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<p>This study comparatively investigates the microstructural evolution and tensile properties of a GH4096 superalloy ingot processed by conventional homogenization heat treatment (HT), hot pressing (HP), and novel hot oscillatory pressing (HOP). The results demonstrate that HOP is more effective in closing internal pores and refining interdendritic carbides than HT and HP. However, it also promotes coarsening of the secondary γ′ phase. This microstructural evolution resulted in a distinctive property profile: a significant increase in tensile ductility was achieved at the expense of yield strength. At 700&#xa0;°C, the HOP-processed sample exhibited an elongation of 25.3% with a yield strength of 443&#xa0;MPa, in contrast to 17.4% and 532&#xa0;MPa for the HT-treated, 19.6% and 533&#xa0;MPa for the HP-treated, and 15.6% and 562&#xa0;MPa for the as-cast condition. The markedly improved ductility, coupled with a reduced deformation resistance, confirms that HOP is a highly promising processing route for enhancing the hot forgeability of superalloy ingots.</p> Graphical Abstract <p></p>

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Enhanced Hot Forgability of Superalloy Ingot via Hot Oscillatory Pressing

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Qiang Zhou,
  • Dejian Sun,
  • Tianci Tao,
  • Yang Gao,
  • Lei Fan,
  • Fulin Li

摘要

This study comparatively investigates the microstructural evolution and tensile properties of a GH4096 superalloy ingot processed by conventional homogenization heat treatment (HT), hot pressing (HP), and novel hot oscillatory pressing (HOP). The results demonstrate that HOP is more effective in closing internal pores and refining interdendritic carbides than HT and HP. However, it also promotes coarsening of the secondary γ′ phase. This microstructural evolution resulted in a distinctive property profile: a significant increase in tensile ductility was achieved at the expense of yield strength. At 700 °C, the HOP-processed sample exhibited an elongation of 25.3% with a yield strength of 443 MPa, in contrast to 17.4% and 532 MPa for the HT-treated, 19.6% and 533 MPa for the HP-treated, and 15.6% and 562 MPa for the as-cast condition. The markedly improved ductility, coupled with a reduced deformation resistance, confirms that HOP is a highly promising processing route for enhancing the hot forgeability of superalloy ingots.

Graphical Abstract