Pub Date : 1900-01-01DOI: 10.30791/0015-3214-2021-2-56-62
G. Kozhemyakin, Y. Belov, М. K. Trufanova, О. Е. Bryl
The conditions have been developed for obtaining of gallium (Ga) nanoparticles by thermal evaporation method in an argon atmosphere on glass carbon substrates. Ga particles research was carried out by the developed intelligent analysis method of the images of the micrographs obtained under a scanning electron microscope. It is shown, that temperature of glass carbon substrate and the condensation time of the melt determine number of the nanoparticles and microparticles. Ga nanoparticles with 10 – 100 nm sizes and microparticles with up to 500 nm sizes were formed on the substrates with the condensation time of 10 – 20 s. Ga nanoparticles had a shape close to spherical, and their amount increased with the increase of the condensation time. The increase of the substrate temperature from 118 to 124 °С provided the decrease of 20 % in the average sizes of most Ga nanoparticles and the increase of their number by a factor of 7 – 20.
{"title":"Formation of gallium nanoparticles by thermal evaporation method","authors":"G. Kozhemyakin, Y. Belov, М. K. Trufanova, О. Е. Bryl","doi":"10.30791/0015-3214-2021-2-56-62","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-2-56-62","url":null,"abstract":"The conditions have been developed for obtaining of gallium (Ga) nanoparticles by thermal evaporation method in an argon atmosphere on glass carbon substrates. Ga particles research was carried out by the developed intelligent analysis method of the images of the micrographs obtained under a scanning electron microscope. It is shown, that temperature of glass carbon substrate and the condensation time of the melt determine number of the nanoparticles and microparticles. Ga nanoparticles with 10 – 100 nm sizes and microparticles with up to 500 nm sizes were formed on the substrates with the condensation time of 10 – 20 s. Ga nanoparticles had a shape close to spherical, and their amount increased with the increase of the condensation time. The increase of the substrate temperature from 118 to 124 °С provided the decrease of 20 % in the average sizes of most Ga nanoparticles and the increase of their number by a factor of 7 – 20.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127183831","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-6-52-61
M. Isaenkova, Y. Perlovich, A. Yudin, A. Rubanov, N. Zhuravlev, M. Saveliev, A. Dub
{"title":"Regularities of formation of the lattice structures produced by the method of selective laser melting of 316L steel powder","authors":"M. Isaenkova, Y. Perlovich, A. Yudin, A. Rubanov, N. Zhuravlev, M. Saveliev, A. Dub","doi":"10.30791/0015-3214-2019-6-52-61","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-6-52-61","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"12 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130489977","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-4-21-26
O. Elagina, V. Gusev, A. G. Buklakov, N. S. Nesterenko, K. O. Tomsky
{"title":"Deposition of pseudo-alloy coating by electroarc metallization method","authors":"O. Elagina, V. Gusev, A. G. Buklakov, N. S. Nesterenko, K. O. Tomsky","doi":"10.30791/0015-3214-2019-4-21-26","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-4-21-26","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127958006","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 : 1900-01-01DOI: 10.30791/0015-3214-2021-3-79-82
V. P. Babaev, S. V. Zaitsev, K. A. Inshakova, A. N. Shaykin
A computational and experimental estimation of the magnitude of forces acting in a high-intensity electric field on elements of nanoconstructions with a high surface curvature is made. Depending on the magnitude of the electric potential and vacuum conditions, these forces can vary both in magnitude and direction over a wide range. They can cause structural damage, as well as provoke unwanted electrical discharges. The possibilities of useful application of these effects are analyzed.
{"title":"Mechanical effect of an electric field on nanostructure elements","authors":"V. P. Babaev, S. V. Zaitsev, K. A. Inshakova, A. N. Shaykin","doi":"10.30791/0015-3214-2021-3-79-82","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-3-79-82","url":null,"abstract":"A computational and experimental estimation of the magnitude of forces acting in a high-intensity electric field on elements of nanoconstructions with a high surface curvature is made. Depending on the magnitude of the electric potential and vacuum conditions, these forces can vary both in magnitude and direction over a wide range. They can cause structural damage, as well as provoke unwanted electrical discharges. The possibilities of useful application of these effects are analyzed.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125504922","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-1-55-70
Y. Tumanov
{"title":"Directions of development of a non-waste plasma-electromagnetic technology for the reduction of d- and f-metals from refined volatile fluoride raw materials: Scientific and technical principles, technological evolution","authors":"Y. Tumanov","doi":"10.30791/0015-3214-2019-1-55-70","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-1-55-70","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126466713","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 : 1900-01-01DOI: 10.30791/0015-3214-2021-3-69-78
A. A. Yakushkin, As “Src Rf Triniti”
Three directions of the establishment of accident tolerant fuel cladding for light water reactors are actively exploring at present: 1) replacement zirconium alloy E110 for more corrosion-resistant material in accident operation conditions; 2) surface dispersion hardening or doping of the zirconium cladding of fuel element; 3) deposition a corrosion-resistant coating to the fuel cladding. The first direction requires significant and irreversible changes in fuel rod production technology and has long-term prospects. Conversely, the second direction suggest minimal changes in the fuel rod production technology, however, it has no significant effect on the high temperature oxidation kinetics of fuel claddings in steam. Using of a corrosion resistant coating results in a significant change in the high temperature oxidation kinetics of the zirconium alloy, (no transition to linear oxidation) that is related to maintaining the continuity of the oxide layer formed during oxidation. The issue provides a brief overview of the current state of research in the field of fuel, tolerant to the effects of coolant in emergency situations.
