APPLICATION OF THE ROTATIONAL FORGING METHOD FOR THE PRODUCTION OF BARS FROM HIGH-NITROGEN STEEL VNS-78

The microstructure and microhardness of bars made of high-nitrogen steel VNS-78 after rotational forging and helical rolling have been studied. It has been established that the use of the rotary forging method, due to the compression scheme used, makes it possible to form a more uniform structure over the volume of the profile compared to helical rolling, as well as to obtain less porosity in the central part of the bar. The implemented scheme of deformation during rotational forging provides a smaller grain size and dispersion of the carbonitride phase, which is primarily required when manufacturing high-quality precision rolling bearings.

Keywords: steels with superequilibrium nitrogen content, high nitrogen steels, rotational forging, helical rolling, structural banding, porosity

Reference List

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Full version

DOI: 10.18577/2713-0193-2022-0-4-16-24

UDC: 669.017

A.V. Sviridov¹, A.N. Afansiev-Khodykin¹, I.A. Galushka¹

INFLUENCE OF MANUFACTURING TECHNOLOGIES OF BRAZING ALLOY POWDER VPr28 ON POWDER FEATURES (review)

The article presents information about main methods of manufacturing titanium-based VPr28 solder powder, such as calcium hydride reduction of oxides, processing of amorphous semi-finished products, crushing of cast semi-finished products, spraying the melt with an inert gas. Technological features and influence on brazing alloy powder, obtained by different methods was considered. Results of comparative researche of technical characteristics and the maintenance of harmful impurity of such powders was showed

Keywords: brazing, high-temperature brazing, titan based brazing alloy, metal-powder compositions, gas atomization, amorphous tapes

Reference List

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Full version

DOI: 10.18577/2713-0193-2022-0-4-25-35

UDC: 669.018.292

M.D. Panteleev¹, A.V. Sviridov¹, A.A. Skupov¹, N.S. Odintsov¹

ALUMINUM-LITHIUM ALLOY V-1469 WELDED FUSELAGE CONSTRUCTIONS SURVIVABILITY

In this work static and fatigue characteristics of welded joints of high-strength aluminum alloy B-1469 have been explored. Mechanical and service-life tests of flat welded structurally similar samples of fuselage elements made of aluminum-lithium alloy V-1469 performed by laser-beam welding and friction stir welding have been carried out. The survivability of welded joints was evaluated with introduced stress concentrators. A comparative assessment of the cyclic durability to failure on welded structurally similar samples made with and without incision showed that the values of the low-cycle fatigue were significantly reduced, which indicate a high sensitivity of welded joints made of aluminum-lithium alloy V-1469 to stress concentrators.

Keywords: laser welding, fuselage panel, aluminum alloy, aluminum-lithium alloy, microstructure, mechanical properties

Reference List

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Full version

DOI: 10.18577/2713-0193-2022-0-4-36-50

UDC: 669.721.5

M.V. Akinina¹, I.V. Mostyaev¹, E.F. Volkova¹, A.A. Alikhanyan¹

COMPARATIVE STUDIES OF THE STRUCTURE, FEATURES OF THE PHASE COMPOSITION AND MECHANICAL PROPERTIES OF DEFORMED SEMI-FINISHED PRODUCTS FROM VMD16 MAGNESIUM ALLOY

The article presents the results of comparative studies of the structure, features of the phase composition and mechanical properties of deformed semi-finished products from the VMD16 magnesium alloy. It is analyzed that an increase of the strength and plastic characteristics of deformed semi-finished products from the VMD16 alloy, as well as an effective decrease of their anisotropy, can also be caused by the formation of a fine-grained structure and features of the phase composition, including the presence of nanoscale plates of LPSO-phases. It is shown that LPSO-phases are found in the cast, heat-treated (homogenized), and deformed states of VMD16 alloy.

Keywords: magnesium alloy, wrought alloy, microstructure, phase composition, LPSO-phases, anisotropy, stamping

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Full version

DOI: 10.18577/2713-0193-2022-0-4-51-60

UDC: 699.81

A.Ch. Kan¹, G.F. Zhelezina¹, G.S. Kulagina¹, T.R. Ayupov¹

FIRE SAFETY OF STRUCTURAL ORGANIC PLASTICS REINFORCED WITH ARAMID FABRICS

The influence of the composition and structure of aramid organic plastics on the resistance to combustion is investigated. It is established that the reinforcing fabric of aramid fibers belongs to the category of self-extinguishing materials, the resistance of structural organic plastics to combustion depends mainly on the type of binder used in their composition, as well as on the thickness of the tested samples, which indicates the possibility of further improvement of aviation organic plastics in terms of resistance to combustion in order to meet the ever-increasing demands on modern technology.

Keywords: structural organic plastics, aramid fabrics, fire safety, combustion

Reference List

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16. Shuldeshov E.M., Kraev I.D., Obraztsova E.P. Materials for sound-proof designs of aircraft engines (review). Trudy VIAM, 2021, no. 7 (101), paper no. 07. Available at: http://www.viam-works.ru (accessed: December 20, 2021). DOI: 10.18577/2307-6046-2021-0-7-59-72.

