| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
Linking Melt Pool Temperature Distributions and History to Microstructure Development During Laser Engineered Net Shaping (LENS) Additive Manufacturing |
| Author(s) |
Minrak Kim, Patricia Weisensee, Katharine Flores |
| On-Site Speaker (Planned) |
Minrak Kim |
| Abstract Scope |
Melt pool (MP) dynamics determine the microstructural development in laser-based additive manufacturing (AM) processes. Temperature monitoring is vital to control the cooling rates and size of MPs. In this study, an in-situ thermal monitoring system using a multi-wavelength pyrometry was developed to study MP dynamics during Laser Engineered Net Shaping (LENS) AM. To achieve reliable temperature distributions of MPs, the monitoring process was optimized for Zr-based powder and substrate and an uncertainty analysis was conducted to ensure accurate measurements. Experiments were performed for various laser and powder processing parameters. After each experiment, the spatial distribution, composition and, and length scales of the solidified phases were analyzed. Transient MP temperature distributions and their history were correlated with the resultant microstructures to optimize LENS processes in terms of the phase-change heat transfer. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Other |