{"title":"On the problems of creating shells of fuel rods from zirconium alloys for tolerant fuel","authors":"A. A. Yakushkin, As “Src Rf Triniti”","doi":"10.30791/0015-3214-2021-3-69-78","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-3-69-78","url":null,"abstract":"Three directions of the establishment of accident tolerant fuel cladding for light water reactors are actively exploring at present: 1) replacement zirconium alloy E110 for more corrosion-resistant material in accident operation conditions; 2) surface dispersion hardening or doping of the zirconium cladding of fuel element; 3) deposition a corrosion-resistant coating to the fuel cladding. The first direction requires significant and irreversible changes in fuel rod production technology and has long-term prospects. Conversely, the second direction suggest minimal changes in the fuel rod production technology, however, it has no significant effect on the high temperature oxidation kinetics of fuel claddings in steam. Using of a corrosion resistant coating results in a significant change in the high temperature oxidation kinetics of the zirconium alloy, (no transition to linear oxidation) that is related to maintaining the continuity of the oxide layer formed during oxidation. The issue provides a brief overview of the current state of research in the field of fuel, tolerant to the effects of coolant in emergency situations.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116716241","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 : 1900-01-01DOI: 10.30791/0015-3214-2022-2-65-70
V. Shepelevich, O. Gusakova, S. V. Husakova
The alloy Bi32In41Sn27 was produced by fusing the components in quarts ampoules. A piece of alloy of 0.2 g was heated and injected onto the inner polished surface of rapidly rotating copper cylinder with a diameter 20 cm. The alloy was solidified in the form of a foil up10 cm long and up to10 mm wide. Foils with a thickness of 30 – 100 micrometers were used for the study. The chemical compositions of the foil in the layers in contact with surface of the mold and the atmosphere are coincided within the measurement error. A rapidly solidified alloy Bi32In41Sn27 consists of ε-phase (BiIn) and γ-phase (Sn4In) having a dispersed structure. The average value of the chords dγ of random secants located on the sections of γ-phase and average value of the specific surface area of the interphase boundary Sε – γ, formed by ε- and γ-phases, depend on the expose time t at room temperature; their properties are described by equations d = 0,58 + 0,29lnt and Sε – γ = 2,9 − 0,43lnt, correspondly. The alloy foils have a microcrystalline structure and well-defined texture (0001) of the γ-phase and poorly expressed double (211) + (112) of the ε-phase. Texture are persist during annealing 60 °С for 2 hours. The microhardness of the alloy Bi32In41Sn27 foils monotonically increases with increasing expose time at room temperature and reaches saturation. Subsequent isothermal annealing at 60 °С leads to a microhardness value equal to it of massive sample. The distribution of components in the solder joint between copper plates was investigated. Indium and tin diffuse into the copper plates. The depth of penetration of copper into the joint reaches 3 micrometers. When the soldered copper plates are strained, the breakdown on the junction occurs at 790 N and absolute value of the deformation is 0.8 mm. The conducted investigations of copper solder joints indicate the possible practical use of the alloy Bi32In41Sn27 foil as a solder.
