Programming Metals by Additive Manufacturing: Spatial Control of Microstructure and Mechanical Performance

Austenitic stainless steels derive their exceptional damage tolerance from deformation mechanisms such as the TransformationInduced Plasticity (TRIP) and Twinning-Induced Plasticity (TWIP) effects, whose activation and evolution are governed by crystallographic orientation with respect to loading conditions and dislocation density. However, conventionally processed materials provide limited control over the spatial distribution of these mechanisms, restricting their ability to accommodate effectively complex multiaxial stress states that are encountered in engineering components. This presentation introduces a new paradigm in which Laser Powder Bed Fusion (L-PBF) is exploited not only as a manufacturing technology but also as a microstructure-engineering tool to tailor crystallographic texture or dislocation density for location-specific mechanical performance. By combining advanced characterization, computational modelling and machine-learning–assisted process optimization, we identify processing routes that promote controlled activation of TRIP and TWIP effects under any loading conditions. The resulting framework enables the fabrication of components with spatially tailored microstructures that adapt their deformation response to local stress states, offering enhanced strength, ductility and damage tolerance beyond what is achievable with conventionally processed materials.
 

Přednáška (v angličtině):
   Dr. Efthymios Polatidis | University of Patras, Greece
   Programming Metals by Additive Manufacturing: Spatial Control of Microstructure and Mechanical Performance