Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-1-1
УДК 669.017.165
Oglodkov M.S., Grigoriev M.V., Pahomkin S.I., Ryabova E.N.
Research of influence of homogenizing modes on mechanical properties of large bars from aluminum-lithium alloys V-1481

A study was made of the features of phase dissolution in the two-step homogenization of pi-lot-industrial ingots of B-1481 alloy based on the Al–Cu–Li system. It is shown that an increase in exposure at the second stage contributes to the almost complete dissolution of the nonequilibrium eutectic. Homogenization of ingots of alloy B-1481 according to the regime: the first stage – at a temperature of 70–100°C below the temperature of the nonequilibrium solidus, and the high-temperature second stage is slightly higher than the temperature of the nonequilibrium solidus, it allows achieving the most complete dissolution of phases precipitated during crystallization, Technological plasticity of the material at the temperature of hot deformation.

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2.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-2-2
УДК 621.745.55:669.715
Dynin N.V., Ivanova A.O., Khasikov D.V., Oglodkov M.S.
Selective laser melting of aluminium alloy (review)

The article presents a review of studies of different research teams on the technology of selective laser melting of aluminum alloys. The review considers features of aluminum alloys, including the presence of stable oxide films, high reflectivity, thermal conductivity and low fluidity of the powder composition, influencing the fusion process and obtains high-quality structure. The presented results on the influence of different parameters and the chemical composition of materials to their characteristics. Brief description of the main systems of alloying of aluminum alloys used for the manufacturing samples and prototypes using additive technologies.

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3.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-3-3
УДК 669018.44:669.245
Min P.G., Sidorov V.V., Vadeev V.E., Bondarenko Yu.A.
The method of impurities concentration by decrement moving rate of directed melt solidification in high gradient conditions

The efficiency method for concentration of nonmetallic inclusions with sulfur, phosphorus and silicon from melt of nickel-based superalloys in high gradient conditions and reduced rate of moving the crystallization front (V=6 mm/h). Experimentally established that using of this method allows to concentrate a main part of nonmetallic inclusions with sulfur, phosphorus and silicon in casting top limited volume. It makes enable detection of inclusions, chemical composition research, morphology and location in structure of alloy. In this case occurs reducing of impurities content in bottom part of casting.

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4.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-4-4
УДК 669.14.018.8
Sukhov D.I., Mazalov P.B., Nerush S.V., Khodirev N.A.
The influence of SLS parameters on pores formation in stainless steel material

The influence of SLS process parameters on material structure is considered in this article. As the results of this work the main connections between SLS parameters were determined. Some conclusions about SLS process were made. It is shown that there are a few ways of SLS process optimization and the determination of peak hatch spacing value is one of them. Another way includes the correlation between hatch spacing and scanning speed. The increase in scanning speed value should be performed with decrease in hatch spacing value and vice versa. The other ways of SLS process optimization were also considered in this paper. The volume energy density should be taken into consideration while SLS parameters optimization is carried out. It is also shown that an applying HIP to SLS material could eliminate pores with diameter less than 80 μm.

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5.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-5-5
УДК 620.1:669.25
Farafonov D.P., Degovets M.L., Rogalev A.M.
Research of experimental compositions of wear-resistant alloys on the basis of cobalt for repair and hardening of working blades of high-pressure turbines by method of laser welding

In article results of researches of heat resisting wear-resistant alloys on the basis of cobalt (systems Co–Cr–W–C, Co–Cr–Mo–Si) are provided. For the purpose of choice of composition of wear-resistant alloy for receiving the high-pure metalpowder composition designed for repair and hardening of high-pressure turbines blades by method of laser welding, comparative researches of properties of experimental cobalt-based alloys are conducted. By results of researches the alloys possessing optimum properties on wear resistances, heat resistance, weldability which can be used for development of technology of receiving from them powder compositions by atomization method are defined.

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6.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-6-6
УДК 669.15
Parshukov L.I.
Research of welded joints under conditions of controlled heating of close areas

The effect of external loads and the type of welded joint on the stress-strain state in the seam at the electron beam welding. It is shown that the argon arc welding, which is characterized by multilayer during welding of large thickness and a large residual strain in the welded joint leads to a weakening of the retention of structural elements. In some cases, the technical task conditions on structural elements should not be heated above a certain temperature during welding. This constraint greatly increases the TIG welding, since the imposition of a weld produced in small areas. The efficiency of electron beam welding with respect to TIG. Calculated temperature field and the stress-strain state of welded joint during welding and after.

