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5158 |
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Wednesday, March 22, 2017, Hall Ford 3:55 PM Additive Manufacturing II |
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Additive manufacturing by electron beam melting from powder to component |
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Burghardt Klöden / Fraunhofer IFAM, Germany Alexander Kirchner* / Fraunhofer IFAM, Germany Thomas Weißgärber/ Fraunhofer IFAM, Germany Bernd Kieback/ Fraunhofer IFAM, Germany Michael Süß/ TU Dresden, KTC, Germany Christine Schöne/ TU Dresden, KTC, Ralph Stelzer/ TU Dresden, KTC, |
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Processing of metals by additive manufacturing has gained significant interest in the past 3-4 years. This is manifested by an increasing number of installed machines and available materials. One of these technologies, Electron Beam Melting (EBM), will be focused on in this presentation. Like Laser Beam Melting (LBM) it is a powder-bed-fusion technology by which three-dimensional complex parts can be manufactured in a layer-wise manner. The source of energy is an electron beam with a maximum power of 3 kW. EBM is a high-temperature process, i.e., each powder layer is pre-heated to a material-specific temperature prior to melting (these temperatures are in the range of ca. 700°C for Ti-6Al-4V and > 1000°C for e.g. titanium aluminides). After a short introduction into the process, aspects concerning the powder will be highlighted with the focus on powder assessment and how this relates to processability in the EBM process. The second case study will be about process development of a Ti-based alloy. In this part, process parameters and their influence on material properties will be explained. As a result of the process development a processing window is obtained, which is material-specific and will be explained in the presentation. In a third case study, manufacturing of an aerospace part by EBM will be presented. This includes design aspects (i.e. topology optimization was done with the conventional part in order to optimize the mass distribution) as well as details on manufacturing and after-treatment. |