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<p>This study investigates the effects of distinct heat treatment processes on the microstructure and high-temperature mechanical properties of a novel nickel-based single-crystal superalloy. The findings indicate that the optimal heat treatment regime for this alloy is as follows: 1300&#xa0;°C/2&#xa0;h + 1340&#xa0;°C/2&#xa0;h + 1345&#xa0;°C/2&#xa0;h + 1350&#xa0;°C/6&#xa0;h (air cooling) + 1140&#xa0;°C/4&#xa0;h (air cooling) + 920&#xa0;°C/24&#xa0;h (air cooling). After subjecting the alloy to this regime, the <i>γ</i>′ phase exhibits a regular cubic morphology with ordered arrangement and uniform distribution, having an average size of approximately 0.55&#xa0;μm. The <i>γ</i> matrix channels are well-defined and regular, and the area fraction of the <i>γ</i>′ phase reaches 70.3%, which contributes to a significant enhancement of the alloy’s high-temperature mechanical properties. At 1100&#xa0;°C, the alloy achieves a tensile strength of 728.4&#xa0;MPa, a yield strength of 633.9&#xa0;MPa, and an elongation of 13.9%. The regularly and uniformly distributed cubic <i>γ</i>′ phase in the microstructure after optimal heat treatment not only provides a stable and uniform deformation framework for the alloy but also strengthens the resistance to dislocation motion. This ultimately optimizes the strengthening efficiency of the <i>γ</i>′ phase significantly, realizing a synergistic improvement in strength and plasticity.</p>

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Effects of Heat Treatment on Microstructure and Properties of a Novel Nickel-Based Single-Crystal Superalloy

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Xiaolong Bai,
  • Xiangfeng Liang,
  • Yong Dai,
  • Li Zhang,
  • Fangmiao Duan,
  • Tao Zhang,
  • Ruining Yang,
  • Changkun Shi,
  • Yutao Zhao

摘要

This study investigates the effects of distinct heat treatment processes on the microstructure and high-temperature mechanical properties of a novel nickel-based single-crystal superalloy. The findings indicate that the optimal heat treatment regime for this alloy is as follows: 1300 °C/2 h + 1340 °C/2 h + 1345 °C/2 h + 1350 °C/6 h (air cooling) + 1140 °C/4 h (air cooling) + 920 °C/24 h (air cooling). After subjecting the alloy to this regime, the γ′ phase exhibits a regular cubic morphology with ordered arrangement and uniform distribution, having an average size of approximately 0.55 μm. The γ matrix channels are well-defined and regular, and the area fraction of the γ′ phase reaches 70.3%, which contributes to a significant enhancement of the alloy’s high-temperature mechanical properties. At 1100 °C, the alloy achieves a tensile strength of 728.4 MPa, a yield strength of 633.9 MPa, and an elongation of 13.9%. The regularly and uniformly distributed cubic γ′ phase in the microstructure after optimal heat treatment not only provides a stable and uniform deformation framework for the alloy but also strengthens the resistance to dislocation motion. This ultimately optimizes the strengthening efficiency of the γ′ phase significantly, realizing a synergistic improvement in strength and plasticity.