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<p>A powder metallurgy nickel-based superalloy VV751P (Ni-10(Al,Ti,Nb)− 34.5(Co,Cr,Mo,W,V,Hf)− 0.057(C,B), wt.%) is currently employed in some gas turbine engines. However, the mechanical properties of this superalloy in the hot isostatically pressed (HIPed) and heat-treated condition do not always meet the demanding requirements of advanced gas turbine engines. In this work, the as-received VV751P superalloy was subjected to hot forging and solid solution treatment at subsolvus temperatures (approximately 15-40&#xa0;°C below the <i>γ</i>′ solvus temperature) in order to eliminate prior particle boundary precipitates and refine the initial microstructure by recrystallization. To enhance recrystallization efficiency, the effect of the initial microstructure on the development of recrystallization was studied. Coarse <i>γ</i>′ phase and serrated grain boundaries were found to promote dynamic recrystallization, whereas pronounced initial dislocation substructure showed no discernible effect. Discontinuous dynamic recrystallization was identified as the dominant recrystallization mechanism. Based on the findings, fine-grained forgings were produced and subsequently subjected to various solution treatments and the same aging. Hot forging led to appreciable improvement in hardness, tensile properties, and creep rupture life at 650&#xa0;°C/1078&#xa0;MPa and 750&#xa0;°C/620&#xa0;MPa. This was reached due to eliminating prior particle boundaries, forming a refined microstructure (<i>d</i><sub><i>γ</i></sub> = 8-18&#xa0;µm) and finely dispersed precipitates of the secondary γ′-phase.</p>

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Effect of Forging and Heat Treatment on Microstructure and Mechanical Properties of a PM Nickel-Based Superalloy

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Rishat Zainullin,
  • Shamil Mukhtarov,
  • Ruslan Shakhov,
  • Artem Ganeev,
  • Valery Imayev

摘要

A powder metallurgy nickel-based superalloy VV751P (Ni-10(Al,Ti,Nb)− 34.5(Co,Cr,Mo,W,V,Hf)− 0.057(C,B), wt.%) is currently employed in some gas turbine engines. However, the mechanical properties of this superalloy in the hot isostatically pressed (HIPed) and heat-treated condition do not always meet the demanding requirements of advanced gas turbine engines. In this work, the as-received VV751P superalloy was subjected to hot forging and solid solution treatment at subsolvus temperatures (approximately 15-40 °C below the γ′ solvus temperature) in order to eliminate prior particle boundary precipitates and refine the initial microstructure by recrystallization. To enhance recrystallization efficiency, the effect of the initial microstructure on the development of recrystallization was studied. Coarse γ′ phase and serrated grain boundaries were found to promote dynamic recrystallization, whereas pronounced initial dislocation substructure showed no discernible effect. Discontinuous dynamic recrystallization was identified as the dominant recrystallization mechanism. Based on the findings, fine-grained forgings were produced and subsequently subjected to various solution treatments and the same aging. Hot forging led to appreciable improvement in hardness, tensile properties, and creep rupture life at 650 °C/1078 MPa and 750 °C/620 MPa. This was reached due to eliminating prior particle boundaries, forming a refined microstructure (dγ = 8-18 µm) and finely dispersed precipitates of the secondary γ′-phase.