Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-110-2-36-43
A. V. Krasikov, M. Markov, M. Merkulova, M. Staritsyn
Calorimetric studies show that the nanocrystalline coating Ni–37 wt. %W produced by electrodeposition does not undergo phase transformations up to a temperature of 1000°C. Laser processing affects the properties of coatings, and in the selected mode leads to a significant grain growth in the coating, without affecting its chemical composition. At a certain energy input, a notable increase in the microhardness of the coating was revealed.
{"title":"Strengthening of A Ni–W coating by laser processing","authors":"A. V. Krasikov, M. Markov, M. Merkulova, M. Staritsyn","doi":"10.22349/1994-6716-2022-110-2-36-43","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-36-43","url":null,"abstract":"Calorimetric studies show that the nanocrystalline coating Ni–37 wt. %W produced by electrodeposition does not undergo phase transformations up to a temperature of 1000°C. Laser processing affects the properties of coatings, and in the selected mode leads to a significant grain growth in the coating, without affecting its chemical composition. At a certain energy input, a notable increase in the microhardness of the coating was revealed.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76170446","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-110-2-05-14
T. V. Knyazyuk, G. D. Motovilina, N. S. Novoskoltsev, N. A. Kondratiev
For the production of sheets with a thickness of 5 and 15 mm from cold-resistant steel with a guaranteed yield strength of 420 MPa, continuous rolling was developed and tested in laboratory conditions. The present study considers the influence of the parameters of thermal deformation treatment (temperature of the end of rolling and cooling rate) on the formation of the final microstructure. The mechanical properties of the sheets were analyzed taking into account the formed structural features. Technological recommendations for hot rolling of low-carbon low-alloy steel sheets with a guaranteed yield strength of 420 MPa are proposed.
{"title":"Dependence of the microstructure and mechanical properties of cold-resistant steel sheets with a guaranteed yield strength of 420 MPa on the thermomechanical processing","authors":"T. V. Knyazyuk, G. D. Motovilina, N. S. Novoskoltsev, N. A. Kondratiev","doi":"10.22349/1994-6716-2022-110-2-05-14","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-05-14","url":null,"abstract":"For the production of sheets with a thickness of 5 and 15 mm from cold-resistant steel with a guaranteed yield strength of 420 MPa, continuous rolling was developed and tested in laboratory conditions. The present study considers the influence of the parameters of thermal deformation treatment (temperature of the end of rolling and cooling rate) on the formation of the final microstructure. The mechanical properties of the sheets were analyzed taking into account the formed structural features. Technological recommendations for hot rolling of low-carbon low-alloy steel sheets with a guaranteed yield strength of 420 MPa are proposed.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73908321","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-111-3-41-48
A. Memetova, A. Zelenin, N. Memetov, T. Pasko, A. Gerasimova, D. Tarov
In this study, we synthesized samples of nanoporous carbon materials (NCM) from polymer raw materials. The influence of the conditions of the synthesis process (the mass ratio of the activating agent to the precursor) on the structure of the obtained samples has been studied. Varying the mass ratio of the activating agent to the precursor made it possible to obtain microporous, micromesoporous, and mesoporous carbon materials. Methane adsorption has been researched in a wide pressure range. The highest adsorption of methane, equal to ≈ 20 mmol/g at 100 bar and 298 K, is achieved on a sample with a ratio of the activating agent KOH to carbonized precursor 6:1 (6NCM).
