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<p>A novel high-γ′ Ni-based superalloy designed for additive manufacturing (AM) was processed via laser directed energy deposition (L-DED) to investigate hot isostatic pressing (HIP)-induced microstructural evolution and mechanical enhancement. The as-built condition exhibited cellular dislocation networks with 0.062% residual porosity, achieving an exceptional yield strength (YS) of 1005 MPa and elongation of 20.2%. Post-HIP treatments at 1150 and 1190 °C effectively eliminated porosity (defect density reduced to ~ 0.02%), homogenized the microstructure, and promoted γ′-phase precipitation (342 nm at 1150 °C and 320 nm at 1190 °C) and recrystallization. These microstructural modifications enable retention of excellent strengths (UTS: 1462–1491 MPa, YS: 932–944 MPa) while enhancing ductility by 33%–40% (26.9%–28.3% elongation), outperforming conventional AM counterparts. The 1190°C HIP condition particularly demonstrated superior crack resistance through γ′ refinement and increased high-angle grain boundary (HAGB) density. Based on multi-scale characterization, quantitative models were developed for yield strength predictions, revealing a transition from dislocation-dominated hardening (as-built) to γ′-precipitation hardening (HIP-treated). This work establishes HIP as an essential post-processing protocol to circumvent the intrinsic strength–ductility conflict in additively manufactured superalloys for advanced aerospace applications.</p> Graphical abstract <p></p>

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Effects of hot isostatic pressing treatment on the microstructure and tensile properties of a novel high-γ′ Ni-based superalloy manufactured by laser directed energy deposition

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Wen-Tao Liu,
  • Yu-Yan Song,
  • Jing-Jing Ruan,
  • Chong-Chong Wu,
  • Xin Zhou,
  • Liang Jiang,
  • Li-Long Zhu

摘要

A novel high-γ′ Ni-based superalloy designed for additive manufacturing (AM) was processed via laser directed energy deposition (L-DED) to investigate hot isostatic pressing (HIP)-induced microstructural evolution and mechanical enhancement. The as-built condition exhibited cellular dislocation networks with 0.062% residual porosity, achieving an exceptional yield strength (YS) of 1005 MPa and elongation of 20.2%. Post-HIP treatments at 1150 and 1190 °C effectively eliminated porosity (defect density reduced to ~ 0.02%), homogenized the microstructure, and promoted γ′-phase precipitation (342 nm at 1150 °C and 320 nm at 1190 °C) and recrystallization. These microstructural modifications enable retention of excellent strengths (UTS: 1462–1491 MPa, YS: 932–944 MPa) while enhancing ductility by 33%–40% (26.9%–28.3% elongation), outperforming conventional AM counterparts. The 1190°C HIP condition particularly demonstrated superior crack resistance through γ′ refinement and increased high-angle grain boundary (HAGB) density. Based on multi-scale characterization, quantitative models were developed for yield strength predictions, revealing a transition from dislocation-dominated hardening (as-built) to γ′-precipitation hardening (HIP-treated). This work establishes HIP as an essential post-processing protocol to circumvent the intrinsic strength–ductility conflict in additively manufactured superalloys for advanced aerospace applications.

Graphical abstract