| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-153: The Significance of Length Scales and Segregation in Strengthening Selective Laser Melted Stainless Steel Microstructures |
| Author(s) |
Tatu Pinomaa, Matti Lindroos, Martin Walbrühl, Nikolas Provatas, Anssi Laukkanen |
| On-Site Speaker (Planned) |
Tatu Pinomaa |
| Abstract Scope |
The mechanical properties of additively manufactured 316L steel depends strongly on the cellular rapid solidification microstructure. In this work, we connect processing conditions to the resulting microstructure, and relate this further to the micromechanical response. Directional phase field simulations are used to generate process-microstructure maps. The phase field model is mapped to have controlled solute trapping behavior and to follow the kinetics of continuous growth model, through matched interface asymptotics. The cell spacings are compared to experiments from the literature. The generated cellular structures are analyzed with a Cosserat micromechanical crystal plasticity model, which takes into account local solid solution strengthening variation, microstructural length scale effects, and hardening effects. Micromechanical in polycrystalline structures are analyzed. We show that the cell spacing and solute segregation affect the overall hardening behavior, and also influence plastic localization and geometrically necessary dislocation (GND) type hardening. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |