Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-1-1
УДК 669.018.44:669.245
Echin A.B., Bondarenko Yu.A.
STRUCTURAL FEATURES AND PROPERTIES OF SINGLE-CRYSTAL Ni-BASED SUPERALLOY PRODUCED UNDER CONDITIONS OF VARIABLE TEMPERATURE GRADIENT ON THE SOLIDIFICATION FRONT

Research of an influence of the directional crystallization conditions (temperature gradient and crystallization rate) on the dendrite arm spacing, size of strengthening γ'-phase in axes and interdendritic areas, porosity, size of eutectic γ /γ'-phase particles, features of segregation and mechanical properties of cast single-crystal superalloy is described in the article.

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2.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-2-2
УДК 669.018.44:669.245
Chabina E.B.
AN INFLUENCE OF OPERATIONAL FACTORS ON THE STATE OF INTERFAC-ES IN HIGH HEAT-RESISTANT Ni-BASED ALLOYS INTENDED FOR GTE DISCS

Changes in structure and chemical composition of grain boundaries in Ni–Co–Cr–Al–Ti–W–Mo–Nb wrought heat-resistant alloys after simulation of operation and operation in GTE disk structure were investigated. The researches have shown that there is a relationship between operational properties and the state of internal interfaces (grain boundaries). The determined regularities are general for Ni–Co–Cr–Al–Ti–W–Mo–Nb wrought Ni-based alloys with different content of alloying elements. It was stated that the mechanisms of a decreasing in cohesive strength of grain boundaries are different after holding within different temperature intervals.

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3.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-3-3
УДК 669.721.5
Mukhina I.Y., Uridiya Z.P.
LIQUATION IN CASTINGS MADE OF Zr-BEARING MAGNESIUM ALLOYS

An uneven distribution of structural components caused by the segregation processes in the alloy during its melting and crystallization may occur on separate machined surfaces of castings in the course of production of Zr-bearing cast magnesium alloys: ML9, ML10, ML12 and VML20 intended for housing parts of hydraulic units, pumps, loaded wheel castings. The article describes the nature and formation mechanism of segregated inclusions. Their influence on the properties of castings is shown.

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4.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-4-4
УДК 629.7.023.222
Pavlovskaya T.G., Kozlov I.A., Volkov I.A., Zakharov К.Е.
FORMATION OF HARD WEAR-RESISTANT ANODIC OXIDE COATINGS ON PARTS MADE OF CASTING ALUMINIUM ALLOYS

A possibility of formation of hard anodic oxide coatings on parts made of casting alu-minum alloys produced by die casting was investigated. A difference in the process of anodizing of parts made by casting in sand mold, in chill mold and by die casting was revealed. An influence of the chemical composition of metal parts on quality of the formed anodic oxide coating was stated. An influence of the metal structure on the process of solid anodizing was investigated.

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5.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-5-5
УДК 629.7.023.222
Kulyushina N.V., Kozlov I.A., Kutyrev A.E., Vagramyan T.A.
ADHESIVE COATINGS ON THE BASIS OF TRIALKOXYSILANES FOR ALUMINUM AND STEEL

A more environment-saving process of formation of adhesive layers on metal surfaces in solutions of organic silicone compounds is offered as an alternative to the processes of phosphating of steels and chromating of aluminum. Trialkoxysilanes-based water compositions were developed and optimum parameters of the process of forming of organic silicone coatings on metallic surfaces were determined on the basis of experimental data. The offered processes of formation of adhesive coatings have a smaller quantity of stages of surface preparation (both aluminum alloys and steels) for the subsequent application of paint coating.

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6.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-6-6
УДК 532.584:666.37
Buchilin N.V., Prager E.P.
ON RHEOLOGICAL CHARACTERISTICS OF ALUMINA-BASED SLIP SUSPENSIONS

The results of rheology investigations of alumina-based slip suspensions intended for production of ceramic filters are presented. It was shown that the replacement of water used as a technological binder with the water solution of carbamide and aluminum oxychloride leads to an increase of suspensions fluidity that, in turn, facilitates formability of green bod-ies and improves mechanical characteristics of ceramic materials. The ranges of ratios between solid phase (sintered powders) and liquid phase (technological binder) providing coagulation and direct contacts between solid phase particles in slips were determined.

