| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Effect of wire melting state on solidification microstructures of alloys in wire-laser directed energy deposition |
| Author(s) |
Lin Gao, Tao Sun |
| On-Site Speaker (Planned) |
Tao Sun |
| Abstract Scope |
Directed energy deposition (DED) with a coaxial wire-laser configuration has advantages for producing large-scale metallic components because of its fast deposition rate, high feedstock efficiency, and low manufacturing costs. This work studies the wire-laser DED of Inconel 718. Post characterization reveals a cluster of refined grains at the center-bottom region of the as-printed track. Operando high-energy synchrotron X-ray experiments and multi-physics modeling are applied to study the mechanism responsible for the formation of this unique microstructure. X-ray diffraction provides direct evidence that the feeding wire can reach the melt pool bottom and release solid particles (primarily carbides) near the mushy zone owing to insufficient melting. Consequently, these sub-micron sized particles suppress the growth of large columnar grains and cause the formation of unique microstructural heterogeneity. This discovery offers new opportunities for tailoring the solidification microstructure by controlling the melting state of the feedstock wire in DED process. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Solidification |