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

Bermingham, M. J., Kent, D., Zhan, H., StJohn, D. H. and Dargusch, M. S. (2015) Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions. Acta Materialia, 91 289-303. doi:10.1016/j.actamat.2015.03.035


Author Bermingham, M. J.
Kent, D.
Zhan, H.
StJohn, D. H.
Dargusch, M. S.
Title Controlling the microstructure and properties of wire arc additive manufactured Ti–6Al–4V with trace boron additions
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2015-06-01
Sub-type Article (original research)
DOI 10.1016/j.actamat.2015.03.035
Volume 91
Start page 289
End page 303
Total pages 15
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Formatted abstract
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-α and colony-α, and instead produce a homogeneous α-microstructure consisting of fine equiaxed α-grains in both as-deposited and heat treated coupons. Prior-β 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.
Keyword Deposition
Grain refinement
Solidification microstructure
Titanium alloys
Mechanical properties
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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Created: Fri, 17 Apr 2015, 08:58:11 EST by Mr Michael Bermingham on behalf of School of Mechanical and Mining Engineering