Process parameter sensitivity of the energy absorbing properties of additively manufactured metallic cellular materials

Additive Manufacturing (AM) has enabled the fabrication of metallic cellular materials that are interest in design lightweight impact resistant structures. However, there is a need to understand interactions between: (i) material architecture, (ii) AM process parameters, and (iii) as-built geometry, microstructure energy absorbing properties. In this work, we investigate quasi-static dynamic behaviour manufactured from 316L stainless steel using laser powder bed fusion (LPBF). Four architectures considered (octet lattice, lattice-walled square honeycomb, origami honeycomb), as well three sets characterised by powers 50, 125 200 W. The exposure time adjusted deliver same total heat input. W case leads with highest strength ductility. variant match their nominal densities most closely, have absorption. Either reducing (50 W) or increasing (200 power significant increase porosity, find changes due process-induced porosity smaller influence than those resulting choice architecture.