The role of dynamic and post dynamic recrystallization on microstructure refinement in primary working of a coarse grained two-phase titanium alloy

Dynamic and post dynamic recrystallization in primary working of a coarse grained two-phase TA15 titanium alloy were investigated. It is found that in β deformation, dynamic recrystallization (DRX) can be triggered at a low strain. The low nucleation rate retards DRX. It is prone to producing a duplex grain structure. During post-deformation holding, both meta-dynamic recrystallization (MDRX) and static recrystallization (SRX) occur. The average recrystallized grain size increases sharply in the early stage of holding due to MDRX but varies slightly after SRX occurs. Post dynamic recrystallization can be finished in a short time and additional β annealing after deformation is unnecessary. Refining the initial structure can accelerate recrystallization and decrease the recrystallized grain size.