Wear resistance of hydrogenated high nitrogen steel at dry and solid state lubricants assistant friction

O.A. Balitskii a, V.O. Kolesnikov b,c, A.I. Balitskii b,d,* a Ivan Franko National University of Lviv, 50 Drahomanova str., 79005, Lviv, Ukraine b Karpenko Physico-Mechanical Institute National Academy of Sciences of Ukraine, 5 Naukova str., 79060, Lviv, Ukraine c Taras Shevchenko National University of Lugansk, 1 Gogol Sq., 92703, Starobilsk, Ukraine d West Pomeranian University of Technology in Szczecin, 19 Piastow av., 70-310, Szczecin, Poland *  Corresponding e-mail address: balitski@ipm.lviv.ua

Purpose: This paper is devoted the investigation hydrogen influence on of wear resistance of high nitrogen steel (HNS) at dry and solid state lubricants assistant friction. It has been established that after hydrogenation at 250 N loading the wear rate increased by 2.9 ... 4.1 times. Microhardness of hydrogenated layer was 7.6 ... 8.2 GPa, that is increased after hydrogenation in two times. After adding the (GaSe)xIn1-x compounds to the tribo conjugates by X-ray diffraction analysis it has been established  the appearance of new phases which formed during the friction process and detected on the friction surface. Design/methodology/approach: This work presents research results concerning the comparative tests of high nitrogen steels in the circumstances of dry rolling friction. It was conducted the experiments to determine the tribological properties of high-nitrogen steels under rolling friction. The test pieces were manufactured in the form of rollers, and rotated with a linear velocity 2.27 m/s (upper roller), 3.08 m/s (bottom roller). Upper roller is made from HNS was subjected for hydrogenation. Analysis of friction surfaces indicates the complex mechanism of fracture surfaces. The results of the local X-ray analysis and X-ray diffraction analysis has been established the appearance of new phases and elements on the friction surface. Findings: It has been found that the level of wear resistance of the investigated materials under hydrogenation. Compounds realize chemisorption, tribochemical mechanisms of the formation of thin protective (anti-wear, antifriction) layers on metal surfaces. Research limitations/implications: An essential problem is the verification of the results obtained using the standard mechanical tests, computer-based image analysis and other methods. Practical implications: The observed phenomena can be regarded as the basic explanation of reduces the plasticity characteristics after hydrogenation. Applying the (GaSe)xIn1-x compounds as a lubricant will allow the formation of films on friction surfaces that can minimize surface wear, which will contribute to the transition to a wear-free friction mode. The protective film is a barrier to high shear and normal loads, preserving the base metal of the part and providing reduced wear and friction.

Originality/value: The value of this work is that conducted experiments permit to determine the tribological properties of high nitrogen steels under rolling friction after hydrogenation. After adding (GaSe)xIn1-x compounds to the tribo conjugates after due to X-ray diffraction analysis it has been established the appearance of new phases which formed during the friction process and detected on the friction surface. Keywords: Dry friction, Hydrogenated high nitrogen steel, Wear resistance, Embrittlement Reference to this paper should be given in the following way: O.A. Balitskii, V.O. Kolesnikov, A.I. Balitskii, Wear resistance of hydrogenated high nitrogen steel at dry and solid state lubricants assistant friction, Archives of Materials Science and Engineering 98/2 (2019) 57-67.