| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Influence of Lack of Fusion Defects on Tensile Properties of Gas Metal Arc Directed Energy Deposition 316L and 316LSi |
| Author(s) |
Dominic Piccone, Luc Hagen, Stephan Tate, Jonah Klemm-Toole |
| On-Site Speaker (Planned) |
Dominic Piccone |
| Abstract Scope |
Gas metal arc-directed energy deposition (GMA-DED) is a high deposition rate additive manufacturing process that is ideal to produce large structural components. Lack of fusion (LOF) porosity is a common defect in GMA-DED, so understanding LOF formation and the impact on mechanical properties is crucial. In this work, 316L and 316LSi feedstocks were used to fabricate GMA-DED builds with increasing hatch spacing. A combination of in-situ thermography and ex-situ optical microscopy were employed to determine when LOF formed, and tensile testing was used to evaluate mechanical properties. We found that although LOF was observed in-situ, very few pores were observed in the build. Samples of 316L showed decreases in ultimate tensile strength and ductility with increasing hatch spacing, but the tensile properties of 316LSi showed no significant influence. We discuss that 316LSi is more robust against process variations than 316L and should be considered for GMA-DED processing of structural components. |