Abstract. The analysis of physic-mechanical and thermal physic properties of hard alloys depending on their chemical composition is conducted. The correlation of cutting properties and regularities of carbide tool wear with cutting conditions and thermal physic properties of tool material are disclosed. Significant influence on the tool wear of not only mechanical, but, in the first place, thermal physic properties of tool and structural materials is established by the researches of Russian scientists, because in the range of industrial used cutting speeds the cause of tool wear are diffusion processes. The directions of intensity decreasing of tool wear by determining rational processing conditions, the choice of tool materials and wear-resistant coating on tool surface are defined. Analysis of the mechanism of carbide tool wearDepending on the physical-mechanical properties of work and tool materials, the type of contact interaction, contact temperatures and contact stresses, the type of lubricant-cooling agents, their cooling effect, the possibility of lubricant-cooling agents penetration on the boundary surface of contact interaction and of chemical reactions passing there, as well as the possibility of diffusion processes passing through the boundary of work and tool materials, tool wear can have various physical nature and there may be various wear mechanisms.The diversity of wear content and manifestations can be divided into two types: continuous dissolution at atomic level of worn material in the wearing; wear by removing discrete submicro-and micro-volumes from worn surface, having finite geometrical dimensions.While cutting metals can take place following wear mechanisms: diffusion, adhesion-fatigue, oxidation, abrasive and wear as a result of cutting edge microspall [13]. The diffusion wear is most common of them, which can be described in the following way. Mutual diffusion of tool and work materials occurs while cutting in determination conditions of stable adhesion bond. During this process takes place, first, the carbides dissociation (mostly tungsten carbides) and subsequent diffusion of the elements (W, Ti, C) in the work material (direct diffusion dissolution); second, metal elements diffusion of the work material in the binding phase of hard alloy and its softening. The consequence is bond weakening, holding carbide grains or groups of carbides in the hard alloy, tear-out and ablation by their border volumes of work material. The result of both processes is the wear of tool contact surfaces.According to the views of N. V. Talantov [14], the type of contact interaction in a certain way has an influence on the mechanism and intensity of tool wear, as well as forming main characteristics of the cutting process. It is known that while cutting carbon and lowalloy ferrite-pearlite steels with increase in cutting speed there is regular change of the following types of contact interaction: build-up, throbbing contact zone, and zone of relative stagnation, plastic and viscous contact. For high-alloy s...

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