nickel-based single crystal superalloy |
| title_sort | solidification characteristics and as cast microstructures of a ru containing nickel based single crystal superalloy |
| topic | Ru-containing superalloy Directional solidification As-cast microstructure Solidification transition temperature Segregation behavior Solidification path |
| url | http://www.sciencedirect.com/science/article/pii/S2238785421000430 |
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