Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-3-14
УДК 669.725
Sevalnev G.S., Nefedkin D.Yu., Druzhinina M.E., Mosolov A.N., Samoilova I.I., Maksimov A.V.
KINETICS OF DIFFUSION SATURATION OF BERYLLIUM-CONTAINING STEEL VNS32-VI AT VARIOUS TYPES OF THERMOCHEMICAL TREATMENT

Microstructure, microhardness and kinetics of diffusion saturation of beryllium-containing steel VNS32-VI after various types of thermochemical treatment were studied. It was found that the microstructure of the diffusion layer consists of martensite, δ-ferrite and carbides of various sizes and morphology. The study of diffusion saturation kinetics showed that increasing the saturation time during vacuum cementation leads to an increase in the thickness of the diffusion layer only with the use of preliminary vacuum nitriding.

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2.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-15-27
УДК 621.791.724
Sukhov D.I., Kaplansky Yu.Yu., Rogalev A.M., Kurkin S. E.
THE FEATURES OF PROCESSING Cr-RICH NICKEL BASED ALLOY BY SELECTIVE LASER MELTING

In this paper the structure and mechanical properties of SLM-built EP648 alloy are investigated. The research results of alloy via SEM, HR-TEM allowed detecting CrN particles and Me23C6 carbides in γ-matrix. The complex analysis of hot cracking in EP648 alloy was done. The effect of scan strategy type and oxygen content on hot crack volume density was shown. The connection between scan strategy type and tensile properties at room temperature was researched.

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3.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-28-38
УДК 621.762:669.3
Peskova A.V., Bakradze M.M., Tikhonov М.М., Kuko I.S.
INVESTIGATION OF THE INFLUENCE OF THE OXIDE LAYER ON THE SURFACE OF PARTICLES METAL-POWDER COMPOSITIONS OF COPPER-CHROMIUM ALLOYS ON THEIR TECHNOLOGICAL PROPERTIES

Researches were carried out metal-powder compositions of the copper-chromium alloy system Cu–(0,5–1,0 %)Cr, obtained by the method of gas atomization. The influence of the formed oxide layer on the surface of particles on the technological properties of the powder has been researched. After the selective laser fusion, a change in the color of the powder from copper to violet was detected, as well as a formation of conglomerates, which led to a decrease in properties. Researches were carried out of fluidity, bulk density, as well as an assessment of the particle morphology were carried out metal-powder compositions before and after selective
 laser fusion.

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4.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-39-49
УДК 620.1
Lukinа E.A., Naprienko S.A., Gorbovets M.A., Zaysev D.V., Oglodkova Yu.S.
CHANGES IN THE STRUCTURAL AND PHASE STATE OF COLD-FORMED SEMI-FINISHED PRODUCTS FROM Al–Li-ALLOYS AFTER VARIOUS LOW-TEMPERATURE EFFECTS

The structure and phase composition of pressed semi-finished products from two batches of alloy 1420 in states after natural and artificial aging have been studied by x-ray diffraction analysis, optical and electron microscopy. The mechanical properties, dimensions and character of the separation of the hardening phases are determined, the values of the lattice periods of the matrix and the phase of the pressed profiles of alloy 1420 are analyzed. A comparative structural analysis was carried out with cold-rolled semi-finished products of alloy 1424 – after aging, as well as additional, long-term low-temperature heating.

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5.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-50-68
УДК 538.9:624.1
Nerush S.V., Kaplansky Yu.Yu., Dynin N.V., Benarieb I., Savichev I.D.
DEVELOPMENT OF LASER POWDER BED FUSION PARAMETERS, STRUCTURE AND MECHANICAL PROPERTIES OF A HIGH-STRENGTH ALUMINUM ALLOY Al–Ce–Cu

Presents the results of studies of the structure and mechanical properties of a heat-resistant aluminum alloy Al–Ce–Cu produced by laser powder bed fusion (L-PBF). The influence of the synthesis parameters on the single track’s formation, the structure of melt pool, and the properties of Al–Ce–Cu alloy has been studied. The analysis of the mechanical properties of the synthesized material was carried out in comparison with the cast material under normal conditions and elevated temperatures. The developed modes of synthesis provided a twofold increase in the yield strength and an eightfold increase in the plastic strain degree of the Al–Ce–Cu alloy in comparison with the cast one, which significantly expands the scope of its application for aircraft critical parts. A comparative analysis of the mechanical properties of the cast and synthesized material under normal conditions and elevated temperatures is given. Using scanning electron microscopy, a high-resolution transmission electron microscopy (HRTEM) and thermodynamic modeling of the phase composition, the structural-phase state of the material in the cast and synthesized states was studied.

