About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Capturing Cracking during Blown Powder Additive Manufacturing Using Correlative Synchrotron X-ray and IR Imaging |
Author(s) |
David T. Rees, Tristan Fleming, Xianqiang Fan, Yuze Huang, Imogen Cowley, Sebastian Marussi, Robert Atwood, Martyn Jones, Ben Saunders, Cu Lun Alex Leung, Peter D. Lee |
On-Site Speaker (Planned) |
David T. Rees |
Abstract Scope |
Directed energy deposition (DED) of high gamma prime Ni-superalloys enables the fabrication and repair of complex safety-critical aerospace components. However, these materials are susceptible to hot cracking during DED due to extreme thermal gradients and fast solidification rates. The underlying mechanisms and strategies for cracking mitigation are unclear due to difficulties observing the problem as it occurs. Therefore, we used our bespoke DED process replicator to study the development of hot cracking, using high-speed synchrotron X-ray radiography and correlative infrared (IR) imaging. Our results show hot cracking in real time during DED of CM247LC and 718Plus, with cracking localized to seeded valleys in pre-built samples. We see when cracking occurs in relation to the number of layers built and the position of the molten pool, how crack propagation accelerates with subsequent processing, and the morphology of crack from initiation to completion of the build, along with the accompanying thermal history. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Solidification |