About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-30: In-situ X-ray Characterization of Keyhole Dynamics in Laser-based Additive Manufacturing of Aluminium Alloys |
Author(s) |
Hongze Wang, Yu Zou |
On-Site Speaker (Planned) |
Yu Zou |
Abstract Scope |
To reveal the role of the dynamic keyhole in laser manufacturing, we used the x-ray phase contrast method to observe the characteristics of the keyhole and molten pool when a stationary 140 μm diameter laser was irradiated to the surface of three representative aluminium alloys (A1050, A2024, and A5083). Violent fluctuation was observed in both the depth direction and the radial direction of the keyhole, and the non-uniform distribution of the metal vapor in the keyhole may account for this fluctuation. Two representative mechanisms for the bubble formation were observed, the first one was due to the fluctuation of the keyhole along the depth direction, and the second one was due to the fluctuation along the radial direction. This study concluded that the keyhole could appear first before the molten pool at some cases due to the fast evaporation of the solid metal. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |