Effect of Two-stage Aging Time on Microstructure and Mechanical Properties of GH4706 Superalloy
The effects of two-stage aging time at 720 ℃ and 620 ℃ on the η phase and γ'/γ'' phase of GH4706 superalloy were studied using optical microscopy， scanning electron microscopy， etc. The room temperature strength， impact， and creep rupture life of the material were tested under differe...
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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/2025-00069.pdf |
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| Summary: | The effects of two-stage aging time at 720 ℃ and 620 ℃ on the η phase and γ'/γ'' phase of GH4706 superalloy were studied using optical microscopy， scanning electron microscopy， etc. The room temperature strength， impact， and creep rupture life of the material were tested under different aging times. The results showed that the room temperature strength changed little at 720 ℃ and 620 ℃ two-stage aging with increasing aging time， the room temperature impact performance decreased， and the creep rupture fracture time gradually increased； Meanwhile， the quantity and size of the η phase gradually increased with the increase of aging time， and the shape of the η phase gradually changed from strip to block， while the morphology of the γ ´/γ´´ phase changed relatively little， and the γ´/γ´´ phase coarsened with the increase of aging time； By analyzing the evolution laws of γ '/γ'' phases and η phases of alloy under different aging time conditions， it was revealed that appropriate coarsening of γ´/γ´´ phases can improve the room temperature strength and high temperature durability under different aging time conditions， while the coarsening of η phases can significantly reduce the room temperature impact performance and strength of matrix， but can obviously improve the high temperature durability. |
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| ISSN: | 1003-8620 |