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6.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-69-83
УДК 669.715
Sbitneva S.V., Lukinа E.A., Benarieb I.
SOME STRUCTURAL FEATURES OF ALUMINUM ALLOYS OBTAINED BY SELECTIVE LASER MELTING (review)

Selective laser alloying (SLM) of metal powders is one of the most common methods of additive manufacturing of products. The most studied aluminum alloys for SLS technology are AlSi12 and AlSi10Mg alloys. In the paper, using the example of these alloys, some structural features of synthesized aluminum alloys are described, as well as typical defects that can form during synthesis depending on various factors. Scientific and technical literature data on the structure and mechanical properties of aluminum alloys of other alloying systems (Al–Cu–Mg, Al–Mg–Sc, Al–Zn–Mg–Cu) are presented.

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7.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-84-96
УДК 669.018.95
Lutsenko A.N., Efimochkin I.Yu., Moiseeva N.S.
STUDY MECHANISM FORMATION A SURFACE LAYER METAL COMPOSITE MATERIAL BASED ON Mo–Si–B SYSTEM AFTER HIGH-TEMPERATURE INFLUENCE AT DIFFERENT ANGLES OF ATTACK

The paper analyzes the changes phase composition of the surface layer metal composite material base on Mo–Si–B system, reinforced with dispersed particles Al2O3 oxide. The main stages formation phase composition surface layer with a thickness of 0–250 microns at an exposure temperature of 1300–2100 °C have been established by x-ray phase analysis. It is established that protective amorphous phase is formed at temperature of 1700 °C. At a heating temperature of 1900 °C and above, the glassy layer ablates, which leads to oxidation of the near-surface layers of the base material.

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8.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-97-106
УДК 669.018.95
Zhitnyuk S.V., Medvedev P.N.
INVESTIGATION OF MICROSTRUCTURE AND PHASE COMPOSITION OF THE METALLIC COMPOSITE MATERIAL Al–Si–Mg SYSTEM MODIFIED BY SILICON CARBIDE PARTICLES BY MECHANICAL ALLOYING. Part 1

The development of composite materials based on aluminum alloys modified with ceramic fillers is one of the most important areas of materials science today. The most promising method for obtaining composite materials based on aluminum is the method of selective laser melting. The purpose of this work is to identify the features of the formation of the microstructure and phase composition of the composite powder in the process of mechanical alloying of aluminum alloy VAS1 and silicon carbide depending on time.

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9.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-107-118
УДК 669.018.95
Zhitnyuk S.V., Medvedev P.N.
INVESTIGATION OF MICROSTRUCTURE AND PHASE COMPOSITION OF THE METALLIC COMPOSITE MATERIAL Al–Si–Mg SYSTEM MODIFIED BY SILICON CARBIDE PARTICLES BY MECHANICAL ALLOYING. Part 2

The process of mechanical alloying of aluminum alloy BAC1 with silicon carbide particles in a ball mill has been studied. An analysis of the stages of the process of mechanical alloying in the preparation of BAC1–SiC powder compositions was carried out and characteristic microstructures corresponding to each stage were identified. A hypothesis was formulated about the effect of collisions of granule particles on the formation of the structure of composite particles during mechanical alloying of an aluminum alloy BAC1 with silicon carbide SiC, which satisfactorily describes the experimental results obtained.

