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Improved ballistic performance of additively manufactured Ti6Al4V with α-β lamellar microstructures by Alexander E. Medvedev; Edward W. Lui; Darren Edwards; Martin Leary; Ma Qian; Milan Brandt is a Engineering article available to read on EtoBox.

What is Improved ballistic performance of additively manufactured Ti6Al4V with α-β lamellar microstructures about?

Titanium alloys are attractive lightweight alternatives to steels for armour applications. However, their ballistic performance remains much less understood than their conventional mechanical performance. This research correlates the microstructural features of the Ti6Al4V alloy manufactured by laser powder bed fusion (LPBF) in as-built and post-heat treated conditions to its mechanical behaviour at high strain rates (up to 10 3 s -1 ) as well as ballistic performance. The results obtained indicate that post-LPBF heat treatment or in-situ LPBF microstructural control is capable of producing Ti6Al4V plates with ballistic protection capabilities comparable to or exceeding the requirement of the wrought Ti6Al4V armour military specification as per MIL-DTL-46077G. This was achieved despite these Ti6Al4V alloy plate samples having a lamellar α-β microstructure structure, which is considered highly undesirable under high strain rate deformation. It is shown that the increased thickness of α-lamellae by post-LPBF heat treatment and their reorientation are potentially the key reasons that are responsible for their exceptional ductility and improved ballistic performance. Other microstructu

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Author

Alexander E. Medvedev; Edward W. Lui; Darren Edwards; Martin Leary; Ma Qian; Milan Brandt

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)