About this Abstract |
Meeting |
2020 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
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Presentation Title |
Simultaneous High-speed Measurements of Laser Absorptance and Melt Pool Geometry in Metal Powder Bed Systems |
Author(s) |
Brian Simonds, Jack Tanner, Paul Williams, Niranjan Parab, Cang Zhao, Tao Sun |
On-Site Speaker (Planned) |
Brian Simonds |
Abstract Scope |
During the metal powder bed fusion additive manufacturing process, the intense laser-metal interaction dramatically and rapidly changes the built surface, which in turn alters the amount of laser energy absorbed locally. These transient changes in energy deposition can lead to the formation of defects including porosity and cracking. In this work, we measured the absolute absorbed laser energy using an integrating sphere while simultaneously imaging the melt pool and keyhole evolution using synchrotron high-speed x-ray imaging. These measurements were performed on both titanium and aluminum alloys with the experimental conditions incrementally increased in complexity from a stationary laser spot on solid metal to a scanning laser beam incident to a metal powder bed. This is the first experimental work that simultaneously correlates the effects of specific melt pool geometries, like vapor cavity shape and collapse, with the amount of laser energy absorbed. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |