Archive - Электронный научный журнал "ТРУДЫ ВИАМ"

Articles

 


№1 | №2 | №3 | №4 | №5 | №6 | №7 | №8 | №9 | №10 | №11 | №12





1.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-3-9
УДК 669.715
Kuznetsov A.O., Oglodkov M.S., Klimkina A.A.
The influence of chemical composition on structure and properties of Al–Mg–Si alloy

The analysis of Russian and foreign literature in aluminum high-end corrosion resistant alloys area was made. Base ways of development of these alloys are stated. Estimation of modern investigation level was made. The influence of alloying elements additions on microstructure, mechanical and fatique properties of Al–Mg–Si alloy was investigated. It was found that Ti and Zr gaves a positive effect for microstructure and mechanical properties.

Read in Russian

2.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-10-24
УДК 66.017
Antipov V.V., Petrova A.P., Kozlov I.A., Fomina M.A., Volkov I.A.
Influence of technological heatings and ways of surface preparation under pasting on mechanical properties of aluminum foil from alloy AMg2N

Despite keen interest of designers in polymeric composite materials (PСM), aluminum alloys are the base constructional material of the aviation industry. The special attention is given to designs with high specific mechanical properties which treats aluminum cellular fillers. In work will mention question of protection of such materials from corrosion and giving of their surface of special properties with use of different ways of processing (pikling-process, sedimentation titanium oxide, sedimentation of aluminum oxide, MDO (micro-arc oxidation), chemical oxidation). Comprehensive researches of aluminum foil are conducted and the most effective ways of surface preparation are chosen.

Read in Russian

3.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-25-32
УДК 621.74.045
Pentuykhin S.I., Trapeznikov A.V., Vlasova K.A., Klyukvina T.D.
Determination of optimal manufacturing technology of casting alloy AK7ch. with using of ceramic molds

This work is devoted to the determination of the optimal technology for manufacturing castings from the АК7ч. alloy (Al–Si systems) by the method of investment casting. Data on the capabilities of the investment casting method are given. The data on the basic requirements for the ceramic shell, as well as the method of its production and application, are presented. An experiment was conducted to determine the required number of layers of ceramic coating for aluminum castings of various configurations. On the basis of the analysis of the results of the work, the optimal number of applied layers was chosen for the production of model blocks and the method of shell molding.

Read in Russian

4.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-33-40
УДК 669.14.018.8:669.715
Levchuk V.V., Trapeznikov A.V., Pentuykhin S.I.
Corrosion-resistant foundry aluminum alloys (review)

Corrosion-resistant cast aluminum alloys are considered in the article. The information about their mechanical characteristics and properties is given. The article presents the results of experiments that were carried out with cast aluminum alloys with different magnesium content and additional alloying elements for corrosion resistance and their behavior in an aggressive environment. Advantages, disadvantages and peculiarities of already existing alloys are described, as well as ways to improve alloys. The problem of the low operating temperature of existing corrosion-resistant aluminum casting alloys is especially actual.

Read in Russian

5.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-41-48
УДК 669.721.5
Mostyaev I.V., Akinina M.V.
Features and development trends in the field of heat treatment of magnesium alloys (review)

The paper presents the review of the technical level and development trends in the field of heat treatment of magnesium alloys is presented. It is shown that new magnesium alloys containing elements from the REE group are being developed, and the foundations of new technologies for their manufacture are being created, while the mechanism of the effect of heat treatment on the structure and strength properties of alloys is widely used. The dependence of the increase in the characteristics of magnesium alloys on the composition of a particular alloy with the application of certain heat treatment regimes is given.

Read in Russian

6.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-49-57
УДК 669.295
Panin P.V., Lukinа E.A., Alexeev E.B.
Effect of hydrogen doping on structure and phase composition of sheet semi-products of VT23 titanium alloy

The influence of extra hydrogen doping on phase and structural transformations in high-strength VT23 alloy has been studied. The volume ratios of α- and β-phases have been defined for room temperature state in dependence on hydrogen amount and hydrogenating annealing temperature in the range from 650 to 800°C. A quantitative estimation of β-phase content and α-particles dimensions in VT23 alloy have been evaluated with hydrogenation parameters being in focus. It has been shown that the alloy contains approximately 30% (vol.) of β-phase in initial condition. Doping with 0,1% (wt.) of hydrogen results in β-phase volume fraction increase from 50% after hydrogenation at 650°C to 80% after hydrogenation at 800°C. The dimensions of α-particles within the mentioned conditions change from 0,6–1,2 to 1,8–2,2 µm.

