Archive - Электронный научный журнал "ТРУДЫ ВИАМ"

Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-3-10
УДК 669.018.44:669.245
Lomberg B.S., Shestakova A.A., Letnikov M.N., Bakradze M.M.
The influence of temperature and stresses on nature of nanosize γʹ-phase in Ni-base superalloy VZh175-ID

The investigation of the stability of nano-sized γʹ-phase particles in cast-and-wrought Ni-base Superalloy VZh175-ID are presented. It was carried out after tension testing at room temperature, after rupture strength testing at the maximum working temperature and stresses and also after rupture strength testing at regimes, which are distinctive for the real parts of high pressure turbine. The contribution of grain-boundary particles γ'-phase with size below 100 nm in the strengthening mechanism was shown for cast-and-wrought Ni-base Superalloy VZh175-ID at high temperatures.

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2.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-11-19
УДК 669.245
Kuzmina N.A., Pyankova L.A.
Control of crystallographic orientation of monocrystalline nickel castings heat-resistant alloys by X-ray diffractometry

The article analyzes the methods of x-ray diffraction used to assess the quality of the structure of single-crystal castings of heat-resistant nickel alloys. The results of determination of crystallographic orientation of single crystals of nickel heat-resistant alloys obtained on an x-ray diffractometer equipped with a curved position-sensitive detector are presented. The data of optimal shooting conditions for obtaining a «swing» curve in order to control the crystallographic orientation of single-crystal castings are presented.

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3.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-20-28
УДК 669.018.44
Rassokhina L.I., Bityutskaya O.N., Gamazina M.V., Echin A.B.
Technological process development of casting details «diffuser» for gas turbine engines from VZh159 superalloy in the conditions of the machine-building enterprise

The results of development the technological process of obtaining casting parts «diffuser» for gas turbine engines in the conditions of machine-building enterprise are presented. Nondestructive testing was carried out to identify metallurgical defects on castings, and tensile and long – term strength tests were carried out to determine mechanical properties. The conclusion is made that the fulfilled technological process of casting of shaped parts from VZh159 superalloy allows to recommend it to serial production for production of shaped castings of details of aircraft engines.

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4.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-29-36
УДК 678.741:536.485
Kablov E.N., Semenova S.N., Suleymanov R.R., Chaykun A.М.
Prospects for the use of ethylene-propylene-diene rubber as part of cold resistant rubber

The ethylene-propylene-diene rubber (SKEPT-40) was investigated as the main component in the cold-resistant rubber. The optimal vulcanizing system and the ways to improve the cold-resistant indicators by adding the paraffin plasticizer and by combination with polybutadiene (SKD-N) and silicone rubber (SKTFV-803) are developed. The advantages of the investigated rubbers in comparison with the cold-resistant sealing rubber IRP-1375 containing ethylene-propylene rubber are shown. The ways to further improve the cold-resistant performance of rubbers based on ethylene-propylene-diene rubbers are proposed.

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5.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-37-45
УДК 629.517:699.844
Shuldeshov Е.М.
Sound-proof properties of aviation heatsound-proof materials

Article is devoted to questions of decrease in negative noise and temperature impact on the person in crew cockpits and salons of flight vehicles. Properties of heatsound-proof materials are provided. The special attention is given to questions of increase of sound-proof properties of materials and options of their increase. It is shown that cellular materials on sound-proof properties exceed analogs of fibrous type. Options of increase of sound insulation of fibrous materials at the expense of change of structure of material, and also addition of layers with bigger density and smaller porosity are considered.

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6.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-46-54
УДК 667.621
Khaskov M.A., Safronov E.V.
The optimization of thermosetting matrixes curing schedule on the example of complex shape sample

The finite difference and finite elements methods are regarded for mathematic simulation of thermoset curing processes on the example of epoxy resin and amine hardener. The finite difference method was used to simulation of flat layer curing and simultaneous solution of heat transfer and chemical interaction problem. The finite element method was used for simultaneous three-dimensional numerical solution of heat transfer, chemical interaction and stress-strain problems during curing of complex-shape samples. The verified kinetics model obtained from differential scanning calorimetry was used. The literature data of the parameters of heat transfer, chemical shrinkage and thermal expansion were used for calculations.

