Diffusion mechanism of cutting Ni-based alloy with carbide tool based on molecular dynamics simulation

Nickel-based alloy Inconel 718 is difficult-to-cut and diffused seriously in cutting process. Its structure contains many complex atoms, such as Ni, Fe, Cr, etc. It is of great significance to study its diffusion wear mechanism under micro conditions. In this paper, a molecular dynamics model based on Ni, Fe and Cr is established. Through Ovito visualisation, the phenomenon of atomic displacement is found in cutting, and the mean square displacement (MSD) is used to solve the diffusion coefficient, the pre exponential factor and the transfer energy of atoms. MD method is used to make vacancy. The gap formation energy of WC Co tool and workpiece at grain boundary and lattice, and the diffusion activation energy barrier were calculated. The diffusion mechanism of Ni, Fe and Cr atoms is revealed by comparing with the experimental phenomena.