About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Beyond the Beam III
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Presentation Title |
In Situ Observation of Melt Pool in Ultrasonic Vibration-assisted Directed Energy Deposition |
Author(s) |
Salma A. El-Azab, Aleksandra L. Vyatskikh, Sen Jiang, Cheng Zhang, Lorenzo Valdevit, Enrique J. Lavernia, Julie M. Schoenung |
On-Site Speaker (Planned) |
Salma A. El-Azab |
Abstract Scope |
Despite the advantages of additive manufacturing (AM), defects such as porosity are common in AM-fabricated metal parts. It is therefore critical to adopt techniques that mitigate defects and provide uniform microstructures, improving the mechanical properties of metal AM parts. In arc welding and casting, ultrasonic vibration (UV) has been shown to decrease porosity, promote formation of equiaxed microstructures, and enhance hardness and strength. In this work, we apply in situ UV to directed energy deposition (DED) of metals. To analyze microstructure, porosity, and chemical composition, we employ scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). Additionally, we utilize in situ high-speed video and thermal imaging of the melt pool surface to elucidate the mechanisms governing UV-assisted DED (UV-A DED) during deposition of stainless steel. Our analysis of the high-speed video suggests that UV widens the melt pool and impacts particle-melt pool interactions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, |