Effect of Two-stage Aging Time on Microstructure and Mechanical Properties of GH4706 Superalloy

doi:10.20057/j.1003-8620.2025-00069

Abstract

Abstract: 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.

Key words: GH4706 Superalloy, Aging Time, Precipitation, Mechanical Properties

摘要： 采用光学显微镜、扫描电镜等研究了720、620 ℃双级时效时间对GH4706合金η相以及γ´/γ´´相的影响，并测试了其不同时效时间的室温强度、冲击性能和持久性能。结果表明，720、620 ℃双级时效，随着时效时间增加，室温强度变化较小，室温冲击性能不断降低，持久断裂时间逐渐增加；同时，η相的数量、尺寸随着时效时间增加逐渐增加，并且η相形貌逐渐由条状转变为块状，而γ´/γ´´相形貌变化较小，但γ´/γ´´相随着时效时间增加发生粗化。通过分析不同时效时间条件下合金γ′/γ′′相和η相的演变规律，揭示了不同时效时间条件下γ´/γ´´相适当粗化可提高室温强度和高温持久性能，η相显著降低基体室温冲击性能和强度，但可以明显提高高温持久性能。

关键词: GH4706合金, 时效时间, 析出, 力学性能

CLC Number:

TG162.83

Li　Zhentuan, Huang　Shuo, Wang　Chong, Duan　Ran, Qin　Heyong, Zhao　Guangpu. Effect of Two-stage Aging Time on Microstructure and Mechanical Properties of GH4706 Superalloy[J]. Special Steel, 2025, 46(4): 157-162.

李振团, 黄烁, 王冲, 段然, 秦鹤勇, 赵光普. 双级时效时间对GH4706合金组织性能的影响[J]. 特殊钢, 2025, 46(4): 157-162.

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