About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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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 |