XVII Международный Российско-Китайский Симпозиум
НОВЫЕ МАТЕРИАЛЫ И ТЕХНОЛОГИИ
18 – 22 августа 2025 г.
Екатеринбург
A.V. Makarova, E.V. Kharanzhevskiyb, N.N. Sobolevac, V.A. Sirosha, A.G. Ipatovd
a Institute of Metal Physics, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
b Udmurt State University, Izhevsk, Russia
c Institute of Engineering Science, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
d Udmurt State Agrarian University, Izhevsk, Russia
An analysis of the wearless effect for carbon steels subjected to surface alloying with metallic bismuth using the technology of short-pulse laser melting is performed. The tribological studies have been conducted in conjunction with industrial metal alloys such as gray cast iron, nickel-aluminum bronze, and aluminum alloy. Under boundary lubrication conditions, the bismuth-alloyed steel surface tested in contact with the analyzed alloys has shown ultralow value of the friction coefficient in the range from 0.04 to 0.08. It is established that a high level of fatigue strength of the aluminum alloy and the absence of adhesion with respect to a bismuth-alloyed steel surface provide conditions leading to the manifestation of the wearless effect (zero wear) at friction velocities amounting up to 9 m/s and at normal loads amounting up to 250 N. The metallographic analysis and 3D profilometry of friction surfaces have revealed that the process of self-organization of the contact zone is athermal in nature (without frictional heating) and is determined by a plastic flow of the contacting surfaces with no mutual destruction thereof. The conducted investigation has revealed a novel wearless effect based on the elimination of adhesion between the materials of the friction pair, rather than on a selective transfer of copper in the presence of lubrication (the fundamental scientific discovery of the wearless effect in the course of Garkunov–Kragelskii friction). The revealed effect opens new potentialities in providing wearless bearing couplings via suppressing the molecular and mechanical components of friction between contacting bodies operating under the conditions of disrupted lubrication supply and under high kinematic and dynamic loads. The obtained data have a high scientific and practical potential and could be implemented in mechanical engineering for designing plain bearings.
a Institute of Metal Physics, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
b Udmurt State University, Izhevsk, Russia
c Institute of Engineering Science, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
d Udmurt State Agrarian University, Izhevsk, Russia
An analysis of the wearless effect for carbon steels subjected to surface alloying with metallic bismuth using the technology of short-pulse laser melting is performed. The tribological studies have been conducted in conjunction with industrial metal alloys such as gray cast iron, nickel-aluminum bronze, and aluminum alloy. Under boundary lubrication conditions, the bismuth-alloyed steel surface tested in contact with the analyzed alloys has shown ultralow value of the friction coefficient in the range from 0.04 to 0.08. It is established that a high level of fatigue strength of the aluminum alloy and the absence of adhesion with respect to a bismuth-alloyed steel surface provide conditions leading to the manifestation of the wearless effect (zero wear) at friction velocities amounting up to 9 m/s and at normal loads amounting up to 250 N. The metallographic analysis and 3D profilometry of friction surfaces have revealed that the process of self-organization of the contact zone is athermal in nature (without frictional heating) and is determined by a plastic flow of the contacting surfaces with no mutual destruction thereof. The conducted investigation has revealed a novel wearless effect based on the elimination of adhesion between the materials of the friction pair, rather than on a selective transfer of copper in the presence of lubrication (the fundamental scientific discovery of the wearless effect in the course of Garkunov–Kragelskii friction). The revealed effect opens new potentialities in providing wearless bearing couplings via suppressing the molecular and mechanical components of friction between contacting bodies operating under the conditions of disrupted lubrication supply and under high kinematic and dynamic loads. The obtained data have a high scientific and practical potential and could be implemented in mechanical engineering for designing plain bearings.
