Correlations of Geometry and Infill Degree of Extrusion Additively Manufactured 316L Stainless Steel Components

• Published in: Materials Vol. 14; no. 18; p. 5173
• Main Authors: Rosnitschek, Tobias, Seefeldt, Andressa, Alber-Laukant, Bettina, Neumeyer, Thomas, Altstädt, Volker, Tremmel, Stephan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 09.09.2021; MDPI
• Subjects: Additive manufacturing; Austenitic stainless steels; Bend strength; Bend tests; Bending modulus; debinding and sintering; Deviation; effective porosity; Extrusion; infill structure; Injection molding; Investigations; material extrusion additive manufacturing; Mechanical properties; metal additive manufacturing; Modulus of elasticity; Product development; Rapid prototyping; Redevelopment; Tensile tests
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14185173

This study focuses on the effect of part geometry and infill degrees on effective mechanical properties of extrusion additively manufactured stainless steel 316L parts produced with BASF’s Ultrafuse 316LX filament. Knowledge about correlations between infill degrees, mechanical properties and dimensional deviations are essential to enhance the part performance and further establish efficient methods for the product development for lightweight metal engineering applications. To investigate the effective Young’s modulus, yield strength and bending stress, standard testing methods for tensile testing and bending testing were used. For evaluating the dimensional accuracy, the tensile and bending specimens were measured before and after sintering to analyze anisotropic shrinkage effects and dimensional deviations linked to the infill structure. The results showed that dimensions larger than 10 mm have minor geometrical deviations and that the effective Young’s modulus varied in the range of 176%. These findings provide a more profound understanding of the process and its capabilities and enhance the product development process for metal extrusion-based additive manufacturing.