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Published By Fsue Crism Prometey

1994-6716

Author(s):  
A. A. Deev ◽  
G. Yu. Kalinin ◽  
K. E. Sadkin

This article shows the possibility of using high-strength nitrogen-containing corrosion-resistant steel grade 04Kh20N6G11M2AFB for the construction of critical elements and units of marine equipment operating at low temperatures, including the Arctic. The advantages of nitrogen-containing steel over clad steel AB2 + 08Kh18N10T always used in shipbuilding and welded steel of F500W category are considered. According to the assessment of testing of homogeneous nitrogen steel sheets, the level of its physical and mechanical properties exceeds the analogous parameters of traditional AB2 + 08Kh18N10T steels in a wide temperature range, up to –90°C.


Author(s):  
D. V. Belov ◽  
S. N. Belyaev ◽  
M. V. Maksimov ◽  
G. A. Gevorgyan

This paper presents an experimental study of biocorrosion of D16T and AMg6 aluminum alloys. The determining role of reactive oxygen species in aluminum biocorrosion by a consortium of molds has been shown. A model is proposed, according to which the initiators of corrosion damage to the metal surface are superoxide anion radical and hydrogen peroxide released during the life of micromycetes. It is assumed that the initiation and development of biocorrosion occurs, among other things, as a result of the process of reductive activation of oxygen and the Fenton decomposition of hydrogen peroxide. A conclusion is made about the mechanism of the occurrence of intergranular and pitting corrosion of aluminum alloys interacting with microscopic fungi.


Author(s):  
E. A. Khorova ◽  
E. N. Eremin ◽  
E. A. Strizhak

The subject of the study were rubbers based on partially and fully hydrogenated nitrile-butadiene rubbers (HNBR) Therban АТ 5065 VP and Therban АТ 5005 VP, taken individually and in the ratios 80:20, 70:30, 60:40, 50:50 accordingly. The purpose of the work was to study the functional properties of rubbers based on HNBR of various degrees of unsaturation using modern methods of analysis. The degree of dispersion of the filler and the thermodynamic compatibility of polymer components in rubbers based on Therban АТ 5065 VP and Therban АТ 5005 VP mixtures are appreciated. Glass transition and decomposition temperatures, elastic modulus and mechanical loss tangent of HNBR-based and their combined compositions were identified. The microrelief of the surface of rubber samples based on HNBR, taken in different ratios, was investigated.


Author(s):  
A. V. Ilyin ◽  
K. E. Sadkin ◽  
N. S. Zabavichev

The normative methods for calculating the fatigue strength of welded joints are of limited use for low-cycle loads, as they do not take into account the possible variation in the asymmetry of the operating stress cycle, differences in the expected level of residual stresses, and the possible variety of joint geometry. Estimation procedures have been developed for shell structures made of high-strength steels subjected to external and internal pressure. They were based on experimental data on the resistance to fatigue fracture, physical modeling of individual stages of fatigue damage, and generalization of the results of numerical studies of the FEM of the stress-strain state.


Author(s):  
E. D. Kolpachkov ◽  
P. S. Marakhovsky ◽  
A. P. Petrova ◽  
P. A. Shchur ◽  
S. L. Lonsky ◽  
...  

This article presents the results of a study of the hydrophilic properties of VMPS-10 84x4 glass filaments and SYT-49S 12K carbon tows. It has been found that the contact angle of glass and carbon fibers, which decreases after ion-plasma treatment, returns to its original values within 8 days. The capillarity values of both types of fibers increase irreversibly, but for carbon fibers, we observe a more significant change in this parameter. In the course of studying the microstructure of the surface of filler fibers before and after processing, it was found that all samples were uniformly covered with a film of an active lubricant with a microdispersed structure; however, for glass fibers, the size of the sizing particles increased during processing, and for carbon fibers, it decreased. In addition, thermophysical studies of the used reinforcing fillers were carried out, and it was found that during the ion-plasma modification, the erosion of the sizing film occurred.


Author(s):  
O. V. Glibenko ◽  
T. V. Vikhareva ◽  
A. V. Ilyin

The ultimate deformation capacity of stainless high-alloyed austenitic nitrogen-containing steel and low-alloyed chromium-nickel-molybdenum steel up to the moment of failure under single and multiple blast loading in the air has been investigated. The paper presents data on the change in the mechanical properties and structure of these steels as a result of explosive loading to the limit and to the specified level of deformation.


Author(s):  
A. S. Oryshchenko ◽  
V. P. Leonov ◽  
V. I. Mikhaylov

The results of the work of the NRC “Kurchatov Institute” – CRISM “Prometey” on the creation of titanium alloys for deep-sea marine equipment, vehicles and submersibles are presented. The paper considers development of titanium alloys with a yield strength of more than 1000 MPa.


Author(s):  
G. I. Nikolaev ◽  
Yu. L. Kuzmin ◽  
I. V. Lishevich ◽  
O. A. Stavitsky ◽  
A. V. Podshivalov ◽  
...  

This article presents the results of the development and implementation of special ice-resistant anodes on nuclear icebreakers and offshore structures, capable of ensuring long-term effective cathodic corrosion protection systems under shock and abrasive effects of Arctic ice. The results of inspections of the hull and hull elements of the cathodic protection of the nuclear icebreaker “50 Let Pobedy” and the offshore ice-resistant platform “Prirazlomnaya” after their long-term operation are shown. Cathodic protection of the atomic icebreaker “Leader” has been described.


Author(s):  
A. S. Oryshchenko ◽  
I. P. Popova ◽  
Yu. A. Utkin ◽  
S. N. Petrov

On the basis of expert examinations of spent pipes metal operated as coil-pipes at pyrolysis furnaces, heat-resistant alloys and technologies for manufacturing standard products from them have been developed. The service characteristics of the developed alloy 45Kh32N43SB and its welded joints at temperatures of 1100 and 1150°C have been investigated. It is shown that the alloy has structural stability and the ability to resist high-temperature creep at operating temperatures up to 1150°C. A method has been developed for assessing the resource of pipe elements, taking into account the peculiarities of its operation, as well as crack-like defects in the pipe material. The reasons for the significant deformation and damage of the crossover piping, leading to the premature failure of the coils, have been found. The most significant operational factor of damage to the heat exchangers at pyrolysis plants has been identified.


Author(s):  
R. Yu. Bystrov ◽  
D. A. Gerashchenkov

In recent years, the unique physical and mechanical properties of high-entropy alloys (HEAs) have been the subject of increased attention of researchers. The study of the thermodynamic characteristics of such materials may be of interest for formulating the principles of the formation of structures with the required functional characteristics. Since the processes of structure and phase formation, as well as the diffusion mobility of atoms, the mechanism for the formation of mechanical properties and thermal stability differ significantly from similar processes in traditional alloys, HEAs are singled out into a special group of materials.The article presents a brief overview of the results of obtaining a high-entropy alloy by the combined method. At the first stage, a precursor layer was deposited by сold gas dynamic spraying (CGDS), and at the second stage, it was subjected to high-energy action using a laser. An alloy of the Al-Cr-Ni-Co-Fe type has been studied. By varying the ratio of the components, it was possible to obtain an almost equimolar composition for this system. A prediction of properties and structure is made based on the phase composition of the system.


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