Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-1-1
УДК 669.018.44:669.245
Ospennikova O.G., Min P.G., Vadeev V.E., Kalitsev V.A., Kramer V.V.
Resource-saving processing technology of off-grade scrap of wrought superalloy VG175 for GTE disks production

The resource-saving production technology of wrought superalloy VG175 for gas-turbine disks with use up to 100% scrap, including off-grade scrap, has been developed in VIAM. This technology allows manufacturing metal, which is not worse than the alloy made from pure charge materials in such parameters as the content of alloying elements, impurities and mechanical properties. The cost of the alloy produced with use up to 100% scrap, including off-grade scrap, is 20–30% lower in comparison with the alloy produced in accordance with the industrial technology with utilization up to 50% specification scrap.

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2.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-2-2
УДК 669.1
Paderin S.N., Burtsev V.T., Anuchkin S.N., Sisyov А.А., Kalitsev V.A., Shcherbakov A.I., Mosolov A.N.
Features of ellinvar alloys deoxidation

An ingenious method for calculating the thermodynamic models for liquid metal solutions of multicomponent systems based on iron and nickel, as well as ellinvar alloy is proposed. Calculation of activity and the oxygen content in ellinvar alloy and deoxidation power of aluminum, cerium and lanthanum is determined using equations and models of regular and pseudoregular solutions. When melting the base model ellinvar alloy the content of oxygen and nitrogen is determined by the gas analysis methods. Oxygen activity is investigated by the EMF method (аO), the morphology and composition of non-metallic inclusions are studied by metalography and SEM and the benefits of Al, Ti introduction into the melt to reduce the аO and nonmetallic inclusions, comprising predominantly Ti and O2, N and S with the size 5–10 microns is shown.

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3.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-3-3
УДК 620.165.79
Naprienko S.A., Orlov M.R.
Damage of single-crystal turbine blades of GTP

Fractures of single-crystal turbine blades of GTP of alloys GS26-VI and GS32-VI after operating damage were analyzed to identify fracture mechanism. Single-crystal samples of alloy GS32-VI were tested under short-term loading and creep at temperature of 570°С, which corresponded to working conditions of blade tails, to confirm the fracture mechanism.

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4.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-4-4
УДК 629.7.023.224:621.357
Popova S.V., Muboyadzhyan S.A., Budinovskiy S.A., Dobrynin D.A.
The feature of electrolytic plasma etching of heat resistant coatings from parts surface of high-temperature nickel alloys

The article is considering the process of coating removal from the surface of complicated profile parts of high-temperature nickel alloys in plasma of electrolyte which is a neutral low concentration solution. Electrolytic plasma treatment is performed through the cathodic polarization of the treated part to avoid over echting of the base. The characteristic curve of the uniformity and velocity of the coating removal on electrolyte composition and processing optionssuch as voltage, temperature, ratio between period of direct current pulse packet and spacing interval is studied.

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5.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-5-5
УДК 669.295.615.46
Panin P.V., Dzunovich D.А., Alexeev E.B.
Phase composition and structure of hydrogenated titanium alloy VT6 after vacuum annealing

Phase composition and structure analyses have been carried out on hydrogenated samples of VT6 (Ti–6,25Al–4,1V, wt.%) titanium alloy after low-temperature vacuum annealing. It has been shown that nanoscale α-phase particles can precipitate in (α+β)-structure upon low-temperature vacuum annealing if preceding hydrogenation process was ended in β-area and as a result a single β-phase structure was kinetically achieved at room temperature.

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6.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-6-6
УДК 678.8
Khrulkov A.V., Grigoriev M.M., Yazvenko L.N.
Prospects of non-autoclave technologies for structural materials manufacturing (review)

The use of polymer composite materials is becoming increasingly wide spread. Non-autoclave technology has a very high level of attractiveness, as they allow to avoid the use of expensive equipment while ensuring the required level of properties. Global trends in the development of aviation industry show that the non-autoclave technology will be used in the manufacture of structures for UAVs, missiles, commercial and general aviation.

