| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
O-29: Leveraging Solid-state Phase Transformations to Tailor Residual Stress in Additively Manufactured Metal Components |
| Author(s) |
Aleksandra L. Vyatskikh, Xin Wang, Lorenzo Valdevit, Enrique J. Lavernia, Julie M. Schoenung |
| On-Site Speaker (Planned) |
Julie M. Schoenung |
| Abstract Scope |
Residual stress (RS) that forms during additive manufacturing (AM) of metals can cause cracking, delamination and reduced fatigue life of components. Since RS is an inherent consequence of thermal processing, it cannot be fully eliminated through AM process optimization. Here, we demonstrate that RS in AM-fabricated parts can be manipulated through alloy design. We explore Fe and Fe-50Cu (wt.%) parts that were fabricated by directed energy deposition. We find that highly compressive surface RS of ~-190 MPa is present on the top surface of Fe-50Cu parts, while surface RS in pure Fe parts is found to be tensile (~58 MPa). Through transmission electron microscopy and electron backscatter diffraction, we demonstrate that the Cu-rich phase in Fe-50Cu parts exhibits high dislocation density, suggesting preferential plastic deformation of the Cu-rich phase. We attribute the differences in RS to the difference in solid-state phase transformations experienced by the two metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Iron and Steel |