| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
|
| Presentation Title |
In-situ Characterization of Laser Powder Bed Fusion Processes at the Stanford Synchrotron Light Source |
| Author(s) |
Kevin Stone |
| On-Site Speaker (Planned) |
Kevin Stone |
| Abstract Scope |
Laser powder bed fusion (LPBF) is a method of additive manufacturing where a high powered laser is scanned over a thin bed of metallic powder creating a solid layer, this is then repeated to form larger structures. Much of the melting, resolidification, and subsequent cooling take place at much higher rates and with much higher thermal gradients than in traditional metallurgical processes, with much of this occurring below the surface. Using high speed X-ray characterization at SSRL, we nondestructively probe the dynamics of melting and resolidification during LPBF. With high speed X-ray imaging, we observe the vapor depression and potential void formation. Using high speed in-situ X-ray diffraction, we are able to track phase transformations, determine subsurface cooling rates, and distinguish between the melted and nearby heat affected zones on millisecond time scales. These results provide a direct measure of the subsurface thermal history. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Titanium |