About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
|
Presentation Title |
Leveraging In Situ Synchrotron Radiation Based Imaging to Understand the Impact of Laser Defocusing on Laser Powder Bed Fusion |
Author(s) |
Maureen Fitzpatrick, Samy Hocine, Marta Majkut, Ruben Lambert-Garcia, Elena Ruckh, Anna Getley, Kwan Kim, Wei Li, Chu Lun Alex Leung, Alexander Rack, Peter D Lee |
On-Site Speaker (Planned) |
Maureen Fitzpatrick |
Abstract Scope |
Synchrotron radiation imaging, owing to its high flux and excellent spatial resolution, has enabled observation of metallurgical solidification processes both in situ and ex situ. In this study, synchrotron-based imaging will be used to understand the effect of applied laser energy density in situ. Due to the rapid and unpredictable solidification rates associated with laser powder bed fusion (LPBF), ultra high speed synchrotron radiography enables revelations of meltpool behaviour and defect formation that cannot otherwise be unveiled. The effect of changing laser energy density (via manipulation of laser spot size, or defocusing) will be discussed in the context of reduced thermal gradients, better productivity, and impact on the microstructure. Radiography experiments were performed at the ESRF at beamline ID19, allowing for high spatial and temporal resolution (4µm pixel size and 40k frames per second) to accurately observe and quantify the LPBF process. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Titanium |