Authors
Sumit Gusain, Sarvesh Kumar Mishra, Amaia Calleja, Janakarajan Ramkumar, Luis Norberto Lopez de Lacalle
Publication date
2024/1/1
Journal
Procedia CIRP
Volume
123
Pages
464-469
Publisher
Elsevier
Description
The utilization of lattice structure in engineering components by additive manufacturing (AM) is gaining attention due to its lightweight design, high strength-to-weight ratio, and effective material utilization. Producing holes in additively manufactured lattice structures with dimensional accuracy is challenging. In the current study, we fabricate near circular through-holes on deterministic lattice structured components fabricated by laser powder bed fusion by utilizing electric discharge machining (EDM). In the additively manufactured Inconel 718 (IN718) lattice structure, nodes are connected by strut leaving voids/pores amongst different nodal points. Due to EDM, the nodes at the boundary of the hole experience concentration plasma interaction, heating, and rapid cooling, which causes a substantial change in the microstructure. The selective removal of material from different nodal positions causes uncharacteristic …