|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Harnessing Non Equilibrium Processing in Additive Manufacturing
||Kathryn Small, Markus Suddmans, Anna K. Rawlings, Ian McCue, Jaafar A. El-Awady, Mitra L. Taheri
|On-Site Speaker (Planned)
||Anna K. Rawlings
Laser-powder bed fusion (L-PBF) is an additive manufacturing (AM) technique that has gained popularity in recent years due to its potential for fast, low-waste manufacturing of complex components with narrow geometric tolerances. Its rapid solidification and fast cooling rates lead to microstructures that contain high residual stresses, anisotropic grain morphologies, intragranular misorientations, and unique, metastable dislocation cell structures. In addition to dislocation cell structures and residual stress variations, the grain and dendrite morphology in AM metals can differ based on the location within the build, owing to differences in number of remelting cycles and relative time at elevated temperature. This talk presents 1D geometries (e.g., single line traces) and 3D builds (e.g., cylinders) that show the impact of thermal environment and solidification pathway on the resulting microstructure. We reveal an increased microscale elastic strain level resulting from higher temperature gradients and faster cooling rates as well as a higher spatial correlation between elastic strain and dislocation density. These features have a direct impact on harnessing non-equilibrium structures.