Confirmation of Rapid-Heating β Recrystallization in Wire-Arc Additively Manufactured Ti-6Al-4V

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The coarse columnar β grains in Ti-6Al-4V WAAM can be refined by relatively low strain inter-pass deformation. Simulation, with rapid heating, has shown this may partly occur by a novel recrystallization mechanism that involves twinning during β regrowth through the α-β transus, as a result of the prior deformation promoting faults in the α-β interface, which produces a unique micro-texture in each parent β grain. Here, this potential mechanism has been investigated further, using a different deformation mode – uniaxial tensile deformation rather than plane-strain compression – to enable the texture contribution from conventional recrystallization to be more unambiguously discriminated. The tensile-deformed samples are shown to produce the same unusual unique micro-texture seen previously, at low strains, despite the different deformation mode, but this disappeared at higher strains, which provides more evidence in support of this new rapid heating β recrystallization mechanism.
Original languageEnglish
Publication statusAccepted/In press - 31 Jul 2020


  • titanium
  • grain refining
  • plastic deformation
  • recrystallization texture
  • electron backscattering diffraction (EBSD)


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