| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
| Presentation Title |
Failure Evolution and Mechanisms in Additively Manufactured Stainless Steel 316L Under Dynamic Loading Conditions |
| Author(s) |
Katie D. Koube, Kaila Bertsch, Greg Kennedy, Dan Thoma, Josh Kacher, Naresh Thadhani |
| On-Site Speaker (Planned) |
Katie D. Koube |
| Abstract Scope |
Here we describe the spall evolution and failure mechanisms in 3D printed Stainless Steel 316L (SS316L) fabricated through Powder Bed Fusion (PBF). Spall failure is driven by the interaction between defect structures and grain orientations relative to shock wave propagation. Thus, the spall properties and failure responses of PBF SS316L vary based on the process parameters and resulting microstructures. PBF manufactured cylinders were impacted using an 80-mm gas gun at a range of pressures in order to generate varying levels of failure. The target fixture employs two samples, one instrumented to capture free surface velocity profiles and one soft recovered for postmortem microstructure characterization. EBSD in combination with SEM and TEM is used to determine the role of microstructure on spall initiation and propagation. Effects of heterogeneous microstructural defects including voids, melt pool lines, and texture preferences, as contributing to initiation of dynamic tensile and spall failure will be discussed. |