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- Title
Enhancing Superplasticity of Ultrafine‐Grained Ti–6Al–4V without Imposing Severe Plastic Deformation.
- Authors
Kim, Daehwan; Won, Jong Woo; Park, Chan Hee; Hong, Jae Keun; Lee, Taekyung; Lee, Chong Soo
- Abstract
This study proposes a new regime of thermomechanical treatment composed of temperature‐decreasing step rolling (STEP) and subsequent annealing to fabricate ultrafine‐grained Ti–6Al–4V bulk plates with enhanced superplastic properties. This method utilizes fine martensites as an initial structure to assist in effective grain refinement even without imposing severe plastic deformation. The processed STEP alloys exhibit significant elongation of 706–856% at elevated temperatures. In particular, subsequent annealing at 600 °C induces superplasticity comparable to that obtained by high‐pressure torsion. This is attributed to the acceleration of continuous dynamic recrystallization. The developed thermomechanical process has the advantage of mass‐productivity in contrast to the existing SPD techniques. This article proposes a combination of temperature‐decreasing step rolling and subsequent annealing. The processed Ti–6Al–4V exhibits an ultrafine‐grained structure and superplasticity. The suggested method is beneficial for mass production in contrast to severe plastic deformation processes. The improvement arises from the acceleration of continuous dynamic recrystallization.
- Subjects
SUPERPLASTICITY; MATERIAL plasticity
- Publication
Advanced Engineering Materials, 2019, Vol 21, Issue 1, pN.PAG
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201800115