Investigation Of The Dynamic Recovery And Recrystallization Of Near-Beta Titanium Alloy Ti-55511 During Two-Pass Hot Compression

The two-pass thermal compression behavior of near-beta Ti-55511 alloy was investigated. The first-pass restoration mechanisms changed from dynamic recrystallization (DRX) to dynamic recovery (DRV) as the first-pass deformation temperature increased from 700 degrees C to 850 degrees C. The occurrence of recrystallization reduced the dislocation density, resulting in a slower grain growth rate in the subsequent process. Because of the static recrystallization (SRX) and beta grain growth, the beta grain size increased and the morphology became less uniform during the subsequent beta holding process, which also changed the restoration mechanism during second-pass compression. The level of continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) become weaker during second-pass deformation. The changes in the restoration mechanism and the microstructures slightly increased the peak stress during the second-pass deformation.