Influence of Diffusion Saturation from Liquid Metal media Solutions to Mechanical Properties of Hard Alloy Cutting Tool

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Introduction. One of the most popular ways to increase operational properties of cutting carbide-tipped tool is applying functional coatings on its surface. At the same time, coatings based on titanium carbide TiC are widely used. A sufficiently high scientific and practical interest, from the point of view of the formation of functional coatings, is the technology of diffusion metallization of cutting tools made of hard alloys in Pb-Bi-Li-Ti melts, which can significantly increase its resistance. However, the effect of functional coatings based on titanium carbide TiC on the mechanical properties of hard alloys is described insufficiently. The purpose of the work is to analyze the effect of diffusion saturation of a carbide cutting tool in a Pb-Bi-Li-Ti medium on its mechanical characteristics. The methods of investigation are the following: tests for macro- and microhardness, studies of flexural strength, impact strength and fracture toughness. Results and Discussion. It is revealed that the formed functional diffusion layers affect the mechanical characteristics of coated instruments. In this case, the main influence on the mechanical properties of the coated products is exerted by the temperature of diffusion saturation and its duration. When forming diffusion layers with a thickness of up to 5 μm for VK alloys, the flexural strength, impact strength and fracture toughness gradually increase, with a further increase in thickness, the above characteristics decrease, for TK alloys the thickness is 4 μm. It is found that the application of diffusion titanium coatings can increase such mechanical characteristics of carbide tools as hardness (up to 91 HRA), tensile strength in bending (for 9%WC-15%TiC-6%Co – 1380 MPa, for 92%WC-8%Co – 1875 MPa), impact strength (for 79%WC-15%TiC-6%Co – 2.99 kJ/m2, for 92%WC-8%Co – 5.97 kJ/m2) and fracture toughness (for 79%WC-15%TiC-6%Co – 7.65 MPa, for 92%WC-8%Co – 11.9 MPa).

About the authors

B. E. Eduard

Email: ebobylev@mail.ru
Kuban State Technological University, 2 Moskovskaya st., Krasnodar, 350072, Russian Federation, ebobylev@mail.ru

K. L. Natalia

Email: msat_kubgtu@mail.ru
Kuban State Technological University, 2 Moskovskaya st., Krasnodar, 350072, Russian Federation, msat_kubgtu@mail.ru

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