| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Ultrafine Grain Formation and Mechanical Properties in Commercial Pure Titanium Through Thermomechanical Processing Near β Transus Temperature |
| Author(s) |
Hyung-Won Park, Kyunghyun Kim, Hyeon-Woo Park, Yuki Shimomura, Taichi Kitajima, Jun Yanagimoto |
| On-Site Speaker (Planned) |
Hyung-Won Park |
| Abstract Scope |
Thermomechanical controlled processing (TMCP) of commercial pure (CP) titanium was performed at deformation temperatures ranging from 700–1000°C, a strain rate of 1 /s, and a 70% height reduction to investigate the flow stress behavior and formation of ultrafine grains (UFGs) by focusing on the effects of strain-induced dynamic transformation (SIDT) and dynamic recrystallization (DRX) near the β transus. The flow stress at 0.2 strain decreased drastically from 96 to 25 MPa when the deformation temperature increased from 800 to 900°C. Equiaxed UFGs with a grain size of 2–4 um formed in this temperature range. The primary mechanisms of grain refinement were DRX at 800°C and a combination of DRX and SIDT (β→α) at 900°C. From a 90° V-bending test, the grain refinement achieved by the TMCP at 700°C increased the force, and the retained β phases within the 1000°C TMCP-treated specimen increased the springback amount. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Shaping and Forming, Phase Transformations |