Investigation of the Dynamic Recovery and Recrystallization of Near-β Titanium Alloy Ti-55511 during Two-Pass Hot Compression

• Published in: Metals (Basel ) 2021-02, Vol.11 (2), p.359
• Main Authors: Wang, Hande, Ge, Jinyang, Zhang, Xiaoyong, Chen, Chao, Zhou, Kechao
• Format: Article
• Language: English
• Subjects: continuous dynamic recrystallization (CDRX); Deformation; discontinuous dynamic recrystallization (DDRX); Dislocation density; dynamic recovery (DRV); Dynamic recrystallization; Grain boundaries; Grain growth; Grain size; Hot pressing; Influence; Mechanical properties; Microstructure; Morphology; near-β titanium alloy; Recovery; Restoration; Titanium alloys; Titanium base alloys; two-pass hot compression
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met11020359

The two-pass thermal compression behavior of near-β 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 °C to 850 °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 β grain growth, the β grain size increased and the morphology became less uniform during the subsequent β 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.