The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.
{"title":"Features of defect nucleation in nanosized crystals with BCC lattice","authors":"K. Zolnikov, D. Kryzhevich, A. Korchuganov","doi":"10.1063/1.5132275","DOIUrl":"https://doi.org/10.1063/1.5132275","url":null,"abstract":"The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.The atomic mechanisms of nucleation and development of plasticity in an iron nanocrystal under uniaxial uniform tension along different crystallographic directions were studied. It was shown that a twin is formed in the nanocrystal under tension along the [112] direction. The direct and reverse structural transformations of the crystal lattice occur according to the BCC–FCC–BCC scheme on the front of twin propagation. A significant number of twins are formed under tension of the nanocrystal along the [110] direction. In this case, the BCC–FCC–BCC and BCC–HCP– BCC local structural transformations provide the propagation of twins in the nanocrystal body.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84809609","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}
Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.
{"title":"Surface modification of selective laser melted Ti-6Al-4V by ultrasonic impact treatment and electron beam irradiation","authors":"E. Sinyakova, S. Panin, A. Teresov","doi":"10.1063/1.5132203","DOIUrl":"https://doi.org/10.1063/1.5132203","url":null,"abstract":"Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91015586","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}
I. Glukhov, M. Golkovski, A. Mairambekova, M. Khimich, Y. Sharkeev
In present paper Ti-Nb alloys produced via high-energy powder metallurgy method were studied. Ti-Nb alloys were obtained in form of layers on Ti substrate. The energy source was an electron beam emitted to the atmosphere, penetrating into deep layers of the powder. Electron energy was 1.4 MeV. It is shown that it is possible to produce alloys with predictable elemental and phase compositions via relativistic electron beam. Depending on the content of Nb, such phases as α′, α″ or β are formed. Produced alloys are non-toxic for cells. Due to this, manufacturing of small medical implants from this material is possible.
{"title":"Biocompatible Ti-Nb alloys produced via relativistic electron beam in air atmosphere","authors":"I. Glukhov, M. Golkovski, A. Mairambekova, M. Khimich, Y. Sharkeev","doi":"10.1063/1.5131980","DOIUrl":"https://doi.org/10.1063/1.5131980","url":null,"abstract":"In present paper Ti-Nb alloys produced via high-energy powder metallurgy method were studied. Ti-Nb alloys were obtained in form of layers on Ti substrate. The energy source was an electron beam emitted to the atmosphere, penetrating into deep layers of the powder. Electron energy was 1.4 MeV. It is shown that it is possible to produce alloys with predictable elemental and phase compositions via relativistic electron beam. Depending on the content of Nb, such phases as α′, α″ or β are formed. Produced alloys are non-toxic for cells. Due to this, manufacturing of small medical implants from this material is possible.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89727601","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}
Plastic strain localization in single- and polycrystals of aluminum is investigated. A crystal plasticity formulation is introduced into the three-dimensional boundary-value problem solved numerically by ABAQUS. Three-dimensional polycrystalline microstructure generated by a step-by-step procedure is accounted for explicitly in calculations. Tension of single crystals with different orientations is simulated. The results are compared with those obtained for a polycrystalline microstructure, with the orientation of a single-crystalline grain in the center of the microstructure being varied. Plastic strain localization is shown to develop along active slip systems and to differ for single- and polycrystalline materials.
