| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
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| Presentation Title |
In Situ Synchrotron Observation of Directed Energy Deposition Additive Manufacturing Process |
| Author(s) |
Yunhui Chen, Samuel Clark, David M Collins, Sebastian Marussi, Thomas Connolley, Robert Atwood, Oxana V. Magdysyuk, Gavin Baxter, Martyn Jones, Chu Lun Alex Leung, Peter David Lee |
| 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 fast non-equilibrium solidification process during DED-AM is not easily measured with conventional methods. Through combined in situ synchrotron imaging and diffraction using a unique DED-AM process replicator implemented at a synchrotron beamline, we experimentally reveal the underlying mechanical and phase transformation behaviour which controls the build quality in IN718, a nickel based super-alloy widely used for safety critical components. Quantification of the solidification sequence was performed to reveal the residual stress development in a high temperature region is thermal dominant. The observed transformation behaviour during DED-AM newly relates the AM processing conditions to the eventual microstructures and properties. The results presented in this work provide an enhanced fundamental understanding of the DED-AM process with relevance to microstructure control in AM fabricated components. |
| Proceedings Inclusion? |
Planned: |