ECOLOGY AND RATIONAL USE OF NATURAL RESOURCES
Dispersed composition and morphology of the electric steel dust have been studied by optical scanning electron microscopy. Possibility of allocating ultrafine particles and separation of large mechanical stirring in water was considered. Sedimentation separation of particles into three fractions was conducted and dust particles characterization from each fraction was determined.
METALLURGICAL TECHNOLOGIES
The investigation of slag formation in tundish of continuous caster for casting melting low-carbon and low-alloy steel weighing 360 tons is exe- cuted. It is found that the casting series of 5 – 10 melts there is a significant increase in weight and the chemical composition of the slag. A key role in this process is the flow of the slag inclusions, pop out of bottled steel. For casting low carbon steel weight surfaced inclusions is about 30 % by weight of the final slag, and the casting alloy steel – about 50 %. A much smaller role in the chemical composition of the slag is dissolved refractory lining: 4 – 5 % by weight of the final slag for chamotte brick lining and 14 – 15 % for magnesia lining. The changes in the chemical composition of the slag raises its melting temperature at 80 – 140 °C.
Fe – Cu melts have been studied by viscosimetry upon heating and subsequent cooling. Alloys containing 0; 0.5; 1.0; 3.0; 5.0; 10.0 % wt Cu.
Based on the measurement results, the boundaries of the regions of microinhomogeneities in the melts are constructed in the phase diagram above the liquidus.
The given article contains consideration of process of production and operation glass-mould. Also described the main reasons for decrease in firmness of the operation glass-moulds. The microstructure of preform is investigated at layer-by-layer and traditional hardenings of castings. Con- trol of phase composition of cast iron and formation of separate structural components in the course of hardening of castings allows to provide the increased heat resistance and heat conductivity to details of glass-moulds. In presented article described influence of each structural component on the complex of properties of details working in the conditions of cyclic thermal loadings and abrasive wear.
ENGINEERING IN FERROUS METALLURGY
The process of billets upsetting with axial hollowed dies is considered. Plastic zones boundaries determination and deformation zone pattern are described in the paper. Paper subject is focused on the analysis and the combination of some results, obtained with five different experimental and theoretical methods.
MATERIAL SCIENCE AND NANOTECHNOLOGIES
The structural transformation, magnetic and mechanical properties in plastically deformed high coercivity Fe – 15 % Co – 30 % Cr – 2 % W – 1 % Mo – 1 % Ti alloy were investigated. Metallographic and x-ray methods showed that in addition to the single-phase α-solid solution at the 1220 – 1180 °C in the alloy there is a region of the metastable α-phase at 670 – 700 °C. Annealing of the alloy after cold deformation at this tem- peratures does not course recrystallization and it is accompanied by polygonization processes. The correlation between the magnetic and mechanical properties of the alloy with the initial state-phase α-solid solution and it’s structure is established. It is shown that, depending on the initial state of a single-phase α-solid solution alloy can be obtained high magnetic or mechanical properties.
Calculations of the thermodynamic activity of components in the A – B binary metallic system that contains intermetallic chemical compounds of the AmB type or ABl type, where m and l = 1, 2, 3, …, according to the model of ideal associated solutions, can be made with the acceptable accuracy on the assumption that the chemical composition and thermodynamic properties of associated compounds are the same as in intermetallic compounds.
In this paper, using the principles of minimization of the Gibbs free energy of the phase diagram is constructed of Fe–Mn–B, and given its mathematical description. Examples of using the model to assess the type and amount of impurities in manganese alloys, metallic manganese, iron and pure boron.
The depletion of high-quality ore deposits makes it necessary to develop technologies of processing of poor and complex ores such as sideroplezite, titanomagnetites and etc. Processing of these ores in a blast furnace or in well-known alternatives is only possible in limited quantities. The principle of selective reduction and extraction of metals from oxide crystalline lattice of lean and complex ores without melting has been developed. Processes of charge and mass transfer along defects of oxide crystalline lattice have been analyzed. It has been shown, that the reduction of cations is carried out by attachment of electrons associated with anion vacancies. The vacancies and “redundant” electrons form during extraction of oxygen anions, as a result of chemical reaction with reducing agent.
INFORMATION TECHNOLOGIES AND AUTOMATIC CONTROL IN FERROUS METALLURGY
The structure of the dialog procedure of pipe processing route plotting manufacture by combination of cold straining is described in report 2. Simulation environment Arena is used for creating the forecast in the industrial complex process of multiproduct and multioperational industrial system.
SHORT REPORTS
ISSN 2410-2091 (Online)