| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Synchrotron X-ray Hierarchical Imaging of Phase Transformations during Laser Additive Manufacturing |
| Author(s) |
Yunhui Chen, Artjom Bolender, David Collins, Carsten Detlefs, Alexander Rack, Veijo Honkimaki, Peter Lee, Philip Withers, Mark Easton, Alexander Liehr, Thomas Niendorf |
| On-Site Speaker (Planned) |
Yunhui Chen |
| Abstract Scope |
The pinnacle of Additive Manufacturing is to manipulate microstructures to create functionally graded mechanical properties. Metastable austenitic steels shine new light on this pathway. Here, a hierarchical and correlative Synchrotron X-ray imaging approach is adopted to establish a well-rounded picture of the material behavior in situ. The approach starts with high-speed synchrotron radiography, which enables both real and, reciprocal space quantification of the laser-matter interaction, including phase evolution during the build process. High angular resolution Dark Field X-ray Microscopy (DFXM) was adopted to focus on the grain and sub-grain level structures, spatially resolving strain distribution, lattice misorientation, and Geometrically Necessary Dislocations within a single grain in 3D during the phase transformation using in situ thermal cycling, revealing the key kinetics for phase transformation control. The results presented here provide new insights into the LAM process with relevance to microstructure control in AM fabricated components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Other |