| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Section Thickness Dependent Behavior in Additively Manufactured Stainless Steel |
| Author(s) |
Thomas Slagle, Alexandra L Vyatskikh, Sen Jiang, Salma El-Azab, Umberto Scipioni Bertoli, Lorenzo Valdevit, Enrique J. Lavernia, Julie M Schoenung |
| On-Site Speaker (Planned) |
Thomas Slagle |
| Abstract Scope |
In this work, we evaluated the effect of selective laser melting (SLM) process parameters and scan strategy on residual stresses and microstructures of 316L stainless steel parts. We fabricated parts using the NIST AMB2018-01 AM-Bench geometry, and analyzed the microstructure and phase composition as a function of the leg thickness and process parameters. Cooling rates were found to vary threefold (e.g., from ~7x10E5 to ~25x10E5 °C/s) within the same part depending on the leg thickness. In addition, cooling rates were strongly influenced by the scan strategy, with 67° hatch rotation between layers causing ~2x lower cooling rates than 90° hatch rotation. Moreover, higher energy input during printing caused formation of larger surface residual stresses: a ~60% increase in energy input resulted in a ~62% increase in surface residual stress as measured by X-Ray diffraction. Our findings suggest strong relationships between process parameters, part geometries, and resulting microstructures and residual stresses. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Characterization |