About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
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Presentation Title |
Operando Synchrotron X-ray Diffraction Reveals Stages of Directional Solidification in Additive Manufacturing |
Author(s) |
Adrita Dass, Chenxi Tian, Darren C. Pagan, Atieh Moridi |
On-Site Speaker (Planned) |
Adrita Dass |
Abstract Scope |
Directional solidification is predominantly observed in additive manufacturing (AM) of Inconel 625 and is primarily dendritic, exhibiting distinct stages including: crystallite formation; bending and rotation; fragmentation and assimilation, intra- and inter-growth; and formation of secondary phases. Previously, synchrotron imaging has been used to study these phenomena, focusing on slower time scales and lighter Al- and Ti-based alloys that provide sufficient phase contrast. However, complete examination of these processes during metal AM has not been undertaken due to challenges of achieving sufficient temporal resolution and phase contrast due to fast solidification dynamics. Instead, our approach of using synchrotron x-ray diffraction alleviates some of these challenges and enables new understanding of the solidification dynamics during AM. Specifically, thermo-mechanical and microstructural information such as the evolution of lattice strain and crystallographic texture, not possible with other techniques, are measured in situ. Electron microscopy supports conclusions derived from the phenomena observed in situ. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Characterization |