Effect of solution treatment on microstructure and properties of powder metallurgy GH4099 alloy

doi:10.13251/j.issn.0254-6051.2022.07.015

Abstract

Abstract: Powder metallurgy GH4099 superalloy was prepared by plasma rotating electrode process (PREP) and hot isostatic pressing (HIP). The effect of solution treatment temperature on microstructure evolution and tensile properties at room temperature and high temperature was studied. The results indicate that the microstructure of the PM GH4099 alloy is uniform, the grain size is close to original particle size (~50 μm) and no component segregation. The large-sized primary γ′ phase and carbides are interlaced at the grain boundaries, and there are a large number of annealing twins inside the grains. With the increase of solution treatment temperature, the γ phase grains grow gradually, and the carbides at the grain boundaries transfer from discontinuous to continuous distribution. When the solution treatment temperature is 1140 ℃, the room/high temperature tensile properties equivalent to those of rolling/forging parts can be obtained, but the plasticity is low, the tensile fracture presents brittle cleavage fracture morphology, which is mainly related to the precipitation of carbides at prior particle boundaries during heat treatment.

Key words: GH4099 superalloy, hot isostatic pressing, solution treatment, microstructure evolution, mechanical properties

CLC Number:

TG132.3⁺2

Wang Hua, Wang Zeyu, Song Jiaming, Qu Zonghong, Lai Yunjin, Liang Shujin. Effect of solution treatment on microstructure and properties of powder metallurgy GH4099 alloy[J]. Heat Treatment of Metals, 2022, 47(7): 86-91.

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