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The Co-based superalloys are extensively utilized in aerospace applications due to their exceptional thermal strength and resistance to high-temperature corrosion. This study focuses on deformation behavior of a novel Co-based alloy ingots produced through vacuum induction and electroslag remelting. The hot compression experiments were used a Gleeble − 3800 experimental machine. A constitutive equation characterizing the alloy’s behavior was derived from experimental data analysis; notably, the activation energy for hot deformation was determined to be 391 kJ/mol. The interrelationship among deformation temperature, strain rate, and flow stress can be encapsulated by the following constitutive equation: \(\dot{\upvarepsilon }=1.07\times {10}^{13}{[\text{sinh}(249\upsigma )]}^{2.62}\text{exp}[-391000/(\text{RT})]\) . Furthermore, this constitutive equation illustrates the dynamic equilibrium between work hardening and recrystallization softening processes while allowing observation of microstructural changes in the alloy post-high-temperature compression treatment. Enhancing recrystallization within the alloy can be achieved by either reducing strain rates or elevating deformation temperatures.

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Hot Deformation and Recrystallization Behavior of a Novel Co-Based Superalloy

  • 会议论文

  • 发表日期：

    2025年

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  • Fuzai Guo,
  • Wen Chen,
  • Leipeng Xie,
  • Yingli Zhao,
  • Chengming Wang,
  • Lijun Liu,
  • Mengxian Li,
  • Zhen Zhang

摘要

The Co-based superalloys are extensively utilized in aerospace applications due to their exceptional thermal strength and resistance to high-temperature corrosion. This study focuses on deformation behavior of a novel Co-based alloy ingots produced through vacuum induction and electroslag remelting. The hot compression experiments were used a Gleeble − 3800 experimental machine. A constitutive equation characterizing the alloy’s behavior was derived from experimental data analysis; notably, the activation energy for hot deformation was determined to be 391 kJ/mol. The interrelationship among deformation temperature, strain rate, and flow stress can be encapsulated by the following constitutive equation: \(\dot{\upvarepsilon }=1.07\times {10}^{13}{[\text{sinh}(249\upsigma )]}^{2.62}\text{exp}[-391000/(\text{RT})]\) . Furthermore, this constitutive equation illustrates the dynamic equilibrium between work hardening and recrystallization softening processes while allowing observation of microstructural changes in the alloy post-high-temperature compression treatment. Enhancing recrystallization within the alloy can be achieved by either reducing strain rates or elevating deformation temperatures.