Research of plastic behavior in high-speed cutting Inconel718 based on multi-scale simulation

The nickel-based alloy Inconel718 is widely used in the field of aerospace because it has a high yield strength, high corrosion resistance, and high-temperature oxidation resistance. These excellent performances were obtained through the precipitation strengthening and since it has the phase of body-centered tetragonal γ ″ and face-centered cubic γ ′.The alloying elements which make material strengthen exist in the form of high hardness compounds, such as TiC, NbC, and other interphase hard point. These high hardness compounds result in complex cutting deformation of cutting process. In this paper, the multi-scale finite element model of Inconel718 is established and the cohesive element is added into the brittle phase particles to conduct the cutting simulation. The simulation results obtained by the proposed multi-scale simulation model are closer to the experimental results, so as to illustrate the accuracy of the proposed model. On the basis, the action mechanism of the brittle phase on the grain dislocation slip and the effect of brittle phase on the morphology evolution of serrated chip are analyzed.