Universität Stuttgart
In laser and powder bed-based additive manufacturing (PBF-LB/M) of aluminum, the choice of materials today is limited to a few Al alloys that have very limited mechanical and technical properties. A characteristic problem affecting the processability of many aluminum powder alloys is their susceptibility to hot cracking. As known from fusion welding, there are several strategies to avoid hot cracking. The objective of this work is to present a digital approach to develop hot cracking resistant aluminum alloys, thereby increasing the processability of these alloys. For this purpose, the manufacturing parameter range for processing the powder alloy EN AW-6060 (Al MgSi) is investigated experimentally using the PBF-LB/M method and the susceptibility to hot cracking is determined metallographically. Then, a metallurgical strategy is presented by adding Al Si10Mg powder material to avoid hot cracking. This strategy can be implemented in a digital workflow. It is expected that by adjusting the process parameters, hot cracks will be reduced to some extent and admixture will be required for a complete elimination. A digital workflow helps to calculate the amount of admixture needed to prevent hot cracking. With the development of powder alloys that are more resistant to hot cracking, the application of the PBF-LB/M process can be expanded in various industries.
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