Archive - Электронный научный журнал "ТРУДЫ ВИАМ"

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1.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-3-13
УДК 537.621
Morgunov R.B., Valeev R.A., Skvortsov A.A., Korolev D.V., Piskorsky V.P., Kunitsyna E.I., Kucheryaev V.V., Koplak O.V.
Magnetoplastic and magnetomechanic effects in aluminum alloys with magnetostrictive micro inclusions

Effect of magnetic field on mechanical properties of aluminum alloys and magnetic after-effects are discussed. The FeAl microinclusions providing internal stresses in aluminum matrix were revealed. These stresses affect creep, microharness and dislocation dynamics in magnetic field. The opposite effect, which can be called magnetomechanic or piezoelectric, is also repor-ted. It consists in increasing the coercive force of microinclusions caused by plastic deformation of aluminum. These experiments show that microinclusions can be used as sensors of mechanical stresses, with the help of which residual stresses in materials can be measured.

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2.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-14-24
УДК 669.295:669.017
Ospennikova O.G., Naprienko S.A., Medvedev P.N., Krupnina O.A., Rogalev A.M.
Features of the structure of Ti–6Al–4V alloy obtained by selective laser melting

The paper analyzes the structural features of titanium alloy Ti–6Al–4V, obtained by selective laser melting (SLM). By methods of optical and scanning electron microscopy and x-ray diffraction analysis the characteristics of the structural and texture state of the material obtained in the synthesis are revealed. The study of defects characteristic of the titanium alloy obtained by this technology using scanning electron microscopy, x-ray spectral analysis and x-ray tomography was carried out.

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3.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-25-33
УДК 669.295
Shiryaev A.A., Nochovnaya N.A., Pomelnikova A.S.
Effect of isothermal exposures on hardness evolution of high-strength metastable-β-titanium alloy VT47

Rockwell hardness (HRC) studies have been accomplished on samples cut from sheets of metastable-b-titanium alloy VT47 after isothermal exposures (ageing) upon a wide range of temperatures and exposure durations. A diagram and C-shaped alloy hardness curves have been plotted, and a comparative assessment of hardness values with a microstructure was carried out. It has been established that VT47 alloy is hardened significantly (≥40 HRC) by ageing in the temperature range of 400–500°С. The temperature range of 450–500°Сcan be considered to be the most rational from the standpoint of achievable hardness values and required ageing times.

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4.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-34-49
УДК 678.8
Kondrashov S.V., Pykhtin A.A., Larionov S.A., Sorokin A.E.
Influence of the technological FDM-modes of the press and structure of used materials on physic-mechanical characteristics of FDM-models (review)

In work the analysis of scientific and technical literature in the field of influence of technological modes on physic-mechanical properties of the samples received in the way of the FDM press is carried out. It is shown that strength characteristics of the details made with use of optimum parameters of the press, closely come nearer to properties of the products received in the way of pressure casting. Basic approaches for receiving samples with thermal stability more than 200°C and with the durability more than 100 MPa are revealed. The circle of research tasks which need to be solved for transition from prototyping to manufacturing of real details, specific devices and designs is defined.

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5.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-50-60
УДК 629.7.023.224
Movenko D.A., Medvedev P.N.
Microstructure changes during MCrAlY bond coats oxidation (review)

The state of the question of structure changing of MCrAlY bond coats during isothermal oxidation is studied. The influence of coating methods on their structure during long-term oxidation is shown. Criteria for assessing the lifetime of thermal barrier coatings with MCrAlY bond coats are shown. The influence of the composition and morphology of thermally grown oxide on the oxidation intensity of the bond coat and its adhesion to the ceramic layer of the thermal barrier coating are presented.

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6.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-61-75
УДК 620.193
Kurs M.G., Kutyrev A.E., Kirichok P.F., Fomina M.A.
Accelerated and cyclic corrosion tests of aviation materials

The paper presents the results of a study of the dynamics of the development of corrosion damage to aluminum alloy and carbon steel during accelerated tests in a salt fog chamber and cyclic corrosion tests in comparison with data obtained during full-scale exposure of samples in a moderately warm climate. Comparison of the results obtained in terms of mass loss, depth of intergranular and pitting corrosion, changes in the sample thickness, as well as the width of propagation of corrosion from the notch for steel samples with a paint and varnish coating was carried out.