{"title":"A comparative analysis of plastic strain localization in aluminum single crystals and polycrystalline grains","authors":"R. Balokhonov, V. Romanova","doi":"10.1063/1.5131896","DOIUrl":"https://doi.org/10.1063/1.5131896","url":null,"abstract":"Plastic strain localization in single- and polycrystals of aluminum is investigated. A crystal plasticity formulation is introduced into the three-dimensional boundary-value problem solved numerically by ABAQUS. Three-dimensional polycrystalline microstructure generated by a step-by-step procedure is accounted for explicitly in calculations. Tension of single crystals with different orientations is simulated. The results are compared with those obtained for a polycrystalline microstructure, with the orientation of a single-crystalline grain in the center of the microstructure being varied. Plastic strain localization is shown to develop along active slip systems and to differ for single- and polycrystalline materials.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78403855","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}
A. Chumaevskii, A. Gusarova, L. Zhukov, V. Beloborodov, A. N. Ivanov
Tribological behavior of aluminum alloy at elevated temperatures tests is investigated. It is revealed that at increase in temperature the adhesive component in the process of friction increases up to certain value, after which there is a decrease in adhesion and decrease in setting of the counter body and sample material. The morphology of the friction surface varies from the friction paths with a stepped structure to the scaly structure and then to the smoothed state of the friction pathTribological behavior of aluminum alloy at elevated temperatures tests is investigated. It is revealed that at increase in temperature the adhesive component in the process of friction increases up to certain value, after which there is a decrease in adhesion and decrease in setting of the counter body and sample material. The morphology of the friction surface varies from the friction paths with a stepped structure to the scaly structure and then to the smoothed state of the friction path
{"title":"Regularities of tribological behavior of aluminum alloys at adhesive friction with increased temperature in the friction zone","authors":"A. Chumaevskii, A. Gusarova, L. Zhukov, V. Beloborodov, A. N. Ivanov","doi":"10.1063/1.5131928","DOIUrl":"https://doi.org/10.1063/1.5131928","url":null,"abstract":"Tribological behavior of aluminum alloy at elevated temperatures tests is investigated. It is revealed that at increase in temperature the adhesive component in the process of friction increases up to certain value, after which there is a decrease in adhesion and decrease in setting of the counter body and sample material. The morphology of the friction surface varies from the friction paths with a stepped structure to the scaly structure and then to the smoothed state of the friction pathTribological behavior of aluminum alloy at elevated temperatures tests is investigated. It is revealed that at increase in temperature the adhesive component in the process of friction increases up to certain value, after which there is a decrease in adhesion and decrease in setting of the counter body and sample material. The morphology of the friction surface varies from the friction paths with a stepped structure to the scaly structure and then to the smoothed state of the friction path","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78551776","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}
Products from aluminum-magnesium alloy were produced by electron-beam additive technology. In this work, the microstructure and mechanical properties of the entire height of the grown product were investigated. The study of the microstructure showed that the grown sample has inhomogeneities and microdefects. At the bottom area a large number of β-phase intermetallic compounds of the MgAl system were appearing and at the top area the amount of intermetallic compounds was noticeably less, but a large amount of pores was observed. Mechanical properties were determined by compression testing. The results of mechanical tests indicate that the highest strength of the material is observed in samples cut out near the substrate.Products from aluminum-magnesium alloy were produced by electron-beam additive technology. In this work, the microstructure and mechanical properties of the entire height of the grown product were investigated. The study of the microstructure showed that the grown sample has inhomogeneities and microdefects. At the bottom area a large number of β-phase intermetallic compounds of the MgAl system were appearing and at the top area the amount of intermetallic compounds was noticeably less, but a large amount of pores was observed. Mechanical properties were determined by compression testing. The results of mechanical tests indicate that the highest strength of the material is observed in samples cut out near the substrate.
{"title":"Investigation of inhomogeneity of mechanical properties of Al-Mg alloy printed by electron-beam method","authors":"N. Shamarin, V. Utyaganova, V. Beloborodov","doi":"10.1063/1.5132190","DOIUrl":"https://doi.org/10.1063/1.5132190","url":null,"abstract":"Products from aluminum-magnesium alloy were produced by electron-beam additive technology. In this work, the microstructure and mechanical properties of the entire height of the grown product were investigated. The study of the microstructure showed that the grown sample has inhomogeneities and microdefects. At the bottom area a large number of β-phase intermetallic compounds of the MgAl system were appearing and at the top area the amount of intermetallic compounds was noticeably less, but a large amount of pores was observed. Mechanical properties were determined by compression testing. The results of mechanical tests indicate that the highest strength of the material is observed in samples cut out near the substrate.Products from aluminum-magnesium alloy were produced by electron-beam additive technology. In this work, the microstructure and mechanical properties of the entire height of the grown product were investigated. The study of the microstructure showed that the grown sample has inhomogeneities and microdefects. At the bottom area a large number of β-phase intermetallic compounds of the MgAl system were appearing and at the top area the amount of intermetallic compounds was noticeably less, but a large amount of pores was observed. Mechanical properties were determined by compression testing. The results of mechanical tests indicate that the highest strength of the material is observed in samples cut out near the substrate.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79260132","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 the field experience of using chemical methods to improved/enhanced oil recovery (IOR/EOR) for the extraction of high-viscosity oil from a fractured reservoir, including in conjunction with thermal methods, i.e. steam injection. The results of pilot tests for 2016–2018 on Permian-Carboniferous deposits of high-viscosity oil at Usinsk oilfield of LLC LUKOIL-Komi are discussed. The tests were carried out by Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences, together with PermNIPIneft, branch of LLC LUKOIL-Engineering, and OSK Company. Several types of work were carried out at various wells, including blocking the water inflow for hot producing wells, various types of treatment for hot injection wells, including horizontal ones. The use of chemical compositions together with cyclic steam stimulation (CSS) is discussed. The results of treatment of cold wells not covered by thermal effects are also presented. Technologies using thermotropic gel-forming and oil-displacing compositions have shown their effectiveness in field conditions and have been recommended for industrial implementation.This article presents the field experience of using chemical methods to improved/enhanced oil recovery (IOR/EOR) for the extraction of high-viscosity oil from a fractured reservoir, including in conjunction with thermal methods, i.e. steam injection. The results of pilot tests for 2016–2018 on Permian-Carboniferous deposits of high-viscosity oil at Usinsk oilfield of LLC LUKOIL-Komi are discussed. The tests were carried out by Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences, together with PermNIPIneft, branch of LLC LUKOIL-Engineering, and OSK Company. Several types of work were carried out at various wells, including blocking the water inflow for hot producing wells, various types of treatment for hot injection wells, including horizontal ones. The use of chemical compositions together with cyclic steam stimulation (CSS) is discussed. The results of treatment of cold wells not covered by thermal effects are also presented. Technologies using thermotropic gel-for...
