Influence of cold deformation and heat treatment on microstructure and properties of GH738 nickel-based alloy

doi:10.13251/j.issn.0254-6051.2025.03.004

Abstract

Abstract: GH738 nickel-based superalloy was subjected to three deformation levels (10%, 20%, 30%) of cold deformation, followed by heat treatment consisting of annealing at 1040 ℃ for 0.5 h, aging at 800 ℃ for 8 h, and further aging at 600 ℃ for 8 h. The changes in microstructure and mechanical properties of the alloy under different processing conditions were investigated. The results show that the GH738 nickel-based superalloy primarily consists of γ′, γ, TiC, and Cr₂₃C₆ phases. As the deformation level increases, the grain size of the heat-treated GH738 nickel-based superalloy gradually decreases from 44.41 μm in the solution-treated state to 22.03 μm. The γ′ precipitates gradually redissolve into the matrix, with their size becoming more uniform and decreasing from 165 nm to 102 nm. Cold deformation and heat treatment significantly enhance the tensile strength, yield strength, and hardness of the GH738 nickel-based superalloy, and to some extent, improve the alloy's ductility and toughness.

Key words: nickel-based alloy, microstructure, mechanical properties, heat treatment

CLC Number:

TG146.23

Wang Chang, Wang Liang, Zhou Peishan, Shen Wenzhu, Wang Bin. Influence of cold deformation and heat treatment on microstructure and properties of GH738 nickel-based alloy[J]. Heat Treatment of Metals, 2025, 50(3): 25-31.

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