Characterization of Surface and Bulk Features of SLM Parts

Abstract:

An experiment-analytical procedure based on the building of an object in severe atmosphere resistant steel by SLM is proposed. The complex shape was investigated with the sectioning and laboratory observation of the physical object. The study evidenced the need to get a variable layer thickness to follow double curvature complex shapes. In particular the key variable in the process is the melt bath dimension by which the metal powder assumes by solidification the required global geometry. It was observed that the bath detected mainly in terms of the area in the section tends to decrease when approaching the surface of the physical model where the complex geometry needs to be described. Relationships describing the bath area behaviour and correlations between surface roughness and internal bath dimensions were found and proposed in detail. The surface roughness is highly correlated with the bath area in the zones of the section approaching the surface.

• Periodical: Key Engineering Materials (Volume 926)
• Pages: 27-33
• DOI: https://doi.org/10.4028/p-7d3yb1
• Online since: July 2022
• Authors: Carlo Bruni*, Daniele Ciccarelli, Tommaso Mancia, Massimiliano Pieralisi, Luciano Greco
• Keywords: Additive Manufacturing, Complex Geometry, Microstructure, Prototyping, SLM, Surface Roughness

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