Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-1-1
УДК 669.018.44:669.017.165
Gerasimov V. V., Petrushin N.V., Visik E.M.
IMPROVEMENT OF CASTING TECHNOLOGY AND COMPOSITION OF SINGLE CRYSTAL BLADES MADE OF HEAT-RESISTANT INTERMETALLIC ALLOY

CAD was used to improve chemical composition of single crystal intermetallic Ni-based superalloy with crystallographic orientation (CGO) providing an attractive combination of operation properties: density – 8,0 g/cm3; long-term strength – 130 MPa at 1100°C and =53 MPa at 1200°C and σ-1=370 MPa at 900°C on the base of 2·107 cycles. The process parameters for casting of uncooled single crystal small-sized rotor blades of GTE with CGO from the above alloy were developed. Experimental lots of uncooled small-sized rotor blades were produced with the single crystal structure yield at least 95% under conditions of pilot production at VIAM and 80% - under industrial conditions.

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2.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-2-2
УДК 669.018.44:669.295
Kashapov O.S., Pavlova T.V., Istrakova A.R., Kalashnikov V.S.
AN EFFECT OF IRON CONTENT ON MECHANICAL PROPERTIES OF BARS MADE OF HEAT-RESISTANT TITANIUM ALLOY VТ41

The paper describes the studies focused on structure and mechanical properties of bars made from heat-resistant near-α-titanium alloy VТ41 with different iron contents. It was established that an increase in Fe content leads to modification of microstructure, an increase in strength and fatigue characteristics of the material and to a decrease in ductility characteristics, fracture toughness and heat resistance. In addition, rising of Fe content is accompanied by an increase of sensitivity to stress concentrators at different types of tests.

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3.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-3-3
УДК 669.295.615.46
Panin P.V., Dzunovich D.А., Alexeev E.B.
WAYS OF PHASE AREAS REPRESENTATION IN TITANIUM ALLOYS ADDITIONALLY DOPED WITH HYDROGEN (REVIEW)

Various types of biaxial diagrams used for phase areas representation in titanium alloys with additionally doped with hydrogen have been reviewed both for hydrogenated state and after vacuum annealing. It has been shown that only temperature-concentration phase diagrams describe properly the high-temperature phase equilibria in «Ti-alloy–hydrogen» system. Other diagrams such as «hydrogen content–temperature of hydrogenation», «hydrogen content–cooling rate» and diagrams for quenched and annealed alloys represent phase composition at room temperature.

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4.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-4-4
УДК 620.172.254:669.018.44:669.295
Savushkin A.N., Kashapov O.S., Golinets S.A
AN INFLUENCE OF LOADING RATE ON MECHANICAL PROPERTIES OF HEAT-RESISTANT TITANIUM ALLOYS

Mechanical properties of heat-resistant (α+β) titanium alloys and pseudo-α-titanium alloys VT18U, VT41, VT8, VT8M-1 were investigated depending on loading conditions. The tension test of specimens with different loading rates at 20°С and maximal working temperatures were made for each alloy with the use of TIRA-test 2300/1 testing machine. It was found out that sensibility of heat-resistant titanium alloys to the loading rate varies depending on the alloying level.

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5.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-5-5
УДК 620.165.79:669.295
Berezovsky V.V., Bazaleeva O.K., Kalashnikov V.S.
ELECTRICAL RESISTIVITY OF PURE TITANIUM AFTER SEVERE PLASTIC DEFORMATION AS A FUNCTION OF TEMPERATURE

A temperature dependence of the electrical resistivity of commercially pure titanium after severe plastic deformation was shown as a function of temperature within the range of -100/+100°С. A temperature dependence of electrical resistivity of commercially pure titanium in annealed state was offered as a measurement control technique.

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6.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-6-6
УДК 678.84
Gusev Y.A., Borshchev A.V., Khrulkov A.V.
FEATURES OF PREPREGS INTENDED FOR AUTOMATED LAYING BY ATL AND AFP TECHNOLOGIES

Automated laying made by ATL and AFP methods is used worldwide to increase productivity and accuracy of prepregs laying in the course of manufacture of large-sized PCM-based parts. However, conventional prepregs are not always suitable for processing by these methods – they have to meet special requirements in terms of delivery form, quality and processability. Some features of prepregs intended for automated laying, requirements to them and an influence of laying parameters on their technological properties are discussed in the article.

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7.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-7-7
УДК 678.84
Bespalova E.E., Beljaev А.А., Shirokov V.V.
RADAR-ABSORBING MATERIALS FOR PROTECTION AGAINST HIGH POW-ER MICROWAVE RADIATION

This article is dedicated to the creation of fire-resistant radar-absorbing material based on inorganic fibers with the purpose to lining of anechoic chambers intended for different tests within a wide frequency range; radar absorbing materials and coatings for protection of hardware against high power electromagnetic influence were developed as well.

