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Aviation materials and tecnologes №2, 2020

DOI: 10.18577/2071-9140-2020-0-2-3-9

UDC: 669.018.29

Pages: 3-9

N.A. Yakusheva1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

HIGH-STRENGTH CONSTRUCTIONAL STEELS FOR LANDING GEARS OF PERSPECTIVE PRODUCTS OF AIRCRAFT EQUIPMENT

For modern products of the aircraft equipment, including those for parts of the landing gears, new steels, ensuring the increase of weight efficiency of structures, durability and reliability of products are of high demand.
FSUE “VIAM” has developed technologies of melting and deformation of large-size billets from high-strength constructional steels VKS-9 and VKS-12 (forgings of more than 300 and 200 mm respectively), operating up to 250 °С.
We have performed researches of steels purity for nonmetallic inclusions, durability, ductility, fracture toughness, fatigue strength and crack resistance.

Keywords: high-strength steel, melting, deformation, landing gear, mechanical properties, fatigue, tensile strength.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-10-16

UDC: 669.018.29

Pages: 10-16

G.S. Sevalnev1, M.V. Antsyferova2, K.V. Dulnev1, T.G. Sevalneva1, I.I. Vlasov1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»
[2] Institute of Metallurgy and Materials Science A.A. Baykova of Russian academy of sciences

INFLUENCE O F NITROGEN CONCENTRATION ON THE STRUCTURE AND PROPERTIES OF SPARINGLY ALLOYED STRUCTURAL STEEL

The article analyzes the effect of nitrogen concentration on the structure and properties of sparingly alloyed structural steel. It has been determined that increasing the concentration of nitrogen as an alloying element increases hardness and grinds the formed martensite structure. It has been shown that during testing of the samples for wear resistance under conditions of dry friction, an increase in nitrogen concentration increases the wear rate. As the concentration approaches the solubility limit, the solid solution hardens and the wear rate decreases by a factor of 1.5–1.8 compared to a sample containing nitrogen as an impurity. The increase in the austenitization temperature during heat treatment leads to an increase in the wear rate by 18–25%.

Keywords: economically alloyed structural steel, pressure electroslag remelting, high nitrogen, hardness, wear resistance.

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    11. Krylov S.A., Makarov A.A., Tonysheva O.A., Mosolov A.N. Investigations of the influence of quality of the consumed electrode on the process of electroslag remelting under pressure of high-nitrogen steels. Trudy VIAM, 2018, no. 9 (69), paper no. 01. Available at: http://www.viam-works.ru (accessed: November 20, 2019). DOI: 10.18577/2307-6046-2018-0-9-3-11.
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Full version

DOI: 10.18577/2071-9140-2020-0-2-17-24

UDC: 669.721.5

Pages: 17-24

E.N. Kablov1, M.V. Akinina1, E.F. Volkova1, I.V. Mostyaev1, A.A. Leonov1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

THE RESEARCH OF ASPECTS OF PHASE COMPOSITION AND FINE STRUCTURE OF MAGNESIUM ALLOY ML9 IN THE AS-CAST AND HEAT-TREATED CONDITIONS

The paper presents the results of the comparative investigation of microstructure and characteristic features of the phase composition of ML9 high-temperature commercial magnesium alloy in the as-cast and  heat-treated (quenching and further artificial aging) conditions. The features of phase transformations in the structure that occur during the decomposition of a supersaturated solid solution have been examined. The basic mechanical characteristics of ML9 alloy after heat treatment have been determined. There also has been studied the influence of nanoscale precipitates of intermetallic phases rich in neodymium on the strength and plastic characteristics of the alloy.