{"title":"Field experience of chemical IOR/EOR at Permian-Carboniferous deposit of Usinsk oilfield","authors":"I. Kuvshinov, V. Kuvshinov, L. Altunina","doi":"10.1063/1.5132061","DOIUrl":"https://doi.org/10.1063/1.5132061","url":null,"abstract":"This article presents the field experience of using chemical methods to improved/enhanced oil recovery (IOR/EOR) for the extraction of high-viscosity oil from a fractured reservoir, including in conjunction with thermal methods, i.e. steam injection. The results of pilot tests for 2016–2018 on Permian-Carboniferous deposits of high-viscosity oil at Usinsk oilfield of LLC LUKOIL-Komi are discussed. The tests were carried out by Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences, together with PermNIPIneft, branch of LLC LUKOIL-Engineering, and OSK Company. Several types of work were carried out at various wells, including blocking the water inflow for hot producing wells, various types of treatment for hot injection wells, including horizontal ones. The use of chemical compositions together with cyclic steam stimulation (CSS) is discussed. The results of treatment of cold wells not covered by thermal effects are also presented. Technologies using thermotropic gel-forming and oil-displacing compositions have shown their effectiveness in field conditions and have been recommended for industrial implementation.This article presents the field experience of using chemical methods to improved/enhanced oil recovery (IOR/EOR) for the extraction of high-viscosity oil from a fractured reservoir, including in conjunction with thermal methods, i.e. steam injection. The results of pilot tests for 2016–2018 on Permian-Carboniferous deposits of high-viscosity oil at Usinsk oilfield of LLC LUKOIL-Komi are discussed. The tests were carried out by Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences, together with PermNIPIneft, branch of LLC LUKOIL-Engineering, and OSK Company. Several types of work were carried out at various wells, including blocking the water inflow for hot producing wells, various types of treatment for hot injection wells, including horizontal ones. The use of chemical compositions together with cyclic steam stimulation (CSS) is discussed. The results of treatment of cold wells not covered by thermal effects are also presented. Technologies using thermotropic gel-for...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79637084","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}
A. Panin, M. Kazachenok, L. Kazantseva, S. Martynov, M. Korchagin
Microstructure and phase composition of the titanium matrix composite made from a pre-mixed powder blend of Ti–6Al–4V+TiB2 were studied. High energy planetary ball milling method was used both to obtain TiB2 powder and to mix Ti–6Al–4V matrix composite powder with 5 wt.% TiB2. Electron beam melting technology was used to build the parts of the titanium metal matrix composites. To modify the microstructure of additive manufactured TiB2/Ti–6Al–4V sample their surface layer was subjected to one-pass electron beam melting. It was shown that the microstructure of 3D- printed TiB2/Ti–6Al–4V sample consists of equiaxial prior β grains of approximately 200 µm in size with the acicular α phase. TiB phase formation in the as-build titanium matrix composite was found. Subsequent electron beam surface treatment decreased in the width of acicular α phase and increased in the volume fraction of β phase in the titanium matrix composite.Microstructure and phase composition of the titanium matrix composite made from a pre-mixed powder blend of Ti–6Al–4V+TiB2 were studied. High energy planetary ball milling method was used both to obtain TiB2 powder and to mix Ti–6Al–4V matrix composite powder with 5 wt.% TiB2. Electron beam melting technology was used to build the parts of the titanium metal matrix composites. To modify the microstructure of additive manufactured TiB2/Ti–6Al–4V sample their surface layer was subjected to one-pass electron beam melting. It was shown that the microstructure of 3D- printed TiB2/Ti–6Al–4V sample consists of equiaxial prior β grains of approximately 200 µm in size with the acicular α phase. TiB phase formation in the as-build titanium matrix composite was found. Subsequent electron beam surface treatment decreased in the width of acicular α phase and increased in the volume fraction of β phase in the titanium matrix composite.
