International Journal of Mechanical Engineering

The wear behavior of super-hard coated tools during high-speed dry milling of hardened steel is influenced by the coupling of multiple factors. The high-temperature environment generated by high-speed cutting accelerates coating oxidation and thermal fatigue, leading to a decrease in the bonding strength between the coating and the substrate. The high hardness of hardened steel causes intense mechanical friction and impact, resulting in abrasive wear of the coating and the propagation of microcracks. The lack of lubrication and cooling in dry cutting conditions further exacerbates adhesive wear and diffusion wear on the tool surface. Studies have shown that the matching of coating composition, cutting parameters, and workpiece material properties directly affects the tool wear rate and failure modes. Clarifying the wear mechanism in this process is of great significance for optimizing the design of super-hard coatings, improving tool service life, and promoting the development of green cutting technology.

Super-hard coated tools; High-speed dry milling; Hardened steel; Wear mechanism