{"title":"Structure and properties of rapidly solidified foils of triple Bi – In – Sn alloy and solder joint based on it","authors":"V. Shepelevich, O. Gusakova, S. V. Husakova","doi":"10.30791/0015-3214-2022-2-65-70","DOIUrl":"https://doi.org/10.30791/0015-3214-2022-2-65-70","url":null,"abstract":"The alloy Bi32In41Sn27 was produced by fusing the components in quarts ampoules. A piece of alloy of 0.2 g was heated and injected onto the inner polished surface of rapidly rotating copper cylinder with a diameter 20 cm. The alloy was solidified in the form of a foil up10 cm long and up to10 mm wide. Foils with a thickness of 30 – 100 micrometers were used for the study. The chemical compositions of the foil in the layers in contact with surface of the mold and the atmosphere are coincided within the measurement error. A rapidly solidified alloy Bi32In41Sn27 consists of ε-phase (BiIn) and γ-phase (Sn4In) having a dispersed structure. The average value of the chords dγ of random secants located on the sections of γ-phase and average value of the specific surface area of the interphase boundary Sε – γ, formed by ε- and γ-phases, depend on the expose time t at room temperature; their properties are described by equations d = 0,58 + 0,29lnt and Sε – γ = 2,9 − 0,43lnt, correspondly. The alloy foils have a microcrystalline structure and well-defined texture (0001) of the γ-phase and poorly expressed double (211) + (112) of the ε-phase. Texture are persist during annealing 60 °С for 2 hours. The microhardness of the alloy Bi32In41Sn27 foils monotonically increases with increasing expose time at room temperature and reaches saturation. Subsequent isothermal annealing at 60 °С leads to a microhardness value equal to it of massive sample. The distribution of components in the solder joint between copper plates was investigated. Indium and tin diffuse into the copper plates. The depth of penetration of copper into the joint reaches 3 micrometers. When the soldered copper plates are strained, the breakdown on the junction occurs at 790 N and absolute value of the deformation is 0.8 mm. The conducted investigations of copper solder joints indicate the possible practical use of the alloy Bi32In41Sn27 foil as a solder.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121679466","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-5-14-20
A. Grebennikov, A. I. Bocharov, S. B. Kushchev, D. Serikov, A. B. Kostyuchenko, E. Fedorova, I. V. Izvekova, I. Safonov, Military Educational
{"title":"Effect of pulsed photon treatment on electrophysical and thermal properties of n-type solid solution on the base of Bi2Te3-Bi2Se3. I. Electrophysical characteristics","authors":"A. Grebennikov, A. I. Bocharov, S. B. Kushchev, D. Serikov, A. B. Kostyuchenko, E. Fedorova, I. V. Izvekova, I. Safonov, Military Educational","doi":"10.30791/0015-3214-2019-5-14-20","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-5-14-20","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121715237","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 : 1900-01-01DOI: 10.30791/0015-3214-2022-3-67-73
М. А. Kaplan, S. V. Konushkin, K. V. Sergienko, B. Kartabaeva, А. D. Gorbenko, А. G. Kolmakov, А. Y. Ivannikov, М. А. Sevostyanov
The field of application of corrosion-resistant austenitic steel is wide due to its resistance to corrosion and oxidation, durability, high strength and ductility. Austenitic corrosion-resistant steel is of particular importance for medicine. Medical instruments and products are made from it. However, the environment is very corrosive to metals and can lead to protein adsorption, biofilm formation (attachment of microorganisms/bacteria to the surface of the material), and corrosion or itself become a source of bacterial contamination. Recent studies have shown that the addition of Ag and Ti to corrosion-resistant steels can impart antibacterial properties to them without the need for surface modification. The article is devoted to the study of the structure and mechanical properties of a new antibacterial corrosion-resistant steel. The structure was studied by light optical microscopy and X-ray diffractometry. The mechanical properties were studied by stretching the samples on a tensile testing machine. The effect of homogenizing annealing and ingot rolling on the structure of corrosion-resistant steel is shown. According to the test results, it has been established that heat treatment of steel makes it possible to increase the ductility of steel. After rolling, the plates have a fine-grained structure. Normalization at 900 °C and 1000 °C relieves internal stresses and reduces the proportion of ferrite in the structure.