Full version

DOI: 10.18577/2713-0193-2022-0-4-61-71

UDC: 621.357.74

L.I. Zakirova¹, A.N. Afanasyev-Khodykin¹, D.A. Movenko¹, A.B. Laptev¹

FEATURES OF THE FORMATION OF THE Sn–Zn–Fe DIFFUSION LAYER AT THE BORDER OF GALVANOTHERMAL COATING OF SYSTEMS ZINC–TIN AND 30HGSA STEEL WITH HIGH PROTECTIVE CAPABILITY

The results of experimental studies of the diffusion layer at the «coating–substrate» interface of two-layer Zn–Sn electrolytic coatings on steel in initial state and after thermal exposure of various durations are presented. The depth of the diffusion layer and, consequently, the concentration of embedded zinc and tin atoms strongly depends on the holding time during heat treatment at a temperature of 210 °C. It is shown that with increasing exposure time, the diffusion coefficient of Zn and Sn in the diffusion layer decreases, and corrosion resistance and protective ability increase.

Keywords: galvanothermal coating, heat treatment, Sn–Zn–Fe diffusion layer, diffusion coefficient, protective ability, 30HGSA steel

Reference List

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Full version

DOI: 10.18577/2713-0193-2022-0-4-72-83

UDC: 66.017

A.A. Kozlova¹, O.V. Kondrateva¹, V.A. Kuznetsova¹

THE MAIN PROBLEMS OF USING DOMESTICALLY PRODUCED MOISTURE-PROOF ELECTRICAL INSULATING MATERIALS FOR AUTOMATED SELECTIVE APPLICATION ON PRINTED BOARD ASSEMBLIES (review)

The analysis of publications devoted to the development of electrical insulating moisture-protective coatings has been carried out. The brands of domestic and imported moisture-proof varnishes used at the enterprises of the industry are given, as well as the main problems arising during their use in automatic application systems are considered. The characteristics of used domestic and import moisture protective varnishes, their advantages and disadvantages, the requirements to the technological characteristics of varnishes determining the possibility of their use in automatic systems for selective application have been given.

Keywords: moisture-proof coatings, electrical insulating varnishes, electronic products, automation, selective application, UV-curing, conformal coating

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Full version

DOI: 10.18577/2713-0193-2022-0-4-84-95

UDC: 620.1

V.P. Rudnev¹, I.V. Mekalina²

PROPERTIES OF ORGANIC GLASSES AFTER NATURAL AGING UNDER LOAD IN HUMID SUBTROPICS

Climatic aging of polymeric materials in a stressed state is of particular interest for materials science. This type of testing more realistically reflects the operating conditions of materials in products. Mechanical properties of aviation glazing materials are presented after exposure in natural conditions of humid subtropics with simultaneous exposure to bending loads of the operational level.

Keywords: organic glasses, static loads, climatic aging, mechanical properties

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26. Asklyin S.V., Frolkov F.I. Recovery of heat-resistant aviation glazing. Aviatsionnaya promyshlennost, 2014, no. 1, pp. 41–44.
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28. Startsev O.V., Lebedev M.P., Slavin A.V., Noev I.I. Fracture mechanics of inhomogeneously aging polymeric materials. Doklady Akademii nauk, 2018, vol. 483, no. 5, pp. 522–527.

Full version

DOI: 10.18577/2713-0193-2022-0-4-96-111

UDC: 620.178.3:539.389:544.015.4

V.I. Kapustin¹, K.V. Zakharchenko², V.K. Cherepanova³, V.R. Shayapov⁴

INVESTIGATION OF DISSIPATIVE PROCESSES OF VT6 ALLOY UNDER FATIGUE

The article is devoted to the experimental study of dissipative properties of the VT6 alloy (Ti–6Al–4V) under conditions of a homogeneous stress-strain state, which is realized on the working part of a smooth sample subjected to cyclic loading with increasing amplitude. The effects of inelastic deformation occurring in a material under cyclic loading are considered from the standpoint of thermodynamics. The research technique allows detecting irreversible changes in the thermodynamic characteristics of the sample at an early stage and determining critical stresses at which a sharp change in the derivatives of the Gibbs potential occurs. The thermodynamic approach allowed us to hypothesize the connection of critical stresses with the points of phase transitions of the material under load.

Keywords: elastoplastic strain, strain characteristics, thermoelastic and dissipative heating, structure, phase composition

Reference List

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Full version

10.

DOI: 10.18577/2713-0193-2022-0-4-112-122

UDC: 669.017

L.V. Morozova¹, A.A. Levchenko¹

RESEARCH OF BIMETALLIC HOLDERS OF GENERATOR ROTOR AFTER OPERATION

Complex research of three holders of generator rotor, made of 35KhGSL steel with inserts of MnMts60-20-20 cupronickel is conducted after operation and additional tests in humid environment and elevated temperature conditions. Chemical composition and structure of parts fatigue has been studied and macro- and microstructure has been evaluated by the methods of optical and electron microscopy, chemical analysis and non-destructive testing. It is established that the operation of generator rotor holders under conditions of high temperature and humidity leads to delamination of protective nickel coating and formation of petting corrosion on the steel sections. Operation in an environment containing sulfur leads to the initiation of cracks and the development of intercrystallite corrosion.