Keywords: casting magnesium alloys, heat-treatment, microstructure, phase composition, decomposition of solid solution.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-25-31

UDC: 669.018.8

Pages: 25-31

D. Mai Xuan1, A.I. Gnevko1, Yu.A. Puchkov1

[1] Bauman Moscow State Technical University

STUDY OF CRYOGENIC TREATMENT INFLUENCE ON RESIDUAL STRESSES AND PROPERTIES OF D16 ALUMINIUM ALLOY 

The paper presents the results of heat treatment of wrought D16 aluminium alloy including the influence of quenching in water, uphill quenching (cooling in the liquid nitrogen, holding and heating in hot mineral oil) and natural or artificial aging on hardness and corrosion properties of the D16 alloy. The hole-drilling strain-gage method was used to study the effect of heat treatment on the residual stresses hardness and corrosion properties. The acoustic emission method was used to study local corrosion during the anodic polarization. The recommendations concerning the usage of the uphill quenching for reducing the residual stresses and buckling of alloy D16 are given.

Keywords: heat treatment, cryogenic treatment, uphill quenching, aluminum alloys, alloy D16, residual stresses, buckling, mechanical and corrosion properties.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-32-40

UDC: 667.621

Pages: 32-40

A.I. Tkachuk1, I.V. Terekhov1, Ya.M. Gurevich1, A.N. Kudryavtseva1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

APPLICATION OF BISMALEIMIDE VST-57 BINDER FOR OBTAINING HEAT-RESISTANT DIMENSIONALLY STABLE MOLDS FROM POLYMER COMPOSITE MATERIALS

In this paper, we consider the main physicochemical, thermomechanical, and elastic-strength characteristics of the bismaleimide  VST-57 binder developed by FSUE «VIAM» and processed by injection technology. There are presented the results of the study of cured binder castings under aging conditions in the temperature range of 200–300 °C for 500 hours at each temperature;  their heat-resistance and mechanical properties were determined. The kinetic parameters of the curing process were investigated by the DSC method and the optimal step curing mode of the  VST-57 binder was selected. On the manufactured samples of glass and carbon fiber reinforced polymer materials the thermal coefficient of linear expansion was measured in the temperature range from 20 to 250 °C. The carbon fiber reinforced polymer samples underwent thermal cycling (100 cycles at temperature of 50–250 °C) and were tested for their thermal and mechanical characteristics.

Keywords: bismaleimide binder, heat-resistant dimensionally stable molds, glass transition temperature, vacuum infusion technology, carbon and fiberglass reinforced polymer materials.

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    D0%B7%D1%83%D1%8E%D1%89%D0%B8%D0%B5%20%D0%B4%D0%BB%D1%8F%20%D0%9F%D0%9A%D0%9C.pdf (accessed: January14, 2020).
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    21. Zharinov M.A., Shimkin A.A., Akhmadiyeva K.R., Zelenina I.V. Features and properties of solvent-free PMR-type polyimide resin. Trudy VIAM, 2018, no. 12 (72), paper no. 05. Available at: http://www.viam-works.ru (accessed: January 14, 2020). DOI: 10.18577/2307-6046-2018-0-12-46-53.
    22. Muhametov R.R., Dolgova E.V., Merkulova Yu.I., Dushin M.I. Development of heat-resistant bismaleimide binder for composites for aeronautical application. Aviacionnye materialy i tehnologii, 2014, no. 4, pp. 53–57. DOI: 10.18577/2071-9140-2014-0-4-53-57.
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    25. Kablov E.N., Startsev V.O. Systematical analysis of the climatics influence on mechanical properties of the polymer composite materials based on domestic and foreign sources (review). Aviacionnye materialy i tehnologii, 2018, no. 2 (51), pp. 47–58. DOI: 10.18577/2071-9140-2018-0-2-47-58.