{"title":"Synthesis of nanoporous functional materials for the chemical industry","authors":"A. Memetova, A. Zelenin, N. Memetov, T. Pasko, A. Gerasimova, D. Tarov","doi":"10.22349/1994-6716-2022-111-3-41-48","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-41-48","url":null,"abstract":"In this study, we synthesized samples of nanoporous carbon materials (NCM) from polymer raw materials. The influence of the conditions of the synthesis process (the mass ratio of the activating agent to the precursor) on the structure of the obtained samples has been studied. Varying the mass ratio of the activating agent to the precursor made it possible to obtain microporous, micromesoporous, and mesoporous carbon materials. Methane adsorption has been researched in a wide pressure range. The highest adsorption of methane, equal to ≈ 20 mmol/g at 100 bar and 298 K, is achieved on a sample with a ratio of the activating agent KOH to carbonized precursor 6:1 (6NCM).","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90957040","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-110-2-90-101
M. I. Valueva, I. V. Zelenina, A. V. Nacharkina, S. L. Lonsky
The article studies influence of laboratory-simulated external influencing operational factors – water and moisture saturation, combined effect of elevated temperature and humidity, exposure in a tropical climate chamber on the properties of high-temperature carbon fiber based on a melted thermosetting polyimide binder. Studies of the structure, glass transition temperature and elastic-strength characteristics of carbon fiber after exposure were carried out, the change in the mass of carbon fiber samples during long-term exposure to water and moisture was estimated.
{"title":"Influence of thermal moisture impact on the structure and properties of polyimide carbon fiber","authors":"M. I. Valueva, I. V. Zelenina, A. V. Nacharkina, S. L. Lonsky","doi":"10.22349/1994-6716-2022-110-2-90-101","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-90-101","url":null,"abstract":"The article studies influence of laboratory-simulated external influencing operational factors – water and moisture saturation, combined effect of elevated temperature and humidity, exposure in a tropical climate chamber on the properties of high-temperature carbon fiber based on a melted thermosetting polyimide binder. Studies of the structure, glass transition temperature and elastic-strength characteristics of carbon fiber after exposure were carried out, the change in the mass of carbon fiber samples during long-term exposure to water and moisture was estimated.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74155814","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-110-2-44-57
A. Mozhayko, D. A. Gerashchenkov, M. Staritsyn
Laser surface treatment is a complex process in which, under the influence of a laser, the surface of material melts, while changing its structure and properties. In this paper, we consider the simulation of the process and present the results of studying the influence of laser processing parameters on the dimensions of the melt pool. The main purpose of the study is to reveal the dependence of the depth of the melt pool, namely the thickness of the layer in which the mixing process of the components takes place, on the laser parameters. As a result of the study, it was found that after laser treatment of the surface of samples with a coating thickness of 20, 40 and 80 μm at a beam speed of 100 mm/s and power of 180 W, the coating material is completely mixed with the substrate. It is also shown that with the laser travel speed 400 and 800 mm/s and the power 180 W, there is no mixing of the components in the impact zone, since the energy input is not enough.
{"title":"Experimental and theoretical investigation of the formation of the surface layer highly alloyed with aluminum","authors":"A. Mozhayko, D. A. Gerashchenkov, M. Staritsyn","doi":"10.22349/1994-6716-2022-110-2-44-57","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-44-57","url":null,"abstract":"Laser surface treatment is a complex process in which, under the influence of a laser, the surface of material melts, while changing its structure and properties. In this paper, we consider the simulation of the process and present the results of studying the influence of laser processing parameters on the dimensions of the melt pool. The main purpose of the study is to reveal the dependence of the depth of the melt pool, namely the thickness of the layer in which the mixing process of the components takes place, on the laser parameters. As a result of the study, it was found that after laser treatment of the surface of samples with a coating thickness of 20, 40 and 80 μm at a beam speed of 100 mm/s and power of 180 W, the coating material is completely mixed with the substrate. It is also shown that with the laser travel speed 400 and 800 mm/s and the power 180 W, there is no mixing of the components in the impact zone, since the energy input is not enough.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79714073","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-111-3-5-16
A. Kochubey, P. L. Zhuravleva
Axisymmetric hot compression experiments of Mg–Al–Zn specimens in intervals of temperature 250–450 °С and deformation rate (10-3-5)·10–1 s–1 were carried out. Structure formation was studied by optical microscopy. Macroscopically localized strain of cylindrical specimens depending on temperature, strain rates and initial grain size (400 μm and 1400 μm) are investigated. Localized strain diagrams for different initial grain size can be used for development and optimization of hot processing technology parameters are plotting. It is shown that increase of the grain size direct to strain localization increment tendency.
