Confirmation of rapid-heating β recrystallization in wire-arc additively manufactured Ti-6Al-4V

Date published

2020-08-13

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Elsevier

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Article

ISSN

2589-1529

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Citation

Davis AE, Caballero A, Prangnell PB. (2020) Confirmation of rapid-heating β recrystallization in wire-arc additively manufactured Ti-6Al-4V. Materialia, Volume 13, September 2020, Article number 100857

Abstract

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

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Github

Keywords

Electron backscattering diffraction (EBSD), Recrystallization texture, Plastic deformation, Grain refining, Titanium

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Attribution 4.0 International

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