About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Titanium Technology
|
Presentation Title |
Understanding the Effect of Process Variables on Melt Pool Dynamics and Solidification Kinetics during Laser Spot Melting of Ti-6Al-4V Alloy Using In-situ Dynamic Synchrotron X-ray Radiography |
Author(s) |
Rakesh R. Kamath, Raymond Wysmierski, Ryan Heldt, Logan White, Gerald Knapp, John Coleman, Samuel Reeve, Kamel Fezzaa, Hahn Choo |
On-Site Speaker (Planned) |
Rakesh R. Kamath |
Abstract Scope |
Key determinants in establishing the process-structure correlations in fusion-based additive manufacturing (AM) processes are the solid-liquid and liquid-vapor phase transformations. In-situ dynamic synchrotron x-ray imaging technique was used in tandem with a laser-AM simulator (beamline 32-ID-B, APS) to investigate the dynamics of the melt pool and vapor cavity during laser spot melting (and subsequent solidification) of Ti-6Al-4V alloy. The dynamics were mapped as a function of laser power and spot dwell time, spanning both the conduction and keyhole melting regimes. The velocity of the liquid-solid interface (R), a key physical variable which determines the solidification microstructure, was obtained from the analysis. Further, the melt pool dynamics was used to inform and improve melt pool simulations performed using additiveFOAM and PicassoMPM (Material Point Method). Experimental findings are supplemented with thermal gradient (G) and fluid flow results extracted from the above simulations to better understand microstructure formation in Ti-6Al-4V laser spot melts. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Modeling and Simulation |