About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Topology–Microstructure–Performance Linkages in LPBF Lattice Structures for Impact Energy Absorption |
| Author(s) |
Tomás Scuseria, Adriana Eres-Castellanos, Nathan Peterson, Omar Mireles, Jacob Mingear, John Bernardin, Amy Clarke |
| On-Site Speaker (Planned) |
Tomás Scuseria |
| Abstract Scope |
Laser powder bed fusion (LPBF) enables the fabrication of architected materials such as lattice structures, which have excellent specific energy absorption. Linking the effects of microstructure to mechanical performance across strain rate regimes in lattice structures remains a challenge. Here we produce 4340 steel monolithic and lattice structures to investigate the unique LPBF microstructure (e.g., martensite, bainite, and retained austenite) and its influence on properties across build geometries, orientations, and heights. Monolithic builds revealed location and geometry-dependent microstructural anisotropy and defects linked to melt pool dynamics and thermal gradients. Lattice structures with varying topologies (e.g., octet, body-centered cubic) and relative densities (10–40%) were similarly evaluated, in addition to heat-treated conditions and compression performance from quasi-static to high strain rate Kolsky-bar regimes. Microstructures and failure mechanisms in the lattices were compared to bulk monolithic counterparts to bridge the gap between design geometry and intrinsic material behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |