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<p>True stress–strain curve of GH5188 superalloys was achieved through hot compression experiment at 1025 ℃-1225 ℃ and 0.001 s⁻<sup>1</sup>–1 s⁻<sup>1</sup>. The constitutive equation of GH5188 was calculated by Arrehenius-type hyperbolic sine function, at the same time, main parameters of constitutive equation were calculated under different strain, predicted rheological stress and experimental values were compared. The conclusion revealed that 78.7% of data points had relative errors (RE) below 10%, while 14.5% of them fell within the 10%-20% range, indicating overall satisfactory predictive performance. The constitutive equation was used for the numerical simulation of diffusion bonding, and the obtained deformation of joints by simulation matched well with the experimental value.</p>

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Study on constitutive equation at hot deformation based on hot compression experiment of GH5188 superalloys

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Chunxi Yao,
  • Yunjia Huang,
  • Wei Guo,
  • Jingru Xin,
  • Yeming Guo

摘要

True stress–strain curve of GH5188 superalloys was achieved through hot compression experiment at 1025 ℃-1225 ℃ and 0.001 s⁻1–1 s⁻1. The constitutive equation of GH5188 was calculated by Arrehenius-type hyperbolic sine function, at the same time, main parameters of constitutive equation were calculated under different strain, predicted rheological stress and experimental values were compared. The conclusion revealed that 78.7% of data points had relative errors (RE) below 10%, while 14.5% of them fell within the 10%-20% range, indicating overall satisfactory predictive performance. The constitutive equation was used for the numerical simulation of diffusion bonding, and the obtained deformation of joints by simulation matched well with the experimental value.