About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
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Presentation Title |
Visualization and Analysis in Additive Manufacturing |
Author(s) |
Anthony D. Rollett |
On-Site Speaker (Planned) |
Anthony D. Rollett |
Abstract Scope |
Additive manufacturing is multiscale. In laser powder bed fusion (LPBF), millions of microscopic weld tracks build parts over hours. High-speed visualization of the melting process with synchrotron x-rays is a prime example of “seeing is believing” because it has revealed near omnipresence of vapor holes and the many different ways that defects can be introduced into printed parts. The details of the melt pools also need metallography and orientation mapping to reveal subtle variations of melt pool shape. Simulation of microstructure development imparts an understanding of the evolution and its sensitivity to processing details. High speed diffraction experiments, again with synchrotron x-rays, reveals unexpected aspects of phase evolution that are complemented by microscopy to reveal microsegregation despite the high cooling rates. Deeper analysis reveals multiple precipitation sequences in alloy 718, surprising variations in lattice parameters in Ti-6Al-4V, and competition between ferrite and austenite in stainless steels. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |