| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
New Insights on Dislocation Barrier Effect of the Cellular Subgrain Feature in Directed Energy Deposited SS 316L |
| Author(s) |
Janith Wanni, Ajith Achuthan |
| On-Site Speaker (Planned) |
Janith Wanni |
| Abstract Scope |
The studies of local deformation under uniaxial tensile loading of the directed energy deposited stainless steel 316L have shown that cellular subgrain feature introduces barrier effect. The barrier effect manifests as a microscopic surface texture and slip band refinement producing exceptional mechanical properties. With the objective of deriving a comprehensive understanding of the mechanism responsible for the barrier effect, an extensive nanoindentation study was performed. The variations of nano-hardness and load-depth behavior across a representative region on the specimen surface is investigated. The results show that these characteristics have a bi-modal distribution consistent with the cellular subgrain feature morphology. The material behavior in the cell interior exhibits lower strength and higher plasticity compared to the behavior exhibited by the regions around the cell walls. A relationship between the bulk mechanical response of the material and the local mechanical responses of cell interior and cell walls was derived. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Iron and Steel |