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7.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-7-7
УДК 621.78.011:621.775.8
Shcheglova T.M., Nikitina V.J., Lugovoy A.A.
AN EXPRESS-METHOD FOR ESTIMATION OF HEAT TREATMENT QUALITY AND STRUCTURE OF DISCRETE FIBERS

An express-method for estimation of heat treatment quality of discrete fibers of 80% Al2O3–20%SiO2 composition and SiO2 dispersion is described in this paper.

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8.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-8-8
УДК 678.067.5
Kurnosov A.O., Melnikov D.A., Sokolov I.I.
STRUCTURAL GLASS-REINFORCED PLASTICS PURPOSED FOR AVIATION INDUSTRY

The article presents data about structural glass-reinforced plastics produced with the use of solvent- and melt-based binders. Some data on the most popular developments of VIAM used in aviation engineering are given. The main advantages of glass-reinforced plastics based on the melt binders are described. Elastic-strength characteristics of the developed glass-reinforced plastics at elevated temperatures, humidity and under action of various aggressive environments were studied. The main fields of application of these materials in aviation equipment are described in the article.

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9.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-9-9
УДК 678.8:658.567
Petrov A.V., Doriomedov M.S., Skripachyov S.Yu.
RECYCLING TECHNOLOGIES OF POLYMER COMPOSITE MATERIALS (REVIEW)

A review of scientific research dealing with waste recycling of polymer composite materials is presented. A list of the companies involved in recycling is given as well. Advantages and disadvantages of the technologies used are described. Recommendations concerning recycling technologies of fiber reinforced PCM are given. The problems to be solved to implement PCM recycling technologies in Russia are described.

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10.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-10-10
УДК 532.5:620.179.1
Murashov V.V., Laptev A.S.
CONTACT LIQUIDS FOR CREATION OF AN ACOUSTIC CONTACT AT ULTRASONIC CONTROL OF MULTI-LAYER STRUCTURES FROM PCM

Ultrasonic methods of non-destructive testing and technical diagnostics, which require application of contact liquids for creation of an acoustic contact between the converter of a test device and the product under control are described. Three groups of contact liquids are considered. The contact liquid MBG-1 based on aqueous solution of polyvinyl alcohol offered by VIAM was investigated. Results of pilot studies of methods to remove the contact liquid after the control procedure are given

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11.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-11-11
УДК 669.245
Eroshkin S.G., Orlov G.V.
RESEARCH OF MATERIAL INHOMOGENEITY OF REFERENCE SAMPLES MADE OF WROUGHT Ni-BASED SUPERALLOY VZH175-ID

Methods of spectral analysis are widely used at production of Ni-based superalloys to determine the chemical composition of the melt. Certified reference samples of material composition (CRMs) are used for plotting of calibration curves to make quantitative spectral analysis. Uncertainty of the certified values of CRMs affects significantly on the accuracy of quantitative analysis. The uncertainty of the inhomogeneity of the CRM composition is one of the components of the total uncertainty of the CRM certified value. In this work, a study of inhomogeneity of wrought Ni-based superalloy VZH175-ID was carried out with the use of X-ray fluorescence spectroscope S8 Tiger and measurement conditions were selected. The standard uncertainty of the heterogeneity was estimated. It was shown that the obtained level of the standard uncertainty of heterogeneity allows the usage of CRM material for development and production of state standard reference samples (SCRM) of the approved type.

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12.
dx.doi.org/ 10.18577/2307-6046-2015-0-8-12-12
УДК 620.172
Solovyov A.E., Golinets S.A, Khvatskiy K.K., Aslanyan I.R.
PERFORMING OF STATIC TENSILE TESTS ON ZWICK/ROELL MACHINES

In the course of operation, materials of aircraft gas turbine engine components are subjected to very different static and dynamic loads over a wide range of operating temperature and durability. Therefore, for strength calculations of basic engine parts and verification of their resource it is necessary to have a large nomenclature of the strength characteristics of metals under static and cyclic loading. This paper presents a statistical overview of tensile strength of titanium alloy VT41 obtained on Zwick/Roell machines.

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