(V) Dependence of the mechanical properties of laser-powder-bed-fusion-processed Hastelloy X on crystallographic orientation

Additively manufactured parts, and specifically those processed through laser powder bed fusion (LPBF), have been shown to possess anisotropic properties due to particular microstructural features such as fine cellular sub-grain structures, columnar grains, and defects. Moreover, mechanical properties may be influenced not only by process-related factors such as build orientation, but also by those inherent to the material such as crystallographic orientation. This is important in materials like Ni-based superalloys, where crystallographic orientation can have a significant impact, for instance, on elevated temperature properties. In this work, highly texturized parts of Hastelloy X, a solid-solution strengthened Ni-based superalloy, were built through LPBF. Tensile testing samples aligned with three crystallographic orientations (<100>, <110>, and <111>) were extracted, and their mechanical behavior and microstructural features were studied.