University of Kentucky Study Details Mechanical Behavior of Additively‑Manufactured Inconel 718

Researchers at the University of Kentucky have completed a multiscale mechanical characterization of as‑built laser powder‑bed‑fusion (L‑PBF) Inconel 718 superalloy. Electron backscatter diffraction revealed a columnar grain structure with a partial ⟨001⟩ fiber texture, explaining the material’s pronounced anisotropy. Tensile tests along the build, transverse, and 45° directions showed a consistent flow‑stress ordering of σ_TD > σ_45 > σ_BD, with yield strengths around 750 MPa (build direction) and 800 MPa (transverse). The Yld2004‑3D anisotropic yield criterion was calibrated to the data and integrated into finite‑element simulations that reproduced ductile‑fracture behavior across various specimen geometries.

Indentation testing confirmed higher hardness in the transverse direction by about 30 % and demonstrated asymmetric pile‑up consistent with directional plastic flow. The combined experimental‑numerical framework provides a reliable description of the mechanical response of L‑PBF Inconel 718, supporting design and performance assessment of additively manufactured components.