抄録
This study focuses on Powder Bed Fusion (PBF) technique, which is one of the process of the metal-based Additive Manufacturing (AM). In PBF technique, the metal powders are melted by a laser irradiation and solidified as a built structure. However, the spatter particles are generated from the melt pool during the PBF processes. Spatter particles causes deterioration of building accuracy due to the adhesion to the surface of the built structure. In this study, the laser irradiated area is observed by using a high-speed camera, and the melting and solidification of metal powder during PBF process are investigated. The influence of surface roughness in the substrate on the scattering ratio of spatter particles is evaluated. As results, the size of droplets generated around the melt pool was influenced by the surface roughness of the substrate, and the scattering ratio of spatter particles increased with decreasing the surface roughness of substrate.
