Laser beam powder bed fusion (PBF-LB) enables the production of complex geometries, allowing for lightweight, stiffnessoptimized and integrally designed components. However, these components typically exhibit low damping, leading to increased vibration amplitudes, sound radiation and reduced lifespan. Particle damping, achieved by incorporating cavities filled with unmelted powder, can mitigate these issues by dissipating energy through inelastic collisions and friction. This study investigates the influence of PBF-LB-induced mechanisms on the damping properties of AlSi10Mg particle dampers, specifically focusing on sintering phenomena, powder packing density variations and partial cavity filling. Additionally, the reproducibility of damping properties across different PBF-LB setups is examined. The results reveal that global sintering, which occurs in dependence of the combination of machine, process parameters and material batch, significantly reduces particle mobility and negates the particle damping effect. Local sintering, which occurs at the cavity walls or edges, is less detrimental but indicates a narrow margin between effective and ineffective damping. Both sintering phenomena are difficult to detect non-destructively, complicating the industrial application of PBF-LB particle dampers with thin and flat cavities. The study highlights the critical role of process variations and sintering mechanisms in influencing damping performance, while also calling for further research into mitigation strategies to ensure consistent and reliable damping results.     «

Laser beam powder bed fusion (PBF-LB) enables the production of complex geometries, allowing for lightweight, stiffnessoptimized and integrally designed components. However, these components typically exhibit low damping, leading to increased vibration amplitudes, sound radiation and reduced lifespan. Particle damping, achieved by incorporating cavities filled with unmelted powder, can mitigate these issues by dissipating energy through inelastic collisions and friction. This study investigates...     »