Full version

DOI: 10.18577/2071-9140-2020-0-2-41-49

UDC: 628.517.2:699.844

Pages: 41-49

E.N. Kablov1, Е.М. Shuldeshov1, A.P. Petrova1, M.A. Lapteva1, A.E. Sorokin1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

DEPENDENCE OF COMPLEX OF SOUND-PROOF VZMK TYPE MATERIAL PROPERTIES ON CONCENTRATION OF HYDROPHOBIZING COMPOSITION ON THE BASIS OF ORGANOSILICON SEALANT

The article is devoted to the issue of decrease in noise level of air vehicles on the ground. The application option as a part of sound-proof designs of cellular filler with porous insert is offered as a decision of this issue. The article gives the results of the research of physical and acoustic properties of these materials and microstructure and air permeability of porous insert depending on concentration of hydrophobizing composition. The conclusion is drawn about the influence of concentration on all listed properties. There is made an assumption about possibility of varying of acoustic properties when the polymerization rate of the hydrophobizing composition changes.

Keywords: sound-proof material design, hydrophobizing composition, sound absorption coefficient, porosity, microstructure, air permeability.

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    7. Shuldeshova P.M., Deev I.S., Zhelezina G.F. Features of destruction of SVM aramide fibers and structural organoplastics on their basis. Trudy VIAM, 2016, no. 2 (38), paper no. 11. Available at: http://www.viam-works.ru (accessed: October 07, 2019). DOI 10.18577/2307-6046-2016-0-2-11-11.
    8. Shuldeshova P.M., Zhelezina G.F. An influence of atmospheric condition and dust loading on properties of structural organic plastics. Aviacionnye materialy i tehnologii, 2014, no. 1, pp. 64–68. DOI: 10.18577/2071-9140-2014-0-1-64-68.
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Full version

DOI: 10.18577/2071-9140-2020-0-2-50-55

UDC: 629.7.023.224

Pages: 50-55

V.S. Denisova1, O.V. Vlasova1, G.A. Malinina1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

EFFECT OF THE ADDITION OF SILICON TETRABORIDE ON THE THERMAL STABILITY OF REACTION CURED COATINGS

Thermal stability tests of heat-resistant reaction cured coatings based on barium-aluminum silicate glass and silicon tetraboride have been carried out on nickel alloy VZh171. The scanning electron microscopy results show that a dense structure of coatings is formed after thermal exposure that ensures protection of VZh171 alloy. Reaction cured coating with 5% wt. content of silicon tetraboride showed the thermal stability after 127 cycles at 1200↔20°С mode with an optimal coating thickness of 90-120 micron.

Keywords: glass, silicon tetraboride, structure, nickel alloys, reaction cure, thermal resistance.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-56-62

UDC: 66.017:678

Pages: 56-62

V.А. Kuznetsova1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

INFLUENCE OF THE ELASTOMERIC MODIFIER ON MECHANICAL AND VISCOELASTIC PROPERTIES OF EPOXY AND RUBBER COMPOSITIONS FOR EROSION RESISTANT COATINGS

The article describes the study of the influence of the elastomeric modifier of butadiene-acrylonitrile carboxylaled rubber for definition of its optimum content  in film-forming for erosion resistant coating. It is shown that each of the components introduced into epoxy composition contributes to the increase of adhesive durability and erosion resistance of coatings based on epoxy and rubber composition. Viscoelastic properties of the free film obtained on the basis of cured epoxy and rubber composition have been investigated. It has been determined that in diphasic polymeric composition there are two main (α and β) relaxation transitions.

Keywords: epoxy oligomer, the elastomeric modifier, erosion resistance, adhesion strength, tensile strength at break, viscoelastic properties.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-63-73

UDC: 669.017

Pages: 63-73

E.N. Kablov1, V.V. Antipov1, D.V. Chesnokov1, A.E. Kutyrev1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

APPLICATION OF Al–Mg–Si–Cu SYSTEM ALUMINUM ALLOY COMBINED ANODIC DISSOLUTION FOR PROGNOSIS OF TENSILE STRENGTH LOSS DURING NATURAL EXPOSURE TESTING

This article presents the results of the combined anodic dissolution (sequential dissolution in two different electrolytes using different ratios of transferred charge density in solutions) of Al–Mg–Si–Cu system aluminum alloy. Corrosion damages sites were examined by means of  optical and confocal microscopy. The influence of the transferred charge density at different modes on mass loss, pitting corrosion factor, intergranular corrosion depth, tensile strength change was studied. Experimental results were used to derive models for the prognosis of tensile strength loss concerning mass loss during atmospheric corrosion.

