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<p>This study systematically compares the effects of SHT and HIP on the microstructure and mechanical properties of LPBF GH5188 superalloy. The results demonstrate the clear superiority of the HIP process. It increased the microhardness by approximately 15% and resulted in an excellent room-temperature tensile strength of 1025&#xa0;MPa combined with 49% elongation. At an elevated temperature of 1000&#xa0;°C, HIP treatment enhanced the tensile strength by 12%, dramatically improved the elongation from 23.8 to 43.6%, and increased the high-temperature durability by 83%. Microstructural analysis via 3D CT revealed that HIP effectively reduces internal porosity and transforms continuous grain boundary carbide films into isolated, discrete particles. This microstructural refinement promotes Orowan strengthening within the γ matrix and mitigates grain boundary embrittlement, thereby significantly improving high-temperature fracture resistance and oxidation stability. This work provides a crucial foundation for optimizing the post-processing of LPBF GH5188 for critical acro-engine components such as turbine blades.</p> Graphical abstract <p></p>

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The effects of heat treatments on the defect characteristics and high-temperature performances of laser powder bed fused GH5188 superalloy

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Jiaoxi Yang,
  • Yujin Tian,
  • F. Gao,
  • Wenliang Wu,
  • Zhengbo Yan,
  • Wenyu Bo,
  • Jiantao Liu

摘要

This study systematically compares the effects of SHT and HIP on the microstructure and mechanical properties of LPBF GH5188 superalloy. The results demonstrate the clear superiority of the HIP process. It increased the microhardness by approximately 15% and resulted in an excellent room-temperature tensile strength of 1025 MPa combined with 49% elongation. At an elevated temperature of 1000 °C, HIP treatment enhanced the tensile strength by 12%, dramatically improved the elongation from 23.8 to 43.6%, and increased the high-temperature durability by 83%. Microstructural analysis via 3D CT revealed that HIP effectively reduces internal porosity and transforms continuous grain boundary carbide films into isolated, discrete particles. This microstructural refinement promotes Orowan strengthening within the γ matrix and mitigates grain boundary embrittlement, thereby significantly improving high-temperature fracture resistance and oxidation stability. This work provides a crucial foundation for optimizing the post-processing of LPBF GH5188 for critical acro-engine components such as turbine blades.

Graphical abstract