Influence of a magnetic field generated by a ferromagnetic nanoparticle on the annihilation of triplet-excited organic molecules or triplet excitons in a near-surface particle layer is studied. A detailed mathematical model is presented that accounts for electron excitation diffusive mobility and geometry of the system. The kinetic operator is given in the complete 9x9 basis of triplet- triplet pair spin states. Time dependencies of the singlet spin state population of the triplet-triplet pair and the dependence of the triplet-triplet annihilation magnetic response profile (magnetic reaction effect) from the magnetic field induction are obtained. It is found that the influence of a magnetic field gradient on the reaction yield dominates over the other known mechanisms of spin-dynamics in triplet- triplet pairs.
{"title":"SPIN-SELECTIVE INTERACTION OF TRIPLET-EXCITED MOLECULES ON THE SURFACE OF A FERROMAGNETIC NANOPARTICLE","authors":"M. Kucherenko","doi":"10.31489/2022no4/5-16","DOIUrl":"https://doi.org/10.31489/2022no4/5-16","url":null,"abstract":"Influence of a magnetic field generated by a ferromagnetic nanoparticle on the annihilation of triplet-excited organic molecules or triplet excitons in a near-surface particle layer is studied. A detailed mathematical model is presented that accounts for electron excitation diffusive mobility and geometry of the system. The kinetic operator is given in the complete 9x9 basis of triplet- triplet pair spin states. Time dependencies of the singlet spin state population of the triplet-triplet pair and the dependence of the triplet-triplet annihilation magnetic response profile (magnetic reaction effect) from the magnetic field induction are obtained. It is found that the influence of a magnetic field gradient on the reaction yield dominates over the other known mechanisms of spin-dynamics in triplet- triplet pairs.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47637403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article presents development of the architecture of the onboard control system. In particular, the hardware and circuit solutions in the development of the module are presented. Technical solutions, the concept of the mechanical layout of the onboard control system and block diagrams of the presented modules of the onboard complex are also discussed. Main functions of the on-board software are described in details, which will help in design and development of ultra-small artificial satellites. This article serves as a new approach for how to effectively configure and operate the on-board control system.
{"title":"DEVELOPMENT OF ONBOARD CONTROL SYSTEM ARCHITECTURE FOR NANOSATELLITES","authors":"K. Alipbayev","doi":"10.31489/2022no4/58-66","DOIUrl":"https://doi.org/10.31489/2022no4/58-66","url":null,"abstract":"This article presents development of the architecture of the onboard control system. In particular, the hardware and circuit solutions in the development of the module are presented. Technical solutions, the concept of the mechanical layout of the onboard control system and block diagrams of the presented modules of the onboard complex are also discussed. Main functions of the on-board software are described in details, which will help in design and development of ultra-small artificial satellites. This article serves as a new approach for how to effectively configure and operate the on-board control system.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44469263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
excitation by nanosecond laser pulses has been studied. It was shown that the maximum of stationary absorption exhibits as a wide structureless band with a maximum at about 520–540 nm. The transient absorption band of gold nanoparticles with a maximum at about 430 nm has a fine structure with a frequency of maxima of 6–8 nm and it does not depend on the size of the nanoparticles. The absorption duration decreases with a decrease in the average size of nanoparticles. The lifetime of transient absorption is equal to 23±2 and 19.5±2 ns for large and small particles, respectively. The nanosecond lifetime of the transient absorption of Au nanoparticles is the result of a prolonged relaxation process in the “interface of Au nanoparticle–solvent molecule” system as a manifestation of hindered heat exchange with the environment.