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7.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-55-66
УДК 669.018.95
Karashaev M.M., Lomberg B.S., Bakradze M.M., Letnikov M.N.
On technological approaches to the creation of composite materials based on nickel monoaluminide NiAl (review)

 

The article discusses the main technological features of the formation of natural and artificial composite structures based on NiAl compound. It is shown that this kind of materials can be obtained by directional crystallization methods and by technology, including thermomechanical processing, as well as using mechanical activation methods followed by controlled reaction synthesis, forced and reaction infiltration with a matrix-forming melt, and deformation-diffusion solid-phase combination. Some experimental and theoretical calculations based on multicomponent phase diagrams that allow the creation of such materials using the above methods are presented and generalized. Based on the data obtained conclusions are drawn about further paths in the development and creation of materials based on nickel monoaluminide NiAl.

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8.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-67-79
УДК 678.747.2
Valueva M.I., Zelenina I.V., Zharinov M.A., Akhmadieva K.R.
World market of high temperature polyimide carbon plastic (review)

The article provides an overview of scientific and technical information in the field of high-temperature carbon plastics based on currently manufactured thermosetting binders with imide cycles and continuous carbon reinforcing fillers: comparative information on the assortment and properties of materials from various manufacturers, advantages and disadvantages, directions of application, an overview of developments and prospects for the development of work in the field of high-temperature carbon plastics at FSUE «VIAM».

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9.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-80-87
УДК 621.357.7
Salakhova R.K., Tihobrazov A.B., Smirnova T.B.
On the process of electrochemical copper during repair of parts from titanium alloys

The process of thick-layer electrochemical copper plating of VT6 titanium alloy has been tested as an alternative to the traditionally used chromium repair technology for restoring the geometric dimensions of worn parts. A method is presented for preparing the surface of titanium alloys for the deposition of a copper coating and the results of a study of the properties of a copper coating with a thickness of more than 100 μm obtained from a copper-plating pyrophosphate electrolyte based on potassium pyrophosphate. The adhesion strength of a copper coating with a titanium substrate is compared with a standard chromium coating.

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10.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-88-98
УДК 543.6
Dvoretskov R.M., Uridiya Z.P., Karachevtsev F.N., Zagvozdkina T.N.
Determination of the chemical composition of magnesium alloys by the atomic emission spectrometry with inductively coupled plasma

Analysis technique is proposed for determining alloying elements (Al, Mn, Zn, In, Cd, Li, Bi, Zr, Nb) by atomic emission spectrometry with inductively coupled plasma in magnesium alloys. Analytical lines of elements free from significant spectral overlays were selected. The limits of the determination of elements are estimated. The efficiency of using the spectral lines of scandium, rhodium, and barium as elements for internal standardization under conditions of changing plasma power, argon spray flow, and solution feed rate into the spray chamber is studied. Barium is selected as the preferable internal standard. The metrological characteristics of the method using model solutions were evaluated. The correctness of the developed method was verified using standard samples of magnesium alloys and the «entered-found» way.

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11.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-99-108
УДК 620.1:678.747.2
Gulyaev A.I., Yakovlev N.O., Oreshko E.I.
Fractography features of interlaminar crack growth in carbon fibre reinforced plastic under various mode loading

The interlaminar fracture toughness characteristics were experimentally determined under conditions of opening (mode I), forward shear (mode II), and combined loading (at various opening and shear ratios) of unidirectional epoxy polysulfone carbon fiber reinforced plastic. Based on the results of fractographic analysis, the fracture microrelief characteristic elements are identified and the change in the microstructure of the fracture surfaces with changing loading conditions is presented. A scheme is proposed for the formation of a shear microrelief for carbon fiber polymer composite with a matrix continuous phase morphology.

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12.
dx.doi.org/ 10.18577/2307-6046-2019-0-12-109-118
УДК 66.045.3:678.6
Zuev A.V., Zarichnyak Yu.P., Razmakhov M.G.
Prerequisites for the selection of the structure model of highly porous fibrous materials to take into account the influence of technological factors and the calculation of heat transfer

The prerequisites for selecting and constructing a model of the structure of a highly porous fibrous material used as the main component of thermal protection, including on the outer surface of high-speed aircraft, are considered. The possibility is shown through the model of the structure of taking into account the influence of technological parameters on thermal conductivity by the example of forming a semi-finished product of highly porous fibrous material with unfixed contacts.

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