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7.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-7-7
УДК 678.8
Nikolaev E.V., Pavlov M.R., Laptev A.B., Ponomarenko S.A.
To the problem of determining the moisture sorbed in polymeric composite materials

The content of moisture sorbed in polymeric composite materials of various nature was estimated by three different methods of physico-chemical analysis. The applicability of all analytical methods is shown. Recommendations on preparation conditions for each type of materials studied are proposed.

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8.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-8-8
УДК 678.747.2
Mishurov K.S., Fayzrakhmanov N.G., Ivanov N.V.
ENVIRONMENTAL EFFECTS ON PROPERTIES OF CFRP (CARBON FIBER REINFORCED PLASTIC) VKU-29

The influence of climatic factors and fluids on the properties of CFRP VKU-29, on the basis of reinforcing carbon fabric and epoxy binder VSE-1212, manufactured by autoclave molding is investigated. It is shown that the CFRP VKU-29 has a high level of property preservation (not less than 72% of the initial value) when exposed to environmental factors (thermal and hydrothermal aging, resistance to the salt spray chamber, water, moisture, fuel, oil, anti-icing fluid and solvent ) and replies by the aviation safety requirements for corrosion and flammability.

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9.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-9-9
УДК 621.742.48
Veshkin E.A, Postnov V.I., Semenychev V.V.
Evaluation of binder VST-1210 with different curing modes by sclerometry methods

Cured samples from the binder VST-1210 with the help of a laboratory sclerometer were applied to scratches under various loads on the diamond indenter, after which the character of the formed grooves and their geometry were studied. It has been established that the microhardness of the samples and the nature of the grooves depend on the modes of curing the binder. The applied method of sclerometry made it possible to determine the curing regimes of the samples in which, after the action of the indenter, the plastic is cracked, or the chevron character of the channel of the groove, indicating a low degree curing.

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10.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-10-10
УДК 678.8
Veshkin E.A, Satdinov R.A., Postnov V.I., Strelnikov S.V.
Evaluation of effect of duration and storage condition on the properties of prepreg and PCM based on it

The effect of time and storage conditions of the prepreg, based on the phenol-formaldehyde binder VSF-16M and T-64 glass fiber cloth (VMP), on its technological properties was evaluated. Elastic-strength properties of GRP based on this prepreg are investigated. To assess the prepreg of fiberglass, the differential scanning calorimetry (DSC) method was used and the gel time of the binder in it was analyzed. Based on the results of the study, conclusions were drawn as to the shelf life of the prepreg.

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11.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-11-11
УДК 66.017
Semenychev V.V., Smirnova T.B., Panarin A.V.
Study of the light transmission of sulfamino acid electrolyte nickel plating with additives of various nanosized particles and evaluation of the properties deposited in them of cluster nickel coatings

Using a photometer KFK-3-01-«ZOMZ», the light transmission of sulfamino acid electrolyte of nickel plating containing nanosized particles of various manufacturers was investigated. In the initial and each electrolyte with nanoparticles, nickel coatings were deposited on samples from steel 30ХГСА. The effect of the presence of nanoparticles in the electrolyte was evaluated by measuring the porosity of the deposited coating, its thickness and microhardness, as well as by studying the geometry of the grooves formed by the diamond indentor under various loads.

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12.
dx.doi.org/ 10.18577/2307-6046-2017-0-8-12-12
УДК 669.721.5:620.197.5
Kozlov I.A., Vinogradov S.S., Kulyushina N.V.
Influence of the form of the polarizing impulses on structure and protective properties PEO coating formed on alloy ML5

Magnesium alloys have good specific mechanical and technological properties and represent high interest for the aviation industry. Today the issue of corrosion protection of magnesium alloys is not resolved. In work use question plasma electrolytic an oxidation (PEO) for protection of magnesium alloys is considered. Are compared structure and PEO properties of the coating created in silicate electrolit solution at various duration of polarizing impulses. The received results were confirmed power efficiency of short impulses with a squared duration of 2•10-4 over sinusoidal impulses lasting 2•10-2. Short impulses were increased microhardness and kept protective properties of PEO coating.

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