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<p>The effects of solution treatment before compression and subsequent aging treatment on the microstructure and mechanical properties of a nickel-based superalloy were investigated. The microstructure evolution during compression and heat treatment was studied with optical microscope, scanning electron microscopy, and electron backscatter diffraction. The results show that solution treatment significantly changes the dissolution behavior of the prior particle boundary and the second phase, which affects the grain size and recrystallization behavior during compression. The mean grain size decreased from 9 ± 1 to 4 ± 1 µm after 6&#xa0;h holding at 1150 ℃ before compression, while the size of secondary γ’ precipitates changed slightly, and the shape changed from petaloid shape to near spherical shape. After aging treatment, the distribution of grains and precipitated phases was more uniform, and the mechanical properties were significantly improved. The strength and plasticity of the sample 3 after aging treatment have been significantly enhanced simultaneously. The tensile strength increased from 966 to 1735&#xa0;MPa, and the elongation increased from 20.8 to 31.7%.</p> Graphical abstract <p></p>

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Evolution mechanism of microstructure and its influence on mechanical properties of a nickel-based superalloys during solution treatment and aging process

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Yanhui Liu,
  • Miao Wang,
  • Zhaozhao Liu,
  • Zhaoxu Liu,
  • Yuzhi Li,
  • Guang Yang,
  • Qing Li

摘要

The effects of solution treatment before compression and subsequent aging treatment on the microstructure and mechanical properties of a nickel-based superalloy were investigated. The microstructure evolution during compression and heat treatment was studied with optical microscope, scanning electron microscopy, and electron backscatter diffraction. The results show that solution treatment significantly changes the dissolution behavior of the prior particle boundary and the second phase, which affects the grain size and recrystallization behavior during compression. The mean grain size decreased from 9 ± 1 to 4 ± 1 µm after 6 h holding at 1150 ℃ before compression, while the size of secondary γ’ precipitates changed slightly, and the shape changed from petaloid shape to near spherical shape. After aging treatment, the distribution of grains and precipitated phases was more uniform, and the mechanical properties were significantly improved. The strength and plasticity of the sample 3 after aging treatment have been significantly enhanced simultaneously. The tensile strength increased from 966 to 1735 MPa, and the elongation increased from 20.8 to 31.7%.

Graphical abstract