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<p>Nickel-based single-crystal (SX) superalloys are essential for high-temperature aerospace applications. However, low-angle grain boundaries (LAGBs) can compromise mechanical integrity by disrupting γ′ phase alignment and promoting carbide precipitation. This study systematically investigates the effect of LAGB misorientation angle (4.8–17.8°) on the microstructure and tensile properties of DD413 superalloy at 900&#xa0;°C. It was found that specimens with LAGB angles below 10.8° exhibited stable tensile strength, whereas a sharp drop in elongation occurred at 10.8°, with both properties progressively degrading at higher angles. Notably, a transition to brittle fracture occurred at 13.3°, attributed to γ′ phase destabilization and the formation of interconnected carbide networks. These results determine critical misorientation thresholds for LAGB control in superalloy processing. The findings provide vital insights for enhancing the reliability of turbine blades operating under extreme conditions.</p>

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Effect of Low-Angle Grain Boundaries on Tensile Properties of a Nickel-Based Superalloy at 900 °C

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Qiao zhi Xu,
  • Si qian Zhang,
  • Ge Zhou,
  • Hao yu Zhang,
  • Dong Wang,
  • Li jia Chen

摘要

Nickel-based single-crystal (SX) superalloys are essential for high-temperature aerospace applications. However, low-angle grain boundaries (LAGBs) can compromise mechanical integrity by disrupting γ′ phase alignment and promoting carbide precipitation. This study systematically investigates the effect of LAGB misorientation angle (4.8–17.8°) on the microstructure and tensile properties of DD413 superalloy at 900 °C. It was found that specimens with LAGB angles below 10.8° exhibited stable tensile strength, whereas a sharp drop in elongation occurred at 10.8°, with both properties progressively degrading at higher angles. Notably, a transition to brittle fracture occurred at 13.3°, attributed to γ′ phase destabilization and the formation of interconnected carbide networks. These results determine critical misorientation thresholds for LAGB control in superalloy processing. The findings provide vital insights for enhancing the reliability of turbine blades operating under extreme conditions.