Paul Scherrer Institut
Apart from the profound advantage of producing complex geometries, laser-powder bed fusion (L-PBF) provides the possibility of manipulating microstructures and crystallographic textures. By combining the texture-manipulation capabilities of L-PBF with the strong orientation-dependence of the transformation induced plasticity (TRIP) and the twinning induced plasticity (TWIP) effects, it is possible to realize L-PBFed components with equal or even superior mechanical properties compared to their wrought counterparts. In this contribution, the mechanical behavior of 316L and 304L austenitic steels processed with L-PBF and with locally tailored crystallographic textures will be shown. Uniaxial tension, compression and equibiaxial tests, paired with in-situ neutron diffraction and EBSD analysis, enable monitoring the microstructural evolution during deformation. Additionally, quasi-static EBSD measurements are performed on multi-textured specimens subjected to V-bending tests. The present investigation highlights how tailored microstructures, produced by L-PBF, lead to different mechanical responses and paves the way for tailored materials with enchanced strength and energy dissipation applications.
Abstract
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