 

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10.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-119-127
УДК 666.762.14
Maximov V.G., Babashov V.G., Varrik N.M., Lyulyukina G.Yu.
STUDY OF THE HABITUS OF MULLITE CRYSTALS IN COMPOSITE CERAMICS «MULLITE–ZIRCONIUM DIOXIDE»

Presents the results of studying the microstructure features of the ceramic composite material «mullite–zirconium dioxide». It is confirmed that the crystals of mullite, as in traditional mullite ceramics, have the habit of a long four-sided prism. Zirconium dioxide crystals provide hardening of the material by the mechanism of turning the crack to the interface, which, in combination with the specific habitus of the crystals of the main phase, leads to the formation of a characteristic highly developed fracture surface and improves the resistance of the material to cracking.

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11.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-128-138
УДК 621.763
Burkovskaya N.P., Bobrovkiy A.P., Efimochkin I.Yu., Bolshakova A.N.
SPHEROIDIZATION OF POWDER COMPOSITIONS BASED ON REFRACTORY METALS (review). Part 1

At present, additive technologies, including layer-by-layer synthesis technologies, are currently one of the most dynamically developing areas of modern materials science. Since raw materials for the production of products by additive technologies are an important component of the process, the development of methods for spheroidizing powder compositions is relevant and has practical significance. The priority goal of additive technologies has always been the manufacture of products from metals with certain physical and mechanical properties, in particular, metals and alloys for high-temperature applications.

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12.
dx.doi.org/ 10.18577/2307-6046-2023-0-1-139-156
УДК 547-31/-39,547.874+62-03
Dolgova E.V.
APPLICATION OF CYANATE ESTER MATERIALS Part 2. Microelectronics, 3D printing, radiation protection

The publication is a continuation of the review of application of cyanate ester materials. This article provides information about prospects for the useing of cyanate ester resins in microelectronics, as well as in relatively new applications for these resins, such as the insulation of superconducting magnets and additive technologies. The main advantages of cyanate esters polymers (polytriazines) are described and examples of commercial foreign materials are given.

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13.
CONTENТS

Heat-resistant alloys and steels

 

Sevalnev G.S., Nefedkin D.Y., Druzhinina M.E., Mosolov A.N., Samoylova I.I., Maksimov A.V. Kinetics of diffusion saturation of beryllium-containing steel VNS32-VI at various types of thermochemical treatment

 

 

Sukhov D.I., Kaplansky Yu.Yu., Rogalev A.M., Kurkin S.E. The features of processing Cr-rich nickel based alloy by selective laser melting

 

 

Peskova A.V., Bakradze M.M., Tikhonov M.M., Kuko I.S. Investigation of the influence of the oxide layer on the surface of particles metal-powder compositions of copper-chromium alloys on their technological properties

 

Light-metal alloys

 

Lukina E.A., Naprienko S.A., Gorbovets M.A., Zaitsev D.V., Oglodkova Yu.S. Changes in the structural and phase state of cold-formed semi-finished products from Al–Li- alloys after various low-temperature effects

 

 

Nerush S.V., Kaplanskii Yu.Yu., Dynin N.V., Benarieb I., Savichev I.D. Development of laser powder bed fusion parameters, structure and mechanical properties of a high-strength aluminum alloy Al–Ce–Cu

 

 

Sbitneva S.V., Lukina E.А., Benarieb I. Some structural features of aluminum alloys obtained by selective laser melting (review)

Composite materials

 

Lucenko A.N., Efimochkin I.Yu., Moiseeva N.S. Study mechanism formation a surface layer metal composite material based on Mo–Si–B system after high-temperature influence at different angles of attack

 

 

Zhitnyuk S.V., Medvedev P.N. Investigation of microstructure and phase composition of the metallic composite material Al–Si–Mg system modified by silicon carbide particles by mechanical alloying. Part 1

 

 

Zhitnyuk S.V., Medvedev P.N. Investigation of microstructure and phase composition of the metallic composite material Al–Si–Mg system modified by silicon carbide particles by mechanical alloying. Part 2

 

 

Maksimov V.G., Babashov V.G., Varrik N.M., Lyulyukina G.Yu. Study of the habitus of mullite crystals in composite ceramics «mullite–zirconium dioxide»

 

Burkovskaya N.P., Bobrovsky A.P., Efimochkin I.Yu., Bolshakova A.N. Spheroidization of powder compositions based on refractory metals (review). Part 1

 

Dolgova E.V. Application of cyanate ester materials. Part 2. Microelectronics, 3D printing, radiation protection

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