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8.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-8-8
УДК УДК 629.7.023.222:620.178.162
Aslanyan I.R., Schuster L.S.
WEARING OF NiP ELECTROLYTIC COATINGS AT SLIDING FRICTION

An effect of reinforcing silicon carbide additives and heat treatment on the wear of nickel-phosphorous coatings (NiP) produced by electrodeposition was investigated. It was found that the wear of the investigated coatings could have an abrasive-oxidative nature: predominantly abrasive for NiP–SiC composite coatings and predominantly oxidative for NiP coatings accompanied by fatigue fracture of nickel oxides. Additives of SiC allow increasing the hardness of electrolytic coatings, but they prevent fixation of oxide films formed during friction on the contact surface. Heat treatment increases the hardness of the coatings due to deposition of the crystalline phase Ni3P, which reduces the wear rate of the coatings.

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9.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-9-9
УДК 669.85:543.51
Yakimovitch P.V., Alekseev A.V.
DETERMINATION OF GALLIUM, GERMANIUM, ARSENIC AND SELENIUM CONTENTS IN HEAT-RESISTANT NICKEL ALLOYS MICROALLOYED BY REM USING ICP-MS

Heat-resistant nickel alloys are widely applied in the modern aviation industry and engine building. Some critical components subjected to huge thermal and power loadings are made of them. Thus, an important task is to control chemical composition of nickel-based alloys, in particular the content of trace constituents, which include gallium, germanium, arsenic and selenium. Gallium, germanium, arsenic and selenium content in certified reference samples of nickel alloys microalloyed by REM was determined using mass spectrometry with inductively coupled plasma (ICP-MS). The method of dissolution of a sample and its preparation for analysis was described. Spectral interferences were eliminated using the equations of mathematical correction. The detection limits (% mass.) were as follows: Ga – 0,000002, Ge – 0,000002, Se – 0,00003, As – 0,00004. The range of the defined concentrations was 0,000009–0,0023% mass., the relative standard deviation of not higher than 0,05.

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10.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-10-10
УДК 543.42:669.055
Zagvozdkina T.N., Karachevtsev F.N., Dvoretskov R.M.
APPLICATION OF MODEL SOLUTIONS FOR ICP-AES PROCEDURES

Narrowing of the alloying limits is a current trend in the development of new alloys. In order to determine the exact chemical composition of the alloys under development, it is necessary to use an analyzing procedure, which provides the relative error at least three times lower than the alloying limits. The error value is within 1,5 to 2,5% (rel.) range for the majority of alloying elements. Application of model solutions for atomic absorption analysis to reduce measurement errors of alloying elements and impurities was described in the paper. The use of model solutions as reference samples allowed to reduce the error of measurement techniques down to 1% (rel.).

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11.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-11-11
УДК 678.84
Romanov A.M., Beljaev А.А., Bespalova E.E.
Disadvantages of waveguide techniques for measurement of radar-absorbing material characteristics

It was shown in the paper that the measurement results of reflection ratios of radar-absorbing materials performed in the waveguide for each frequency corresponded to the results of measurements at a certain angle of incidence in case of polarization of the electric vector perpendicular to the plane of incidence; thus, they do not correspond to the measurements at normal incidence. Material permittivity measurement errors caused by a gap between a specimen and waveguide wall were estimated. A simplified expression for estimation of the relative error of permittivity measurements and some examples of errors calculation for the above two cases are given in the paper.

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12.
dx.doi.org/ 10.18577/2307-6046-2015-0-3-12-12
УДК 620.165.79
Nikolaev E.V., Koren’kova T.G., Shvedkova A.K., Valevin E.O.
RESEARCH OF AN INFLUENCE OF TEMPERATURE FACTORS ON AGING OF NEW POLYMER COMPOSITE MATERIALS FOR AVIATION ENGINE NA-CELLE

The choice and substantiation of conditions of thermal aging of polymer composite materials intended for aviation components were described in the paper. Researches of changes in PCM strength at compression, interlayer shift and bending, and in glass-transition area and temperature were conducted at various test temperatures both in an initial state and after an impact of thermal aging. Conditions of thermal aging of materials and a strength characteristic most sensitive to temperature influence, i.e. strength at interlayer shift were defined by the results of research of a «strength/test temperatures» dependence and glass-transition area and temperature. Strength of polymer composite materials at interlayer shift was defined depending on temperature and exposition duration within the chosen conditions of thermal aging. An influence of some assumed operation temperatures and considerably higher temperatures was defined. An influence of temperature depending on the exposition duration w

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