Microstructure evolution and properties of GH4169 alloy after  high temperature and stress aging treatment

doi:10.13251/j.issn.0254-6051.2023.12.033

Abstract

Abstract: Taking GH4169 superalloy as the research object, the microstructure evolution, residual strength and fatigue life and the relevant mechanisms were studied through tensile and fatigue test after high-temperature aging and high-temperature coupled stress aging treatment under different conditions. The results show that the structure of the GH4169 alloy is stable when aged at 550 ℃, and after high temperature aging at 650 ℃, the γ″ phase begins to coarsen and the γ″→δ transformation occurs under the action of stress, the strength and lifetime are reduced. After high temperature aging at 700 ℃ the γ″→δ phase transformation is obvious, and the coupled stress further promotes the phase transformation. The fatigue life of the GH4169 alloy is greatly reduced by cracking of the surface under the persistent environment of high temperature coupled stress.

Key words: GH4169 superalloy, high temperature aging, high temperature stress aging, microstructure, surface oxidation cracking, fatigue life

CLC Number:

TG132.3⁺2

Cui Wenming, Wang Jixing, Zou Jiajia, Zhang Xiaochen, Zhang Kai, Liang Xibing, Zhang Rui, Zang Haoliang. Microstructure evolution and properties of GH4169 alloy after high temperature and stress aging treatment[J]. Heat Treatment of Metals, 2023, 48(12): 194-200.

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Microstructure evolution and properties of GH4169 alloy after high temperature and stress aging treatment

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