|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Interplay between Geometry, Defects, and Porosity on the Mechanical Behavior of AM Components
||Garrett Pataky, Benjamin A Smith, Christopher M. Laursen, Jody Bartanus, Jay D. Carroll
|On-Site Speaker (Planned)
The flexibility of additive manufacturing (AM) makes the manufacturing of complex geometries possible, but standards for critical defect sizes and porosity levels have not been fully established. Geometric defects were intentionally manufactured into exemplar tubular components in two material systems (AM SS 316L and AlSi10Mg) to measure their effects on mechanical properties. Levels of ductility and porosity were varied through heat treatment and reducing laser manufacturing power in the AlSi10Mg specimens. Ductility of the base material was the primary factor for determining the degree of sensitivity the resulting mechanical behavior had to the geometric defects. Fractography via scanning electron microscopy (SEM) was used to identify interactions between the porosity and defects. Increasing porosity above a threshold (~5%) led to density-dominated component behavior, regardless of the introduction of intentional large-scale geometric defects. This competition between geometric defects and porosity must be understood for accurate predictions of AM component behavior. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.