About this Abstract |
Meeting |
MS&T22: 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 |
Understanding Variations in Solidification Behavior of Additively Manufactured 316L Printed via Laser-Wire Directed Energy Deposition |
Author(s) |
Olivia Denonno, Charles Smith , Matthew Schreiber, Kip Findley, John Speer, Anthony Petrella, Craig Brice, Jonah Klemm-Toole, Zhenzhen Yu |
On-Site Speaker (Planned) |
Olivia Denonno |
Abstract Scope |
Understanding the solidification behavior and microstructure evolution of additively manufactured austenitic stainless steels is essential for qualification of the alloy system across additive manufacturing platforms. Ferritic primary solidification that is commonly observed in conventional processes (e.g., wire-arc welding) may not necessarily occur in rapid solidification additive manufacturing processes. In this study, it was determined that solidification conditions and composition can affect the stability of austenite as the primary solidification phase relative to delta ferrite. The impacts of solidification pathway, thermal gradients and solidification velocities, and composition on solidification behavior of thin and thick laser-wire directed energy deposition 316L parts will be discussed and compared. The observed shift in solidification modes among these two builds can be modeled and understood via a comprehensive microstructure map developed using analytical solidification models. This microstructure map can be used to predict microstructure morphology and size as well as solidification mode across additive manufacturing platforms. |