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 |
Correlation of Melt Strategy Parameters to Solidification Variables During Laser Fusion Processing of Ti-6Al-4V Alloy: An In-situ Dynamic Synchrotron X-ray Radiography Study |
Author(s) |
Rakesh R. Kamath, Yuan Li, Tao Sun, Sudarsanam Suresh Babu, Hahn Choo |
On-Site Speaker (Planned) |
Rakesh R. Kamath |
Abstract Scope |
The capability to tailor microstructural properties is critical in realizing the full potential of fusion-based metal additive manufacturing (AM) technologies; therefore, necessitating a correlation of process parameters to key physical variables governing solidification microstructure. In the present study, a laser-AM simulator (developed at beamline 32-ID-B, APS) was used to investigate effects of spot and line melt strategies on Ti-6Al-4V alloy microstructure as a function of key parameters namely laser power, line scan speed, spot dwell time and interval between successive spot melts. In-situ dynamic synchrotron x-ray radiography was used in tandem with the laser-AM simulator to obtain the liquid-solid interface velocity (V) of the liquid-solid interface. An indirect estimation of the thermal gradient across the liquid-solid interface (G) was performed using post-mortem microstructural characterization. The G & V were used to develop a heat transfer model to provide basic understanding of the development of melt pool geometry and solidification microstructure. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |