About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Solidification Cracking Behaviour of AA 6061 Aluminium Alloy with Heated Substrate in Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Sivaji Karna, Rimah Al-Aridi, Tianyu Zhang, Timothy Krentz, Dale Hitchcock, Andrew Gross, Lang Yuan |
On-Site Speaker (Planned) |
Sivaji Karna |
Abstract Scope |
Solidification cracking that occurs while printing AA 6061 aluminium alloy with laser powder bed fusion significantly limits printing of this otherwise popular alloy. Cubic samples were printed with varying laser power, scanning speed, and hatch spacing to investigate the process-structure relationship for solidification cracking. Best conditions were selected based on the relative density and the effect of a heated substrate was investigated. The cracks and as-built microstructures were characterized by optical and scanning electron microscopy. The number of cracks and crack morphology are quantified under all conditions. A relative density of higher than 99% was achieved with room temperature substrate, however, cracks along grain boundaries were observed in all samples. Significantly fewer cracks (< 0.5 %) were observed with specimens printed on a heated substrate. A correlation between process conditions and the formation of solidification cracks was established, and minimization of solidification cracking is discussed in terms of solidification fundamentals. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |