The investigation of the change of chemical composition of the nanopowder of  chromium boride CrB2 by the refining, storage and heating in the air is investigated. The conditions of effective refining of chromium boride from free boron, carbon and chromium, including consistently held alkaline (NaOH) and acid (HCl) treatment are identified. The interaction of chromium boride with atmospheric gases (oxygen and moisture), taking place on the adsorption-diffusion mechanism and accompanied by a significant increase in oxidation in the first 24 hours is studied. It is established that with increasing of the particle size from 26 to 75 nm, the value of oxidation is changed from 17,01·10–7  to 10,82·10–7  kg of oxygen ∙ m–2 of surface of the powder. The analytical dimensional dependence is received for oxidation. The temperature of the beginning of oxidation in the air depends on the level of dispersion and it is 763 К for the nanopowder and 793 K for micropowder.

In this article the authors give the results of the improvement of the computing method of forming at rolling in roll-pass. The task of optimization of the shape of roll-pass based on the efficiency of calibration, where the refined methodology was used in the capacity of restriction, was solved. The choice of target function was validated. It is the maximum efficiency of calibration for power inputs minimization.

It was set the influence of the duration of irradiation of the melt by nanosecond electromagnetic impulses (NEMI) and subsequent silicon modification on the crystallization and structure formation processes, physical-mechanical and operation properties of gray cast iron. The cause of eutectic displacement of gray cast iron depending on the silicon composition when exposed to the melt NEMI was determined. It was proved by the method of X-ray spectrum analysis on the installation “Jolie 8600” (Japan) that under irradiation of the melt by NEMI the solubility of manganese is increased but silicon and carbon content in excess austenite is reduced sharply. Therefore, the melt is enriched with carbon and silicon, thus facilitat- ing the obtaining of eutectic melt composition.

When considering the Navier-Stokes equation the analysis of forces, affecting on the verges of elementary cubic liquid or gas volume, was carried out. This in tern gives a clear physical-mechanical interpretation of the individual terms of this equation. As a result, the equation can be successfully used to solve various metallurgical and foundry problems.

Approximation of experimental information to determine activity of components of concentrated (undiluted) liquid metal alloy should be carried out by using function lgγ/(1 – x)2 instead of lgγ (γ, х – activity coefficient and mole fraction correspondingly) as the main partial characteristic of thermodynamic properties of alloy. In this case, integral thermodynamic characteristics of alloy (mixing energy, “regular function”) will be deter- mined with less estimated error.

The article examines the problem of the identification of discrete-continuous processes in the conditions of parametric and nonparametric uncertainty, as well as the question of the identification in “restricted” and “broad” senses. In the paper it is also analyzed the case when the input variables of the process are connected by stochastic dependence. It also gives the results of the modeling of the process of oxygen-converter steelmaking.

The research of parameters of converter slag of JSC “ZSMK” was conducted, including the series of experimental smelting in a laboratory electric arc furnace. It was determined that the loss of iron with converter dump slag in JSC “ZSMK” after primary treatment on slag fields by removing of magnetic components is on the average 22.7 %, including 9,0 % in the form of metallic iron and 13,7 % in the oxides. In the process of sorting of slag the large fractions enrich themselves with oxide iron, mainly in the form of (FeO) and (Fe3O4), while the (Fe2O3) goes to the smaller fraction. In the process of melting of converter slag there is a partial recovery of iron, which is accompanied by an increase in the content of metallic iron in the average of 11,7 %. At the same time, the main part of the metallic iron is concentrated in large fractions (+40 mm) and is on the average of 18 %, while in the smaller fractions the content of the metallic iron is 5 – 6 %.

Operating conditions and high-temperature gas-and-abrasive wear of charging device of blast furnace are observed. It is established, that a principal view of the wear is the formation of holes on a contact surface of a big cone and a bowl, which lead to a stoppage on repair of all the blast furnace for 72 hours. The measures of increase of service life of charging devices of blast furnaces are set.

Presented is the grinder with translation movement of jaw, which demonstrates better performance in comparison to existing designs. Presented is formula of its minimum speed calculation, analysis of which shows that for given degree of fragmentation (the ratio of size of crushed piece to value discharge hole) jaw crusher performance increases with the increase of compression stroke and angle of capture.

In this article it has been proposed to use the analog of the Pelly-Wiener theorem; the theorem allows to synthesize the unknown projections using known projections. Within the research the special requirements were collected and analyzed, on basis of which the program for modeling sinogram obtaining process, calculating the coefficients of a homogeneous polynomial, examining the fidelity of the object reconstruction was projected and realized using coefficients and actual data.

The calculation methodology of preformation parameters with the use of the software complex DEFORM 3D is presented. It makes it possible to take into account both the wire form and its mechanical properties.

Comparative analysis of laboratory sintering of sinter charge with the addition of recycled ordinary and selected sinter fines was carried out. It was found that the replacement of ordinary recycled sinter fines with the selected sinter fines contributed to increase of sintering productivity without decreasing the sinter quality.

The possibility of the application of electroplastic rolling in order to receive flat-rolled with the ultrafine structure and enhanced service and technological properties out of high strength alloy VT6 is shown. The influence of degree of true strain on the structure and mechanical properties of the alloy is investigated.

Transmission electron microscopy study of the structural transformations in single crystals of TiNi(Fe, Mo) alloys under severe plastic deformation by cold rolling and all-round pressure has been carried out depending on degree of deformation. Micromechanisms of plastic deformation and fragmentation during formation of nanocrystalline and quasi-amorphous states have been analyzed.

The influence of the duration of stay of the steels 30HGSA and R18 as well as titanium alloy VT 20 in the conditions of polymorphic pretransformation and transformation conditions on the mechanical properties is investigated. It is shown that the effect of phase pretransformation allows in wide range controlling the steel defect structure and mechanical properties. The “operation” at polymorphic transformation border promotes to regulate the defect structure density and to optimize mechanical properties of alloys. It is proposed to use the acoustic emission method for phase transformation stage detection and for the development of heat treatment technology with maximize use of the phase pretransformation effects.

Microstructural evolution in superconductive cable made of Nb + 47,5 % Ti alloy and drafted to obtain intermediate reduction from 1,3 to 1, 2 mm has been characterized using atomic force, optical and electron microscopies. This alloy is used for making current-carrying elements in the magnetic system of International Thermonuclear Experimental Reactor. The microstructure and phase composition have been examined as well as the effect they have on the properties of superconductive Nb – Ti alloy after cold drawing and intermediate annealing. Strain localization zones in the fractured zones of the cable have been revealed. The changes in chemical composition and shape of Nb – Ti wires in defect-free break zones have been detected. It has been found out that a diffusion Nb barrier is formed in the copper binder surrounding the Nb – Ti wire.

The plastic deformation process of submicrocrystalline titanium has been investigated. Using speckle-photography and X-ray diffractometry techniques, the local strain distributions and elastic lattice distortions for the work part of the specimen surface have been examined. It is established that in the sample at the prefracture stage a site of localized deformation is formed where the plastic distortion tensor components have maximal values. The elastic lattice distortions occurring on the site boundaries will also achieve maximal values; however, within the site the same values are found to decrease. Moreover, a reduction in the size of blocks occurs within the area of localized plasticity zone.