Description of the behavior of an Inconel 718 alloy disk using a multi-level physically oriented constitutive model

Abstract

The developed modifications of the multilevel physically-based constitutive model have been applied to describe separate regions of a gas turbine engine disk made of the heat-resistant nickel-based alloy Inconel 718. A Reuss hypothesis-based modification was developed and numerically implemented to describe competing diffusion and dislocation creep mechanisms. To determine the yield strength, a Voigt hypothesis-based modification was employed, aimed at describing inelastic deformation realized by dislocation motion. The obtained results confirm the applicability of these model modifications for describing the macro-properties of the alloy, which depend on the structural state. In the future, this approach will allow the model to be used to optimize the distribution of the material's structural characteristics across the product, thereby achieving the best operational properties. doi 10.54708/19926502_2025_2921083