About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
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Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
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| Presentation Title |
Deformation and Microstructure Development in DED-AM Structures via Dark Field X-ray Microscopy and In Situ Imaging |
| Author(s) |
Yunhui Chen, Yuanbo Tang, David Collins, Samuel Clark, Wolfgang Ludwig, Raquel Rodriguez-Lamaz, Carsten Detlefs, Roger Reed, Can Yildirim, Peter D. Lee, Philip Withers |
| On-Site Speaker (Planned) |
Yunhui Chen |
| Abstract Scope |
The mechanical performance of Directed Energy Deposition Additive Manufactured (DED-AM) components are highly process condition dependent due to rapid laser induced heating and cooling rates. However, the non-equilibrium solidification process and its resulting grain structure are not easily measured by conventional techniques. Here high angular resolution Dark Field X-ray Microscopy (DFXM) is used to quantify the DED-AM microstructure including the 3D distribution of strains, lattice misorientation and Geometrically Necessary Dislocations (GNDs) in a novel nickel base superalloy. Microstructure development is explored via solidification sequence modelling, which is calibrated by in situ synchrotron imaging of the manufacturing process in real time using a unique DED-AM process replicator. Strain and crystal orientation are found to be decoupled; with sub-grain orientations correlated to thermal gradients whereas high strains are homogeneously distributed. The results presented here provide an enhanced fundamental understanding of the DED-AM process with relevance to microstructure control in AM fabricated components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Copper / Nickel / Cobalt |