|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
||Study of Solidification Behavior in Laser Additive Manufacturing Using Synchrotron X-ray Diffraction
||Adrita Dass, Atieh Moridi
|On-Site Speaker (Planned)
Understanding the dynamic solidification behavior during metal additive manufacturing (AM) is essential as it directly influences final microstructures, defects and therefore mechanical properties of the part. Novel in-operando x-ray experiments at different spatial and temporal resolutions provide an unprecedented opportunity to develop a new understanding of the underlying physics of the AM process and solidification in cooling rates applicable to beam-based AM. Here we demonstrate a novel approach using synchrotron x-ray diffraction to link the ‘mushy zone’ during solidification and solidification parameters for Inconel 625. Using this approach, we calculate the melt pool and mushy zone dimensions, along with real-time thermal gradient, cooling rate and solidification front velocity, all by virtue of tracking real-time changes in lattice parameters. We also estimate the dendritic arm spacings and the grain structure expected in the part. Results are corroborated with microscopy analysis of the printed structures.