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7.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-76-83
УДК 620.1:669.14
Gulina I.V., Sedov O.V., Yakovlev N.O., Grinevich A.V.
Features of the tested bearing steel

The work deals with the problem of assessing the strength characteristics of bearing steel to determine its performance in the bearing elements. Since most of the performance characteristics of the material in the bearing correlate with the ultimate strength of the material, tensile tests were taken as basic. However, the standard samples was not acceptable to assess the strength of the bearing steel. Specimen failures occurred in the fillets, which are stress concentrators. Completion of the manufactured samples with the formation of the corset working part allowed to determine the ultimate strength of the bearing steel. When testing for quasi-static tension of bearing steel, a two-stage character of the sample failure is established, when a static fracture forms a tensile wave leading to a breakaway.

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8.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-84-94
УДК 669.017
Morozova L.V., Grigorenko V.B., Konyshev D.V., Vlasov A.I.
Reasons for the destruction of separators single-row radial rolling bearing study

This study focuses on topical issues of identifying the causes of failure of single row radial rolling bearings. Considered the cases of destruction of separators of various designs, which led to loss of bearings performance. Methods of metallography and high resolution fractografy investigated the structure and nature of destruction of materials of bearing parts. The main causes of the destruction separators are established: poor-quality assembly and installation of the part in the product assembly and abrasive wear during operation, caused by a lack of lubricant.

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9.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-95-102
УДК 669.017.165
Alekseev A.V., Rastegayeva G.Yu., Pahomkina T.N.
Determination sulfur, carbon, nitrogen and oxygen in alloys of system Pr–Dy–Fe–Co–B and Nd–Dy–Fe–Co–B

In this paper, the alloys of Pr–Dy–Fe–Co–B and Nd–Dy–Fe–Co–B systems were analyzed for the content of gas-forming impurities. The sulfur and carbon content was determined by combustion in the induction furnace of the Leco CS-444 gas analyzer with subsequent detection in the infrared cell of the spectrometer, and for the determination of oxygen and nitrogen, the method of reducing melting in the inert carrier gas current was used, followed by detection of oxygen in the infrared cell and nitrogen in the conductometric cell of the Leco TC-600 gas analyzer. For the complete extraction of the elements to be determined, various catalysts were used – tungsten with tin, vanadium oxide, copper chips and the most suitable one was chosen.

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10.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-103-110
УДК 699.81:678.747.2
Barbotko S.L., Volnyj O.S., Marachovskiy P.C.
Investigation of the influence of the reinforcement scheme on the combustibility characteristics of carbon fiber reinforced polymer material

The influence of the structure of carbon fiber reinforced plastic VKU-25/SYT49S based on the binder VSE-1212 and high-strength carbon harness SYT49S on the flammability characteristics determined in accordance with the requirements of aviation regulations. The significant effect of the scheme of reinforcement on the value of the residual duration of combustion and the length of the burn-out. It is established that in the entire range of the studied material thicknesses (from 1 to 4 mm) the samples of unidirectional material with the orientation of the carbon filler [0] have significantly worse fire safety values compared to the samples with the orientation [90] or with an equally strong material (quasi-isotropic laying).

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11.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-111-124
УДК 620.1
Podzhivotov N.Y.
Express method of a comparative assessment properties levels of materials

The article is about the express method of a comparative assessment of levels properties of materials on experimental data in the conditions of the empirical uncertainty. The choice of a preferential material is carried out by means of comparisons of probabilistic estimates levels of values of materials characteristics with close levels of properties. The method allows to carry out the complex ranging of compared materials on level properties and to reveal the preferential material possessing with the greatest levels of properties. The characteristics of materials on which comparison is carried out, are considered the equivalent for the choice.

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12.
dx.doi.org/ 10.18577/2307-6046-2019-0-10-125-132
УДК 620.1
Gorbovets M.A., Slavin A.V.
The coded marking of specimens for high-temperature tests

The analysis of existing ways of bar code is carried out and opportunity and expediency of their use with reference to test pieces is evaluated. As objects samples for the most demanded tests by determination of physicomechanical properties of metal materials are considered. For identification of metal samples for high-temperature tests by the optimum decision drawing complete (expanded) marking on packaging and the reduced marking on sample end face is. For automation of identification of sample it is reasonable to put shaped coding on sample packaging.

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