Keywords: fractography, crack, holder, steel, cupronickel, hostile environment, protective coating

Reference List

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14. Kuznetsova V.A., Deev I.S., Zheleznyak V.G., Silaeva A.A. Anti wear coating with quasicrystal filler. Trudy VIAM, 2018, no. 3 (63), paper no. 08. Available at: http://www.viam-works.ru (accessed: February 18, 2022). DOI: 10.18577/2307-6046-2018-0-3-68-76.
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11.

DOI: 10.18577/2713-0193-2022-0-4-123-131

UDC: 536.65

D.V. Seleznev¹, Yu.M. Kozhevnikova¹, I.A. Belobrova¹, R.R. Ishuzhin¹, V.V. Tashlanov¹

METHOD FOR DETERMINING THE ENTHALPY OF ENDO- AND EXOTHERMIC EFFECTS IN COMPOSITE PHASE-CHANGE MATERIALS BASED ON DSC-RESEARCH

The composite phase-change material TAM-IGI-2 (TS 752.013–2018) has been studied by the method of differential scanning calorimetry (DSC). Regularities and features of the processes occurring in the TAM-IGI-2 material during the “melting–crystallization” phase change are revealed. Using the example of DSC-research of the TAM-IGI-2 material the method for determining the parameters necessary for designing an adequate mathematical thermal model of the behavior of composite phase change materials has been developed for determining.

Keywords: differential scanning calorimetry, composite phase-change material, mathematical thermal model, enthalpy

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Full version

12.

DOI: 10.18577/2713-0193-2022-0-4-132-146

UDC: 004.021

E.I. Oreshko¹, V.S. Erasov¹, I.G. Sibayev¹, A.N. Lutsenko¹, P.V. Shershak¹

MACHINE LEARNING ALGORITHMS (review) Part 2. Machine learning metrics. Decision trees and ensembles of decision trees. An algorithm for neural network to forecast properties of ferrite-martensite steel

In the review were analyzed key machine learning algorithms for solution of material science tasks, which include predicting properties of materials by varying its composition and means of external impact using neural network programming. These algorithms include: the nearest neighbor method, decision tree, decision forest, gradient boosting, artificial neural networks. The features of the use of decision trees and their ensembles in classification

Keywords: material property forecasting, «composition–property» dependence, machine learning, neural network, sigmoidal function, decision trees, approximation, calculation, stresses, deformation

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Full version

Aviation materials and technologies

Scientific-technical journal ISSN 2713-0193

ARCHIVE

Aviation materials and technologies №4, 2022

Contents

Heat-resistant alloys and steels

Light-metal alloys

Composite materials

Protective and functional coatings

Material tests

APPLICATION OF THE ROTATIONAL FORGING METHOD FOR THE PRODUCTION OF BARS FROM HIGH-NITROGEN STEEL VNS-78

INFLUENCE OF MANUFACTURING TECHNOLOGIES OF BRAZING ALLOY POWDER VPr28 ON POWDER FEATURES (review)

ALUMINUM-LITHIUM ALLOY V-1469 WELDED FUSELAGE CONSTRUCTIONS SURVIVABILITY

COMPARATIVE STUDIES OF THE STRUCTURE, FEATURES OF THE PHASE COMPOSITION AND MECHANICAL PROPERTIES OF DEFORMED SEMI-FINISHED PRODUCTS FROM VMD16 MAGNESIUM ALLOY

FIRE SAFETY OF STRUCTURAL ORGANIC PLASTICS REINFORCED WITH ARAMID FABRICS

FEATURES OF THE FORMATION OF THE Sn–Zn–Fe DIFFUSION LAYER AT THE BORDER OF GALVANOTHERMAL COATING OF SYSTEMS ZINC–TIN AND 30HGSA STEEL WITH HIGH PROTECTIVE CAPABILITY

THE MAIN PROBLEMS OF USING DOMESTICALLY PRODUCED MOISTURE-PROOF ELECTRICAL INSULATING MATERIALS FOR AUTOMATED SELECTIVE APPLICATION ON PRINTED BOARD ASSEMBLIES (review)

PROPERTIES OF ORGANIC GLASSES AFTER NATURAL AGING UNDER LOAD IN HUMID SUBTROPICS

INVESTIGATION OF DISSIPATIVE PROCESSES OF VT6 ALLOY UNDER FATIGUE

RESEARCH OF BIMETALLIC HOLDERS OF GENERATOR ROTOR AFTER OPERATION

METHOD FOR DETERMINING THE ENTHALPY OF ENDO- AND EXOTHERMIC EFFECTS IN COMPOSITE PHASE-CHANGE MATERIALS BASED ON DSC-RESEARCH

MACHINE LEARNING ALGORITHMS (review) Part 2. Machine learning metrics. Decision trees and ensembles of decision trees. An algorithm for neural network to forecast properties of ferrite-martensite steel