Effect of aging treatment on microstructure and hardness  of Ni-based single crystal superalloy

doi:10.13251/j.issn.0254-6051.2023.12.004

Abstract

Abstract: For Ni-based single crystal superalloy aged for different time (0, 100, 500, 1000 h) with different volume fractions of γ′ phase (30% and 60%), the effect of aging treatment on microstructure and hardness of the tested alloy was studied by X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM) and nanoindentation experiment. The results show that with the increase of aging time, the size of γ′ phase gradually increases. The morphologies of precipitates in the specimen with the γ′ phase volume fraction of 30% and 60% are spherical and cubic shape, respectively, and the morphologies of γ′ phase do not change significantly with the aging time. At the same time, due to the high content of refractory elements in the alloy with γ′ phase volume fraction of 60%, the TCP phase is produced during aging treatment. After aging treatment, the specimens with different γ′ phase volume fractions show a significant hardening effect, and the analysis indicates that the mechanism of γ′ phase strengthening is not changed. The height of the material pile-up around the indentation increases gradually with the increase of aging time, while the pile-up effected range decreases gradually.

Key words: Ni-based single crystal superalloy, aging, microstructure, nanoindentation, hardness

CLC Number:

TB301

Li Ke, Wei Liming, Liang Yanxiang, Luo Aibo, Li Jicheng, Zhang Shunyong. Effect of aging treatment on microstructure and hardness of Ni-based single crystal superalloy[J]. Heat Treatment of Metals, 2023, 48(12): 21-28.

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Effect of aging treatment on microstructure and hardness of Ni-based single crystal superalloy

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