The paper gives an assessment of existing casting methods used for manufacturing products from aluminum materials with carbon filling compounds. It presents results of comparative studies of properties of aluminum materials in which microcrystalline graphite, fullerene black, nanotubes and an amorphous phase of glass carbon have been used as filling compounds.

A new approach to the preparation of aluminum-silicon alloys, based on the concept of the leading role of hydrogen in determining the structure and properties of alloys consists in using as charge materials of silicon dioxide (silica) and hydrogen instead of crystalline silicon was described. Practical ways to implement the new method were proposed on the example of industrial alloys prepared on charge synthetic alloy. It is shown that the application of the proposed method allows to improve the mechanical properties and reduce the coefficient of thermal expansion alloys, Al-Si. The effect of heat treatment on mechanical properties, density and thermal expansion of synthetic alloys was researched.

Some results of researches of processes of heating and restoration of the disperse materials containing iron in laboratory and semi-industrial conditions and the mechanism (physical model) developed on the basis of the obtained data for the description of processes of solid-phase restoration of disperse ferriferous waste in a dynamic layer which can be considered as part of the solution of a task of development of technology of a low-tonnage recycling are presented in the article.Keywords. Recyclimg, the mechanism of solid recovery, dispersion metal wastes, rotary tilting furnaces.

This review describes metal castings produced using 3D technology. Methods for 3D processing of materials related to the additive method of production, characterized by resource conservation. Frame-cellular casting can inherit the structure of nature with the best combination of materials, durability and attractive appearance. 3D technologies expand the existing range of metal products. Among the new foundry processes at the Institute PTIMA of NAS of Ukraine patented 3D technology of molding sand products through the deformation of granular materials, as well as getting sand shell molds for one-time pattern.

During crystallization of castings from white cast iron, carbides Me₃С, Me₇С₃, Me₂₃С₆ were formed depending on chromium and carbon content. Impeded chromium diffusion caused formation of thermodynamically unstable and non-uniform phases (carbides). During heat treatment process stable equilibrium phases were formed as a result of rearrangement of the carbides’ crystal lattice, replacement of iron, manganese, nickel and silicon atoms by chromium atoms. The allocated atoms concentrated, forming inclusions of austenite inside the carbides. Holding during 9 hours at 720 °С and annealing decreased the non-uniformity of chromium distribution in the metallic base of cast iron containing 11,5 % Cr, and increased it in the cast iron containing 21,5 % Cr. Holding during 4.5 hours at 1050 °С and normalization decreased the non-uniformity of chromium distribution in the metallic base of cast iron containing 21,5 % Cr, and increased it in cast iron containing 11,5 % Cr.

Researches on distribution of chrome and copper in the fused coating received from the superficial alloyed wire by boron with in additionally applied electroplated coating of chrome and copper were executed. The structure of the fused coating consists of dendrites on which borders the boride eutectic is located. It is established that the content of chrome in dendrites is 1,5– 1,6 times less than in the borid; distribution of copper on structure is uniformed. Coefficients of digestion of chrome and copper at an argon-arc welding from a wire electrode with electroplated coating are established. The assimilation coefficient for chrome is equal to 0,9–1,0; for copper – 0,6–0,75.

It is shown that melting, crystallization and modifying of metals are difficult nanostructural processes. The nanocrystals and atoms of metals, the centers of crystallization of dendrites, surface-active elements, gases modifying elements, poorly soluble impurity elements in solid metal generally participate in these processes. Their activity and intensity of abstrаction of heat during crystallization define structure of metal

It is shown that impurity modifying of secondary alloys inefficiently because of the high contents in fusion of high-disperse nonmetallic particles. They promote receiving not modified microstructure and pollution of castings by nonmetallic inclusions. Effective ways of modifying of secondary alloys are the methods of the accelerated hardening of castings and hereditary modifying

Quantitative and qualitative composition of the gas emission has been investigated. Quantity of CO, СО₂, NO_x, О₂, paraffin hydrocarbons and benzene derivatives in the reaction zone depending on the duration of the process and temperature 400–800 ºС has been determined. The list of organizations utilizing waste oils as alternative fuel is presented

Physical and mechanical properties of foamed heat-insulating material based on alkali silicate composition and shungite were investigated. The studies determined the ratio of the components of the charge with which it is possible to obtain the optimal ratio of mechanical properties/thermal conductivity. Found that composite materials obtained from shungite filler, have a more porous structure (up to 76% of the volume of the material) and are more uniform distribution of pore size (from 0.11 to 0.2 mm)

The analysis of the reasons of breakages of the equipment of a retayner of the rolling mill PQF of pipe-rolling shop is made. Breakage of a retayner leads to a stop of all shop of hot rolling of pipes. On the basis of the obtained data the solution allowing to increase reliability and durability of the equipment of a retayner is proposed. The solution assumes change of algorithm of work in the operating programmable logical Simatic S7–400 controler of the rolling mill PQF. Changes concern the control unit of movement of a retayner. Transition from the uniformly acceleration of traffic control of a lath of a retayner to not uniformly accelerated is provided. Thanks to this decision the main reason for breakages of the equipment of a retayner of PQF – mechanical blows in gear connections is minimized. The decision doesn’t assume change of a design of the equipment or introduction to work of additional units. Costs of introduction are minimum.

