The problems of creation of structural high-strength steels of unified chemical composition and production technologies ensuring the yield point in the range of 590–950 MPa have been considered. The possibility of obtaining such materials appeared after extensive studies on the Gleeble 3800 thermomechanical simulator and Quarto 800 laboratory mill confirming the possibility of unifying chemical compositions of high-strength steels with adjustable yield strength within the specified limits. Given the identity of the results of steel treatment on the mentioned equipment and Quarto 5000 industrial mill, the results achieved in the present work could be realized in industry.

Purpose of the present investigation is to determine the optimal heat treatment parameters that ensure yield strength over 690 MPa in combination with toughness of at least 35 J/cm² at temperature –70°C in new economically alloyed cold-resistant steel. The effect of various quenching and tempering parameters on mechanical properties, structure of steel and fracture mode of samples after impact tests at temperature –70°C has been studied. The relationship between the properties, structure and fracture mode of steel samples is shown. The optimal heat treatment parameters of new economically alloyed cold-resistant steel are determined.

The influence of the strain rate in the range of 3.3·10^-5 to 332 sec^-1 on the ductility of pure magnesium under hydrostatic pressure varying since 0.1 to 800 MPa and room temperature (293 K) has been researched. High plasticity of magnesium with small and large deformation speed under pressure was found. At pressure pure magnesium ductility reduces while strain rate increases; reduced plasticity is observed only when strain rate is equal to 0.17 sec^-1, and above this rate, on the contrary, the ductility of magnesium increases. It is shown that the pressure at ductile-brittle transition increases from 142.2 to 241.5 MPa with strain rate increasing from 3.3·10^-4 up to 332 sec^-1.

The paper studies the combined effects of rare earth metals such as praseodymium, neodymium and erbium, melting technologies on intermetallic alloy based on nickel aluminide and pure charge materials using 25, 50 and 75 wt. % of waste, the technology of casting single-crystals of crystallographic orientation [001] and their heat treatment combined with hot isostatic pressing (HIP), on mechanical properties and long-term strength at the level of passport data.

The paper gives a brief review of properties and applications of developed extra-hard nanostructured composite materials and coatings based on them. The presentresearch suggestsaerospace applications of nanostructured composite materials based on carbides, carbonitrides and diboridesof transition and refractory metals. To improve the technical and economic performance of gas turbine engines, it is advisable to use new composite structural materials whose basic physicomechanical properties are several times superior to traditional ones. The greatest progress in developing new composites should be expected in the area of materials created on the basis of polymer, metal, intermetallic and ceramic matrices. Currently components and assemblies of gas turbine engines and multiple lighting power units with long operation life and durability will vigorously develop. Next-generation composites are studied in all developed countries, primarily in the United States and Japan.

In work researches of phosphate coatings are conducted. By means of methods of mathematical modeling of contact interaction it is established that on wear of phosphate coatings the greatest influence renders their roughness. For decrease in wear of the running-in coverings applied to protection of steel products, the way on increase in service life of phosphate coatings is offered.

The paper develops method for manufacturing wear and corrosion-resistant gradient coating. A special feature of the proposed method is the creation of chemical composition gradient due to controlled variation of the gas phase composition when applying supersonic cold gas-dynamic spraying. This ensures high adhesive strength of the composite coatings of the metal-non-metal system in combination with high micro-hardness of the peripheral layers. Such functional gradient coatings have wide practical applications.

The paper presents complex studies of nanostructured powder of Cu-Hf-BN alloy system and functional wear and corrosion-resistant coatings based on It are presented. A technology for applying a composite nanostructured coating of the Cu-Ni-Zr-Cr-Hf-BN system onto a steel substrate (steel Kh18Yu5S) was developed using supersonic cold and microplasma deposition techniques. The coatings have elevated level of microhardness (up to 32 GPa), adhesive strength (more than13 MPa), resistance to stress-corrosion crackingand a wide range of operating temperatures from 850 to –196°C.

The technology of obtaining composite cathodes for vacuum magnetron deposition of functional coatings has been developed and masteredin the Scientific Nanotechnological Center of the NRC “Kurchatov Institute” – CRISM “Prometey”. The example of the Ti–Ru system shows the prospects for creating composite cathodes from expensive and hard-deforming materials by means of activated soldering with amorphous solders.

The paper presents results of a development study of optimal alloy composition based on Ni–Cr–Si–B system for the casting of microwires in glass insulation by high-speed quenching. High-resistant microwires manufactured for the developed alloy have low temperature coefficient of resistance (less than 5 10^–6K^–1) and high linear resistance (more than 1000 kOhm/m) in a wide range of positive and negative temperatures (from –196 to 250°C).

Titanium monoboride – titanium matrix composite powders have been synthesized by self-propagating high temperature synthesis (SHS) in titanium and boron reactive powder mixtures. Titanium matrix (binder) content varied from 20 to 60%. The SHS powders were cladded on VT1-0 titanium sheet by electron beam facing. Cladded coatings’ thickness varied from 1 to 3 mm depending on the pass number. Phase composition and structure of powders and coatings were investigated by X-ray diffraction, optical and scanning electron microscopy. According to structure investigation and hardness profiles view in the “coating – titanium base plate” transition zone an adhesion of the coating to the base is high. The hardness and abrasive wear resistance tests of the cladded coatings were carried out depending on the powder used for cladding. The maximum hardness of the coatings strengthened by eagle-like titanium monoboride inclusions as compared with VТ1-0 base increases 2.2 times and abrasive wear resistance 3.7 times. According to previously obtained results hardening and abrasive wear resistance of titanium monoboride is much weaker than that of titanium carbide: hardness increases 1.7 times, wear resistance 5.8 times.

