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Rasch, Michael; Heberle, Johannes; Dechet, Maximilian A; Bartels, Dominic; Gotterbarm, Martin R; Klein, Lukas; Gorunov, Andrey; Schmidt, Jochen; Körner, Carolin; Peukert, Wolfgang; Schmidt, Michael
Materials, 12/2019, Letnik: 13, Številka: 1Journal Article
Powder Bed Fusion with Laser Beam of Metals (PBF-LB/M) is one of the fastest growing technology branches. More and more metallic alloys are being qualified, but processing of aluminum wrought alloys without cracks and defects is still challenging. It has already been shown that small parts with low residual porosity can be produced. However, suffering from microscopic hot cracks, the fracture behavior has been rather brittle. In this paper different combinations of temperature gradients and solidification rates are used to achieve specific solidification conditions in order to influence the resulting microstructure, as well as internal stresses. By this approach it could be shown that EN AW-2024, an aluminum-copper wrought alloy, is processable via PBF-LB/M fully dense and crack-free with outstanding material properties, exceeding those reported for commonly manufactured EN AW-2024 after T4 heat treatment.
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