Abstract
In order to widen the alloy spectrum for the laser powder bed fusion process, apart from the popular Al-Si-based alloys, AlSi10Mg and AlSi12, the precipitation-hardenable AA2099 wrought alloy has been considered in this work. The effect of varied laser power, scanning speed, a preheated base plate (in situ heat treatment) and post-heat treatments on porosity, cracks and microhardness was observed. The results indicate a successfully printed crack-free part with very minimal porosity at 90 W laser power and 550 mm/s scanning speed with microhardness of 72 HV0,1 at a 520°C preheat treatment temperature. The influence of added titanium aluminide powder in crack removal and grain refinement is also reported in this work.
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Acknowledgements
The authors thank ACCESS e.V. for their support in the analytics. The authors would like to thank the German Research Foundation DFG for the kind support within the Cluster of Excellence “Integrative Production Technology for High-Wage Countries”.
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Raffeis, I., Adjei-Kyeremeh, F., Vroomen, U. et al. Investigation of the Lithium-Containing Aluminum Copper Alloy (AA2099) for the Laser Powder Bed Fusion Process [L-PBF]: Effects of Process Parameters on Cracks, Porosity, and Microhardness. JOM 71, 1543–1553 (2019). https://doi.org/10.1007/s11837-019-03367-1
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DOI: https://doi.org/10.1007/s11837-019-03367-1