Metal Additive Manufacturing Conference - MAMC 2021

Additively manufactured (AM) samples exhibit a pronounced texture formation along the build direction (i.e. along z-axis) that predefines an anisotropic mechanical behavior of the final bulk materials. Consequently, different mechanical properties can be measured in tensile tests along and perpendicular to the build direction, depending on the initial orientation of the sample in the powder bed. In this study, we investigated the influence of three different hatching strategies on the texture formation of stainless steel 316L. Therefore, six rod-like samples (Ø 5mm, 40 mm height) were synthesized on an EOS M290 machine using two different parameter sets. The samples were scanned in transmission geometry at the high-energy material science (HEMS) beamline P07B at the storage ring PETRAIII at DESY in Hamburg using an energy of 87.1 keV. The three applied scanning strategies led to the formation of (i) a <001> fiber texture, (ii) a biaxial texture and (iii) a mixture of <100> and <110> fiber textures. Moreover, micro-tensile samples (with a diameter of ~500 µm) were fabricated and tested to assess the mechanical properties. Observed differences could be correlated with the different textures. The results indicate that the mechanical properties of AM bulk metals that can be effectively tailored by adjusting the crystallographic texture within the AM components.