Comparison of microstructure refinement in wire-arc additively manufactured Ti–6Al–2Sn–4Zr–2Mo–0.1Si and Ti–6Al–4V built with inter-pass deformation

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dc.contributor.authorDavis, Alec E.
dc.contributor.authorCaballero Ramos, Armando
dc.contributor.authorBiswal, Romali
dc.contributor.authorWilliams, Stewart
dc.contributor.authorPrangnell, P. B.
dc.date.accessioned2022-09-29T12:19:53Z
dc.date.available2022-09-29T12:19:53Z
dc.date.issued2022-09-22
dc.description.abstractThe titanium alloy Ti–6Al–2Sn–4Zr–2Mo–0.1Si (Ti6242) has been deposited for the first time by a directed energy deposition process using a wire and arc system—i.e., wire-arc additive manufacturing (WAAM)—with and without inter-pass machine hammer peening, and its microstructure investigated and compared to the more commonly used alloy Ti–6Al–4V (Ti64). The application of inter-pass machine hammer peening—where each added layer was deformed before deposition—successfully refined the strongly textured, coarse, columnar β-grain structure that is commonly seen in α + β titanium alloys, producing a finer equiaxed grain structure with a near-random α texture. The average grain diameter and texture strength decreased with the peening pitch. When Ti6242 was deposited under identical conditions to Ti64, by switching the alloy feed wire in-situ, the refined β-grain size decreased across the alloy-to-alloy transition reaching on average 25 pct less in Ti6242 than in Ti64. A similar 25 pct scale reduction was also found in the Ti6242 α-lath transformation microstructure. This comparatively greater microstructure refinement in Ti6242 was attributed to the dissimilar alloying elements present in the two materials; specifically, molybdenum, which has a lower diffusivity than vanadium and led to slower β-grain growth during reheating as well as a finer transformation microstructure.en_UK
dc.description.sponsorshipEngineering and Physical Sciences Research Council (EPSRC): EP/R027218/1; EP/R001715/1.en_UK
dc.identifier.citationDavis AE, Caballero AE, Biswal R, et al., (2022) Comparison of microstructure refinement in wire-arc additively manufactured Ti–6Al–2Sn–4Zr–2Mo–0.1Si and Ti–6Al–4V built with inter-pass deformation, Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Volume 53, Issue 11, November 2022, pp. 3833–3852en_UK
dc.identifier.eissn1543-1940
dc.identifier.issn1073-5623
dc.identifier.urihttps://doi.org/10.1007/s11661-022-06811-1
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18494
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleComparison of microstructure refinement in wire-arc additively manufactured Ti–6Al–2Sn–4Zr–2Mo–0.1Si and Ti–6Al–4V built with inter-pass deformationen_UK
dc.typeArticleen_UK

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