Articles

 


№1 | №2 | №3 | №4 | №5 | №6 | №7 | №8 | №9 | №10 | №11 | №12




1.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-1-1
УДК 669.721.5:669.018.28
Leonov A.A., Duyunova V.A., Stupak E.V., Trofimov N.V.
CASTING OF MAGNESIUM ALLOYS IN DISPOSABLE MOULDS PRODUCED BY NEW METHODS

The article considers the methods of casting of domestic castable magnesium alloys (VML18, VML20) in disposable moulds made of sand-clay mixture, cold box mixture and moulds produced by 3D-printing 3D-models of parts of the steering system com-ponents from magnesium castable VML 18 and VML 20 alloys were developed for the three-dimensional printing.

Read in Russian

2.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-2-2
УДК 621.74:669.018.44
Belicov A.V., Sinichkina T.S., Visik E.M.
UVNK-TYPE VACUUM UNITS FOR CASTING OF SUPERALLOYS (review)

Experimental and industrial UVNK-type units of various sizes purposed for casting of heat-resistant alloys not only at VIAM, but also in industrial production are described in the paper. The units listed in the article cover all requirements of large-scale and short-run production providing an opportunity to manufacture cast products of higher quality.

Read in Russian

3.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-3-3
УДК 629.7.03-226.2
Echin A.B., Bondarenko Yu.A.
MODERN EQUIPMENT FOR TURBINE BLADES PRODUCTION DESIGNED WITH A GLANCE OF HIGH-GRADIENT DIRECTIONAL CRYSTALLIZATION PROCESS

An influence of the high-gradient directional crystallization on the structural features (interdendritic distance and porosity) of the superalloys is presented in the paper. The industrial-scale high-gradient unit of UVNS-6 type and some benefits of its use are shown as well. Studies of some test specimens manufactured on UVNS-6 unit completed with measurement of the interdendritic distance were carried out. The temperature gradient was estimated by experimental method.

Read in Russian

4.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-4-4
УДК 620.19:669.721.5
Uridiya Z.P., Mukhina I.Y., Duyunova V.A., Kosarina E.I.
QUALITY CONTROL OF MAGNESIUM ALLOY CASTING AND METHODS OF RESTORATION OF CAST PRODUCTS IMPERMEABILITY

Some of factors causing appearance of microporosity in magnesium alloy castings were researched. Many parts of different configuration and size with a variable degree of microporosity were studied. According to the analysis of data of ML5 alloy parts research, mechanical properties of castings in case of the steady production process depend, mainly, on the wall thickness of the tested part and on the microporosity degree. The degree of damage caused by microporosity is of a major significance. A scale of microporosity for castings made of ML5 and ML5c.p. magnesium alloys was created. The scale determines the relation between the microporosity image intensity when ML5 alloy casting is being x-rayed and mechanical properties of the casting (ultimate strength and elongation) in the damaged area. The new impregnation compounds Anakrol-90 and KP-GS55 for sealing of micropores and restoration of castings impermeability by vacuum-pressure method were suggested.

Read in Russian

5.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-5-5
УДК 678.84
Babashov V.G., Ivakhnenko Yu.A., Yudin A.V., Zimichev A.M.
CERAMIC MATERIAL FOR PARTS OF CONTINUOUS CASTING UNITS INTENDED FOR PRODUCTION OF NON-FERROUS ALLOYS

The problem of creation of domestic materials to replace imported wear-subjected parts of units for continuous casting of non-ferrous metals and alloys has been solved. Properties of this heat insulating ceramic material based on silica and quartz fibers produced by vacuum molding compare favourable with Wollaston fibers used abroad.

Read in Russian

6.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-6-6
УДК 66.045.3
Butakov V.V., Basargin O.V., Babashov V.G., Ivakhnenko Yu.A.
A BEHAVIORAL MODEL OF THE FIBROUS MATERIAL DURING BENDING TESTS

The paper considers the behavior features of a flexible fibrous material during the bending test. A behavioral model of the flexible fibrous material during bending tests is suggested. This model shows the relationship between ability of the material to withstand bending stress and its ability to the elastic compression and tension. The article describes the correlation between the minimum bend radius and elasticity module at compressive and tension. Proposals on ways to enhance flexibility of the fibrous material are given.

Read in Russian

7.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-7-7
УДК 629.7.023
Vinogradov S.S., Nikiforov A.A., S.V. Balakhonov, Leshchev K.A.
NI–B CHEMICAL COATING’S STRUCTURE AND PROPERTIES INVESTIGATION

The microstructure and the phase composition of Ni–B chemical coating have been investigated. The amorphous precipitate is shown to be crystallized during heating, and the layered-columnar structure disappears; microhardness increases and reaches the maximum value of chrome coating’s microhardness. The porosity not changed at 300°C, and thereafter slightly increases at 350‒400°C.

