| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Effect of Stress-relief Treatments on The Microstructure and Mechanical Response of Additively Manufactured IN625 Thin-walled Elements |
| Author(s) |
Arunima Banerjee, Mo-Rigen He, William Musinski, Paul Shade, Marie Cox, Edwin Schwalbach, Kevin Hemker |
| On-Site Speaker (Planned) |
Arunima Banerjee |
| Abstract Scope |
Additively manufactured (AM) metallic structures are rife with non-equilibrium elemental segregations and high levels of residual stress due to the repeated thermal cycles that occur during printing. These characteristics pose challenges in fabricating AM parts with adequate material properties but can be mitigated through post-processing heat treatments. This study was undertaken to measure the effect of two stress-relief treatments on the microstructure and attendant mechanical response of thin-walled Inconel 625 T-elements fabricated by DMLM. Strain contour maps indicate similar plastic localizations around the nodes of the elements for both stress-relief conditions, suggesting a minor effect of stress-relief temperature on the mechanical response. Electron microscopy analysis of the stress-relieved elements revealed columnar grains oriented along <001> and a well-developed subgrain structure with an average size of 400 nm. Si-rich eta-type and Nb-rich MC-type precipitates decorate the subgrain boundaries, alluding to the importance of powder composition on the formation of secondary phases. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |