Non local crystal plasticity and in-situ EBSD of deformation anisotropy in LPBF-ed Inconel 718

Toursangsaraki, Maziar, Tang, Ruilin, Du, Dafan, Zhang, Xu, Dong, Anping, Leen, Seán B., Xuan, Yu, Zhang, Zhenbo, Sun, Baode. (2026). Non local crystal plasticity and in-situ EBSD of deformation anisotropy in LPBF-ed Inconel 718. International Journal of Mechanical Sciences, 310, 111136. https://doi.org/10.1016/j.ijmecsci.2025.111136

Abstract

This study developed a novel non local dislocation-based crystal plasticity fast Fourier transform (CPFFT) model in DAMASK to quantify the impact of microstructural heterogeneities on the anisotropic evolutions in the microstructure and tensile properties during uniaxial tensile deformation of laser powder bed fused (LPBF-ed) IN718 superalloy in transverse (TD) and building (BD) directions. To quantify the effects of texture and geometrically necessary dislocations (GNDs), four model specifications were compared, including local (LSC) and non local (NSC) single crystal (SC) of specific grains, as well as local (LPC) and non local (NPC) polycrystal (PC) plasticity overall models. In-situ EBSD was conducted during tensile tests in TD and BD to validate the modeling outputs. Modeling results showed that TD loading produced a higher locally accumulated plastic slip and GND density at grain boundaries and slip bands, leading to greater overall dislocation strengthening than BD. GND density had a more significant effect on the deformation behavior in SC than PC models, while contributing more to strengthening in PC than in SC. The anisotropic and heterogeneous deformation in each grain mainly depended on its orientations in different directions, followed by the effects of PC texture and GND density. GND density had the highest hardening effects for <110>//loading direction (LD), followed by <111>//LD and <001>//LD grains. The highest yield strength belonged to <111>//LD grains, followed by <110>//LD and <001>//LD because of their ascending/descending Schmid factor/Taylor factor values. <212>//LD-oriented grains had the highest overall hardening slope, followed by <313>//LD, <111>//LD, <110>//LD, and <001>//LD directions.

Funder

Advanced Materials-National Science and Technology Major Project
Aeronautical Science Fund of China
Science and Technology Commission of Shanghai Municipality,
Taighde Éireann—Research Ireland

Publisher

Elsevier

Rights

CC BY

cb

Collections

Mechanical Engineering (Scholarly Articles)