Abstract
Microstructure and texture evolution have been investigated in both α and β phases during the hot rolling of β-quenched Ti-6Al-4V at 800 and 950 °C, followed by annealing at 950 °C and air cooling using detailed electron backscattered diffraction mapping. The textures of primary and secondary α in the bi-modal microstructure were analysed separately, and the high-temperature β orientations were calculated by a variant based reconstruction from the inherited αs orientations. Crystal plasticity finite element modelling has been employed to predict the rolling texture based on common α phase slip systems and compare with the measured α texture. It was found that despite the severe deformation during rolling, a large proportion of the primary α grains retain a Burgers relationship with the β phase. Consequently, the β phase in combination with a variant selection mechanism seems to control the α texture, which explains the discrepancy between predicted and measured rolling textures. The consequence of this mechanism for macrozone formation is also discussed.
Original language | English |
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Pages (from-to) | 3200-3213 |
Number of pages | 14 |
Journal | Acta Materialia |
Volume | 61 |
Issue number | 9 |
DOIs | |
Publication status | Published - May 2013 |
Externally published | Yes |
Keywords
- Electron backscattered diffraction (EBSD)
- Macrozones
- Texture
- Thermomechanical processing
- Titanium alloys