Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-3-11
УДК 669.017
Polunov I.L.
STUDY OF THE INFLUENCE OF DIFFERENT TYPES OF HEAT TREATMENT ON THE STRUCTURE AND STRENGTH PROPERTIES OF HIGH-STRENGTH MARTENSITIC AGING STEELS

RETRACTED 06.08.2018

The influence of residual austenite on the strength maraging steels 08Х15Н5Д2Т and 03Н18К9М5Т. To assess the content of residual austenite was measured the magnetic properties of the samples taken from two maraging steels after different heat treatment. Ways of improving the viscosity characteristics and of reducing the threshold of cold brittleness due to the formation in the martensitic structure of the steels in austenite to the special morphology depending on the heat treatment technology.

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2.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-12-17
УДК 669.28
Batienkov R.V., Bolshakova A.N., Efimochkin I.Yu.
THE PROBLEM OF LOW-TEMPERATURE PLASTICITY OF MOLYBDENUM AND ALLOYS BASED ON IT (review)

The main methods of making billets from molybdenum and its alloys were examined in this paper such as powder metallurgy and vacuum remilting. The influence of the methods making billets on the formation of the strength and plastic characteristics of molybdenum alloys is analyzed. To increase the low-temperature plasticity of molybdenum alloys, it is necessary to use more pure raw materials, rational alloying and technological methods which make it possible to obtain an alloy with a fine-grained structure.

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3.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-18-27
УДК 620.1
Klyukvina T.D., Vlasova K.A., Leonov A.A., Yashina S.A.
STUDY OF THE MECHANISM OF FORMATION OF STRENGTH IN SELF-HARDENING MIXTURES WITH A PHENOLIC BINDER (review)

The aim of the work is to study the technology of obtaining forms using self-hardening mixtures based on phenolic binders. The article gives statistical data about using different types of mixtures for the cores production. The classification of the most common resins used in molding using cold-hardening mixtures is given. The specific characteristics, advantages and disadvantages of cast alkaline phenolic resins are discussed. Time characteristics and strength parameters are analyzed on the basis of the curing curve of self-hardening mixtures. Examples of defects in forms, cores and castings associated with strength of the mixtures are given. The mechanism of strength formation of alkaline phenolic resins is considered (alpha-set process).

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4.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-28-36
УДК 678.7:667.621
Mukhametov R.R., Petrova A.P., Ponomarenko S.A., Akhmadieva K.R., Pavlyuk B.Ph.
INFLUENCE OF WOVEN FIBROUS FILLERS OF VARIOUS TYPES ON PROPERTIES OF CURED BINDER VS-2526K

The article describes properties of epoxy binder VS-2526K in an initial condition and after curing, and influence of fillers of various types on properties polymer composites on their basis. The results of research of binder and some materials on its basis by methods of differential thermal analysis, thermogravimetric analysis and IR-spectroscopy are given and discussed. It is shown the influence of filler nature on structure and water resistance of polymer composites. The polymer matrix between glass fibers is characterized be more tension, than for carbon fibers.

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5.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-37-48
УДК 678.8
Timoshkov P.N., Khrulkov A.V., Yazvenko L.N., Usacheva M.N.
COMPOSITE MATERIALS FOR NON-AUTOCLAVE TECHNOLOGY (review)

The advantages of non-autoclaved molding technology in comparison with autoclave molding are considered in this article. The use of an autoclave ensures a high-quality curing of the polymer matrix, but because of the high cost of the apparatus, a non-autoclave method is widely used. Also, a molding scheme is given, the properties of the prepregs and resins for non-autoclaved molding of various manufacturers, the properties of the fiber fillers, the process of consolidating the prepreg with non-autoclave curing are analyzed.

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6.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-49-59
УДК 620.179:678.8
Raskutin A.E., Makhsidov V.V., Smirnov O.I., Kasharina L.A.
MONITORING OF THE DEFORMABILITY OF THE COMPOSITE STRUCTURE OF THE ARCH BRIDGE BASED ON FIBER-OPTIC SENSORS

A description is given of the developed fiber-optic system for monitoring structural loading (arch-bridge elements) operating in real time and warning of approaching the critical level of loading. The criteria for working capacity of the design of the a two-lane automobile arched bridge. The choice of the main criterion was made on the basis of the principle of assessing the structural stability of the structure taking into account the capabilities of the equipment used. It is shown that the relative axial deformation of the arched elements practically did not change over the period of observation.

