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<p>The disk-blade assembly in aero-engine traditionally relies on dowel teeth/ dovetail groove joints, which exhibits numerous limitations. The laser melting deposition (LMD) offers a promising alternative for near-net-shape fabrication of monolithic blisk. In this work, three homogeneous samples (75%GH4169 + 25%K477, 50%GH4169 + 50%K477, 25%GH4169 + 75%K477, in wt.%) and GH4169/K477 gradient samples were prepared by LMD. Their microstructures and room/high-temperature mechanical properties were systematically investigated before and after post-processing procedures of heat treatment (HT), hot isostatic pressing (HIP) and HIP + HT. The results revealed that the microstructures of untreated samples with three composition ratios were columnar dendrites. With the decrease of GH4169 content, the grain size increased from nearly 150&#xa0;μm to 250&#xa0;μm. After HIP and HIP + HT, the microstructure changed to equiaxed grains and the strength improved significantly while the plasticity declined marginally. For gradient samples, their microstructures at different regions in untreated state were similar, which were columnar dendrites. After post-processing, the columnar dendrites became equiaxed grains and the strength was greatly improved. The tensile property of HIP + HT-treated samples was optimal, with a maximum ultimate tensile strength of 1298&#xa0;MPa and a maximum yield strength of 882&#xa0;MPa, simultaneously a maximum elongation of 22.8%.</p>

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Regulation of Microstructure and Room/High-Temperature Mechanical Properties of Laser Melting Deposition GH4169/K477 Gradient Material by Heat Treatment and Hot Isostatic Pressing

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Han Wang,
  • Wenkang Ji,
  • Cheng Wang,
  • Ruize Xiong,
  • Cenya Zhao,
  • Wei Liu,
  • Yang Zheng

摘要

The disk-blade assembly in aero-engine traditionally relies on dowel teeth/ dovetail groove joints, which exhibits numerous limitations. The laser melting deposition (LMD) offers a promising alternative for near-net-shape fabrication of monolithic blisk. In this work, three homogeneous samples (75%GH4169 + 25%K477, 50%GH4169 + 50%K477, 25%GH4169 + 75%K477, in wt.%) and GH4169/K477 gradient samples were prepared by LMD. Their microstructures and room/high-temperature mechanical properties were systematically investigated before and after post-processing procedures of heat treatment (HT), hot isostatic pressing (HIP) and HIP + HT. The results revealed that the microstructures of untreated samples with three composition ratios were columnar dendrites. With the decrease of GH4169 content, the grain size increased from nearly 150 μm to 250 μm. After HIP and HIP + HT, the microstructure changed to equiaxed grains and the strength improved significantly while the plasticity declined marginally. For gradient samples, their microstructures at different regions in untreated state were similar, which were columnar dendrites. After post-processing, the columnar dendrites became equiaxed grains and the strength was greatly improved. The tensile property of HIP + HT-treated samples was optimal, with a maximum ultimate tensile strength of 1298 MPa and a maximum yield strength of 882 MPa, simultaneously a maximum elongation of 22.8%.