Authors:
IrmaHeikkilä (1), Oliwer Gustavsson (1), Oskar Karlsson (1), Cameron Blackwell (2), Aneta Chroztek-Mroz (2), Laurent Pambaguian (3), Martina Meisnar (3)
1- Swerim AB, Sweden
2- MTC Ltd., UK
3- ESA, UK
Abstract:
The mechanical strength of laser powder bed fusion (L-PBF) of AlSi10Mg is correlated to a fine hierarchical microstructure formed during the repeated layer-by-layer melting guided by a digital model. The microstructure of the surface area of the L-PBF parts is often different to that of the bulk material as specific laser contouring strategies are applied at the surface areas. However, the evaluation of the mechanical strength is frequently made on machined tensile specimens where the microstructure of the surface area is removed. In this investigation, two different AlSi10Mg powders are processed by two bureaus, each having different contouring strategies. Mechanical testing is conducted with machined and contoured specimens. The microstructure and fracture surfaces of four materials is studied, both in un-treated and annealed conditions. The results show that the mechanical strength of the contoured specimens is slightly lower than the one of the machined specimens and has a correlation to the microstructure at the contour areas.
DOI:
https://doi.org/10.59499/EP246282705
