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<p>To address the escalating demand for high-temperature materials in aerospace hot-end components, this study examined scan speed, laser power, and scan rotation angle parameters to determine the effects of the powder bed fusion process on the mechanical properties of high temperature hard-to-weld K77 material. While the scan rotation angle was determined to be the parameter that most affected the microstructure, 67° scan rotation angle, 800&#xa0;mm/s scan speed, and 180&#xa0;W laser power were found to be the most suitable parameters to ensure the highest tensile strength. The tensile strength obtained in the verification test was measured at 1420.5 ± 39.45&#xa0;MPa after heat-treatment. The findings increase the application potential of laser powder bed fusion (LPBF) technology with K77 material and provide valuable information for process optimization. The results can significantly contribute to strategies to increase tensile strength and improve material performance in industrial production processes.</p>

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Grain regulation and boosting mechanical properties of K77 superalloy in LPBF process by rotation scanning strategy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月21日

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  • Hang You,
  • Guang Fu,
  • Tao Zhang,
  • Shangkun Jin,
  • Qingpeng Zeng,
  • Shijun Chen,
  • Yuanyuan Zhou,
  • Huaqiang Xiao,
  • Zhengwen Zhang

摘要

To address the escalating demand for high-temperature materials in aerospace hot-end components, this study examined scan speed, laser power, and scan rotation angle parameters to determine the effects of the powder bed fusion process on the mechanical properties of high temperature hard-to-weld K77 material. While the scan rotation angle was determined to be the parameter that most affected the microstructure, 67° scan rotation angle, 800 mm/s scan speed, and 180 W laser power were found to be the most suitable parameters to ensure the highest tensile strength. The tensile strength obtained in the verification test was measured at 1420.5 ± 39.45 MPa after heat-treatment. The findings increase the application potential of laser powder bed fusion (LPBF) technology with K77 material and provide valuable information for process optimization. The results can significantly contribute to strategies to increase tensile strength and improve material performance in industrial production processes.