|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
|In Situ Monitoring of Recrystallization during Laser Powder Bed Fusion of 316L Stainless Steel by Means of Synchrotron X-ray Diffraction
|Claire Navarre, Milad Hamidi, Reza Esmaeilzadeh, Charlotte de Formanoir, Lucas Schlenger, Steven van Petegem, Nicola Casati, Roland Logé
|On-Site Speaker (Planned)
Laser Powder-Bed Fusion (LPBF) is an Additive Manufacturing process based on layer-by-layer selective melting and solidification of metallic powders. While LPBF allows fabricating highly dense and complex parts, it suffers from unrepeatability of generated microstructures. Accordingly, an online monitoring system able to identify the occurrence of specific events is being developed, through in situ synchrotron X-Ray Diffraction (XRD). The kinetics of fast recrystallization during both LPBF and subsequent operando laser heat treatments is investigated in 316L, by looking at the evolution of XRD peak narrowing over time. The influence of dislocation density on the recrystallization kinetics is quantified by performing these laser treatments on a cold-rolled 316L plate and an LPBF 316L sample. The latter is treated by Laser Shock Peening in order to increase the dislocation content. Contributions from grain size and dislocation density are analyzed and linked to EBSD maps of the recrystallized microstructures.
|Additive Manufacturing, Characterization, Iron and Steel