{"title":"TRANSIENT ABSORPTION OF GOLD NANOPARTICLES OF VARIOUS DIAMETERS","authors":"N. Ibrayev","doi":"10.31489/2022no4/73-77","DOIUrl":"https://doi.org/10.31489/2022no4/73-77","url":null,"abstract":"excitation by nanosecond laser pulses has been studied. It was shown that the maximum of stationary absorption exhibits as a wide structureless band with a maximum at about 520–540 nm. The transient absorption band of gold nanoparticles with a maximum at about 430 nm has a fine structure with a frequency of maxima of 6–8 nm and it does not depend on the size of the nanoparticles. The absorption duration decreases with a decrease in the average size of nanoparticles. The lifetime of transient absorption is equal to 23±2 and 19.5±2 ns for large and small particles, respectively. The nanosecond lifetime of the transient absorption of Au nanoparticles is the result of a prolonged relaxation process in the “interface of Au nanoparticle–solvent molecule” system as a manifestation of hindered heat exchange with the environment.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45516225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper a measuring analytical system for low-frequency noise spectroscopy is presented. The measuring system is adapted for the automated study of low-frequency noise spectra in electronic elements, components and semiconductor materials and structures. A distinctive feature of the proposed measuring system is an automated complex local and precise study of the dependence of the low-frequency noise spectra in the sample on electrical voltage and temperature. The frequency range is 0.001-10000 Hz, DC bias range is 0-50 V and the temperature range is 7-500 К. The measuring system is adapted for use with an atomic force microscope for local measurements of electronic materials and structures noise characteristics. The measuring system makes it possible to obtain a larger amount of experimental data, which makes it possible to draw comprehensive conclusions about the mechanisms and causes of noise generation in the test sample. The results of testing the operation of the measuring system are given as an example of the Schottky diode-like structure study.
{"title":"AUTOMATED MEASURING SYSTEM FOR INVESTIGATING TEMPERATURE DEPENDENCE OF LOW-FREQUENCY NOISE SPECTRA IN ELECTRONIC ELEMENTS AND STRUCTURES","authors":"A. Ermachikhin","doi":"10.31489/2022no4/51-57","DOIUrl":"https://doi.org/10.31489/2022no4/51-57","url":null,"abstract":"In this paper a measuring analytical system for low-frequency noise spectroscopy is presented. The measuring system is adapted for the automated study of low-frequency noise spectra in electronic elements, components and semiconductor materials and structures. A distinctive feature of the proposed measuring system is an automated complex local and precise study of the dependence of the low-frequency noise spectra in the sample on electrical voltage and temperature. The frequency range is 0.001-10000 Hz, DC bias range is 0-50 V and the temperature range is 7-500 К. The measuring system is adapted for use with an atomic force microscope for local measurements of electronic materials and structures noise characteristics. The measuring system makes it possible to obtain a larger amount of experimental data, which makes it possible to draw comprehensive conclusions about the mechanisms and causes of noise generation in the test sample. The results of testing the operation of the measuring system are given as an example of the Schottky diode-like structure study.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47646768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The assessment of the reliability of a mining and technological scheme, taking into account the stress state of mine workings, depends on a combination of mining and geological, technical and technological factors. The article demonstrates the creation of a model of a rock mass and a scheme for calculating the stress state based on modern methods of mechanics of a deformable solid body.The object of study is a single mine working of great length, passed through the rock parallel to the strike of the coal seam (field drift) and located in the zone of influence of the support pressure. Due to the fact that the field drift is laid in the soil of the formation, which is a layered stratum in the zone of influence of clearing operations, the predominant load is the bearing pressure on the formation. The areas of application of the methods of complex potentials of integral equations and their combinations in solving applied problems are determined. The data of mine (field) measurements and observations, laboratory experiments and their generalizations are taken into account both when setting tasks and assigning boundary conditions, and when checking the results obtained. The mixed problem of the theory of elasticity about the contact stress on half-strips with varying along the longitudinal axis was solved; moving away from the ends, deformative properties, when these half-strips are clamped with friction between the layered half-planes.
