|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Understanding the influence of microstructure and voids during induced spall failure of additive manufactured stainless steel
||Josh Kacher, Katie Koube, Taylor Sloop, Kevin Lamb, Suresh Babu
|On-Site Speaker (Planned)
Additive manufactured stainless steel has a rich hierarchy of defect structures, including dense dislocation cell networks at the microscale, coarse and refined grain structures at the mesoscale, and void structures ranging from microns to millimeters. Multiple studies have focused on the influence of these defect structures on mechanical properties, though primarily under quasistatic loading conditions. In this study, we investigated the influence of microstructural features and intentional voids on spall initiation under high strain rate loading conditions. By varying the size and distribution of voids in the printed materials, we explored the relative importance of voids verses melt pool boundaries on spall initiation and dislocation accumulation. Post mortem, we used multiscale electron microscopy characterization, including high resolution electron backscatter diffraction and site specific transmission electron microscopy characterization, to characterize the defect structures accompanying spall initiation and crack propagation. Discussion will focus on the micro and mesoscale mechanisms dictating spall initiation.
||Additive Manufacturing, Characterization, Mechanical Properties