Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-1-1
УДК 66.046.516
Ivanova A.O., Zavodov A.V., Dynin N.V., Fomina M.A.
Efficiency of complex alloying AlSi10Mg type alloy with transition metals for selective laser melting technologies

Аdditive manufacturing allows to obtain complex parts with improved material efficiency. Powders of AlSi10Mg alloy are the most widely used for production of various structural elements by selective laser melting (SLM) technology. For the expansion of application and improving service characteristics it is necessary to add small amount of transition metals into the alloys. This paper describes the efficiency of copper, cerium and zirconium additives for improving mechanical properties of AlSi10Mg type alloy.

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2.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-2-2
УДК 669.295
Dobrynin D.A.
Electrolytic-plasma polishing of titanium alloys VT6 and VT8M-1

In the article, a comparative analysis of traditional methods of surface polishing (mechanical, chemical and electrochemical methods) with the electrolytic-plasma treatment method was carried out. Electrolytic-plasma polishing of the surface of samples from titanium alloys VT6 and VT8M-1 in a two-component electrolyte on the basis of hydrofluoric acid salts with a total concentration of no more than 5% by weight was carried out. The polishing rates of titanium alloys VT6 and VT8M-1 in the proposed electrolyte are determined. The influence of the duration of electrolytic-plasma polishing of the surface of samples from titanium alloys VT6 and VT8M-1 on the surface roughness parameter Ra was studied. The qualitative dependences of the polishing rates of the surface of titanium alloys VT6 and VT8M-1 on the concentration of electrolyte, its temperature and operating voltage are established.

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3.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-3-3
УДК 669.018.44:621.745.55
Min P.G., Sidorov V.V., Kablov D.E., Vadeev V.E., Zaysev D.V.
The research of local phosphorus and sulfur distribution in γ and γ'-phases of ZhS36-VI superalloy single-crystals

The distribution of phosphorus and sulfur impurities in γ and γ'-phases of single-crystals was investigated by high-resolution transmission electron microscopy and micro X-ray spectral analysis. It is proved that impurities concentrates principally in γ-solid solution, and there are local areas of increased content in there. The nature of this distribution remains after high temperature long-term strength tests at that heterogeneity of sulfur content between (γ/γ')-phases becomes more pronounced, especially for alloy with high sulfur content. A mechanism for destruction of coherent coupling between γ- and γ'-phases at high impurities content and reducing of single-crystals high temperature strength was suggested.

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4.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-4-4
УДК 669.018.44:669.245
Min P.G., Sidorov V.V., Vadeev V.E.
The impurities and lanthanum behavior at directional solidification of single-crystal superalloys

The silicon, phosphorus and lanthanum behavior during directional solidification of single-crystals ZhS32-VI and VZhM5-VI superalloys for gas turbine blades was studied.

It is proved that saturation with silicon during directional solidification of single-crystals took place for a reason of interaction of carbon with free silicon oxide included in the composition of the ceramic mold. It is founded that saturation with silicon of non-carbon single-crystal alloys occurs four times slower than carbon-containing alloys. The utilization of non-carbon nickel-based superalloys is recommended for high pure provision from silicon impurity and guaranteed high properties of casts.

Experimentally established that lanthanum microalloying of nickel-based superalloys with high phosphorus contain (0,014 wt. %) allows to increase high temperature strength of single-crystals on account strong, refractory compound (lanthanum phosphide) and neutralization harmful phosphorus influence. It is shown that repeated remelting leads to a change in the content of macro- and microalloying elements and consequently reduction in the amount of γ¢-phase and single-crystals service life.

It is recommended to remelt nickel-based superalloys in vacuum induction furnace with optimal composition control by chemical express analysis for provision guaranteed high operational of single-crystals.

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5.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-5-5
УДК 669.018.44:629.245
Bakradze M.M., Lomberg B.S., Filonova E.V., Chabina E.B.
Superalloy VJ175 structural and phase stability assessment after heat treatment and exposure at working temperature

The changes of microstructure and phase composition of disks for gas turbine engines made of superalloy VJ175 after heat treatment and imitation of operating at working temperature (long-term exposure at maximal operating temperature 750°С) are investigated. Mechanical properties are defined, fractography investigations are carried out in initial (heat treated) condition and after long-term for 1000 and 2000 hours heating up to operating temperature.

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6.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-6-6
УДК 669.615-194.55
Parshukov L.I., Gilmutdinov F.Z., Skupov A.A.
Investigation of welding seals of martency steel steel type 03n18k9m5t after local thermocyclic treatment

Theoretical and experimental studies of the stress-strain, chemical and structural-phase state of martensitic aging steel after electron beam welding and subsequent heat treatment are carried out. It is established that the chemical, phase composition, structure, and stress-strain state of the martensitic-aging steel seam depend on the speed of electron beam welding. From the analysis of stressed states of the welded seam, it follows that with a higher welding speed, the residual stresses in the weld seam are greater. Thermocyclic treatment of the seam in a jammed state leads to its hardening and reduction of residual stresses.

