About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
Phase Transformation and Microstructure Evolution of Al-Mn Alloy Made by Laser Additive Manufacturing |
Author(s) |
Qingyu Pan, Monica Kapoor, Sean Mileski, John Carsley, Xiaoyuan Lou |
On-Site Speaker (Planned) |
Qingyu Pan |
Abstract Scope |
While additive manufacturing (AM) provides opportunities to produce net-shape components for Al alloys, the microstructural evolution and phase transformation during AM and post-AM heat treatment was still not fully identified. In the present work, AA3104 alloy was fabricated by laser direct energy deposition (DED). The fast cooling and repeated thermal cycle during deposition resulted in different phase transformation behavior as compared to conventional DC-cast alloys. The nucleation and growth of constituent phase particles during AM were both sensitive to AM parameters (laser power, scan speed, hatch space, layer thickness) and the thermal property of substrate. In-process thermal history, mainly the reheating effect caused by subsequent layer fabrication, dominated the constituent particle phase transformation and distribution, resulting in a larger amount of α-Al (Fe,Mn)-Si particles in as-built material as compared to as-cast counterpart. Epitaxial grain growth by laser solidification promoted large columnar grains (a few hundred micrometers) along the build direction. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Additive Manufacturing, Aluminum, Phase Transformations |