About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-40: Elucidation of Solidification Kinetics in Laser Spot-fusion Processing of Ti-6Al-4V Alloy Using In-situ X-ray Synchrotron Radiography |
Author(s) |
Rakesh R. Kamath, Logan White, Ryan Heldt, Yuan Li, Tao Sun, Sudarsanam S. Babu, Hahn Choo |
On-Site Speaker (Planned) |
Rakesh R. Kamath |
Abstract Scope |
A thorough understanding of relationships between process parameters and final microstructure is of utmost importance to facilitate the utilization of fusion-based metal additive manufacturing (AM) technologies to their maximum. In this study, a laser-AM simulator (commissioned at beamline 32-ID-B, APS) was employed to examine the effects of spot melt strategies on liquid-solid and solid-solid transformations in Ti-6Al-4V alloy with varying parameters such as laser power, spot dwell time and intervals between successive spot melts. The aforementioned laser melting “events”, produced using the laser-AM simulator, were recorded using in-situ synchrotron x-ray radiography and were subsequently analyzed to obtain the liquid-solid interface velocity (V). Post-mortem EBSD characterization was used to indirectly estimate the thermal gradient (G) across the liquid-solid interface. In addition to throwing more light on liquid-solid transformations (using G & V), the effect on solid-solid transformations in the precursor melt due to the subsequent melt were studied using post-mortem EBSD. |
Proceedings Inclusion? |
Undecided |