International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The article investigates the influence of technology and technological parameters of manufacturing on the structure, phase composition and physical and mechanical properties of the Fe-FeCr800 composite system. It was established that the determining factor in phase and structure formation is the manufacturing technology, while vacuum sintering and hot forging have their own optimal technological parameters. At the same time, hot forging makes it possible to obtain a composite with a higher microhardness of structural components due to a change in the content of component components. The results of the research also showed that the preheating time (for 20 min.), as well as thermomechanical treatment, is sufficient for the phase formation process, in particular, with the release of carboboride phases of the type Me3CB and Me3(CB)2, while the densification processes are intensified, which makes it possible to obtain a material with lower residual porosity. Analysis of mechanical tests showed that vacuum sintering makes it possible to obtain composites with higher mechanical properties due to the active interaction between the components of the composite. However, high-temperature annealing after hot deformation will allow for a composite with high mechanical properties.

The article investigates the influence of the technological parameters of manufacturing and the effect of the initial charge on the structure and tribological properties of carbide steel when used in hybrid components of the metal-matrix composite-ceramic system. It was found that the titanium carbide content of the initial charge was the determining factor in the formation of the properties. At the same time, an increase in the titanium carbide content above 20 (wt. %) does not lead to a significant increase in the hardness of the composite, and in some cases even to a decrease in hardness. It is also worth noting that the use of sprayed high-speed steel powder to prepare the mixture allows the composite to be obtained with fewer technological transitions. According to the results of tribological studies, it was found that the lowest wear was observed when the ceramics were paired with a composite with a titanium carbide content of 10 and 30 (wt. %). At the same time, the results of the analysis of friction track profilometry and the size of the contact patch showed that as the content of the carbide component increases to 30 (wt. %), a change in the nature of the friction occurs, accompanied by intensive wear of the ceramic ball. In the ceramic-carbide-steel (10 wt. % TiC) friction pair, however, no wear of the ceramic ball was observed, and the cross-sectional shape of the friction track changed from spherical to flat.

The article presents the results of investigations of tribotechnical properties of powder composite materials based on the ironhigh-carbon (ФХ800) ferrochrome system during dry friction with ШХ15 steel at various loads of 30, 60, and 100 N. It was found that an increase of the load from 30 to 100 N leads to an increase in the coefficient of friction from 0,45 to 0,5 (for 25% ФХ800) and from 0,40 to 0,46 (for 40% ФХ800). At the same time, the mass wear of samples made of powder materials decreases with an increase in ФХ800 content from 25 to 40 (wt. %) and with growth of the load from 30 to 100 N, respectively, from 3,5 – 8,0 to 0,75 – 1,6 mg/km., which provides wear resistance improvement (km/mm) by 2,8 – 2,2 times. X-ray phase full profile analysis using the Rietveld method established that there are 2 phases: metallic α-Fe (79,68%) and carbide Me7C3 (20,32%) in the composite Fe – 25%ФХ800 and 3 phases: α-Fe (69,5%), γ-Fe (3,96%) and carbide Me7C3 (26,57%) in the Fe – 40% ФХ800 composite. Topographic studies of 2D profiles of worn surfaces of composites after friction under different loads were conducted. The results of optical profilometry show that the main mechanism of destruction of the powder composite surface during dry friction with ШХ15 steel is adhesive wear (seizing) of the contacting surfaces.