|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
||Cellular Structures Strengthening Mechanisms and Thermal Stability of L-PBF Stainless Steel 316L
||Jean-Baptiste Forien, Aurelien Perron, Sylvie Aubry, Nicolas Bertin, Amit Samanta, Alexander Baker, Y. Morris Wang, Marissa Linne, Margaret Wu, Nathan Barton, Thomas Voisin
|On-Site Speaker (Planned)
In this work, we investigate the deformation mechanisms and thermal stability of L-PBF 316L SS. Our main results show that the high density of entangled dislocations inside cell walls have a higher tendency to dissociate, forming wider stacking faults while many oxide precipitates are confined inside cell walls. Both features act as barriers to moving dislocations upon plastic deformation and contribute to the high strength. Our dislocation dynamic simulations indicate that segregated particles are effective in blocking dislocations locally, helping the formation of dislocation cells and participating to the material strengthening. Our characterizations using electron microscopy, in situ synchrotron X-ray diffraction, CALPHAD simulations, and tensile testing of post-processed annealed materials reveal three heat treatment zones between 600 and 1200oC where the structure-property relationship can be tuned.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
||Characterization, Additive Manufacturing, Mechanical Properties