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In order to investigate the effect of dynamic recrystallization (DRX) behavior on dynamic softening behavior of wrought Ti-10V-2Fe-3Al titanium alloy, a series of laboratory scale isothermal hot compression tests with a height reduction of 60% were performed in a temperature range of 948 K~1023 K in the ( σ  +  β ) phase field, and a strain rate range of 0.01~10 s −1  on a Gleeble-3500 thermo-mechanical simulator. The flow curves show a continuous softening at all strain rate after peak stress. The constitutive equation and the DRX kinetic mold were established to study the dynamic softening based on the flow curves. By the regression analysis for conventional hyperbolic sine equation, the activation energy was determined as  Q  = 479.4169 kJ·mol −1 , According to the strain hardening rate curves (d σ /d ε  versus  σ ), two characteristic parameters including the critical strain for DRX initiation ( ε  c ) and the strain for peak stress ( ε  p ) were identified, and the linear dependence of the critical strain ( ε  c ) for DRX initiation on the strain for peak stress ( ε  p ) can be specified by the equation:  ε  c  = 0.5667 ε  p . A modified Avrami type equationX   D  R  X    =  1  -    e  x  p  [   -   β  d   (    ε  -   ε  cε   0  .  5)      k  d   ]    $${X_{DRX}} = 1 - exp[{\rm{-}}{\beta _{\rm{d}}}({{\varepsilon {\rm{-}}{\varepsilon _{\rm{c}}}} \over {{\varepsilon _{0.5}}}}){\rm{}}{k_d}]$$    was introduced to characterize the evolution of DRX volume fraction. The evolution of DRX volume was described as the following: for a fixed strain rate, the strain required for the same amount of DRX volume fraction increases with decreasing deformation temperature, in contrast, for a fixed temperature, it increases with increasing strain rate. Finally, the impact of dynamic recrystallized behavior on degree of dynamic softening became weaker and weaker with the increasing of temperature for the strain rate of 0.01 s −1 , 0.1 s −1 , 1 s −1  and 10 s −1 , due to the volume of  α  phase decreased with the increasing of temperature.

Quantitative Analysis of Dynamic Softening Behaviors Induced by Dynamic Recrystallization for Ti-10V-2Fe-2Al Alloy