The effect of β phase on microstructure and texture evolution during thermomechanical processing of α + β Ti alloy

D. G. Leo Prakash, P. Honniball, D. Rugg, P. J. Withers, J. Quinta Da Fonseca, M. Preuss

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52 Citations (Scopus)

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 languageEnglish
Pages (from-to)3200-3213
Number of pages14
JournalActa Materialia
Volume61
Issue number9
DOIs
Publication statusPublished - May 2013
Externally publishedYes

Keywords

  • Electron backscattered diffraction (EBSD)
  • Macrozones
  • Texture
  • Thermomechanical processing
  • Titanium alloys

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