|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
||Melt Pool Oscillations at Keyhole Transition as a Precursor to Pore-generating Turbulence
||Brian Simonds, Tao Sun, Saad Khairallah
|On-Site Speaker (Planned)
Detection of pore-generating events during additive manufacturing is the first step towards implementing feedback control for creating fully dense AM parts. Several researchers have successfully used high-speed synchrotron X-ray imaging to witness and describe these events but deploying this technology during actual AM builds is problematic. By combining ultrahigh-speed (25 MHz) light scattering methods with X-ray imaging, we have found that there is a regime of natural periodic melt pool fluctuations (25 – 60 kHz) that precedes pore-generating melt pool turbulence. High-fidelity multiphysics simulations were used to describe the mechanisms that drive these oscillations and found excellent quantitative agreement with respect to the measured frequency and absolute absorptance value. Light scattering presents a promising approach as a deployable platform for real-world AM build monitoring as it is easily capable of the very high detection rates necessary to observe these phenomena while also producing a readily processable one dimensional data stream.
||Additive Manufacturing, Modeling and Simulation,