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7.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-7-7
УДК 678.8
Veshkin E.A
Features of out-of-autoclave forming of poor-porous PCM

Methods of decrease in porosity in PCM manufactured by vacuum molding are considered. Technological properties of epoxy binder and prepreg on its basis are studied with the use of instruments of Brookfield Cap 2000+, DSC 204F1 and IAP 2003. On the basis of these studies parameters of technological mode of curing of PCM are selected. The study of the mechanical properties of fiberglass is carried out on testing machine Zwick/Roell Z050.

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8.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-8-8
УДК 678.747.2
Zelenina I.V., Gulyaev I.N., Kucherovsky A.I., Mukhametov R.R.
Heat-resistant CFRP for the impulse wheel of the centrifugal compressor

Heat-resistant CFRP VKU-38ZhN and VKU-38TR on the basis of phthalonitrile binder VSN-31 for elements of the impulse wheel of the centrifugal compressor are considered. High level of preservation of the elastic and strength properties of CFRP is shown at temperatures of 300 and 350°С. The analysis of test results of CFRP after the effect of heat-moisture conditions and heat aging shows that CFRP VKU-38ZhN and VKU-38TR possess high stability to heat-moisture as 74–100% preservation of properties in comparison with initial data at different temperatures of tests and can work for a long time at temperature of 200°С, 1000 h at temperature of 300°С and for a short time (during 200 h) at temperature of 330°С. The complex of the received properties of CFRP VKU-38TR and VKU-38ZhN allows recommending them as structural materials for products of aviation engineering.

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9.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-9-9
УДК 678.4:629.7
Naumov I.S., Petrova A.P., Barbotko S.L., Gulyaev A.I.
Rubbers with the lowered combustibility on basis of ethylenepropylene-diene rubber

The choice of optimum flame retardant and its content in rubber mix is made for creation of self-extinguishing rubber on basis of ethylenepropylene-diene rubber (EPDM). The structure and complex of physical-mechanical and operational properties of rubber on the basis of EPDM with lowered combustibility of optimum composition are studied. Results of research of the influence of particle size of flame retardants – aluminum and magnesium hydroxides on curing processes, combustibility, physical-mechanical characteristics and rubber microstructure on the basis of EPDM are provided.

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10.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-10-10
УДК 678.8
Kondrashov S.V., Gunyaeva A.G., Shashkeev K.A., Barinov D.Y., Soldstov M.A., Shevchenko V.G., Muzafarov A.M.
Electrically-conductive hybrid polymer composite materials on the basis of noncovalent functional carbon nanotubes

The overview of ways of giving the increased conductivity to polymer composite materials is presented. Results of researches on receiving electrically conductive hybrid polymer composite materials on the basis of noncovalent functional carbon nanotubes are provided. Researches of electrophysical, thermo - and physicomechanical characteristics are conducted. According to the results of experiments it is established that level of achieved functional properties is sufficient to successfully solve problems of giving anti-static properties to fibreglass products and increased resistance of the polymer carbon fiber materials to lightning discharge.

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11.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-11-11
УДК 678.83:620.165.79
Shuldeshova P.M., Deev I.S., Zhelezina G.F.
Features of destruction of SVM aramide fibers and structural organoplastics on their basis

Nature of destruction of SVM aramide fiber and structural organoplastics on its basis is researched. Features of destruction of fiber are to be considered when developing this class of polymercomposites. Nature of fibers destruction is considered at stretching and compression, as well as behavior of SVM fiber at stretching of the organoplastics on its basis.

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12.
dx.doi.org/ 10.18577/2307-6046-2016-0-2-12-12
УДК 666.7
Evteev A.А.
Some aspects of development of optimal firing conditions for ceramic compositions containing eutectic additives

The methods used to analyze the regularities of thermally activated processes are discribed. It is shown that the most informative and reliable methods are the isothermal methods. The data on the initial components and their conversion ways to experimental samples in the technological scheme are presented. In the example of alumina materials modified with various amounts of various eutectic additives it was found that the sintering process obeys the equation of the first order kinetics formal. The apparent activation energy of sintering and initial patterns for the development of optimum firing mode of the materials are determined.

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