{"title":"Electron beam additive manufacturing of TiB2/Ti–6Al–4V composite","authors":"A. Panin, M. Kazachenok, L. Kazantseva, S. Martynov, M. Korchagin","doi":"10.1063/1.5132130","DOIUrl":"https://doi.org/10.1063/1.5132130","url":null,"abstract":"Microstructure and phase composition of the titanium matrix composite made from a pre-mixed powder blend of Ti–6Al–4V+TiB2 were studied. High energy planetary ball milling method was used both to obtain TiB2 powder and to mix Ti–6Al–4V matrix composite powder with 5 wt.% TiB2. Electron beam melting technology was used to build the parts of the titanium metal matrix composites. To modify the microstructure of additive manufactured TiB2/Ti–6Al–4V sample their surface layer was subjected to one-pass electron beam melting. It was shown that the microstructure of 3D- printed TiB2/Ti–6Al–4V sample consists of equiaxial prior β grains of approximately 200 µm in size with the acicular α phase. TiB phase formation in the as-build titanium matrix composite was found. Subsequent electron beam surface treatment decreased in the width of acicular α phase and increased in the volume fraction of β phase in the titanium matrix composite.Microstructure and phase composition of the titanium matrix composite made from a pre-mixed powder blend of Ti–6Al–4V+TiB2 were studied. High energy planetary ball milling method was used both to obtain TiB2 powder and to mix Ti–6Al–4V matrix composite powder with 5 wt.% TiB2. Electron beam melting technology was used to build the parts of the titanium metal matrix composites. To modify the microstructure of additive manufactured TiB2/Ti–6Al–4V sample their surface layer was subjected to one-pass electron beam melting. It was shown that the microstructure of 3D- printed TiB2/Ti–6Al–4V sample consists of equiaxial prior β grains of approximately 200 µm in size with the acicular α phase. TiB phase formation in the as-build titanium matrix composite was found. Subsequent electron beam surface treatment decreased in the width of acicular α phase and increased in the volume fraction of β phase in the titanium matrix composite.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84556148","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}
Microstructural characteristics of alumina-based porous ceramics are studied using scanning electron microscopy and X-ray analysis. Ceramic samples obtained by slip casting of commercially pure Al2O3 powder and sintered at the four temperatures 1300, 1400, 1500, and 1600 °C are studied. The three-point bending strength is determined for all the samples. A detailed microstructural analysis of the samples is carried out. Porosity of the samples, grain and pore size are found. The influence of structural features of the samples on their physicomechanical characteristics is investigated.Microstructural characteristics of alumina-based porous ceramics are studied using scanning electron microscopy and X-ray analysis. Ceramic samples obtained by slip casting of commercially pure Al2O3 powder and sintered at the four temperatures 1300, 1400, 1500, and 1600 °C are studied. The three-point bending strength is determined for all the samples. A detailed microstructural analysis of the samples is carried out. Porosity of the samples, grain and pore size are found. The influence of structural features of the samples on their physicomechanical characteristics is investigated.
{"title":"Microstructure of porous ceramics sintered at different temperatures","authors":"A. Kulkov, V. Shadrin, S. O. Kasparyan","doi":"10.1063/1.5132059","DOIUrl":"https://doi.org/10.1063/1.5132059","url":null,"abstract":"Microstructural characteristics of alumina-based porous ceramics are studied using scanning electron microscopy and X-ray analysis. Ceramic samples obtained by slip casting of commercially pure Al2O3 powder and sintered at the four temperatures 1300, 1400, 1500, and 1600 °C are studied. The three-point bending strength is determined for all the samples. A detailed microstructural analysis of the samples is carried out. Porosity of the samples, grain and pore size are found. The influence of structural features of the samples on their physicomechanical characteristics is investigated.Microstructural characteristics of alumina-based porous ceramics are studied using scanning electron microscopy and X-ray analysis. Ceramic samples obtained by slip casting of commercially pure Al2O3 powder and sintered at the four temperatures 1300, 1400, 1500, and 1600 °C are studied. The three-point bending strength is determined for all the samples. A detailed microstructural analysis of the samples is carried out. Porosity of the samples, grain and pore size are found. The influence of structural features of the samples on their physicomechanical characteristics is investigated.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81588248","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}
A. Fedoseeva, I. Nikitin, A. Fedoseev, N. Dudova, R. Kaibyshev
Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 650°C with a strain rate of 2×10−3 s−1. Insignificant increment in ultimate tensile strength and yield strength was revealed in Ta-containing 12%Cr steel.Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 6...
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