Grain refinement of wire arc additively manufactured titanium by the addition of silicon

Mereddy, S., Bermingham, M. J., StJohn, D. H. and Dargusch, M. S. (2017) Grain refinement of wire arc additively manufactured titanium by the addition of silicon. Journal of Alloys and Compounds, 695 2097-2103. doi:10.1016/j.jallcom.2016.11.049

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Author Mereddy, S.
Bermingham, M. J.
StJohn, D. H.
Dargusch, M. S.
Title Grain refinement of wire arc additively manufactured titanium by the addition of silicon
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
Publication date 2017-02-25
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2016.11.049
Open Access Status File (Author Post-print)
Volume 695
Start page 2097
End page 2103
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract This study demonstrates that silicon additions are effective in refining the microstructure of additive layer manufactured (ALM) titanium components. The addition of up to 0.75 wt% silicon to commercially pure titanium manufactured by wire arc ALM results in a significant reduction of the prior-β grain size. It is observed that silicon also reduces the width of the columnar grains and allows for the nucleation of some equiaxed grains through the development of constitutional supercooling and growth restriction. The grain size of the ALM components is compared to a casting process and it is found that the as-deposited microstructure produced during ALM exhibits larger average grain sizes. Using the Interdependence model for predicting grain size, it was determined that the population of nucleant particles that naturally occur in titanium, has comparable potency (i.e. ability to activate at a similar undercooling) regardless of the processing method, however, the ALM process contains fewer, sufficiently potent, nucleant particles than for the casting process due to the effect of subsequent cycles of remelting and heating.
Keyword Additive manufacturing
Grain refinement
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DE160100260
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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