The main objectives will be to i) investigate the effects of various post-processing methods including thermal treatment as well as mechanical, laser-based and chemical surface treatments on mechanical properties with a focus on LPBF specimens. Ii) comprehensive experimental data will be presented to study the effects of these post-treatments on microstructure, surface morphology and roughness, hardness, residual stresses, and fatigue behavior of the specimens; iii) The obtained results will be compared in detail to select the optimum process. iv) The treatments will be analyzed in individual and hybrid arrangements to explore also their synergy in enhancing the mechanical properties and fatigue performance of metallic parts

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Guest Lecture: Prof. Sara Bagherifard - Politecnico di Milano This course is planned in two main modules: The first one is focusing on introduction to solid state additive manufacturing highlighting cold spray deposition technique. Significant flexibility in size and material selection, high production rate, and high deposition efficiency have made cold spray a promising candidate for additive manufacturing. The main objectives will be to i) introduce the mechanism of deposition in cold spray deposition, ii) explore the aspects related to process parameter selection, iii) evaluate its advantages and limitations compared to other currently established thermal-based additive manufacturing techniques, iv) discuss the range of applications and v) analyze the structural integrity (static and fatigue performance) of cold spray additive manufactured samples. Examples including multi-material additive manufacturing and recent developments on shape control, with process-specific slicing and tool-path planning strategies will be also discussed in detail. Various analysis techniques including experiments, numerical modeling, physics-based modelling strategy as well as machine learning, all implemented to gain control on various cold spray process or performance indexes will be described. The second part of the course will focus on surface post-processing techniques implemented to enhance the performance and functionality of additive manufactured materials. The surface of additive manufactured materials, regardless the manufacturing technique is often characterized with high density of randomly positioned anomalies or agglomerated partially and unmelted powders and spatters in the as-built configuration. Multiple functional aspects including wear, scratch and corrosion resistance, as well as fatigue life and endurance of metallic components are highly affected by surface quality. Therefore, post-treatments are required to counteract the adverse effects of the surface defects. However, the parameters of these post-treatments should be customized based on the material properties and the shape of the part to be treated as well as its working conditions.

In presenza

Presentazione orale

P.D.2-2 - Aprile

17/06 – ore 09:00-13:00 - Aula 5B 21/06 – ore 10:00-13:00 - sala DIGEP B 26/06 – ore 10:00-13:00 - Aula 11B