{"title":"INVESTIGATION OF THE STRESS STATE OF MINE WORKINGS USING METHODS OF DEFORMABLE SOLID MECHANICS","authors":"G. Shaikhova","doi":"10.31489/2022no4/68-72","DOIUrl":"https://doi.org/10.31489/2022no4/68-72","url":null,"abstract":"The assessment of the reliability of a mining and technological scheme, taking into account the stress state of mine workings, depends on a combination of mining and geological, technical and technological factors. The article demonstrates the creation of a model of a rock mass and a scheme for calculating the stress state based on modern methods of mechanics of a deformable solid body.The object of study is a single mine working of great length, passed through the rock parallel to the strike of the coal seam (field drift) and located in the zone of influence of the support pressure. Due to the fact that the field drift is laid in the soil of the formation, which is a layered stratum in the zone of influence of clearing operations, the predominant load is the bearing pressure on the formation. The areas of application of the methods of complex potentials of integral equations and their combinations in solving applied problems are determined. The data of mine (field) measurements and observations, laboratory experiments and their generalizations are taken into account both when setting tasks and assigning boundary conditions, and when checking the results obtained. The mixed problem of the theory of elasticity about the contact stress on half-strips with varying along the longitudinal axis was solved; moving away from the ends, deformative properties, when these half-strips are clamped with friction between the layered half-planes.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46002403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The power production industry is the main greenhouse gas emitter that makes its contribution to global warming. The greenhouse gas emission takes place in fuel production, transportation, and combustion. A prospective method for emission mitigation is the transition to organic fuel-burning facilities with small emissions by capturing carbon dioxide. Power consumption on the carbon dioxide capture remarkably reduces the efficiency of these facilities, which leads to increasing of fuel consumption and greenhouse gas emission because of the larger fuel production and transportation. Based on the material balance method, taking into account system effect of changes in efficiency and amount of fuel consumed, the paper estimated the carbon footprint over a twenty-year lifecycle for following thermal power plants types: combined cycle and oxy-fuel combustion plants for both natural gas and coal with internal gasification. It is shown that the transition to oxygen-fuel plants can reduce the carbon footprint near 90% for natural gas and near 75% for coal. The study also demonstrates the positive effect of carbon capture and storage system implementation for reducing carbon footprint near 75% for natural gas and near 70% for coal.
{"title":"CARBON FOOTPRINT COMPARATIVE ANALYSIS FOR EXISTING AND PROMISING THERMAL POWER PLANTS","authors":"N. Rogalev","doi":"10.31489/2022no4/34-43","DOIUrl":"https://doi.org/10.31489/2022no4/34-43","url":null,"abstract":"The power production industry is the main greenhouse gas emitter that makes its contribution to global warming. The greenhouse gas emission takes place in fuel production, transportation, and combustion. A prospective method for emission mitigation is the transition to organic fuel-burning facilities with small emissions by capturing carbon dioxide. Power consumption on the carbon dioxide capture remarkably reduces the efficiency of these facilities, which leads to increasing of fuel consumption and greenhouse gas emission because of the larger fuel production and transportation. Based on the material balance method, taking into account system effect of changes in efficiency and amount of fuel consumed, the paper estimated the carbon footprint over a twenty-year lifecycle for following thermal power plants types: combined cycle and oxy-fuel combustion plants for both natural gas and coal with internal gasification. It is shown that the transition to oxygen-fuel plants can reduce the carbon footprint near 90% for natural gas and near 75% for coal. The study also demonstrates the positive effect of carbon capture and storage system implementation for reducing carbon footprint near 75% for natural gas and near 70% for coal.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48545714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this article, the radiation defects induced in steatite ceramics type- SNC- irradiated with high doses of gamma-rays of 60Co source and mixed reactor nо-gamma-irradiation were studied using optical spectroscopy, i.e. diffuse reflection method. An analysis of the results of the diffuse reflection spectra showed that some structural defects are formed under gamma-irradiation. These are oxygen vacancies, unbound oxygen atoms, and E1 -centers (a three-coordinated silicon atom that has captured an electron) in the ultraviolet region of the spectrum. In the visible region of the spectrum, the types of hole centers are different. After decomposing the spectrum of the visible region into Gaussians, it was found that in this region of the spectrum, with no –gamma- irradiation of the reactor, in comparison with gamma-irradiation, various types of hole centers - (O-Me, Me-metal) are additionally formed. The efficiency of creating these structural defects in nо-gamma-reactor irradiated samples was higher compared to gamma irradiated samples.
