About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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2020 Technical Division Student Poster Contest
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Presentation Title |
SPU-10: An In-situ X-ray Synchrotron Radiography Approach to Relating Melt-strategy Parameters to Solidification Dynamics in Laser Fusion Processing of Ti-6Al-4V |
Author(s) |
Logan White, Rakesh Kamath, Ryan Heldt , Yuan Li, Tao Sun, Sudarsanam Babu, Hahn Choo |
On-Site Speaker (Planned) |
Logan White |
Abstract Scope |
Defining a relationship between key processing parameters and resulting microstructure of fusion-based metal additive manufacturing will allow this process to be used to its fullest potential. A laser-AM simulator (developed in-house at beamline 32-ID-B, APS) was used in this study to probe the effects of line and spot melt strategies on the microstructure of Ti-6Al-4V with the controlling variables being: laser power, spot dwell time and laser scan speed. In-situ dynamic x-ray radiography was used to monitor the laser melting event in the AM-simulator and consequently, measure the liquid-solid interface velocity (V). Further, post-mortem microstructural characterization of the solidified melt-pools was used to indirectly estimate the thermal gradient across the liquid-solid interface (G). The G & V will be used to inform existing heat transfer models which, by providing a better understanding of the melt pool dynamics and resultant microstructure, will enable the elucidation of process-structure relationships in additive manufacturing.
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Proceedings Inclusion? |
Undecided |