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 phase and structure formation of aluminum-matrix composite materials reinforced with titanium carbide during their synthesis and consolidation using the forging were investigated. The influence of copper additives on the structure formation, density, porosity, and hardness of aluminum-matrix composites was determined. The research results revealed the presence of Al+Cu+TiC phases in copperalloyed samples. Studies of density and porosity showed that the samples without copper additives were maximally densified after hot stamping and had minimal porosity, unlike the copper-alloyed composites.

The work shows that there is no significant change in the phase composition of composites with a change in the synthesis temperature, so we can use pre-synthesized heats at a temperature of 950 oC to obtain hot-stamped aluminum-based composites. The best characteristics of the synthesized titanium carbide were obtained for the composition 45Al-11C-44Ti (%, wt.). The lattice period of titanium carbide for this sample is 0.4324, and the particle size of titanium carbide formed after sintering is 0.8-1.5 μm. The influence of the component composition of the initial charge on the features of the structure and the phase composition of the thermally synthesized heat of the Al-C-Ti system was established.