Keywords: aluminum alloys, pitting corrosion, intergranular corrosion, anodic dissolution, natural exposure, corrosion prediction.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-74-80

UDC: 620.179

Pages: 74-80

A.S. Boychuk1, I.A. Dikov1, A.S. Generalov1, A.V. Slavin1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

AUTOMATED NON-DESTRUCTIVE INSPECTION OF THREE-LAYER HONEYCOMB STRUCTURES’ SAMPLES BY ULTRASONIC THROUGH-TRANSMISSION TECHNIQUE

The article presents the results of non-destructive inspection of samples of three-layer honeycomb structures made of polymer composite materials with polymer honeycomb cores and aluminum foil cellular cores. It is shown that the automation of ultrasonic through-transmission technique of three-layer honeycomb structures’ samples allows to increase testing sensitivity due to application of water jet method of acoustic contact creation with a small jet’s diameter and observance of accurate alignment of transmitting and receiving transducers. In this case it is possible to check such defects as disbonds, delaminations and outside inclusions in skins with size of more than 6 mm.

Keywords: polymer composite materials, three-layer honeycomb structures’ samples, non-destructive inspection, ultrasonic inspection, through-transmission technique, sensitivity.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-81-88

UDC: 620.17: 629.7.042

Pages: 81-88

P.V. Shershak1, N.O. Yakovlev1, G.I. Shokin1, K.E. Kutsevich1, E.A. Popkova1

[1] Federal state unitary enterprise «All-Russian scientific research institute of aviation materials»

EVALUATION METHOD AND FACTORS INFLUENCING THE BONDING QUALITY BETWEEN FACE AND HONEYCOMB CORES IN FLOOR AND INTERIOR AIRCRAFT PANELS

Absence in the international and national standards requirements for the test methodology for determining the peeling force of the facing (skin) from the honeycomb core for floor and interior panel samples leads to a number of contradictions during testing and interpretation of test results. The article describes in detail the procedure of such tests based on international practice.
The essence of the method, the devices used, the test scheme, the main aspects and nuances of the test, processing of the results and differences in the units used are covered in the article.
The main factors affecting the quality of bonding facing (skin) with honeycomb core are presented. Explanations are given about the reasons and dependencies of their influence on the quality of bonding, taking into account the specific requirements of aircraft developers, imposed on the floor and interior panels.

Keywords: sandwich construction, three-layer honeycomb panel, interior, floor panel, facing, honeycomb core, peeling, climbing drum peel.

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Full version

DOI: 10.18577/2071-9140-2020-0-2-89-94

UDC: 621.369.9

Pages: 89-94

O.V. Boiprav1, V.V. Lobunov1, L.M. Lynkov1, E.A.A. Almashat1

[1] Belarusian State University of Informatics and Radioelectronics

RESEARCH OF INTERACTION OF INFRARED WAVELENGTH RANGE ELECTROMAGNETIC RADIATION WITH RADIO-ABSORBENT MATERIALS BASED ON METAL-CONTAINING ELEMENTS

The article studies the processes of infrared wavelength range electromagnetic radiation interaction with elastic radio-absorbent materials (RAM) characterized by a cellular structure and made on the basis of a metallized polyethylene film and material in the form of foamed polyurethane. Based on the results of the study, it was found that the average surface temperature of the radio-absorbent materials increased by no more than 8°C during their 60-minute interaction with electromagnetic radiation of infrared wavelength range, the temperature of which is 60±2 °C. The obtained results show the experimental justification for the possibility of using the studied elastic radio-absorbent materials to mask ground objects not only in the radar but also in the infrared electromagnetic wavelength ranges.

Keywords: infrared range, wavelength, metallization, radio-absorbent material.

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Full version