In-situ neutron diffraction study: High temperature anisotropic deformation mechanism of Ni-based superalloy built by additive manufacturing

The typical texture and columnar grain structure are suspected to be the reason for the anisotropic mechanical properties of materials built by additive manufacturing (AM). The proposed in-situ tensile tests at 700˚C are beneficial for the fundamental understanding of anisotropic deformation mechanism, and also the different behavior at slow strain rate. The study material is a solid solution strengthened alloy, Hastelloy X, built by laser powder bed fusion, which has no gamma prime precipitation and is relatively easy to obtain crack-free components. Hence, the work could mainly focus on the influence of texture and grain structure. Combined with the preliminary work on the microstructure and texture study of deformed samples, a deformation mechanism model for Ni-based superalloy could be established. The study could be highly beneficial for building up robust AM applications.