About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Feedstock Processing for Multifunctional Materials
|
| Presentation Title |
Joule-Thomson CO₂ Cooling for Wire Arc Additive Manufacturing (WAAM): Decoupling Productivity from Thermal Accumulation in ER70s-3 |
| Author(s) |
Mohammad Shahrukh Islam, Majid Haghshenas, Simos Gerasimidis, David Schmidt |
| On-Site Speaker (Planned) |
David Schmidt |
| Abstract Scope |
Wire Arc Additive Manufacturing (WAAM) faces a persistent trade-off between productivity and thermal control, as fixed interpass wait times cause heat accumulation or excessive build times. This study introduces active Joule-Thomson CO₂ cooling to decouple these factors in ER70S-3 steel. The Joule-Thomson effect produces -76°C gas with no refrigeration or moving parts. Four 35-layer walls were built: two under natural convection (120s, 200s waits) and two under CO₂ forced cooling (120s, 90s waits). Interpass temperature (IPT) and tensile properties were measured throughout. Results revealed a counterintuitive thermal hierarchy: Natural-120s exhibited the highest IPT, followed by CO₂-90s and CO₂-120s, with Natural-200s lowest — showing wait time alone does not govern IPT. Natural cooling produced higher tensile strength; CO₂-cooled walls showed a ~5% strength reduction with no loss in ductility. CO₂-90s achieved a 20% productivity gain over Natural-120s while maintaining lower IPT, demonstrating CO₂ cooling as a scalable strategy for high-throughput WAAM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Iron and Steel |