About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-24: Effect of Laser-matter Interaction on Molten Pool Flow and Keyhole Dynamics |
Author(s) |
Nadia Kouraytem, Xuxiao Li, Ross Cunningham, Cang Zhao, Niranjan Parab, Tao Sun, Anthony D. Rollett, Ashley D. Spear, Wenda Tan |
On-Site Speaker (Planned) |
Nadia Kouraytem |
Abstract Scope |
The dynamics of laser-induced keyholes, pertaining to laser-based additive manufacturing, are not fully understood. In this study, the state-of-the-art dynamic x-ray radiography (DXR) technique is used to observe, in-situ, laser-induced keyholes for a combination of laser powers and scanning speeds in SS304. The observations from DXR are used to populate a processing map of keyhole morphology for SS304. A multiphase, multiphysics numerical model is then used to predict keyhole morphology and is subsequently validated using the experimentally observed keyhole morphologies and fluctuation. After validation, the simulation results are further leveraged to elucidate the details of both the formation and dynamics of laser-induced keyholes. Particularly, three typical morphologies of keyholes are discussed in terms of laser-matter interaction (specifically, the spatial distribution and temporal variation of laser absorption), thermofluidic flow, keyhole-wall motion, and major competing forces. The combination of experimental and modeling techniques provides a powerful, unprecedented tool for elucidating keyhole dynamics. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |