Characteristic of macroscopic-mesoscopic diffusion wear of cutting tool in high-speed turning of titanium alloys

In order to study the influence mechanism of different alloy component on the wear of cutting tool, the macro thermodynamic and wear characteristics in the high-speed turning of titanium alloys with the YG8, YT15 and YW2 were investigated through using both macroscopic-mesoscopic scale-span correlation method and molecular dynamics theory, the chaos degree of atomic group in the turning process of three materials was analyzed, and the diffusion characteristics of atomic group for different tool materials were revealed. The results show that the temperature on the rake face of YW2 is the highest, and its atomic group chaos movement type has reached the cleavage along crystal plane with high degree of inward diffusion and serious diffusion wear. The density and energy of atomic group of YG8 and YT15 are stable, and the atomic group chaos movement type is micro crack propagation with low degree of outward diffusion and diffusion wear. The diffusion wear degree of three tool materials in the high-speed turning is YW2>YT15>YG8.