About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Field-Assisted Material Processing and Solidification
|
| Presentation Title |
High-speed X-ray imaging of melt pool flow modification in IN718 and SS316L during magnetic field assisted directed energy deposition |
| Author(s) |
Xiao Shang, Harry E. Chapman, Ivars Krastins, Xianqiang Fan, Soumya S. Dash, Robert C. Atwood, Andrew Kao, Peter D. Lee, Yu Zou |
| On-Site Speaker (Planned) |
Xiao Shang |
| Abstract Scope |
Magnetic fields offer a promising route to control melt pool flow in directed energy deposition (DED). However, how the materials respond to an applied field, and why their responses differ, remains poorly understood. Here we examine the influence of a magnetic field on two of the most common DED materials, IN718 and SS316L, through direct in-situ X-ray imaging of melt pool flow dynamics. By interchanging powder and substrate materials, we isolate their contributions and reveal distinct responses: when printing SS316L, on either IN718 or SS316L, it exhibits a weak thermoelectric magnetohydrodynamic (TEMHD) force, whereas printing IN718 exhibits a strong TEMHD force. We hypothesise that the solid/liquid Seebeck coefficient difference, i.e., the Seebeck power, governs this behaviour, with IN718 melt pools exhibiting greater Seebeck power than SS316L. Microstructural analysis and simulation support this mechanism, identifying material Seebeck power selection as a key design lever. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Process Technology, Other |