{"title":"Behavior of localized strain under hot compression of cast specimen from Mg–Al–Zn alloy","authors":"A. Kochubey, P. L. Zhuravleva","doi":"10.22349/1994-6716-2022-111-3-5-16","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-5-16","url":null,"abstract":"Axisymmetric hot compression experiments of Mg–Al–Zn specimens in intervals of temperature 250–450 °С and deformation rate (10-3-5)·10–1 s–1 were carried out. Structure formation was studied by optical microscopy. Macroscopically localized strain of cylindrical specimens depending on temperature, strain rates and initial grain size (400 μm and 1400 μm) are investigated. Localized strain diagrams for different initial grain size can be used for development and optimization of hot processing technology parameters are plotting. It is shown that increase of the grain size direct to strain localization increment tendency.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88927962","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-111-3-49-58
O. Sorokin, I. O. Belyachenkov, A. S. Chainikova, S. V. Zhitnyuk, P. Medvedev
The influence of porous SiC preforms densities for the siliconizing process on the structure and phase constitution of graphite-loaded reaction-bonded SiC (G-SiSiC) was studied. It was found that varying the densities of porous SiC preforms containing artificial graphite of similar grain size with the dimensions less than 25 mm (in height or diameter) can lead to the G-SiSiC samples with low free Si content (less 4 wt.%.). It was also shown that reaction sintering of G-SiSiC samples with the optimized densities during the siliconizing process results in the formation of a dense fine-grained SiC layer. Moreover, during the siliconizing process, a dense SiC gradient matrix is formed in which graphite and Si inclusions are uniformly dispersed in bulk.
{"title":"Structure and phase constitution of graphite-loaded reaction-bonded sic","authors":"O. Sorokin, I. O. Belyachenkov, A. S. Chainikova, S. V. Zhitnyuk, P. Medvedev","doi":"10.22349/1994-6716-2022-111-3-49-58","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-49-58","url":null,"abstract":"The influence of porous SiC preforms densities for the siliconizing process on the structure and phase constitution of graphite-loaded reaction-bonded SiC (G-SiSiC) was studied. It was found that varying the densities of porous SiC preforms containing artificial graphite of similar grain size with the dimensions less than 25 mm (in height or diameter) can lead to the G-SiSiC samples with low free Si content (less 4 wt.%.). It was also shown that reaction sintering of G-SiSiC samples with the optimized densities during the siliconizing process results in the formation of a dense fine-grained SiC layer. Moreover, during the siliconizing process, a dense SiC gradient matrix is formed in which graphite and Si inclusions are uniformly dispersed in bulk.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"129 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81823409","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-110-2-28-35
D. A. Gerashchenkov, E. Y. Gerashchenkova, A. Mozhayko, A. Makarov, A. Belyakov, R. Y. Bystrov
The results of a study of intermetallic coatings of the Al–Ti and Ni–Ti systems obtained using the method of cold gas-dynamic spraying on a titanium alloy substrate and laser processing are presented. The precursor coating was obtained by cold spray deposition of aluminum and nickel and then it was processed by a laser. The change in the composition and properties of the coating under different laser processing modes is shown. The structure and microhardness of the coating are investigated, and the results of X-ray phase analysis are presented.
{"title":"Study of the composition and properties of the intermetallic layer of Al–Ti and Ni–Ti obtained on a titanium alloy for laser processing","authors":"D. A. Gerashchenkov, E. Y. Gerashchenkova, A. Mozhayko, A. Makarov, A. Belyakov, R. Y. Bystrov","doi":"10.22349/1994-6716-2022-110-2-28-35","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-28-35","url":null,"abstract":"The results of a study of intermetallic coatings of the Al–Ti and Ni–Ti systems obtained using the method of cold gas-dynamic spraying on a titanium alloy substrate and laser processing are presented. The precursor coating was obtained by cold spray deposition of aluminum and nickel and then it was processed by a laser. The change in the composition and properties of the coating under different laser processing modes is shown. The structure and microhardness of the coating are investigated, and the results of X-ray phase analysis are presented.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87232435","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2021-105-1-81-89
T. Borukaev, L. I. Kitieva
Polymer composites based on low-density polyethylene and polybutylene terephthalate have been obtained. It has been established that the use of a compatibilizer makes it possible to improve the compatibility of initial thermodynamically incompatible polymers. It is shown that polymer composites containing a compatibilizer are superior in their physical and mechanical characteristics to the original polymers and mixtures based on them.
