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The effect of β phase on microstructure and texture evolution during thermomechanical processing of α+β Ti alloy
Acta Materialia, Volume: 61, Issue: 9, Pages: 3200 - 3213
Swansea University Author: Leo Prakash
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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 t...
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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.
This research is published in, the No.1 ranked journal in Metallurgy , Acta Materialia (5 year Impact factor: 4.395). For the first time, this clearly point out the critical role of high temperature beta phase on the development of different alpha phase texture and macrozones during thermomechanical processing of a technologically important metallic material (Ti-6Al-4V). These research findings are of particular practical consequences to Titanium and Aerospace industry as it demonstrates that certain hot rolling procedures might be applied to tailor texture. The importance of this publication is recognized by the UK industries, Timet (Matthew.Thomas@Timet.com) and Rolls-Royce (David.Rugg@rolls-royce.com).
Titanium alloys; Thermomechanical processing; Texture; Macrozones; Electron backscattered diffraction (EBSD)
College of Engineering