Tailoring the grain structure of IN718 during selective electron beam melting
1 University of Erlangen-Nuremberg, WTM, 91058 Erlangen, Germany
2 University of Erlangen-Nuremberg, ZMP, 90762 Fürth, Germany
a Corresponding author: firstname.lastname@example.org
Selective electron beam melting (SEBM) is an additive manufacturing method where complex parts are built from metal powders in layers of about 50 μm. SEBM works under vacuum conditions which results in a perfect protection of the metal alloy. The electron beam is used for heating (about 900 ∘C building temperature) and selective melting. The high beam velocities allow innovative scanning strategies in order to adapt the local solidification conditions which determine the epitaxial solidification process of IN718. We show how scanning strategies can be used either to produce a columnar grain structure with a high texture in building direction or a complete texture-free fine grained structure. Numerical simulations of the selective melting process are applied to reveal the fundamental mechanisms responsible for the completely different grain structures. In addition the influence of the different grain structures on the mechanical properties of IN718 is briefly discussed.
© Owned by the authors, published by EDP Sciences, 2014
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