{"title":"INFLUENCE OF IONIZING RADIATION ON THE DIFFUSE REFLECTION SPECTRA OF STEATITE CERAMICS SNC","authors":"M. Ashurov","doi":"10.31489/2022no4/22-27","DOIUrl":"https://doi.org/10.31489/2022no4/22-27","url":null,"abstract":"In this article, the radiation defects induced in steatite ceramics type- SNC- irradiated with high doses of gamma-rays of 60Co source and mixed reactor nо-gamma-irradiation were studied using optical spectroscopy, i.e. diffuse reflection method. An analysis of the results of the diffuse reflection spectra showed that some structural defects are formed under gamma-irradiation. These are oxygen vacancies, unbound oxygen atoms, and E1 -centers (a three-coordinated silicon atom that has captured an electron) in the ultraviolet region of the spectrum. In the visible region of the spectrum, the types of hole centers are different. After decomposing the spectrum of the visible region into Gaussians, it was found that in this region of the spectrum, with no –gamma- irradiation of the reactor, in comparison with gamma-irradiation, various types of hole centers - (O-Me, Me-metal) are additionally formed. The efficiency of creating these structural defects in nо-gamma-reactor irradiated samples was higher compared to gamma irradiated samples.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46588618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the world, over the years, the use of hydrocarbon resources is decreasing, and their place is being replaced by ecologically clean alternative and renewable energy sources. Therefore, the world is paying a lot of attention to improved devices based on photoelectric batteries. Conducting targeted scientific research in this direction is one of the urgent issues of the present time. This article presents the results of comparing the electrical parameters of photovoltaic and photothermal batteries based on them in natural conditions. The experiments were carried out on three traditional photoelectric batteries with different materials and constructions, as well as photothermal batteries made on their basis. All batteries are installed in a mobile structure, and two planes (reflectors) that reflect sunlight are installed along the long side of the device connecting the batteries. In the same conditions, the intensity of solar radiation is increased with the help of reflectors that return light to photoelectric and photothermal batteries. On the front surface of the photovoltaic batteries, a vertical (90) fall of the sun's rays is provided. As a result, their electrical parameters changed to different values depending on the type of material and construction. Compared to traditional photoelectric batteries, photothermal batteries produced 1.3-1.4 times more electricity depending on the type of material. In the results of the experiment, data were obtained on the open circuit voltage, short circuit current and power of photoelectric and photothermal batteries in hot climate conditions. According to results, the high indicators in terms of electrical parameters are monocrystalline photoelectric and photothermal batteries based on them.
{"title":"TESTING OF DIFFERENT MATERIAL TYPE PHOTOELECTRIC BATTERY AND PHOTOTHERMAL BATTERIES COMPOSED","authors":"M. Tursunov","doi":"10.31489/2022no4/44-50","DOIUrl":"https://doi.org/10.31489/2022no4/44-50","url":null,"abstract":"In the world, over the years, the use of hydrocarbon resources is decreasing, and their place is being replaced by ecologically clean alternative and renewable energy sources. Therefore, the world is paying a lot of attention to improved devices based on photoelectric batteries. Conducting targeted scientific research in this direction is one of the urgent issues of the present time. This article presents the results of comparing the electrical parameters of photovoltaic and photothermal batteries based on them in natural conditions. The experiments were carried out on three traditional photoelectric batteries with different materials and constructions, as well as photothermal batteries made on their basis. All batteries are installed in a mobile structure, and two planes (reflectors) that reflect sunlight are installed along the long side of the device connecting the batteries. In the same conditions, the intensity of solar radiation is increased with the help of reflectors that return light to photoelectric and photothermal batteries. On the front surface of the photovoltaic batteries, a vertical (90) fall of the sun's rays is provided. As a result, their electrical parameters changed to different values depending on the type of material and construction. Compared to traditional photoelectric batteries, photothermal batteries produced 1.3-1.4 times more electricity depending on the type of material. In the results of the experiment, data were obtained on the open circuit voltage, short circuit current and power of photoelectric and photothermal batteries in hot climate conditions. According to results, the high indicators in terms of electrical parameters are monocrystalline photoelectric and photothermal batteries based on them.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43752600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The influence of the anodizing voltage during synthesis on the specific surface area and on the photocatalytic activity of the TiO2 nanotube was studied. Films formed by titanium dioxide nanotubes were obtained on the surface of titanium foil by electrochemical anodizing. It has been found that an increase in the anodizing voltage from 20 V to 60 V leads to an increase in the inner and outer diameters of nanotubes, an increase in the growth rate and the interpore distance of nanotubes. The photocatalytic activity of the samples was evaluated by measuring the magnitude of the photoinduced current. The film produced at low voltage generated a current 3.5 times higher than the film produced at high voltage, and the degradation of the dye in the presence of the films was 75 and 38%, respectively, over the same period of time. An increase in the photocatalytic activity of the films is mainly associated with an increase in the specific surface area of the nanotubes. Thus, the values of the specific surface area of TiO2 nanotubes were determined by the method of low-temperature nitrogen adsorption. It has been established that with an increase in the anodizing voltage, the specific surface area of the films decreases.
