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Improved ballistic performance of additively manufactured Ti6A14V with α-β lamellar microstructures

机译：改善了α-β层层组织的碱性制造的Ti6a14V的弹道性能

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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 Ti6A14V 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 Ti6A14V plates with ballistic protection capabilities comparable to or exceeding the requirement of the wrought Ti6A14V armour military specification as per MIL-DTL-46077G. This was achieved despite these Ti6A14V 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 microstructural factors with a positive effect on the ballistic performance include prior-p grain size as a function of the powder layer thickness as well as the stage of the in-situ martensitic decomposition, which defines the hardness of the microstructure.
机译：钛合金是可吸引人的轻质替代品，可用于铠装应用。然而，它们的弹道性能仍然不如传统的机械性能更易于理解。本研究将激光粉末融合（LPBF）制造的Ti6a14V合金的微观结构特征与高应变率高（高达10〜3 S〜（-1）的机械行为相关以及弹道表现。获得的结果表明，后LPBF热处理或原位LPBF微观结构控制能够产生具有与诸如MIL-DTL-46077G的锻造TI6A14V盔甲军事规范的弹道保护能力的Ti6a14V平板。尽管这些Ti6a14V合金板样品具有层状α-β微观结构结构的样品，但这是实现的，这在高应变速率变形下被认为是高度不希望的。结果表明，LPBF后热处理的α-薄膜厚度增加，其重新定位是可能的主要原因，这些主要延展性以及改善的弹道性能负责。对弹道性能具有积极影响的其他微结构因素包括作为粉末层厚度的函数的先前P粒度以及原位马氏体分解的阶段，其限定了微观结构的硬度。

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