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7.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-7-7
УДК 621.791.724
Skupov A.A., Panteleev M.D., Ioda E.N.
Microstructure and mechanical properties of V-1579 and V-1481 laser welds

The structure formation special features of new V-1579(Al–Mg–Sc) and V-1481(Al–Cu–Li)-alloys laser welds (without filler material) was investigated. The laser welding parameters were carried out to provide V-1481 welds strength level about 0,6 and about 0,9 for V-1579. It was also investigated that increasing of welding speed can improve V-1579 welds strength value, but low-cycle fatigue value decreased. As for V-1481 alloy, it is more sensitive to welding thermal cycle: increasing of welding speed for can improve loss of strength and low-cycle fatigue value.

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8.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-8-8
УДК 669.018.95
Serpova V.M., Kosolapov D.V., Zhabin A.N., Shavnev A.A.
Methods for forming semi-finished products for the production of continuous fiber reinforced metal matrix composites (review)

The implementation of new projects in various industries requires the solution of new tasks, one of which is the creation of new materials with higher performance. To one of such materials belong fiber reinforced metal matrix composite materials. An integral step in the creation of which is the development of technologies for their production. The technological scheme of producing fiber reinforced metal matrix composites influences the formation of their structure and properties. Therefore, it is necessary to choose the method of forming semi-finished products for their manufacture, which ensures the insulation of the fibers between each other by a layer of matrix material, the absence of their mechanical damage and chemical interaction with the matrix material, and also promotes uniform distribution of fibers in the material. The article presents an overview of methods for forming semi-finished products for the producing fiber metal matrix composite materials. It is shown that the mo

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9.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-9-9
УДК 678.8:620.1
Bolshakov V.A., Solodilov V.I., Korokhin R.A., Kondrashov S.V., Merkulova Yu.I., Dyachkova T.P.
Research of crack resistance of polymeric composite materials fabricatedby infusion using various concentrates on the basis of modified CNT

In the Russian Federation aircraft component parts and units are usually manufactured by an autoclave solvent polymer impregnation processing technique. However foreign companies used nonsolvent processing technique. Molding without autoclave (for example infusion molding or vacuum and pressure impregnation) sufficiently decreases the FRP production costs. Vacuum impregnation is the matter of the particular interest because there is no need to use sophisticated equipment. For ensuring operability of a material modification by its modified carbon nanotubes is represented especially interesting.

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10.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-10-10
УДК 620.1:678.747.2
Gunyaeva A.G., Cherfas L.V., Komarova O.A., Kuprienko V.M.
Carrying out tests for resistance to lightnings of the experimental and constructive and similar samples executed from carbon plastic, with covering protected from lightnings

Polymeric composite materials (PKM) find the application in different areas of the industry and equipment. In the aviation industry use of new and advanced materials, such as PKM, leads to increase of efficiency of flight vehicles, namely decrease in weight of design. However, with increase in application of PKM in designs of flight vehicles (LA) there was question of their protection against accumulation of static electricity in and lightning strike protection in the conditions of the storm front when flying. In article process of carrying out tests of experimental samples and constructive and similar samples is described – fragments of prototype of the panel covered from CFRP with the lightning strike protection coating (MZP) of the VKU-53MZ developed in FGUP «VIAM», order and methods of carrying out tests, the assessment of firmness of the developed material VKU-52MZ to influence of the electric discharge simulating impulse of lightning current is given.

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11.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-11-11
УДК 678.747.2:620.19
Boychuk A.S., Chertishchev V.Yu., Dikov I.A., Generalov A.S.
Estimation of porosity determination possibility in CFRP by ultrasonic through transmission method

Fiber reinforced plastics (FRP) especially carbon-based plastics (CFRP) is widely used in aircraft structures at present time. Porosity determination of parts and structures full area by nondestructive testing technique is one of the difficulties for specialists in production process. For that purpose the results of ultrasonic through transmission method application are given in this paper. The researches of CFRP specimens without porosity and with 4–5% level of volume porosity were carried out. The results are shown correlation of the level of volume porosity vs. through transmitted pulse amplitude and the response spectrum center frequency. Consequently ultrasonic through transmission method can be useful for the CFRP porosity estimation.

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12.
dx.doi.org/ 10.18577/2307-6046-2017-0-7-12-12
УДК 699.81:66.018.4
Barbotko S.L., Volnyj O.S., Kirienko O.A., Shurkova E.N.
Creation of the mathematical model and calculation of sample temperatures at tests on fire resistance

One of the major characteristics in ensuring fire safety of aviation engineering are fire resistance and fireproof of materials and constructive elements on their basis. Fire resistance characteristics, except the thermal stability of material of fireproof partition are defined also by the size of transmitted heat flux and temperature of not warmed surface. On these characteristics are influence as properties of the tested material, and condition of carrying out testing, therefore development of mathematical model allowing to evaluate influence of different factors on normed characteristics is required. The mathematical model describing heat transfer from flame on monolithic wall and from wall in surrounding space is constructed. Calculation for influence the different factors of material and environmental conditions on specimen fireproof partition temperature are executed.

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