About this Abstract |
Meeting |
2024 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 III
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Presentation Title |
Controlling Melt Pool Dynamics during Additive Manufacturing Using External Forces |
Author(s) |
Xianqiang Fan, Tristan Fleming, Samul J. Clark, Kai Zhang, Harry Chapman, Sebastian Marussi, Chu Lun Alex Leung, Robert C. Atwood, Andrew Kao, Peter D. Lee |
On-Site Speaker (Planned) |
Xianqiang Fan |
Abstract Scope |
Melt pool dynamics during additive manufacturing (AM) greatly determine the built quality of AM products. Applying external fields, such as a magnetic field or ultrasound, introduces forces into the melt pool, altering the melt pool dynamics and potentially minimising porosity which is a major concern in AM. However, the mechanisms by which these external forces alter flow remains unclear, hindering their further application. Here, we demonstrated the mitigation of the keyhole pores through the application of a magnetic field. We reveal new insights into the underlying mechanisms using high-speed synchrotron X-ray imaging. We found that the effect of the magnetic field on keyhole pore formation is scanning direction dependent. In one scanning direction, the keyhole was stabilised, causing reduced keyhole porosity. Scanning in the opposite direction, the keyhole was destabilised, leading to increased keyhole porosity. These observations are attributed to the thermoelectric effect occurring in the melt pool. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Characterization |