Study on constitutive relationship of TC21 titanium alloy with lamellar structure considering physical parameters [考虑物理参量的片层态TC21钛合金本构关系研究]

作者：Wan X.-C.; Ouyang D.-L.^*; Lu S.-Q.; Zhu H.-A.; Cui X.; Du H.-M.

来源：Journal of Plasticity Engineering, 2020, 27(12): 191-197.

DOI：10.3969/j.issn.1007-2012.2020.12.027

• Constitutive model
• Hot deformation
• Lamellar structure
• TC21 titanium alloy

The isothermal constant strain rate compression experiment of TC21 titanium alloy with lamellar structure was carried out at deformation temperature of 830-920 ℃ and strain rate of 0.001-1 s-1 by Gleeble-3500 thermal simulator. The high temperature deformation and plastic flow behavior of the alloy were analyzed, and the constitutive model introducing physical parameters (Young's modulus E and self-diffusion coefficient D) was constructed. The results show that the flow stress decreases with the increase of deformation temperature, and increases with the increase of strain rate. The flow stress curve shows obvious dynamic softening characteristic. The spheroidization phenomenon of lamellar structure occurs during hot deformation, and the softening feature of flow stress curve is caused by the occurence of spheroidization phenomenon of lamellar structure in alloy. The prediction accuracy of the established constitutive model of TC21 titanium alloy introducing physical parameters is high, the correlation coefficient R is 0.996, and the average relative error ARE is 6.18%.

• 单位
  南昌航空大学