|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Mechanical Response of “Meta-Polycrystalline” Steel 316L Produced by Laser Powder Bed Fusion
||Karl Sofinowski, Mallory Wittwer, Matteo Seita
|On-Site Speaker (Planned)
Additive manufacturing has made it possible to create materials with site-specific microstructures down to the micron scale. This new paradigm enables the design of advanced metal alloys with tailored mechanical properties and improved performance. Here, we use laser powder bed fusion to produce samples of stainless steel 316L with site-specific crystallographic textures by manipulating the local solidification conditions across the build. We use this strategy to design samples of quasi-single crystal blocks with controlled shape, size, an orientation. These “meta-polycrystals” can mimic grain-scale structures such as curved grain boundaries, twin boundaries, and triple junctions. We perform various mechanical tests on the meta-polycrystals to probe the effect of the interface misorientation and curvature on the deformation. Using in situ digital image correlation and directional reflectance microscopy, we measure the strain evolution and crystallographic rotation of these structures. We then compare the mechanical response against that of single crystals and polycrystals.
||Additive Manufacturing, Mechanical Properties, Iron and Steel