The Influence of Zirconium and Titanium Nitrides Based Coatings on Tribodeformation Processes of Friction While Cutting by Carbide Inserts

The article is devoted to an experimental study of the influence of wear-resistant coatings ZrN, TiN+ZrN, (Ti-Zr)N, ZrN-(Ti-Zr)N-TiN, TiN, deposited on T15K6 hard alloy inserts, on the tribological and deformation characteristics of the process of turning steel workpieces 45 and 12Х18Н10Т, and subsequent comparison of the calculated values of the maximum temperatures of the rake face of the lathe cutter. When processing steel 45, a significant reduction in contact and average temperature in the cutting zone is ensured by a combination of tribological and deformation indicators when using TiN+ZrN and ZrN+(Ti,Zr)N+TiN compositions. When turning stainless steel 12Х18Н10Т, the presence of coatings on carbide inserts had a lesser effect on the course of deformation processes. The main effect of modifying the working surfaces of the tool is to change the thickness of the zone of secondary plastic deformations and reduce the length of contact of the chips with the rake surface. In this case, the greatest effect in reducing surface temperatures due to the influence on the complex of tribostrain indicators and enhancing the thermodissipative capabilities of the contact zone is demonstrated by ZrN and ZrN+(Ti,Zr)N+TiN coatings. Based on the results of full-scale experiments and digital modeling using the obtained experimental data, it was established that the temperature distributions in the area of tribocoupling of chips with the surface of a hard alloy in the presence of a multilayer coating on it are associated with the wear of a metal-cutting tool, which makes it possible to evaluate the impact of wear-resistant coatings through changes in the temperature regime in contact zone. This influence of surface modification on a set of tribostrain indicators, which also determine the nature of the distribution of contact temperatures, should be taken into account when developing new compositions and structures of wear-resistant coatings along with their physical and mechanical properties at the microlevel.

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