About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
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Presentation Title |
Porosity Formation, Evolution, and Solidification in Powder-blown Directed Energy Deposition Additive Manufacturing Using High-speed Synchrotron X-ray Imaging |
Author(s) |
Sarah J. Wolff, Hui Wang, Mahsa Valizadeh, Marwan Haddad, Benjamin Gould |
On-Site Speaker (Planned) |
Sarah J. Wolff |
Abstract Scope |
The laser-based powder-blown directed energy deposition (L-DED) additive manufacturing process is promising for its fabrication of complex, multi-material metallic parts with superior mechanical parts for a wide range of applications. However, porosity in L-DED parts is common due to rapid solidification, and can pose obstacles in deteriorating mechanical properties, and therefore part qualification and certification. This talk will discuss some of the fundamental interactions between in-flight powder particles and the underlying melt pool that lead to porosity in the L-DED process. High-speed synchrotron X-ray imaging (up to 80,000 fps) experiments at the 32-ID beamline at the Advanced Photon Source in Argonne National Laboratory show porosity mechanisms that originate from feedstock powders, laser attenuation during deposition, the interplay between the kinetic and surface energies during deposition, as well as particle characteristics of shape, size, and chemical composition. In addition, preliminary machine learning training methods can identify porosity in X-ray images. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Process Technology |