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<p>Wide-gap brazing (WGB) is an economically efficient and widely adopted technique for repairing superalloy components. However, controlling the formation of detrimental brittle intermetallic phases remains challenging even with optimized filler materials and brazing parameters. This study systematically investigates the effect of introducing hot isostatic pressing (HIP) as an intermediate process on the microstructure and mechanical properties of layered WGB CM247LC superalloy joints. Combining X-ray computed tomography (XCT), microstructural characterization, and mechanical testing, the results demonstrate that HIP treatment effectively eliminated internal porosity and reduced the void volume fraction from approximately 0.2% to 0.002%. Furthermore, HIP promoted boron diffusion, significantly reduced the amount and continuity of brittle boride phases. Mechanical tests confirmed that these microstructural improvements led to a remarkable enhancement in joint performance, including a 12-fold increase in stress rupture life at 900&#xa0;°C/315&#xa0;MPa and a 24% improvement in tensile strength. The findings underscore HIP’s critical role in achieving high-integrity repairs for wide-gap brazed superalloy joints.</p>

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Effect of hot isostatic pressing on the microstructure and mechanical properties of wide-gap brazed joints

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Jie Liu,
  • Mingsheng Wang,
  • Xiangwei Jiang,
  • Zishu Sun,
  • Song Zhang,
  • De Wang,
  • Chunhua Zhang,
  • Jiasheng Dong

摘要

Wide-gap brazing (WGB) is an economically efficient and widely adopted technique for repairing superalloy components. However, controlling the formation of detrimental brittle intermetallic phases remains challenging even with optimized filler materials and brazing parameters. This study systematically investigates the effect of introducing hot isostatic pressing (HIP) as an intermediate process on the microstructure and mechanical properties of layered WGB CM247LC superalloy joints. Combining X-ray computed tomography (XCT), microstructural characterization, and mechanical testing, the results demonstrate that HIP treatment effectively eliminated internal porosity and reduced the void volume fraction from approximately 0.2% to 0.002%. Furthermore, HIP promoted boron diffusion, significantly reduced the amount and continuity of brittle boride phases. Mechanical tests confirmed that these microstructural improvements led to a remarkable enhancement in joint performance, including a 12-fold increase in stress rupture life at 900 °C/315 MPa and a 24% improvement in tensile strength. The findings underscore HIP’s critical role in achieving high-integrity repairs for wide-gap brazed superalloy joints.