Effect of long-term aging at 700 ℃ on microstructure and mechanical properties of GH4706 alloy

doi:10.13251/j.issn.0254-6051.2025.04.016

Abstract

Abstract: Microstructure and mechanical properties of GH4706 alloy after long-term aging at 700 ℃ were analyzed by means of scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and tensile test. The reason for abnormal grain growth of the GH4706 alloy during long-term aging was investigated. The results show that after aging at 700 ℃ for 5000 h, γ ′phase in the GH4706 alloy changes from disk to long strip, and the needle η phase at the grain boundary distributes like Widmanstatten structure. The precipitation free zone on both sides widens and weakens the grain boundary, and affects the mechanical properties of the GH4706 alloy. With the increase of aging time, the number of large angle grain boundaries decreases gradually, the number of twins decreases, and the grains coarsen and grow by merging common twins. In the long-term aging process, the mechanical properties of the alloy show a continuous decreasing trend with the extension of aging time.

Key words: GH4706 alloy, long-term aging, microstructure evolution, mechanical properties

CLC Number:

TG156.92

Huang Jialiang, Xu Yeling, Hou Xiangyi, Wang Chong, Duan Ran, Huang Shuo, Lian Xintong. Effect of long-term aging at 700 ℃ on microstructure and mechanical properties of GH4706 alloy[J]. Heat Treatment of Metals, 2025, 50(4): 106-113.

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