Read in Russian

7.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-58-68
УДК 669.295
Panin P.V., Dzunovich D.А., Lukinа E.A.
Effect of hydrogen doping on processing ductility and texture of sheet semi-products of VT23 titanium alloy

The influence of extra hydrogen doping on processing ductility and crystallographic texture in high-strength VT23 alloy (Ti–4,5Al–4,0V–1,8Mo–0,86Cr–0,44Fe, % (wt.)) has been studied. The optimal hydrogenating annealing parameters have been developed for 1,8 mm thickness sheet semi-products (doping with 0,1% H (wt.) at a temperature of 750°C), which are favorable for room temperature processing ductility increase and achievement of the following ultimate tensile strength values: 1050 MPa for the rolling direction, and 1110 MPa for the transverse direction. It has been shown that hydrogenation causes no effect on texture type which had formed on the sheets production stage. The higher strength values in transverse direction are accounted for the location of basal planes {00.2} wherein sliding is difficult.

Read in Russian

8.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-69-77
УДК 669.018.95
Bolsunovskaya T.A., Efimochkin I.Yu., Sevostyanov N.V., Burkovskaya N.P.
The graphite grades lubrication effect on tribotechnical properties of the metallic composite material

The effect of different graphite grades in the copper-based metallic composite material on its tribotechnical properties is considered. Graphites were used as a solid lubricant with different crystal structure: synthetic, coarse-grained and fine-crystalline sintered, and finely dispersed colloidal. Tribotechnical tests data, according to the «finger–disk» testing scheme, have determined the influence of various sliding speeds and contact loading on the wear and friction coefficient depending on the graphite grades in composite material. It was shown that the tested graphite grades possess different tribotechnical properties associated with its manufacturing, dispersion and grain fineness.

Read in Russian

9.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-78-87
УДК 678.067.5
Kondrashov S.V., Solovyanchik L.V., Melnikov A.A., Dyachkova T.P., Bouznik V.M.
Hybrid composite fiberglass for shielding of electromagnetic radiation of ultrahigh frequencies

Hybrid GFRPs based on epoxy binder modified with carboxy-functionalized carbon nanotubes (CNTs) were synthesized, with CNT content in the 1–8% range. The structure of nanocomposites and their electrical properties and electromagnetic shielding performance in cm wavelength range were investigated. It was found that electrodynamic properties of the nanocomposites depend strongly on the thermal treatment conditions. These CNT-nanocomposites can be used as shielding materials for electromagnetic compatibility applica-tions.

Read in Russian

10.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-88-95
УДК 620.1:678.026
Alifanov E.V., Chaykun A.М., Gorlov D.S., Venediktova M.A.
Friction coefficient of the alkyd coverings with abrasive fillers in dry condition and in water

In article results of research of tribological properties of model systems of nonskid coatings based on one-component alkyd binding filled with a sand and an electrocorundum of different fractional structure. In work values of friction coefficient of the specified model systems, as are given in dry condition, and «drowned» in water. Submitted data can be used when developing nonskid coatings which are actively applied, both in the aviation industry, and in other spheres of national economy. Importance of assessment of tribological characteristics of systems in presence of water is defined by that the greatest danger to the personnel at operation of different objects is represented by wet surfaces, both after rain, and after spill of different liquids among which aqueous solutions and suspensions are the most widespread. In work attempt to explain the received results from the point of view of modern tribological theories is made.

Read in Russian

11.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-96-105
УДК 620.193.21
Varchenko E.A., Kurs M.G.
Crevice corrosion of aluminum alloys and stainless steel in marine water

The results of a study of the susceptibility to crevice corrosion of aluminum alloys AMg6, D16-T and stainless steel 08X17 in tests in the natural sea water of the Black Sea are presented. The estimation of changes in appearance of samples, metallographic analysis and estimation of the degree of biofouling is carried out. Physico-chemical indicators of sea water, including those determined by capillary electrophoresis, are presented. The analysis of corrosion resistance tests in seawater, the features of the methodology for slit corrosion testing, and the mechanism of crevice corrosion formation are presented.

Read in Russian

12.
dx.doi.org/ 10.18577/2307-6046-2018-0-7-106-116
УДК 620.193:669.175
Kirichok P.F.
Corrosion cracking of aluminum alloys and stainless steels: key features and test methods (review)

Aggressive environments that lead to the occurrence of corrosion lesions of structures lead to significant changes in their mechanical characteristics and lead to a significant reduction in their bearing capacity and a decrease in durability. The danger of aggressive media exposure to highly loaded material is also due to the fact that in some cases the structural elements fail in a very short time, including with an emergency outcome. In the present work, the literature data, normative documentation and studies on the stress-corrosion cracking and loading methods of the test samples during the tests are analyzed. Particular attention is paid to tests with constant deformation, as the most common and least expensive test group and testing of samples under constant load. Recommendations are given on the timing of testing for stress-corrosion cracking of various metals and alloys.

Read in Russian