| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
Predicting the Unique Microstructures of Inoculated High Strength Aluminum Alloys Processed with Wire Arc Additive Manufacturing |
| Author(s) |
Joe Kleindienst, Nick Bagshaw, Jeff Lints, Jeremy Iten, Dennis Harwig, Jonah Klemm-Toole |
| On-Site Speaker (Planned) |
Joe Kleindienst |
| Abstract Scope |
Wire-arc direct energy deposition (WA-DED) is ideally suited to produce large and highly complex shapes. However, many high strength Al alloys including many 2XXX, 6XXX, and 7XXX alloys are considered “unweldable” with arc welding methods due to solidification cracking susceptibility. In this study, secondary phase particles were added to high strength aluminum feedstocks that react in the melt pool to form heterogeneous nucleation sites that act as grain refiners upon solidification and prevent hot cracking. Due to the resulting fine grain structure in WA-DED builds, all microsegregation occurs at grain boundaries in the as-solidified state. The use of dendrite growth models replicating the WA-DED solidification conditions alongside scanning electron microscopy allow this phenomenon to be understood and predicted. This gives novel insight to inoculated WA-DED and the resulting microstructure-mechanical properties relationships. We discuss how similar microstructures in the literature can also be predicted with our modelling approach. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Solidification |