Abstract
The paper continues the investigation focused on various factors of wear of coatings deposited on metal-cutting tools. The paper presents the results of the investigation focused on the wear process typical for tools with the Ti-TiN-(Ti,Cr,Mo,Al)N multilayer nanostructured wear-resistant coating during the turning of steel. Particular attention has been paid to the study of the diffusion of iron (Fe) from the material being machined into the coating and of coating elements into the material being machined. It has been found that the diffusion of iron into the nanolayer structure of the coating is of periodic decaying pattern. Nanolayers of the coating with the high content of Cr-Mo exhibit the best barrier functions with respect to the diffusion of iron. The investigation has revealed the active oxidation of the layer of the material being machined in contact with the coating, with the noticeable formation of individual grains of iron oxide, which can have an abrasive effect on the coating surface. The studies have detected the diffusion of iron into the coating to a depth not exceeding 300–400 nm and the diffusion of coating elements (primarily, chromium) into the material being machined to a depth not exceeding 100 nm. The process of crack formation in the coating and the role of the crystalline structure and internanolayer interfaces in the inhibition of crack propagation have been investigated.
Published Version
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