Nikolay Viktorovich AbabkovKuzbass State Technical University · Department of Mechanical Engineering
Nikolay Viktorovich Ababkov
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Publications (58)
The work shows that the values of the yield strength of steel 20 after long-term operation and deformation, obtained experimentally and by calculation, differ significantly. This is primarily due to the fact that all coefficients require experimental verification. However, the data obtained can be used to determine the role of each contribution (in...
The use of acoustic and magnetic methods of non-destructive testing to detect zones of stable localization of deformation in order to assess and predict the performance of long-term equipment is of scientific and practical interest at present. A structural–mechanical criterion was developed that reflects the relationships between the structural and...
The use of acoustic and magnetic methods of non-destructive testing to detect zones of stable localization of deformation in order to assess and predict the performance of long-term equipment is of scientific and practical interest at present. A structural-mechanical criterion has been developed, that reflects the revealed relationships between the...
A study of metal samples from exploited and damaged sections of steam pipelines made of 0.12С-1Сr-1Mo-1V steel after deformation to the formation of zones of stable localization of deformations by the method of electron microscopy was carried out. Specimens without exploitation, after exploitation, but not damaged, and specimens after exploitation...
A study of metal samples of sections of steam pipelines made of 0.12C-1Cr-1Mo-1V steel after long-term operation (260 thousand hours) and deformation before the formation of zones of stable localization of deformations by the method of electron microscopy was carried out in this work. Various sections of samples made of 0.12C-1Cr-1Mo-1V steel were...
The analysis of factors affecting the state of the metal of pipelines of heating networks on the territory of hazardous production facilities is carried out, of which the effect of mechanical loads should be especially distinguished. The necessity of carrying out additional types of control along with visual and measuring control during routine ins...
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The paper presents the results of the analysis of the microstructure, mechanical properties, acoustic and magnetic characteristics of the metal of pipelines that are part of heat and power equipment, after long-term operation, made of structural and heat-resistant steels in the zones of localization of plastic deformation. Samples of 0.2 С steel an...
Nowadays initial assessment of welding quality is performed by testing equipment with increased loads (high pressure) at technical devices of hazardous production facilities. Test requirements are regulated by standardized documents of the Federal Service for Environmental, Technological and Nuclear Oversight of Russia (Rostekhnadzor). Recently, al...
The paper studies the structure and phase composition of steel 0.12C–1Cr–1Mo–1V–Fe (grade DIN 14MoV63) after a long-term operation using the transmission electron microscopyю Investigated are the nontreated specimen (not subjected to operation) and specimens after a long-term operation with and without fracture. The phase composition and morphology...
The paper presents the results of the analysis of the microstructure, mechanical and acoustic characteristics of the metal of heat power equipment after long-term operation, made of structural steels in areas of localization of plastic deformation. We study specimens made of the 0.2 C steel and the 0.12C-1Cr-1Mo-1V steel in the initial state and af...
The possibility of identifying zones of localized deformation by the spectral-acoustic method of non-destructive testing in structural and heat-resistant steels is shown in the paper. The values of such parameters as the delay time of a surface acoustic wave, the attenuation coefficient, the amplitude of the received signal, and the intensity of ma...
Investigations conducted by transmission electron microscopy on thin foils were aimed at studying the structural-phase state of heat-affected zone of the welding joint performed by modulated current at two welding modes: coarse-droplet and fine-droplet transfer. Welding was conducted on the austenitic steel 0.12С-18Cr-10Ni-1Ti-Fe using the facility...
The paper presents the transmission electron microscopy (TEM) investigations of the thin film structure and phase composition of the heat-affected zone (HAZ) of a weld joint produced by manual metal arc welding (MMAW) of 0.12C–18Cr–10Ni–1Ti–Fe austenite steel exposed then to plastic deformation. The test machine INSTRON-1185 is used to perform quas...
By the method of transmission electron diffraction microscopy the study of 0.12C-1Cr-1Mo-1V-Fe steel samples subjected to various long-term operation was conducted: 1) on the unfinished sample, 2) after prolonged operation without sample destruction, and 3) after prolonged operation brought to sample destruction. For each sample the phase compositi...
Представлены результаты исследования механизмов упрочнения, формирующих предел текучести в стали Hardox 450 в зоне термического влияния.В последнее время в связи с увеличением добычи угля и применением современной мощной горнодобывающей техники необходимо применять новые материалы с высокими эксплуатационными характеристиками. К таким материалам от...
The paper discusses the features of elastic-plastic transition in welded joints of Mn- Si steel samples made by stationary arc welding consumable electrodes to assess the possibility of exploitation of such compounds after the stress tests. In welded joints made by a stationary arc, the elastoplastic transition is realized by initiating the Chernov...
The structural-phase state of the heat-affected zone of a weld produced by modulated current (fine-droplet transfer) on 0.12 C-18Cr-10Ni-1Ti-Fe austenitic steel was studied by transmission diffraction electron microscopy method on thin foils. Welding modes: amperage and pulse time – 75 А, 0.15 sec., amperage and pause time – 15 A, 0.45 sec, average...
The article is devoted to the consideration of the method of increasing the mechanical and tribological properties of parts of mining machines due to quenching and electric arc hardening of the restored surface layer by welding. The essence of the proposed method was to restore the geometric dimensions of the part with cored wire with guaranteed ha...
One of the most important tasks of technical diagnostics and examination of industrial safety is the problem of assessing the residual life of long-running technical devices of hazardous production facilities. The paper presents the results of the study of the structural-phase state in a stable zone of localization of macrostrains, depending on the...
The paper deals with the investigation of plastic deformation localization in mechanical tension tests of low carbon samples in the initial state and after 25 years of operation in thermal and power equipment. It was established in the tests long before the global loss of stability that stable localized deformation zones are formed in the area of f...
