Advanced process strategy to realize microducts free of powder using selective electron beam melting
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Selective electron beam melting (SEBM) is a powder bed–based additive manufacturing (AM) technology and allows the fabrication of complex metal components. However, the high building temperatures necessary for a stable process prohibit the fabrication of small internal features and intended cavities, e.g., for cooling purposes and heat exchangers. In this work, a novel scan strategy is used to seal prefabricated notches on the surface of Ti-6Al-4V substrates and to create microducts without applying additional materials. Influencing factors are identified and a process map for the SEBM sealing process is established. The impact of the determined strategy on the material properties regarding surface structure and composition is investigated. This sealing process can be followed by conventional SEBM-based additive manufacturing to build complex structures on the sealing layer due to its high flatness.
KeywordsAdditive manufacturing Selective electron beam melting Microducts Surface repairing
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Furthermore, the authors wish to thank Mr. Rudi Borchard from the University of Erlangen-Nuremberg for the generation of V-notches in Ti-6Al-4V plates using laser ablation.
Financial support from the Deutsche Forschungsgemeinschaft (DFG, German research foundation) within the Collaborative Research Centre 814, Additive Manufacturing (subproject B2), is gratefully acknowledged.
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