Read in Russian

8.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-8-8
УДК 669.295
Protsenko O.M., Karachevtsev F.N., Mekhanik E.A.
EXPERIENCE ON DEVELOPMENT OF MEASUREMENT PROCEDURE FOR DETERMINATION OF HYDROGEN CONTENT IN TITANIUM ALLOYS

An overview of publications about advanced research in the field of development and application of titanium alloys is hereby provided. The importance of determination of low hydrogen concentration in titanium alloys is highlighted. The challenge for VIAM now is to develop new measurement procedures and manufacture reference materials (CRMs) with certified hydrogen content. Existing measurement procedures for determination of hydrogen content in Ti alloys are hereby overviewed. The experience of such method developing by using the RHEN-600 gas analyzer unit is considered in details – from the choice of the reference materials and unit pre-treatment method to metrological characteristics estimation. The developed measurement procedure for determination of hydrogen content in Ti alloys by fusion of reference material in inert gas (argon) is approved and included in the State Register.

Read in Russian

9.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-9-9
УДК 54.063
Titov V.I., Goundobin N.V., Pilipenko L.V.
DETERMINATION OF SILICON CONTENT IN HEAT-RESISTANT NICKEL ALLOYS

A possibility of determination of silicon content in heat-resistant nickel alloys (HNA) is surveyed in this work. Silicon in amount >0,4% mass. enriches grain boundaries of the alloy promoting precipitation of plate-shaped M6C carbide films and TCP phase formation and reduction in strength and plastic properties. Rhodamine C was applied at the development of a method for determination of the silicon content in the range of 0,005–0,1% mass. in HNA. The experimental part was to prepare a standard silicon solution, to choose optimal conditions for reaction of «silicon molybdic acid – rhodamine C» complex formation, to verify an influence of environment acidity on the salt formation process of silicon mo-lybdate ions with rhodamine C, the complex stability in time. As a result of the work, a method of direct photometry was developed by which the silicon content can be determined in heat-resistant nickel alloys within the concentration range of 0.005–0.1 % mass.

Read in Russian

10.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-10-10
УДК 669.715
Zagvozdkina T.N., Karachevtsev F.N., Dvoretskov R.M., Yakimova M.S.
DETERMINATION OF SILICON CONTENT IN ALUMINIUM ALLOYS BY ICP-AES METHOD IN COMBINATION WITH MICROWAVE PRE-TREATMENT

Silicon is present in aluminum alloys in a wide range of concentrations – from a few hundredths of a percent in heat treatable alloys up to dozens of percent in casting alloys. Existing techniques for determination of silicon content in aluminum alloys are of low accuracy. To solve this problem, a method of silicon mass fraction measurement in aluminum-based alloys by atomic emission spectrometry with inductively coupled plasma (ICP-AES) in combination with microwave preparation of samples has been developed and certified. Mixture compositions for dissolving and microwave-induced decomposition parameters were selected. Limits of relative measurement error for Si mass fraction from 0,001 to 18% do not exceed 5% (±δ, at P=0,95).

Read in Russian

11.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-11-11
УДК 629.7.023.222
Khokhlov Y.A., Bogatov V.A., Krynin A.G.
AN INFLUENCE OF THE MAGNETIC FIELD DISTRIBUTION ON PROPERTIES OF ITO COATING DEPOSITED ON A POLYMER FILM BY REACTIVE MAGNE-TRON SPUTTERING METHOD

Distribution of magnetic field induction over the surface of a planar magnetron target and its influence on properties uniformity of ITO coating produced by reactive magnetron deposition on polymer substrate with a width of 600 mm is hereby investigated. It was shown that the distribution alignment of the magnetic field induction in the sputtering zone of magnetron target allows to increase uniformity of thickness and electric properties of ITO coating deposited on a large-sized polymer film. Research trends to improve the technology of reactive magnetron deposition on the large-sized polymer substrate are hereby described.

Read in Russian

12.
dx.doi.org/ 10.18577/2307-6046-2014-0-12-12-12
УДК 539.24
Panin S.V., Startsev O.V., Krotov A.S., Medvedev I.M., Frolov A.S.
CORROSION AND AGING OF STRUCTURAL MATERIALS SURFACE STUDIED BY 3D MICROSCOPY

The 3D microscopic control of materials surface aimed to characterize their corro-sion and aging while exposing in open air is hereby justified. The statistical parameters of the samples surface were identified for each individual type of material and the ex-posure conditions and duration. The binder degradation effect on the surface of polymer composite materials exposed to the direct sunlight is considered.

Read in Russian