During production of a wire of high groups of durability the problem of ensuring rather high level of ductility is actual. One of options for the prevention of embrittlement of a wire and as, the consequence, increases of plastic properties is use of the device of stabilization of internal tension in a wire. The guidestraightener device improves redistribution of the stretching tension in wire blankets by means of a sign-variable bend. The device of stabilization of internal tension in a wire finds the increasing practical application in the conditions of drawing shop of JSC BSW-management Company of Holding BMC and shows positive results on decrease in number of attacks on reversible twisting.

The first part examines the theoretical possibility of recycling dust of arc steel furnaces. The different modes of dust disposal depending on the task of recycling are discussed: recycling at minimal cost; recycling with a maximum extraction of iron; recycling with maximum extraction of zinc. The results of laboratory studies providing information on the technical feasibility of recycling dust formed at the Belarusian metallurgic plant are provided.

The comparative analysis of firmness of cutting knives from various brands of steel and for chopping of different types of scrap metal is provided in the article

The paper presents the results of the research in phase-structured transformation proceeding in the process of mechanical alloying of compositions of systems «parent metal – alloying oxide – alloying metal with high oxygen affinity, aimed at determining the place and function of the thermodynamic agent in this process.

Describes the features of the design of technological equipment for plastic forming wide flanges in pipe blanks and accessories for the implementation of the technological process. Shows the dependence for determining deforming efforts. Scheme of the stamp to simulate the process of flanging and local deformation of the toroidal section in the flange are presented.

It is now established that the main causes of failure of the transmission parts of the forest machines is wear of their working surfaces. The destruction of the contact surfaces of bevel gears front axle of skidder TTP-401 during its operation is usually connected, with the formation of plastic deformation on the teeth. According to modern concepts of the theory of the destruction of the details revealed that after the formation of plastic deformations leads to microcracks, the development of micro tracks depends on the magnitude and sign of residual stresses. This article presents dependance graphs of vibration acceleration bevel gears front axle skidder subiect to the method of hardening.

Scientific and practical interest is the application of alloying alloy-modifiers for secondary treatment of high-strength cast iron to stabilize the process of spheroidization graphite and achieving higher physical-mechanical properties of castings. The peculiarity of the high-strength cast irons manufacturing technology is their tendency to supercooling during solidification in the mold. This leads to the formation of shrinkage defects and structurally free cementite, especially in thin-walled sections of the finished castings. To minimize these effects in foundry practice during production of ductile iron the secondary inoculation is widely used. In this regard, the question of the choice of the additives with effective impact not only on the graphitization process but also on the formation of the metallic base of ductile iron is relevant. The aim of the present work is to study the peculiarities of structure formation in cast iron with nodular graphite when alloying alloy-modifier based on tin with additions of nanoparticles of titanium carbide, yttrium oxide and graphite nano-pipes is used for secondary treatment. Melting of iron in laboratory conditions was performed in crucible induction furnace IST-006 with an acid lining held. Spheroidizing treatment of melt was realized with magnesium containing alloying alloy FeSiMg7 by means of ladle method. Secondary treatment of high strength cast iron was carried out by addition of alloying alloy-modifier in an amount of 0.1% to the bottom of the pouring ladle. Cast samples for chemical composition analysis, study of microstructure, technological and mechanical properties of the resultant alloy were made. Studies have shown that the secondary treatment of high strength cast iron with developed modifier-alloying alloy results in formation of the perlite metallic base due to the tin impact and nodular graphite with regular shape under the influence of titanium carbide, yttrium oxide and graphite nano-pipes. The tendency of high strength cast iron to «white cast iron» formation has been minimized, and the mechanical properties of the alloy produced correspond to HSCI80.

The paper dwells upon the necessity to increase the operating life of the toothed gearing of skidder transmission by means of strengthening by complex borating. The methodology of comparative testing of tooth gear as well as the stand construction are described. The causes of destruction of tooth gear surface strengthened by different methods have been determined.

The operating conditions of forest machines are analyzed. Transmission parts disabled as a result of intensive wear have been determined, their fracture mechanism has been established. A technique for diffuse impregnation of component parts with powdered mixtures containing boron, aluminum and silicon is offered. An optimal composition and temperature for diffuse impregnation of component parts operating under dynamic loading has been specified. Microhardness of surface and subsurface layers has been studied. Technique for abrasion testing is offered, comparative testing of carburized and borated samples has been carried out

Technology of copper anode balls manufacturing by means of cross-wedge rolling method is developed. The technology satisfies the requirements towards anode balls’ crystalline structure, form and geometrical dimensions accuracy.

The influence of complexly experimental tool steels: C (0,4–0,50%), Si (0,6–1,2%), Mn (0,17–0,8%), Cr (0,8–3%), W (0,9– 4%), Mo (0,01–3.5%) and V (0,28–1,8%) on their ability to hardening due to only high-temperature tempering after induction melting, casting in the ceramic mold and air cooling (without deformation) and after the various modes of complete heat treatment cycle