[16P-T20-03] Effect of the Cellular Structure Morphology on Mechanical Properties in Additively Manufactured Austenitic Stainless Steel Using Direct Energy Deposition
Keywords:Additive Manufacturing, Material Characterization, Stainless Steel, Mechanical Properties, Microstructures
Austenitic stainless steel is widely utilized as a material in additive manufacturing. Austenitic stainless steel undergoes rapid melting and solidification during the additive manufacturing process, resulting in an unique microstructure known as cellular structure. The microstructure exhibits directionality, growing in the direction of heat dissipation, specifically along the <001> direction in the face-centered cubic structure. Cellular structure exhibits various morphologies, such as elongated and equiaxed shapes, depending on the angle between the growth and the observation direction. Consequently, the morphology of the cellular structure is associated with crystallographic texture and Taylor factor, which influences mechanical properties. In this study, we conducted an analysis of the orientation and Taylor factor based on the cellular structure morphology. Subsequently, these factors were correlated with yield strength. Anisotropy in mechanical properties between the building and its perpendicular direction was observed in additively manufactured materials, and this phenomenon was attributed to the cellular structure morphology.