About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
The Effects of Post-Weld Processing on Friction Stir Welded Additive Manufactured AlSi10Mg |
Author(s) |
Michael Eff, Harvey Hack |
On-Site Speaker (Planned) |
Michael Eff |
Abstract Scope |
Given the limited build volumes of additive manufacturing (AM) machines, a method of combining AM with traditional manufacturing methods is needed. Welding of AM components is a solution to this challenge. This study investigated the feasibility of using friction stir welding (FSW) to join powder-bed-fusion laser (PBF-L) AlSi10Mg and examined the effects of industry standard post weld processing techniques. The samples which underwent a post-weld annealing heat treatment had cracking outside of the stir zone. The crack contained evidence of liquation near single-phase Si despite the annealing temperature being 27°C (49°F) below the reported solidus temperature. The annealing heat treatment was in the partial liquation regime for AlSi10Mg per CALPHAD simulations. The voids and crack formation mechanisms were caused by equilibrium liquation coupled with the unique microstructure and stress state. FSW was determined to be a feasible method of joining PBF-L printed aluminum alloys with minimal knock-down in tensile strength. |