|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Advanced Characterization Techniques for Quantifying and Modeling Deformation
|Investigation of the Microstructure and Plastic Deformation of AM 316L Stainless Steels
|Marissa Linne, Jean-Baptiste Forien, Nicolas Bertin, Margaret Wu, Sylvie Aubry, Tatu Pinomaa, Anssi Laukkanen, Kirubel Teferra, Nathan Barton, Y. Morris Wang, Thomas Voisin
|On-Site Speaker (Planned)
We will present our recent investigations of the plasticity of additively manufactured 316L stainless steels (AM316L SS) at quasistatic strain rates. We will first introduce the multi-scale microstructural features that are present in the as-built and annealed AM 316L SS. The second part will present how we test, characterize, and simulate the plastic deformation of different AM316L materials, with and without post-process heat treatment. We use in- and ex-situ electron microscopy (SEM and TEM), in-situ synchrotron high energy X-ray diffraction (HEXRD), mechanical testing, crystal plasticity simulations, atom sensitive HEXRD simulations, and cellular automata. We found the AM316L to deform with both dislocation slip and twinning. We also found an unexpected dislocations configuration in the sub-grain cell walls with a significant density of stacking faults representing a new strengthening source.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.