Effects of the microstructure and porosity on properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)

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• 作者：Haize Galarraga^a ; ^{haize.galarraga@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Diana A. Lados^a ; Ryan R. Dehoff^b ; ^c ; Michael M. Kirka^b ; ^c ; Peeyush Nandwana^b ; ^c
• 关键词：Additive manufacturing ; Electron beam melting ; Titanium ; Porosity ; Properties
• 刊名：Additive Manufacturing
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：10
• 期：Complete
• 页码：47-57
• 全文大小：5097 K

文摘

Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that makes possible the fabrication of three-dimensional near-net-shaped parts directly from computer models. EBM technology has been continuously evolving, optimizing the properties and the microstructure of the as-fabricated alloys. Ti-6Al-4V ELI (Extra Low Interstitials) titanium alloy is the most widely used and studied alloy for this technology and is the focus of this work. Several research works have been completed to study the mechanisms of microstructure formation, evolution, and its subsequent influence on mechanical properties of the alloy. However, the relationship is not completely understood, and more systematic research work is necessary in order to attain a better understanding of these features. In this work, samples fabricated at different locations, orientations, and distances from the build platform have been characterized, studying the relationship of these variables with the resulting material intrinsic characteristics and properties (surface topography, microstructure, porosity, micro-hardness and static mechanical properties). This study has revealed that porosity is the main factor controlling mechanical properties relative to the other studied variables. Therefore, in future process development, decreasing the porosity should be considered the primary goal in order to improve mechanical properties.