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669.15:539.43 The effect of vacuum-plasma coatings of titanium nitride (TiN) on the fatigue strength of titanium VT1-0 is investigated in terms of the coating deposition and thickness parameters. The analysis of the obtained results is performed with the goal of improving the required fatigue strength of the base material-coating composition. It is shown that in all the investigated cases, TiN coatings enhance the fatigue strength. The optimum range of coating thicknesses is established, in which the change in the deposition conditions influences slightly the fatigue limit. A satisfactory agreement is noted between the experimental and calculated values of fatigue limits obtained using the calculation model earlier proposed by the authors. The principal possibility of essential increasing the fatigue strength has been discussed and confirmed in the case of formation of ultra-thin coatings under well-defined conditions of their deposition.Introduction. Surface hardening of engineering components through the use of vacuum plasma coatings has a number of economic, ecological and manufacturing advantages. These coatings obtained by the physical vapor deposition (PVD) method combined with the ion bombardment-assisted deposition (IBAD) during the condensation of the metal plasma are applied to components using an industrially produced "Bulat"-type deposition system [1]. When producing vacuum plasma coatings with the use of this type of equipment, it is possible to easily vary the parameters of the manufacturing process, such as medium pressure, arc current intensity, gas (N, O 2 , Ar, etc.) supply time, composition of the gas atmosphere, deposition rate, and temperature, which offers a real possibility of optimizing the process for producing coatings with different properties, in particular, the strength properties.In this paper, the influence of vacuum plasma coatings of titanium nitride (TiN) on the fatigue resistance of titanium VT1-0 is investigated in terms of the deposition and coating thickness parameters. The analysis of the results obtained is performed based on the statement of the problem and objectives of the investigation.Problem Statement. Real processes accompanying the formation of coatings are of a complex nature. Depending on the energy-based parameters of the coating deposition process, these may influence the change in the chemical-structural composition and its related physico-mechanical characteristics. Thus, aside from the titanium δ-nitride TiN, coatings of TiN can contain a certain amount of α-Ti and titanium ε-nitride (Ti 2 N) to form solid

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