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<p>This study investigates the precipitation behavior of the <i>γ</i>' phase and the mechanical properties of a NiCoCrAlW nickel-based superalloy fabricated via powder metallurgy (P/M), with particular emphasis on the influence of heat-treatment parameters. Under optimized conditions comprising solution treatment at 1300&#xa0;°C for 3&#xa0;h followed by aging at 800&#xa0;°C for 8&#xa0;h, the alloy exhibits a fine average grain size of 4.95&#xa0;μm, an ultimate tensile strength of 1345&#xa0;MPa, an elongation to fracture of 20.3%, and a hardness of 439.6 HV. The synergistic enhancement of strength and ductility is primarily attributed to three microstructural factors: (i) improved recrystallization during solution treatment, (ii) refined size, optimized morphology, and homogeneous distribution of the <i>γ</i>' precipitates, and (iii) effective suppression of deleterious coarse phases. These findings elucidate the critical role of heat-treatment temperature in governing microstructural evolution of nickel-based superalloys, thereby providing theoretical underpinning and practical guidance for the design and application of high-temperature alloys.</p>

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The effect of heat treatment on microstructure evolution and mechanical properties of NiCoCrAlW superalloy

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Ziyi Zhou,
  • Yapeng Li,
  • Taotao Wang,
  • Zhongni Liao,
  • Chao Lian,
  • Hui Zhang

摘要

This study investigates the precipitation behavior of the γ' phase and the mechanical properties of a NiCoCrAlW nickel-based superalloy fabricated via powder metallurgy (P/M), with particular emphasis on the influence of heat-treatment parameters. Under optimized conditions comprising solution treatment at 1300 °C for 3 h followed by aging at 800 °C for 8 h, the alloy exhibits a fine average grain size of 4.95 μm, an ultimate tensile strength of 1345 MPa, an elongation to fracture of 20.3%, and a hardness of 439.6 HV. The synergistic enhancement of strength and ductility is primarily attributed to three microstructural factors: (i) improved recrystallization during solution treatment, (ii) refined size, optimized morphology, and homogeneous distribution of the γ' precipitates, and (iii) effective suppression of deleterious coarse phases. These findings elucidate the critical role of heat-treatment temperature in governing microstructural evolution of nickel-based superalloys, thereby providing theoretical underpinning and practical guidance for the design and application of high-temperature alloys.