|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||On the origin of the solidification texture in cubic alloys produced by laser powder bed fusion: Melt pool geometry versus local thermal gradients
||xiaogang wang, qingyang lu, Tan Phuc Le, Jude Emil Pascua Fronda, Matteo Seita
|On-Site Speaker (Planned)
Several recent studies have investigated the origins of the solidification texture in cubic metal alloys during laser powder bed fusion (LPBF). The general understanding is that melt pool geometry controls the orientation of the local thermal gradients, which, in turn, govern the directional growth of cells or dendrites and the resulting crystallographic texture. In this study, we employ our custom-made LPBF system to decouple melt pool geometry from local thermal gradients by changing laser beam diameter and local thermal buildup. Contrarily to what previously thought, we find that melt pool geometry has no significant role in the solidification texture. Rather, the magnitude of the local thermal buildup—which is a function of the scanning strategy used—dominates the resulting microstructure and crystallographic texture. Our results provide a solid foundation to produce cubic alloys with controlled crystallographic textures—including single-crystalline parts—using fusion-based additive manufacturing processes.
||Additive Manufacturing, Solidification, Solidification