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

Journal Article · Fri Jan 01 00:00:00 EST 2016 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2016.02.003· OSTI ID:1240567

Galarraga, Haize ^[1]; Lados, Diana A. ^[1]; Dehoff, Ryan R. ^[2]; Kirka, Michael M. ^[2]; Nandwana, Peeyush ^[2]

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1. Worcester Polytechnic Institute, Worcester, MA (United States). Integrative Materials Design Center
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility

Electron Beam Melting (EBM) is a metal powder bed-based Additive Manufacturing (AM) technology that makes possible the fabrication of three dimensional near-net-shaped parts directly from computer models. EBM technology has been in continuously updating, obtaining optimized properties of the processed alloys. Ti-6Al-4V 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 as well as its influence on mechanical properties. 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 developments, decreasing of the porosity should be considered as the primary goal in order to improve mechanical properties.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1240567
• Alternate ID(s): OSTI ID: 1346576
• Journal Information: Additive Manufacturing, Vol. 10, Issue C; ISSN 2214-8604
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE