About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Special Session
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Presentation Title |
Influence of the Loading Direction on the Mechanical Properties of Additively Manufactured Metals |
Author(s) |
Janith Wanni, Chamara Herath, Ajit Achuthan |
On-Site Speaker (Planned) |
Ajit Achuthan |
Abstract Scope |
Unlike the classical grain structure in conventional stainless steel, the growth direction of the epitaxial grain structure in additively manufactured (AM) stainless steel (SS 316L) is highly correlated with the thermal gradient. The thermal gradient also influences the formation of the tubular dislocation network, typically found in AM material due to the high solidification rate. In this study, the role of the direction of the tubular subgrain features on mechanical properties is investigated. Samples manufactured using laser engineered net shaping (LENS) were tested using in-situ micron-scale tensile testing. The mechanical performance of specimens loaded in the direction parallel and perpendicular to the build directions of the wall were compared. Differences in the slip band formation between the two testing directions were studied. An empirical model based on dislocation theory to predict the yield strength and ductility of the material by taking the aspect ratio of the tubular microstructure is proposed. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |