| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Large-scale Metallic Components
|
| Presentation Title |
Thermal Model of Hot-wire Additive Manufacturing of Ti-6Al-4V |
| Author(s) |
Lonnie Smith, Andrew Huck, Petrus C. Pistorius |
| On-Site Speaker (Planned) |
Petrus C. Pistorius |
| Abstract Scope |
Laser hot-wire additive manufacturing is a promising method to construct relatively large components. The as-built microstructure is the result of multiple heating and cooling cycles, resulting from the thermal effect of the deposition of individual beads. In this work, a one-dimensional finite-difference model is shown to adequately capture the thermal history within Ti-6Al-4V builds consisting of stacked beads (one bead wide). In particular, the occurrence and positions of white-etching bands match the actual structure. These bands reflect positions that were reheated to a peak temperature somewhere near the beta transus reflecting nearly complete dissolution of the alpha phase. The effect of heat build-up is evident in the overall energy balance, and in the effect of delay time between passes on white-band position. Coupling the thermal history with kinetic models of phase formation upon heating and cooling provides predictions of the microstructure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Modeling and Simulation |