The article considers the approach to solving such problems of technical diagnostics and industrial safety expertise, such as carrying out a “stress test”, namely loading to the yield point with subsequent leak testing, and estimating the residual life of the technical device. The approach is based on research of localized plastic deformation behav...
Investigation of the metal of exploited and damaged bends of water and steam-removing pipes by the spectral-acoustic control method and by the method of electron microscopy was carried out in the work. A sample without damages, a specimen with a corrosion-fatigue crack and a sample with a technological sunset type defect were investigated. Graphic...
Проведено исследование металла эксплуатируемых и поврежденных гибов водоопускных и пароотводящих труб спектрально-акустическим методом контроля и методом электронной микроскопии. В частности, исследованы образцы, не имеющие повреждений, образец с коррозионно-усталостной трещиной и образцы с технологическими дефектами типа заката. Все образцы изгото...
Currently, many industries use foreign-made machinery. There is no opportunity to purchase quality original spare parts for which machinery. Therefore, enterprises operating this equipment are looking for producers of analogues of various parts and assemblies. Quite often, the metal of such analog components turns out to be substandard, which leads...
The paper presents a study aimed at describing the effect of machining parameters on the structural state of the surface layer on the basis of the mechanics of technological inheritance. The samples were controlled by the methods of nondestructive testing and the study of the values of microhardness. Dependencies between the results of the control...
The paper presents the results of transmission electron microscopy (TEM) during the study of structure and phase composition of heat-affected zone (HAZ) of welded joints modified via four welding techniques, namely: electrode welding and electropercussive welding both with and without artificial flaws. The artificial flows represent aluminum pieces...
The paper presents the transmission electron microscopy (TEM) investigations of the structure and phase composition of the heat-affected zone (HAZ) in welded joint modified by four types of welding, namely: electrode welding and electropercussive welding both with and without the introduction of artificial flaws. Artificial flows are aluminum piece...
The paper presents the transmission electron microscopy (TEM) investigations of the structure and phase composition of the type 09G2S weld steel modified by four types of welding, namely: electrode welding and electropercussive welding both with and without the introduction of artificial flaws. Artificial flows are aluminum pieces. TEM investigatio...
A paper presents a fundamentally new approach to the evaluation of health and metal resource potentially dangerous equipment of thermal power stations, based on the identification of patterns of change in the structural-phase state, and the internal stress fields in the long- running metal and welded joints spectrally-acoustic method, taking into a...
The samples of damaged metal steam pipes are studied by acoustic and magnetic methods in the paper. In particular, there are studied sample without damage, samples with creep cracks and samples of with microdamage. All samples were made of 12H1MF steel and have different operating time. A graph of acoustic and magnetic characteristics of the operat...
The paper addresses the issue of the structure and phase composition of welded joint and focuses on their investigation after plastic deformation. The contribution of internal stresses to the formation of phase composition and fine structure of welded joint is shown herein. Electrode welding is used to obtain welded joint in St3 steel. Specimens ar...
The fracture surface of a destroyed steam turbine rotor is studied by acoustic structuroscopy method. The structural-phase state of the metal of the destroyed rotor of a steam turbine is studied using the methods of electron microscopy. It was established that in the areas of control, where the values of the acoustic characteristics have significan...
The structural and phase state of the metal of a fractured rotor of a steam turbine is studied with the use of modern methods of physical research. The metal is shown to contain gradient structures. The cause of the failure of the rotor is established. The gradient structures are determined by the developed method of acoustic scanning.
The structural-phase condition of the weld material subjected to the plastic deformation was investigated using the translucent diffraction electron microscopy method. The investigations were carried out near the joint of the weld and the base metal. The seam was done by the method of manual arc welding without artificial defects. The St3 steel was...
The present paper presents comparative analysis of measurement results of acoustic and magnetic properties in long working metal of boiler drums and the results obtained by methods of electronic microscopy. The structure of the metal sample from the fracture zone to the base metal (metal working sample long) and the center of the base metal before...
The efficiency assessment of acoustic quality monitoring application for research of damages, in particular, the cracks arising at long operation of the heat power equipment is resulted in the present work. The differential equations were first derived describing the change in time delay of surface acoustic waves in the vicinity of the crack, which...
A fragment of a failed steam-turbine rotor is studied by destructive and nondestructive methods so as to understand the factors responsible for its failure and to prevent future recurrences. The structure of the rotor metal is investigated by electron microscopy. A relation is established between the acoustic characteristics and microstructural par...
The main approaches to the technical diagnosis and assessment of residual life of potentially dangerous equipment FEC, currently in use. A new conceptual model resource assessment of parts and units of fuel and energy complex. On the issue of technical diagnostics are considered in complex positions.
To identify the causes of destruction and to prevent future similar cases, this paper focuses on research of the metal fragment of destroyed steam turbine rotor by destructive and non-destructive methods. Using methods of electronic microscopy, a metal structure condition of destroyed rotor is researched. The correlation between acoustic characteri...
The criteria for the maintenance evaluation of long-lived metal of the equipment of heat power plants during the acoustic structuroscopy of weld joints of vapor pipelines and boiler drums are described. The data on the change of the structural state of metal during long-term operation of heat-resistant steels are given. The dependences of the crite...
A conceptual model consisting of diagrams, text and terminology dictionary, made in a formalized way and representations of functions, each of which reflects the real state of the long-running metal at all stages of the life cycle. Based on the developed conceptual model, analysis of the results of electron microscopic studies measuring the acousti...
The effect of different cutting (mechanical heat treatment) on the structural-phase condition and the internal stress field in the surface layers of the product is considered in the article. The regularities of acoustic characteristics depending on the parameters of the structure and stress for the development of nondestructive method for assessing...