{"title":"Influence of heat treatment on the properties of antibacterial corrosion resistant steel","authors":"М. А. Kaplan, S. V. Konushkin, K. V. Sergienko, B. Kartabaeva, А. D. Gorbenko, А. G. Kolmakov, А. Y. Ivannikov, М. А. Sevostyanov","doi":"10.30791/0015-3214-2022-3-67-73","DOIUrl":"https://doi.org/10.30791/0015-3214-2022-3-67-73","url":null,"abstract":"The field of application of corrosion-resistant austenitic steel is wide due to its resistance to corrosion and oxidation, durability, high strength and ductility. Austenitic corrosion-resistant steel is of particular importance for medicine. Medical instruments and products are made from it. However, the environment is very corrosive to metals and can lead to protein adsorption, biofilm formation (attachment of microorganisms/bacteria to the surface of the material), and corrosion or itself become a source of bacterial contamination. Recent studies have shown that the addition of Ag and Ti to corrosion-resistant steels can impart antibacterial properties to them without the need for surface modification. The article is devoted to the study of the structure and mechanical properties of a new antibacterial corrosion-resistant steel. The structure was studied by light optical microscopy and X-ray diffractometry. The mechanical properties were studied by stretching the samples on a tensile testing machine. The effect of homogenizing annealing and ingot rolling on the structure of corrosion-resistant steel is shown. According to the test results, it has been established that heat treatment of steel makes it possible to increase the ductility of steel. After rolling, the plates have a fine-grained structure. Normalization at 900 °C and 1000 °C relieves internal stresses and reduces the proportion of ferrite in the structure.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125285517","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 : 1900-01-01DOI: 10.30791/0015-3214-2022-1-66-77
G. P. Kobylyanskij, A. Mazaev, E. A. Zvir, P. A. Il’in, P. I. Grin’, E. V. Chertopyatov, A. V. Obuhov
To prove safety of dry storage conditions, thermal tests of the VVER-1000 fuel rods were performed in electrically heated furnaces in helium gas environment under stationary conditions (they were held at Т = 380 °С for 468 days) and thermal cycling ones (48 temperature cycles in a temperature range of 20 to 380 °С) with duration of cycles varying from 1 to 10 days and the total time of thermal testing of 427 days). The effect of thermal testing on elongation of fuel rods, which were under operation in the VVER-1000 reactors for one year (burnup was ~ 20 (MW⋅days)/kgU) and for six years (burnup was ~ 70 (MW⋅days)/kgU), was studied. It was revealed that high-burnup fuel rods elongated less compared to low burnup fuel rods. The highest elongation values were obtained for the low-burnup fuel rods: it made up 6.0 mm under the stationary operating conditions and 9.5 mm under thermal cycling. Hoop strain of fuel rods increased insignificantly. As there was gas pressure under the cladding, it induced tensile stresses in it at a temperature of 380 °С and thus, stimulated thermal creep. Lower burnup fuel rods could preserve their fuel-cladding gap throughout the entire height of their fuel columns. A model of gas-filled tubular specimen with a textured cladding in which the effective axial stress is enhanced by additional tensile load due to the pressure from fuel column on the spring plunger and a greater recovery of yield strength in the longitudinal direction compared to the transverse one, is applicable to these fuel rods. For high-burnup fuel rods, this model is applicable to for that part of the cladding where it is not in contact with the fuel, i.e. for a shorter length compared to low-burnup fuel rods. Thus, the idea was proved according to which the main mechanism of fuel rod elongation is the thermal creep of the cladding induced by enhanced (due to anisotropic recovery of the yield strength) effective axial stresses resulted from the fuel gas and fuel column pressure on the spring plunger. Thermal cycling leads to greater elongation of fuel rods due to a higher creep rate of the cladding at the unsteady-state stage during short cycles.
{"title":"Factors and mechanisms of elongation of VVER-1000 fuel rods during thermal tests simulating dry storage modes","authors":"G. P. Kobylyanskij, A. Mazaev, E. A. Zvir, P. A. Il’in, P. I. Grin’, E. V. Chertopyatov, A. V. Obuhov","doi":"10.30791/0015-3214-2022-1-66-77","DOIUrl":"https://doi.org/10.30791/0015-3214-2022-1-66-77","url":null,"abstract":"To prove safety of dry storage conditions, thermal tests of the VVER-1000 fuel rods were performed in electrically heated furnaces in helium gas environment under stationary conditions (they were held at Т = 380 °С for 468 days) and thermal cycling ones (48 temperature cycles in a temperature range of 20 to 380 °С) with duration of cycles varying from 1 to 10 days and the total time of thermal testing of 427 days). The effect of thermal testing on elongation of fuel rods, which were under operation in the VVER-1000 reactors for one year (burnup was ~ 20 (MW⋅days)/kgU) and for six years (burnup was ~ 70 (MW⋅days)/kgU), was studied. It was revealed that high-burnup fuel rods elongated less compared to low burnup fuel rods. The highest elongation values were obtained for the low-burnup fuel rods: it made up 6.0 mm under the stationary operating conditions and 9.5 mm under thermal cycling. Hoop strain of fuel rods increased insignificantly. As there was gas pressure under the cladding, it induced tensile stresses in it at a temperature of 380 °С and thus, stimulated thermal creep. Lower burnup fuel rods could preserve their fuel-cladding gap throughout the entire height of their fuel columns. A model of gas-filled tubular specimen with a textured cladding in which the effective axial stress is enhanced by additional tensile load due to the pressure from fuel column on the spring plunger and a greater recovery of yield strength in the longitudinal direction compared to the transverse one, is applicable to these fuel rods. For high-burnup fuel rods, this model is applicable to for that part of the cladding where it is not in contact with the fuel, i.e. for a shorter length compared to low-burnup fuel rods. Thus, the idea was proved according to which the main mechanism of fuel rod elongation is the thermal creep of the cladding induced by enhanced (due to anisotropic recovery of the yield strength) effective axial stresses resulted from the fuel gas and fuel column pressure on the spring plunger. Thermal cycling leads to greater elongation of fuel rods due to a higher creep rate of the cladding at the unsteady-state stage during short cycles.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125233795","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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