Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions

M J Bermingham; Damon Kent; H Zhan; D H StJohn; M S Dargusch

doi:10.1016/j.actamat.2015.03.035

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Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions

Journal article

Peer reviewed

Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions

M J Bermingham, Damon Kent, H Zhan, D H StJohn and M S Dargusch

Acta Materialia, Vol.91, pp.289-303

2015

DOI: https://doi.org/10.1016/j.actamat.2015.03.035

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Abstract

deposition

grain refinement

solidification microstructure

titanium alloys

mechanical properties

This study demonstrates that trace boron addition to Ti-6Al-4V coupons produced by additive layer manufacturing is an effective way to eliminate the deleterious anisotropic microstructures often encountered with this manufacturing technique. Trace boron additions (up to 0.13 wt.%) to this alloy eliminate grain boundary-a and colony-a, and instead produce a homogeneous a-microstructure consisting of fine equiaxed a-grains in both as-deposited and heat treated coupons. Prior-b grains remain columnar with boron addition but become narrower due to the wider solidification range and growth restricting effect of the boron solute. Compared to unmodified Ti-6Al-4V alloy, Ti-6Al-4V modified with trace boron additions showed up to 40% improvement in plasticity with no loss in strength under uniaxial compression at room temperature. Boron additions were found to inhibit twinning transmission that causes sudden large load drops during deformation of the unmodified Ti-6Al-4V alloy in the heat treated condition.

Details

Title: Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions
Authors: M J Bermingham (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
H Zhan (Author) - University of Queensland
D H StJohn (Author) - University of Queensland
M S Dargusch (Author) - University of Queensland
Publication details: Acta Materialia, Vol.91, pp.289-303
Publisher: Pergamon
Date published: 2015
DOI: 10.1016/j.actamat.2015.03.035
ISSN: 1359-6454
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449258002621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

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