| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Large-scale Metallic Components
|
| Presentation Title |
Understanding Stress Evloution in Wire Arc Additive Manufacturing of LTT Alloy Using Finite Element Methods |
| Author(s) |
Guru Charan Reddy Madireddy, Yousub Lee, Kyle Saleeby, James Haley, Christopher Fancher, Ke An, Wei Tang, Thomas Feldhausen, Alex Plotkowski |
| On-Site Speaker (Planned) |
Guru Charan Reddy Madireddy |
| Abstract Scope |
The residual stresses in large-scale additive components manufactured by wire-arc additive manufacturing (WAAM) are dependent on various factors such as geometry, tool path, interlayer temperatures, process conditions, and material. In this work, a part was printed on a wire-arc based additive system (Tormach) using low temperature transformation (LTT) alloy, which induces compressive stress through martensite phase transformation. The phase transformations and temperatures during the printing process were observed using operando neutron diffraction and IR cameras. Finite element modeling was employed to integrate the thermo-mechanical additive manufacturing process with phase transformations models, Johnson-Mehl-Avrami-Kolmogorov (JMAK) for diffusional transformation and Koistien-Marburger (KM) diffusionless transformation. Transformation induced plasticity was considered to incorporate the stresses from phase transformations along with thermal stresses. The model enables a deeper understanding of stress evolution mechanisms during WAAM and was validated against the temperatures and lattice strains measured using operando neutron diffraction and IR data. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Phase Transformations |