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Meeting MS&T23: Materials Science & Technology
Symposium Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
Presentation Title High-speed Synchrotron X-ray Imaging of Microstructural Refinement Mechanisms During Ultrasonic Melt Processing in Metal Additive Manufacturing
Author(s) Lovejoy Mutswatiwa, Lauren Katch, Nathan Kizer, Tao Sun, Samuel J. Clark, Kamel Fezzaa, Christopher M. Kube
On-Site Speaker (Planned) Lovejoy Mutswatiwa
Abstract Scope Refined, equiaxed grain structure and improved mechanical properties are benefits of ultrasonic melt processing when applied during solidification in metal additive manufacturing (AM). However, the influence of ultrasonic vibrations on many of the solidification and microstructural refinement mechanisms in laser AM remain unknown. This presentation will focus on dynamics of laser-generated melt pools on an Al6061 sample sonicated at 20.2 kHz. The resulting melt pool behavior was captured using high-speed synchrotron X-ray imaging at the Advanced Photon Source. An X-ray image acquisition rate of 50 kHz allowed direct observation of cavitation bubbles in an opaque and viscous molten metal pool confined within microscale geometry. Furthermore, ultrasonic treatment reduced the solidification rate and caused pore migration toward the melt pool surface. These observations support the hypothesis that cavitation occurs when ultrasonic melt processing is used in laser AM and further facilitate continued investigation into the influence of cavitation on grain refinement.


Effects of Heat Treatment under External Magnetic Field on Microstructure and Mechanical Properties of Ferritic/Martensitic Steels
Effects on Aluminum Alloys During Heat Treatment in a Magnetic Field
High-speed Synchrotron X-ray Imaging of Microstructural Refinement Mechanisms During Ultrasonic Melt Processing in Metal Additive Manufacturing
Inhibition of Biofilm Formation on Glass Specimens when Subjected to AC Electromagnetic Fields of 20 kHz to 30 kHz
Microstructure Evolution and Property Enhancement of 3D-printed Graphene via Cold Rolling
Microwave Sintering for Lunar Base Construction
Microwave Synthesis of Cobalt Ferrite-reduced Graphene Oxide Composites
N-6: Improving Reliability of Ultrasonic Fatigue Testing through Comparative Analysis of Conventional and Ultrasonic Fatigue Tests on SS400 Material
N-7: Research on Green Laser Welding Process and Monitoring Technologies for Manufacturing Parts of Electric Vehicles
Post-processing of Irradiated FeCrAl by Electron Wind Force
Reviewing a Unified Phenomenological Comprehension on Non-thermal Effects in Microwave-assisted Materials Processing
The Role and Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles During High Frequency Microwave Processing
Ultrasonic Vibration Acoustic Softening Effect on AISI 1018 Low-Carbon Steel

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