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Investigation Towards AlSi10Mg Powder Recycling Behavior in the LPBF Process and its Influences on Mechanical Properties

: Weiß, Christian; Munk, Juri; Haefner, Constantin Leon

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Univ. of Texas, Austin:
32nd Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference 2021. Proceedings : August 2-4, 2021, held virtually
Pittsburgh: TMS, 2021
Annual International Solid Freeform Fabrication Symposium (SFF) <32, 2021, Online>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ILT ()

Parts fabricated by Laser Powder Bed Fusion (LPBF) technique allow for a high material utilization of a single powder batch, since unfused powder material can be reconditioned and reused in subsequent manufacturing jobs. Due to process induced spatters however, the quality of the powder may change during recycling, which in turn can affect the mechanical properties of built parts. Therefore, a better understanding on the recyclability of the powder material is needed. Within this work, the powder ageing behavior of the lightweight aluminum alloy AlSi10Mg in the LPBF process is investigated. A standard build job is developed and built with ageing powder in 10 consecutive jobs with no refreshing between the cycles. The powder properties as well as the mechanical properties at static load for two different build orientations are investigated. The comprehensive analyses suggest that the powder coarsening may lead to improved mechanical properties during recycling for AlSi10Mg.