Research and Development Progress of Oxidation Resistant Low Expansion GH6783 Alloy
This paper summarizes the development history and application performance research results of domestic and foreign scholars on anti-oxidation low expansion In783 alloy. The resistance of stress accelerated grain boundary oxidation （SAGBO） performance of the alloy has been greatly improved by β phase...
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Special Steel
2025-08-01
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| Series: | Teshugang |
| Subjects: | |
| Online Access: | https://www.specialsteeljournal.com/fileup/1003-8620/PDF/2024-00173.pdf |
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| Summary: | This paper summarizes the development history and application performance research results of domestic and foreign scholars on anti-oxidation low expansion In783 alloy. The resistance of stress accelerated grain boundary oxidation （SAGBO） performance of the alloy has been greatly improved by β phase precipitation， which makes the alloy exhibit low thermal expansion coefficient （CTE）， good oxidation resistance and comprehensive mechanical performance below 750 ℃. It is widely used in the manufacturing of sealing components for aviation engines and bolts for ultra supercritical steam turbines. The research results of domestic scholars on the microstructure and properties of GH6783 alloy （Chinese grade GH6783） during domestication process are summarized. After long-term service， needle shaped Ni5Al3 phase precipitates inside the β phase， significantly deteriorating the plasticity of GH6783 alloy at 650 ℃. The anatomy analysis of the microstructure of currently imported In783 alloy rods reveals that the uniformity of the β phase microstructure was far worse than the results reported in the literature. It not only contains a large mass of primary β microstructure， but also has a suspected needle-like Ni5Al3 phase inside the β phase. Daye Special Steel Co.， Ltd. has conducted systematic research on the double vacuum smelting， electrode annealing， high-temperature homogenization and forging process of GH6783 alloy， and achieved significant results， with a significant improvement in the uniformity of microstructure and mechanical properties of GH6783 rod material. Regarding to serious anisotropy high tensile plasticity at 650°C of GH6783 alloys rods produced at home and abroad， it is found that this is related to the orientation of the γ' phase， and the relevant research work is being further conducted.Finally， the application prospects and future research directions of GH6783 alloy are discussed to meet the major national demands and the demand for advanced high-temperature alloy materials for sustainable social development. |
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| ISSN: | 1003-8620 |