{"title":"Physical and mechanical properties of composites low density polyethylene/polybutylene terephthalate/compatibilizer","authors":"T. Borukaev, L. I. Kitieva","doi":"10.22349/1994-6716-2021-105-1-81-89","DOIUrl":"https://doi.org/10.22349/1994-6716-2021-105-1-81-89","url":null,"abstract":"Polymer composites based on low-density polyethylene and polybutylene terephthalate have been obtained. It has been established that the use of a compatibilizer makes it possible to improve the compatibility of initial thermodynamically incompatible polymers. It is shown that polymer composites containing a compatibilizer are superior in their physical and mechanical characteristics to the original polymers and mixtures based on them.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72989107","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}
Pub Date : 2022-10-31DOI: 10.22349/1994-6716-2022-111-3-17-28
D. Priyatkin, A. Artemyev, V. Lysak
Compositions of flux-cored wires for electric arc surfacing of alloys of the Fe-Cr-Ni-Mn-Mo-Ti-Nb-C alloy system, resistant to high-temperature gas-abrasive wear, were developed. The deposited alloys were studied by optical and electron microscopy, X-ray mi-crospectral and X-ray diffraction analysis. The influence of the carbon content in the alloy on its structural-phase composition, hardness, and wear resistance at normal and elevated temperatures up to 600°C was revealed. It was established that increasing the carbon content in the alloy from 1.2 to 2.8 wt. % leads to increasing the volume fraction of (Cr, Fe)xCy carbides involved in the formation of the eutectic austenite-carbide matrix of the alloy at 6 times. Their morphology also changes from (Fe, Cr)23C6 to (Fe, Cr)7C3. In this case, the content of (Ti, Nb, Mo)xCy and MoxC carbides in the alloy changes insignificantly, and their average size increases by 10%. It has been established that the formation of a composite structure in the alloy contributes to its high resistance to gas-abrasive wear at a temperature of 600°C. The wear resistance of the developed alloy is comparable to a foreign industrial analogue at a much lower cost.
{"title":"Investigation of the surfaced metal of the Fe–Cr–Ni–Mn–Mo–Ti–Nb–C system for operation under high-temperature gas-abrasive wear","authors":"D. Priyatkin, A. Artemyev, V. Lysak","doi":"10.22349/1994-6716-2022-111-3-17-28","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-17-28","url":null,"abstract":"Compositions of flux-cored wires for electric arc surfacing of alloys of the Fe-Cr-Ni-Mn-Mo-Ti-Nb-C alloy system, resistant to high-temperature gas-abrasive wear, were developed. The deposited alloys were studied by optical and electron microscopy, X-ray mi-crospectral and X-ray diffraction analysis. The influence of the carbon content in the alloy on its structural-phase composition, hardness, and wear resistance at normal and elevated temperatures up to 600°C was revealed. It was established that increasing the carbon content in the alloy from 1.2 to 2.8 wt. % leads to increasing the volume fraction of (Cr, Fe)xCy carbides involved in the formation of the eutectic austenite-carbide matrix of the alloy at 6 times. Their morphology also changes from (Fe, Cr)23C6 to (Fe, Cr)7C3. In this case, the content of (Ti, Nb, Mo)xCy and MoxC carbides in the alloy changes insignificantly, and their average size increases by 10%. It has been established that the formation of a composite structure in the alloy contributes to its high resistance to gas-abrasive wear at a temperature of 600°C. The wear resistance of the developed alloy is comparable to a foreign industrial analogue at a much lower cost.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78647079","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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