OPTIMIZATION OF CONTENT OF RUNNING-IN COMPOSITION AND  REGIMES OF TRIBOMECHANICAL PROCESSING OF GAS-THERMAL STEEL COATINGS

ZHORNIK Viktor I., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BELOTSERKOVSKY Marat A., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PARNITSKY Alexander M., Junior Researcher of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

YALOVIK Alexander P., Director General, JSC “Neftezavodmontazh”, Novopolotsk, Republic of Belarus

The mathematical model of the process of tribomechanical modification of gas-thermal steel coatings is developed with the use of the method of computational and experimental modeling. This model makes it possible to choose the optimal running-in regimes depending on the given frictional surface parameters after the tribomechanical processing. In this case the optimization parameters are the concentration of the nanosized additive in the running-in composition, the tribocontact pressure and the slip velocity. And the optimization criteria are the friction coefficient, the surface hardness and the friction path in the running-in. It is shown that, for example, with the aim of tribomechanical modification of gas-thermal spray composite coatings produced by the simultaneous spraying of wires from austenitic steels with a nickel content of not less than С_Ni = 10 % and the martensitic steel grade with a carbon content of more than C_C = 0.4 % with the ratio of the diameters of the wires d_mart.st./d_aust.st. = 1.12–1.20, it is necessary to use the running-in composition with a penetration number of N  = 265–340 units at a concentration of diamond-graphite charge in it СShA-A = 0.25–0.35 wt.% having a particle size within d_p = 10–50 nm, and the running-in process must be carried out at a specific load P = 40–50  MPa and a sliding velocity V_sl = 0.20–0.30 m/s.

gas-thermal coatings, steels of austenitic and martensitic grades, tribomechanical modification, running-in composition, optimization of running-in regimes, concentration of diamond-graphite charge, specific load, sliding velocity

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