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<p>Interest in IN718/FGH96 dissimilar joints has grown in parallel with their practical engineering applications as critical components of high-temperature compressor rotors due to their exceptional high-temperature stability. Herein, inertia friction welding (IFW) with a novel designed post-weld heat treatment process was employed for fabricating high-strength IN718/FGH96 dissimilar joints, focusing on radial microstructural evolution and strengthening phase behaviors. Multi-scale characterization of the radial microstructure (inside, center, and outside regions) revealed that dynamic recrystallization and dissolution of strengthening phase in IFWed joints were governed by balancing severe heat input and air cooling. Complete dissolution of strengthening phases (γ′ phase, γ′′ phase, and δ phase) was occurred in the welding zone (WZ) and precipitated as secondary γ′ phase, secondary γ′′, tertiary γ′ phase after heat treatment. Thermo-mechanical affected zone (TMAZ) maintained high-dislocation density, since the dislocation formation induced by severe plastic deformation played a dominant role compared to dislocation consumption through dynamic recrystallization. The tensile strength of inside joint was 1402&#xa0;MPa with an elongation of 16%, while the center/outside joints reached 1450&#xa0;MPa and failed at the IN718 matrix. The major precipitates of the IFW joint after post-weld heat treatment at 750 and 700&#xa0;°C were for triple γ′ phase and secondary γ′′ phase. The inside joint fracture surfaces were macroscopically flat, indicating a brittle fracture. The outside/center joints exhibited a ductile fracture with fine dimples. This study highlighted the development of next-generation aero-engines using novel heterogeneous superalloys and reliable joining technique.</p>

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Radial microstructural uniformity in inertia friction welded IN718/FGH96 dissimilar joints with post-weld heat treatment

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Yutao Sun,
  • Qiang Zhao,
  • Zhiwei Qin,
  • Peng Li,
  • Jilong Wang,
  • Jiachen Li,
  • Tianyu Li,
  • Bin Wang,
  • Honggang Dong

摘要

Interest in IN718/FGH96 dissimilar joints has grown in parallel with their practical engineering applications as critical components of high-temperature compressor rotors due to their exceptional high-temperature stability. Herein, inertia friction welding (IFW) with a novel designed post-weld heat treatment process was employed for fabricating high-strength IN718/FGH96 dissimilar joints, focusing on radial microstructural evolution and strengthening phase behaviors. Multi-scale characterization of the radial microstructure (inside, center, and outside regions) revealed that dynamic recrystallization and dissolution of strengthening phase in IFWed joints were governed by balancing severe heat input and air cooling. Complete dissolution of strengthening phases (γ′ phase, γ′′ phase, and δ phase) was occurred in the welding zone (WZ) and precipitated as secondary γ′ phase, secondary γ′′, tertiary γ′ phase after heat treatment. Thermo-mechanical affected zone (TMAZ) maintained high-dislocation density, since the dislocation formation induced by severe plastic deformation played a dominant role compared to dislocation consumption through dynamic recrystallization. The tensile strength of inside joint was 1402 MPa with an elongation of 16%, while the center/outside joints reached 1450 MPa and failed at the IN718 matrix. The major precipitates of the IFW joint after post-weld heat treatment at 750 and 700 °C were for triple γ′ phase and secondary γ′′ phase. The inside joint fracture surfaces were macroscopically flat, indicating a brittle fracture. The outside/center joints exhibited a ductile fracture with fine dimples. This study highlighted the development of next-generation aero-engines using novel heterogeneous superalloys and reliable joining technique.