| About this Abstract |
| Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Symposium
|
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Presentation Title |
Unveiling Gas–Liquid Metal Reactions in Metal Additive Manufacturing: High-Fidelity Modeling Validated with Experiments |
| Author(s) |
Hou Yi Chia, Yanming Zhang, Lu Wang, Wentao Yan |
| On-Site Speaker (Planned) |
Hou Yi Chia |
| Abstract Scope |
Gases such as oxygen inevitably react with the melt pool during metal additive manufacturing (AM). Excessive uncontrolled oxidation is detrimental, so most machines purge the chamber with inert gases, minimizing but not eliminating such reactions. Alternatively, some users exploit the gas–liquid metal reactivity to derive beneficial properties ("reactive AM"). However, the gas–liquid metal reaction and mechanisms remain unclear. This work clarifies the mass transfer process of oxygen during metal AM through high-fidelity modeling validated with experiments. Counterintuitively, higher temperatures do not necessarily lead to greater oxidation rates during processing. The melt pool has regions of high and low oxygen gains due to temperature-dependent reaction regimes, with concurrent oxygen loss from evaporation of metal suboxides. Thus, the net oxygen flux varies for different materials, and the oxygen content cumulatively changes as multiple tracks are scanned. Overall, we provide guidance to ameliorate or exploit the inevitable gas–liquid interaction in metal AM. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |