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<p>This study presents an integrated investigation into the hot workability and strengthening mechanisms of Udimet 520 nickel-based superalloy, combining thermodynamic calculations with processing maps. Thermodynamic analysis identified the γ′ phase precipitation temperature at 1058&#xa0;°C, establishing a hot working window above this temperature to minimize deformation resistance. Hot compression tests conducted on a Gleeble−3500 simulator at 1090–1180&#xa0;°C and strain rates of 0.1–10&#xa0;s<sup>-1</sup> revealed that flow behavior transitions from dynamic recrystallization (DRX) at lower strain rates to dynamic recovery at 10&#xa0;s<sup>-1</sup>. Processing maps indicate that instability concentrates in low-temperature and high-strain-rate regions, with optimal workability achieved at 1090–1180&#xa0;°C and 0.1–1&#xa0;s<sup>-1</sup>, under a maximum true strain of 0.5. Multi-pass upsetting and stretching under these parameters produced crack-free forgings with uniform microstructures. After solution treatment and aging, the alloy developed fine equiaxed grains and a homogeneous dispersion of trapezoidal γ′ precipitates, which collectively contribute to an excellent strength–ductility balance. These findings provide a scientifically grounded framework for process design and microstructure control in industrial hot forging of Udimet 520.</p>

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An Integrated Study on Hot Workability and Strengthening Mechanisms of Udimet 520 via Thermodynamic Calculation and Processing Maps

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Zhiqiang Hu,
  • Yegao Chen,
  • Xinxing Li,
  • Kaikun Wang

摘要

This study presents an integrated investigation into the hot workability and strengthening mechanisms of Udimet 520 nickel-based superalloy, combining thermodynamic calculations with processing maps. Thermodynamic analysis identified the γ′ phase precipitation temperature at 1058 °C, establishing a hot working window above this temperature to minimize deformation resistance. Hot compression tests conducted on a Gleeble−3500 simulator at 1090–1180 °C and strain rates of 0.1–10 s-1 revealed that flow behavior transitions from dynamic recrystallization (DRX) at lower strain rates to dynamic recovery at 10 s-1. Processing maps indicate that instability concentrates in low-temperature and high-strain-rate regions, with optimal workability achieved at 1090–1180 °C and 0.1–1 s-1, under a maximum true strain of 0.5. Multi-pass upsetting and stretching under these parameters produced crack-free forgings with uniform microstructures. After solution treatment and aging, the alloy developed fine equiaxed grains and a homogeneous dispersion of trapezoidal γ′ precipitates, which collectively contribute to an excellent strength–ductility balance. These findings provide a scientifically grounded framework for process design and microstructure control in industrial hot forging of Udimet 520.