Tailoring the grain structure of IN718 during selective electron beam melting

By Carolin Körner, Harald Helmer, A. Bauereiß, R. Singer. 2014

163 citations recorded by the source corpus.

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.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/4ab46a0c2497a9dfb13486dd0a61d3b7630e6865

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Citations in the corpus

Additive manufacturing of metallic components by selective electron beam melting — a review (2016, background): “As a result, SEBM samples very often show a strong texture combined with anisotropic properties.(25,32,33) Grains with favourable orientation overgrow unfavourable oriented ones.”
Metal Alloys for Fusion‐Based Additive Manufacturing (2018, background): “Körner et al.[124] have also demonstrated the impact of scanning strategy on the grain structure of EBMed Inconel 718.”
Finite interface dissipation phase field modeling of Ni–Nb under additive manufacturing conditions (2019, unknown): “[17] studied the equiaxed and columnar”
Numerical modeling of heat-transfer and the influence of process parameters on tailoring the grain morphology of IN718 in electron beam additive manufacturing ☆ (2016, unknown): “[9] shown the possibility of obtaining both epitaxial and near equiaxed grains in different layers by varying the scan strategy and beam parameters between the layers.”
Microstructure modelling for metallic additive manufacturing: a review (2020, background): “It is shown that changing the parameters and scanning strategy can result in tailored microstructure (Körner et al. 2014; Parimi et al. 2014; Dehoff et al. 2015; Wei, Mazumder, and DebRoy 2015; Raghavan et al. 2016).”