Scholarlink

<p>Prior particle boundaries (PPBs), critical metallurgical defects in powder metallurgy superalloys, severely degrade interfacial bonding and mechanical properties. This study employs hot oscillatory forging (HOF) to regulate PPBs, grains and γ′ phases in FGH4096 alloy between 1050–1140&#xa0;°C. With increasing HOF temperature, the enhanced interparticle bonding strength directly increased the room-temperature tensile elongation from 16.3 to 29.5% and shifted the dominant fracture mechanism from interparticle to transparticle mode. Concurrently, alongside progressive grain coarsening (average size: 17.28 → 31.20&#xa0;μm), the non-monotonic variations in intragranular strain (kernel average misorientation: 16°→24°→9°) and γ′ phase volume fraction (30.9% →34.4% →32.3%), which first increased and then decreased, correspondingly led to an initial rise and subsequent decline in the room-temperature tensile yield strength from 935&#xa0;MPa to a peak of 952&#xa0;MPa before decreasing to 801&#xa0;MPa. The optimal comprehensive room-temperature tensile properties (yield strength: 952&#xa0;MPa, elongation: 29.5%) were achieved at the HOF temperature of 1080&#xa0;°C, markedly superior to those of conventional hot-forged samples (905 MPa, 22.8%) under identical thermomechanical conditions. This enhancement is attributed to the oscillatory pressure-induced improvement in interparticle bonding strength and strain hardening.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of hot oscillatory forging temperature on microstructure and tensile properties of a powder metallurgy superalloy

  • 期刊论文

  • 发表日期：

    2026年1月2日

查看全文
  • Linfei Guo,
  • Dejian Sun,
  • Qiang Zhou,
  • Xuewei Yan,
  • Yang Gao,
  • Lei Fan,
  • Fulin Li

摘要

Prior particle boundaries (PPBs), critical metallurgical defects in powder metallurgy superalloys, severely degrade interfacial bonding and mechanical properties. This study employs hot oscillatory forging (HOF) to regulate PPBs, grains and γ′ phases in FGH4096 alloy between 1050–1140 °C. With increasing HOF temperature, the enhanced interparticle bonding strength directly increased the room-temperature tensile elongation from 16.3 to 29.5% and shifted the dominant fracture mechanism from interparticle to transparticle mode. Concurrently, alongside progressive grain coarsening (average size: 17.28 → 31.20 μm), the non-monotonic variations in intragranular strain (kernel average misorientation: 16°→24°→9°) and γ′ phase volume fraction (30.9% →34.4% →32.3%), which first increased and then decreased, correspondingly led to an initial rise and subsequent decline in the room-temperature tensile yield strength from 935 MPa to a peak of 952 MPa before decreasing to 801 MPa. The optimal comprehensive room-temperature tensile properties (yield strength: 952 MPa, elongation: 29.5%) were achieved at the HOF temperature of 1080 °C, markedly superior to those of conventional hot-forged samples (905 MPa, 22.8%) under identical thermomechanical conditions. This enhancement is attributed to the oscillatory pressure-induced improvement in interparticle bonding strength and strain hardening.