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7.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-60-67
УДК 678.747.2
Mishurov K.S., Pavlovsky K.A., Imametdinov E.S.
ENVIRONMENTAL EFFECTS ON PROPERTIES OF CFRP (CARBON FIBER REINFORCED PLASTIC) VKU-27L

The influence of climatic factors and fluids on the properties of CFRP VKU-27L, on the basis of reinforcing carbon fabric and binder VST-1208, manufactured by autoclave molding is investigated. It is shown that the CFRP VKU-27L has a high level of property preservation (not less than 82% of the initial value) when exposed to environmental factors (thermal and hydrothermal aging, resistance to water, moisture, fuel, oil, anti-icing fluid and solvent).

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8.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-68-76
УДК 629.7.023.222
Kuznetsova V.A., Deev I.S., Zheleznyak V.G., Silaeva A.A.
ANTI WEAR COATING WITH QUASICRYSTAL FILLER

The paint and varnish material filled with finely divided quasicrystals, and system of coverings on its basis is developed. As basis for polymeric matrix epoxies, as the most demanded material for anti wear coatings have been chosen. Optimum degree of dispersion of quasicrystal fillers and its content in epoxy and polyamide matrix is defined. The paint coatings filled with quasicrystals, possess the increased wear resistance, and its physico-mechanical properties do not concede to let-out analogs.

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9.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-77-85
УДК 621.357.7
Salakhova R.K., Tihobrazov A.B., Nazarkin R.M.
OBTAINING A POSITIVE MICROHARDNESS GRADIENT AS A METHOD OF INCREASING THE ADHESION OF ELECTROLYTIC CHROMIUM COATINGS

A method is proposed for obtaining thick chrome coatings in a self-regulating electrolyte with chromium plating with a positive microhardness gradient in thickness. The adhesion strength of the graded chromium coating was estimated by the temperature change method and the impact method on the vertical copra U-2M and metallographic studies of the individual layers of chromium deposited under various electrolysis regimes. The results of the investigation of residual macrostresses by x-ray diffractometric method on the PSF-3M analyzer of Rigaku firm in chromium coatings of various microhardness are presented.

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10.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-86-94
УДК 620.172.254
Golinets S.A, Gorbovets M.A., Karanov V.A.
EFFECT OF SAMPLES PARAMETERS ON MECHANICAL PROPERTIES OF HEAT-RESISTANT TITANIUM AND NICKEL ALLOYS

As is well known, for tension test and stress-rupture test of titanium alloys applying to compressor blades and discs, in most cases are used the standard samples with 5 mm diameter and 25 mm gauge length. In a construction of gas turbine engines are applied the compressor blades of the small sizes made of fine dimensional stampings that causes the necessity of monitoring procedure of material of these compressor blades on small samples with a diameter of 3 mm and gage length of 15 mm. This work is devoted to effect of samples parameters on short-term strength and stress-rupture characteristics of heat-resistant titanium alloys VT3-1, VT9, VT18 and nickel alloys VGL12U, GS6U.

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11.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-95-102
УДК 620.1:666.7
Grinevich A.V., Lavrov A.V.
THE ESTIMATION OF BALLISTIC PROPERTIES OF CERAMIC MATERIALS

The article analyzes the criteria for estimating the ballistic durability of ceramic materials. It is shown that the physicomechanical characteristics of ceramics obtained during static tests make it possible to assess the ballistic characteristics of ceramics only at a qualitative level, and therefore it is necessary to develop special test methods that ensure the ceramics work efficiency at high rates of its interaction with the impactor. A technique for direct estimation of the ballistic characteristics of ceramics using a trap with discrete screens is described. The results of a comparative evaluation of the ballistic characteristics of experimental batches of armored ceramics based on aluminum oxide and silicon carbide are presented. A close correspondence of the results of direct ballistic tests and calculations on the basis of the attached mass model is shown.

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12.
dx.doi.org/ 10.18577/2307-6046-2018-0-3-103-110
УДК 678.747.2
Bolshakov V.A., Antyufeeva N.V.
INVESTIGATION OF THE MODIFICATION SHUNGITE OF CARBON PLASTIC ON THE BASIS OF EPOXY MATRIX

Structural polymeric composite materials on the set of characteristics are at a level, and sometimes exceed the characteristics of other structural materials. Recently, modification of polymer composites by carbon nanoparticles is of particular interest, but due to their high cost and limited volume, a number of difficulties in their application may arise. Shungites are a natural rock containing fulleroid nanostructures. In addition, they have a significantly lower cost compared to synthesized carbon nanoparticles and their use in large volumes is not difficult. The purpose of this work is to study the effect of modification of polymeric composites with shungite.

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