Influence of the Diffusion Titanizing from Low-Melting Liquid Metal medium on the Performance of Ti-WC-Co and WC-Co Cutting Carbide-Tipped Tool
- Authors: Sokolov A.G.1, Bobylyov E.E.1
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Affiliations:
- Issue: Vol 20, No 4 (2018)
- Pages: 46-59
- Section: EQUIPMENT. INSTRUMENTS
- URL: https://journal-vniispk.ru/1994-6309/article/view/302088
- DOI: https://doi.org/10.17212/1994-6309-2018-20.4-46-59
- ID: 302088
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Abstract
Introduction. A modern approach to improving the operational properties of cutting tools is covering its surface with functional coatings based on carbides, nitrides, oxides of metals such as titanium, chromium, aluminum, silicon, etc. In spite of a number of cutting tool coating technologies, most of it has such drawbacks as the complexity of the equipment, the limited geometry of the coated products, the limited elemental composition of the coatings, and the low operating properties of the coatings formed. The above drawbacks are absent in the technology of diffusion metallization from the medium of low-melting liquid metal solutions. The purpose of the work: to analyze the effect of diffusion titanizing from low-melting liquid metal medium on the wear resistance of carbide-tipped tool and the quality of machined parts. The methods of investigation. Tests for macro- and microhardness, X-ray spectral analysis, X-ray diffraction analysis, in-situ testing on the tools durability are carried out. The quality of the processed parts is determined. Results and Discussion. It is revealed that functional diffusion titanium layers, obtained by diffusion titanizing from low-melting liquid metal solutions, are formed on the TiC-base. At the same time, the coating is characterized by the presence of two layers – surface layer with a microhardness level of about 30 000 MPa and a transitional layer with a gradual decrease in microhardness level and titanium concentration. It is found that the structure of the diffusion and the transition layers depends on the temperature of diffusion saturation, on the duration of diffusion saturation, as well as on the modes of subsequent heat treatment. The developed technology makes it possible to increase tool life as compared to a tool that does not have a coating up to 7.4 times, and also that has a PVD coating up to 1.85 times, depending on the cutting group and the speed of processing. The coating is most effective at high cutting speed – 190 m/min. At the same time, the roughness parameter Ra is reduced to 2 times, depending on the cutting group and processing conditions.
About the authors
A. G. Sokolov
Email: sag-51@bk.ru
D.Sc. (Engineering), Professor, Kuban State Technological University, sag-51@bk.ru
E. E. Bobylyov
Email: ebobylev@mail.ru
Ph.D. student, Kuban State Technological University, ebobylev@mail.ru
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