In situ observation of texture and microstructure evolution during rolling and globularization of Ti-6Al-4V
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractThe evolution of texture in β-annealed Ti-6Al-4V during α-β rolling and so-called recrystallization annealing has been examined using synchrotron X-ray diffraction and ex situ characterization. During rolling, the initial α (0 0 0 2) texture softens and the colony α becomes kinked. During globularization, the texture strengthens as highly strained (and hence misoriented) areas of the laths disappear and this strengthening continues once coarsening of the primary α becomes dominant. At shorter heat treatment times the αs laths that form on cooling do so with a range of variant-related orientations to the β, but at longer annealing times this αs takes on the orientation of the surrounding αp. The implications for the mechanical performance of macrozone-containing bimodal Ti-6Al-4V material are discussed. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
SponsorsThis work was funded by EPSRC under EP/E044700/1 and Rolls-Royce plc, with material generously supplied by Timet UK Ltd. The support and encouragement of David Rugg at Rolls-Royce plc is gratefully acknowledged. Matthew Peel, John Daniels and Thomas Bus laps at ID15, ESRF provided invaluable assistance in performing the diffraction experiments, as did Tony Rollett at CMU and John Kallend at IIT on the analysis of texture data.