{"title":"EFFECT OF ANODIZING VOLTAGE ON THE PHOTOCATALYTIC ACTIVITY OF FILMS FORMED BY TITANIUM DIOXIDE NANOTUBES","authors":"T. Serikov","doi":"10.31489/2022no4/28-33","DOIUrl":"https://doi.org/10.31489/2022no4/28-33","url":null,"abstract":"The influence of the anodizing voltage during synthesis on the specific surface area and on the photocatalytic activity of the TiO2 nanotube was studied. Films formed by titanium dioxide nanotubes were obtained on the surface of titanium foil by electrochemical anodizing. It has been found that an increase in the anodizing voltage from 20 V to 60 V leads to an increase in the inner and outer diameters of nanotubes, an increase in the growth rate and the interpore distance of nanotubes. The photocatalytic activity of the samples was evaluated by measuring the magnitude of the photoinduced current. The film produced at low voltage generated a current 3.5 times higher than the film produced at high voltage, and the degradation of the dye in the presence of the films was 75 and 38%, respectively, over the same period of time. An increase in the photocatalytic activity of the films is mainly associated with an increase in the specific surface area of the nanotubes. Thus, the values of the specific surface area of TiO2 nanotubes were determined by the method of low-temperature nitrogen adsorption. It has been established that with an increase in the anodizing voltage, the specific surface area of the films decreases.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47873987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Тhe most common method of manufacturing parts is metal pressure treatment, as a result of which the entire reserve of strength and ductility of the material is not exhausted. Therefore, the issues of the influence of plastic deformation on the cyclic durability and endurance limits of steel rings are relevant. In this article experimental studies of the effect of high pressure torsion in a die of new design on the evolution of the microstructure and the change of mechanical properties have been carried out. As a result, the fundamental possibility and efficiency of using the proposed method for the formation of ultrafine grained structure and increasing the strength properties of steel rings has been proved. Strain was carried out at ambient temperature in six passes. The strain resulted in an ultrafine-grained structure with an average grain size of 0.5 μm and a great number of large-angle boundaries. The strength properties of microalloyed steel increased almost threefold compared to the initial state, the microhardness also increased threefold, i.e. increased from 760 MPa in the initial state to 1935 MPa after strain. The greatest increase in strength properties occurred in the first 3 cycles of strain.
{"title":"EFFECT OF HIGH-PRESSURE TORSION ON MICROSTRUCTURE CHANGES IN MICROALLOYED STEEL","authors":"I. Volokitina","doi":"10.31489/2022no4/17-21","DOIUrl":"https://doi.org/10.31489/2022no4/17-21","url":null,"abstract":"Тhe most common method of manufacturing parts is metal pressure treatment, as a result of which the entire reserve of strength and ductility of the material is not exhausted. Therefore, the issues of the influence of plastic deformation on the cyclic durability and endurance limits of steel rings are relevant. In this article experimental studies of the effect of high pressure torsion in a die of new design on the evolution of the microstructure and the change of mechanical properties have been carried out. As a result, the fundamental possibility and efficiency of using the proposed method for the formation of ultrafine grained structure and increasing the strength properties of steel rings has been proved. Strain was carried out at ambient temperature in six passes. The strain resulted in an ultrafine-grained structure with an average grain size of 0.5 μm and a great number of large-angle boundaries. The strength properties of microalloyed steel increased almost threefold compared to the initial state, the microhardness also increased threefold, i.e. increased from 760 MPa in the initial state to 1935 MPa after strain. The greatest increase in strength properties occurred in the first 3 cycles of strain.","PeriodicalId":11789,"journal":{"name":"Eurasian Physical Technical Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46607436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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