1 - Revealing the complexity of 3D printed microstructures of steels
Abstract
Differing from conventionally processed steels, products processed by additive manufacturing experience distinct solidification thermal conditions and solid-state phase transformation processes, resulting in unique microstructures. Additive manufacturing microstructures are formed at rapid solidification rates and high thermal gradients, causing chemical heterogeneities that subsequently evolve by the melting and deposition of several subsequent layers. Processing parameters affect the evolution of key microstructural features including the solidification morphology, segregation, grain structure (size and shape), crystallographic texture, microstructure stability, secondary phases, defects and inclusions. In this work, some typical microstructures produced by laser powder bed fusion (LPBF) in commonly used steels, i.e. 18Ni maraging steel, tool steels and 316L stainless steels, will be illustrated. The main objective of this work is to unveil how chemical and microstructural heterogeneity at the micro- and nano-scale of additively manufactured steels affect the microstructural evolution during printing and post heat-treatments. Advanced microstructural characterization, including spatially resolved composition investigations, reveal the micro- and nanostructures of apparently well-known materials after synthesizing and processing them via novel additive manufacturing methods. Atom probe tomography investigations were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility (Ref. CNMS2022-B-01449)
Speaker
Francisca Garcia Caballero
Discover speaker profileCENIM-CSIC, Madrid, Spain
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1 - Revealing the complexity of 3D printed microstructures of steels
Date/Time
20/03/2024
3:00 pm -3:30 pm
Location
Room 6