Enhancing the durability of cutting carbide tools by controlling the state and properties of its surface layers using complex chemical and thermal treatment
Authors: Bobylyov E.E.
Published in issue: #12(108)/2020
DOI: 10.18698/2308-6033-2020-12-2043
Category: Metallurgy and Science of Materials | Chapter: Science of Materials in Mechanical Engineering
A current way of increasing cutting efficiency in the turning operation is applying functional coatings based on carbides, nitrides, carbonitrides, etc. on the cutting tool surface. Most technologies for applying functional coatings are supposed to use technically sophisticated, expensive equipment. In addition, the coatings have a sharp change in properties at the coating-coated material boundary. The technology of diffusion saturation from the medium of low-melting liquid metal melts lacks these disadvantages. The aim of the work was to study the effect of the formation of a coating based on titanium carbide on the surface of a cutting tool made of hard TiC-WC-Co and WC-Co alloys on its wear resistance and the quality of the product surface after turning. The research methods included field tests, micro-x-ray spectral analysis, optical microscopy, and microdurametric tests. The paper presents the results of research of turning of materials of various cutting group using a carbide tool with a functional diffusion coating obtained due to saturation in the melt containing Pb, Bi, Li, Ti. The resulting coatings had a thickness of 3-6 microns, and contributed to an increase in tool life up to 7.4 times compared to the tools with PVD coating and tools without coatings as well as a decrease of the roughness parameter Ra of the treated surface up to 2 times.
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