About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Effects of Controlled Porosity on Additively Manufactured Stainless Steel 316L Subject to Dynamic Loading |
Author(s) |
Katie D. Koube, Kevin Lamb, Taylor Sloop, Sudarsanam Suresh Babu, Naresh Thadhani, Josh Kacher |
On-Site Speaker (Planned) |
Katie D. Koube |
Abstract Scope |
This presentation describes the influence of porosity in the dynamic (spall) failure of powder bed fusion (PBF) stainless steel 316L (SS316L) under impact testing. Samples were fabricated with porosity levels of 1%, 3% or 5% volume and pore sizes of 200, 350 or 500 microns in diameter. PBF manufactured cylinders were impacted using an 80-mm gas gun at pressures of approximately 4.2 GPa to generate spall failure. Spall strength and failure responses of PBF SS316L vary based on the frequency and size of pores. Photon Doppler velocimetry (PDV) was used to capture free surface velocity profiles during plate-impact experiments, and post mortem electron backscatter diffraction (EBSD) in combination with SEM and image analysis was used to explore local defect structures and determine the role of porosity on spall initiation. This talk will discuss the effects of heterogeneous microstructural defects and pore distribution on the initiation of dynamic tensile (spall) failure. |