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<p>In order to investigate the high-temperature deformation behavior of BT25y titanium alloy with initial equiaxed structure, isothermal compression test was performed on the Gleeble-1500 thermo-mechanical simulator. The stress–strain curves within deformation temperatures of 880 ~ 1020&#xa0;°C and strain rates of 0.001 ~ 10&#xa0;s<sup>−1</sup> were obtained. The microstructure evolution of BT25y alloy during hot deformation was studied, and results show that increasing the deformation temperature or strain rate can effectively promote the occurrence of dynamic recrystallization. Then the variation laws of strain hardening exponent <i>n</i>, strain rate sensitivity exponent <i>m</i> and temperature sensitivity exponent <i>s</i> with respect to different deformation parameters were derived. Finally, the constitutive relationship was established by utilizing the double multiple nonlinear regression (DMNR) approach, which exhibits high prediction accuracy with a correlation coefficient (<i>R</i>) of 0.995 and an average absolute relative error (<i>AARE</i>) of 6.32%. These findings effectively characterize the dynamic response of flow behavior to the hot deformation parameters and provide a solid theoretical foundation for the optimization of hot deformation processes.</p>

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Quantitative Analysis of the High-Temperature Flow Behavior for BT25y Titanium Alloy with Initial Equiaxed Structure Based on the DMNR Model

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Xuemei Yang,
  • Jiayuan Wang,
  • Xiaonan Shi,
  • Xuewei Yan,
  • Jinhui Zhao

摘要

In order to investigate the high-temperature deformation behavior of BT25y titanium alloy with initial equiaxed structure, isothermal compression test was performed on the Gleeble-1500 thermo-mechanical simulator. The stress–strain curves within deformation temperatures of 880 ~ 1020 °C and strain rates of 0.001 ~ 10 s−1 were obtained. The microstructure evolution of BT25y alloy during hot deformation was studied, and results show that increasing the deformation temperature or strain rate can effectively promote the occurrence of dynamic recrystallization. Then the variation laws of strain hardening exponent n, strain rate sensitivity exponent m and temperature sensitivity exponent s with respect to different deformation parameters were derived. Finally, the constitutive relationship was established by utilizing the double multiple nonlinear regression (DMNR) approach, which exhibits high prediction accuracy with a correlation coefficient (R) of 0.995 and an average absolute relative error (AARE) of 6.32%. These findings effectively characterize the dynamic response of flow behavior to the hot deformation parameters and provide a solid theoretical foundation for the optimization of hot deformation processes.