The results of complex studies on the development of a powder composition Ge–Cr–Zr–Ce–WC, promising for the production of functional cold-resistant coatings by microplasma sputtering, are presented. The coating has high adhesive strength (more than 40 MPa) and microhardness (up to 10–12 GPa) and withstands repeated thermal cycling in the temperature range from –60 to 20°С.

A composition of a precision alloy based on the Ni–Cr–Mo system for wear and corrosion-resistant coatings by supersonic cold gas dynamic spraying has been developed. The optimum coatings composition provides high level of operational properties; its application is very promising for protection of structural and functional elements of marine equipment from aggressive environmental influence.

The paper presents first results of studying samples of high-temperature carbide hardened intermetallic Ni–Al–Ta–C alloys manufactured by selective laser melting. It is shown that the right technological parameters of atomization ensure correct metallurgical processes. The parameters of selective laser melting were determined, which made it possible to obtain a dense structure of the synthesized material.

Microhardness, coefficient of friction, modulus of elasticity, elastic recovery coefficients and plastic deformation resistance of functional coatings are determined. To study the wear resistance of coatings, tests were carried out for the intensity of wear with abrasive action. Experimental values of wear intensity of functional coatings are obtained, which allows predicting their service life. Mechanical and wear-resistant characteristics were thoroughly studied and coatings with highest properties were determined.

The paper considers changes in the properties of rubber in large-sized products using the method of dynamic mechanical analysis (DMA) in comparison with the previous physical and mechanical investigation data. It is possible to predict changes in properties of rubber during storage or operation if using the combined estimation and prediction curve for the most characteristic indicator of aging.

The article is devoted to the urgent scientific problem of creation and introduction in shipbuilding of high-strength, water-resistant dielectric glass-reinforced hot pressed plastics on the basis of bi- and polyfunctional epoxy-amine binders and glass fabrics from alkali, quartz and silica glass.

The fire-resistance (State Standard GOST 28157-89, analogue of UL-94 test) of epoxy compositions based on D.E.R.-330 resin, isomethyltetrahydrophthalic anhydride and new epoxy-containing aryloxycyclotriphosphazenes was studied. Thermogravimetric analysis and microstructural studies of the coke residue formed during combustion were carried out. It has been determined that resistance to combustion of the cured compositions increases significantly as grows phosphazenes content in them. This is due both to the increase in the amount of porous coke residue formed during combustion (which acts as a barrier to flame propagation and heat transfer from the flame to the sample), and to the increase in the size of the pores formed therein. The obtained data can be used to create tough and flame-resistant composites for microelectronics, aviation and other industries.

The effect of boron on the structure and mechanical properties of a welded high-strength steel with a standard yield strength of 750 MPa has been studied. The flux-cored wire of grade 48PP-69 has been developed on the basis of results.

The paper offers technology of argon-arc surfacing with titanium wire in order to form heat and wear resistant coating based on the titanium cuprides. The influence of surfacing modes on the chemical compound and structure of formed coatings is determined. The wear resistance and heat resistance at 600°C and 800°C were researched for copper–titanium coating with 8–63% titanium.

The resistance to atmospheric corrosion of 25Kh1MF (25Cr1MoW) steel after aluminizing and thermal improvement has been studied. It is established that the reduced resistance of the aluminized layer to atmospheric corrosion is caused by surface defects such as cracks or pores or by absence of a layer containing the intermetallide Fe₃Al. In the aluminized layer containing aluminum-doped ferrite, aluminum nitrides have been found that prevent cold diffusion welding of fasteners’ thread surfaces.

One of main operability criteria for fuel subassemblies (FSAs) in fast sodium reactor cores, i.e. the criterion of tolerable shape change in hexagonal wrapper tube is formulated. The equations which enable one to inquire into kinetics of the stress-strained state of a three-dimensional body are adapted to FSAs operating conditions. A mathematical model of radiation-induced shape change in ferritic-martensitic steel of grade EP-450 is proposed. With regard to the proposed model and data on the radiation-induced shape change in other current and prospective structural materials of BN reactor cores, blocks for recording of radiation-induced swelling and radiation-induced creep are developed for ANSYS software package, which made it possible to utilize its potentials within this area of focus. The performed test case with proposed models of the radiation-induced swelling and radiation-induced creep demonstrates that the developed blocks sufficiently describe the radiation-induced shape change in the examined structural materials exposed to radiation. A calculation of the radiation-induced shape change in the FSA hexagonal wrapper tube with various speeds of the radiation-induced swelling and the radiation-induced creep moduli is performed. The calculations results and the results of FSAs post-irradiation dimension inspection are compared. Recommendations for use of the proposed models aimed at performing calculations, as well as estimating the radiation-induced shape change and defining the stress-strained state of FSAs are made.