E. Putilova, S. Zadvorkin, E. S. Gorkunov, I. Veselov, I. Pyshmintsev
The paper presents the results of the study of microstructure, mechanical and corrosion properties of the promising high-strength economically alloyed Fe-Cr-Mo steel, designed for the production of the oil country tubular goods (OCTG): casing and tubing. The main qualifying standards for this steel are to provide simultaneous increase of strength and resistance to sulfide stress cracking (SSC). It was shown that these requirements could be achieved by a special heat treatment, which results in the formation of a secondary sorbite structure with a lower dislocation density and dispersion-strengthened V, Nb carbides.The paper presents the results of the study of microstructure, mechanical and corrosion properties of the promising high-strength economically alloyed Fe-Cr-Mo steel, designed for the production of the oil country tubular goods (OCTG): casing and tubing. The main qualifying standards for this steel are to provide simultaneous increase of strength and resistance to sulfide stress cracking (SSC). It was shown that these requirements could be achieved by a special heat treatment, which results in the formation of a secondary sorbite structure with a lower dislocation density and dispersion-strengthened V, Nb carbides.
{"title":"Investigation of structure and properties of low-carbon low-alloyed Cr-Mo pipe steel intended for operating in sour environment","authors":"E. Putilova, S. Zadvorkin, E. S. Gorkunov, I. Veselov, I. Pyshmintsev","doi":"10.1063/1.5132158","DOIUrl":"https://doi.org/10.1063/1.5132158","url":null,"abstract":"The paper presents the results of the study of microstructure, mechanical and corrosion properties of the promising high-strength economically alloyed Fe-Cr-Mo steel, designed for the production of the oil country tubular goods (OCTG): casing and tubing. The main qualifying standards for this steel are to provide simultaneous increase of strength and resistance to sulfide stress cracking (SSC). It was shown that these requirements could be achieved by a special heat treatment, which results in the formation of a secondary sorbite structure with a lower dislocation density and dispersion-strengthened V, Nb carbides.The paper presents the results of the study of microstructure, mechanical and corrosion properties of the promising high-strength economically alloyed Fe-Cr-Mo steel, designed for the production of the oil country tubular goods (OCTG): casing and tubing. The main qualifying standards for this steel are to provide simultaneous increase of strength and resistance to sulfide stress cracking (SSC). It was shown that these requirements could be achieved by a special heat treatment, which results in the formation of a secondary sorbite structure with a lower dislocation density and dispersion-strengthened V, Nb carbides.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86976503","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}
Rocks of the Gabriel mine (East Kazakhstan) belong to intensively modified milonites. These rocks in the Ore Altai are often ore-bearing for metals such as zinc, lead, copper and gold. Milonites are formed by imposing deformations on the original rocks. These rocks are interesting for large studies. Using the EBSD method allows us to investigate the deformation stage of mineral formation more detailed. In this work, we studied sections of quartz porphyroblasts with different volume fractions of pyrite. As a result, we determined the influence of the pyrite volume fraction on the degree of quartz deformation and the possible presence of water in the later stages of mineral.Rocks of the Gabriel mine (East Kazakhstan) belong to intensively modified milonites. These rocks in the Ore Altai are often ore-bearing for metals such as zinc, lead, copper and gold. Milonites are formed by imposing deformations on the original rocks. These rocks are interesting for large studies. Using the EBSD method allows us to investigate the deformation stage of mineral formation more detailed. In this work, we studied sections of quartz porphyroblasts with different volume fractions of pyrite. As a result, we determined the influence of the pyrite volume fraction on the degree of quartz deformation and the possible presence of water in the later stages of mineral.
{"title":"Features of plastic deformations of quartz-pyrite mineral associations of the Gabriel mine","authors":"D. Lychagin, A. Bibko, L. Zyryanova","doi":"10.1063/1.5132069","DOIUrl":"https://doi.org/10.1063/1.5132069","url":null,"abstract":"Rocks of the Gabriel mine (East Kazakhstan) belong to intensively modified milonites. These rocks in the Ore Altai are often ore-bearing for metals such as zinc, lead, copper and gold. Milonites are formed by imposing deformations on the original rocks. These rocks are interesting for large studies. Using the EBSD method allows us to investigate the deformation stage of mineral formation more detailed. In this work, we studied sections of quartz porphyroblasts with different volume fractions of pyrite. As a result, we determined the influence of the pyrite volume fraction on the degree of quartz deformation and the possible presence of water in the later stages of mineral.Rocks of the Gabriel mine (East Kazakhstan) belong to intensively modified milonites. These rocks in the Ore Altai are often ore-bearing for metals such as zinc, lead, copper and gold. Milonites are formed by imposing deformations on the original rocks. These rocks are interesting for large studies. Using the EBSD method allows us to investigate the deformation stage of mineral formation more detailed. In this work, we studied sections of quartz porphyroblasts with different volume fractions of pyrite. As a result, we determined the influence of the pyrite volume fraction on the degree of quartz deformation and the possible presence of water in the later stages of mineral.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85493252","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 efficiency of X-ray diffraction (XRD) method for quantitative estimation of elastic modulus in materials with gradient structure have been demonstrated in the paper. This method was used to calculate the elastic modulus for NiTi samples irradiated at a beam energy E= 15 J/cm2 and pulse duration τ = 150 µsx. It is determined that the compared values of XRD elastic modulus E(hkl, ψ) and elastic modulus En obtained for the same samples by nanoindentation are close.The efficiency of X-ray diffraction (XRD) method for quantitative estimation of elastic modulus in materials with gradient structure have been demonstrated in the paper. This method was used to calculate the elastic modulus for NiTi samples irradiated at a beam energy E= 15 J/cm2 and pulse duration τ = 150 µsx. It is determined that the compared values of XRD elastic modulus E(hkl, ψ) and elastic modulus En obtained for the same samples by nanoindentation are close.
{"title":"X-ray diffraction method for quantitative estimation of elastic modulus in materials with gradient structure","authors":"M. Ostapenko, L. Meisner","doi":"10.1063/1.5132124","DOIUrl":"https://doi.org/10.1063/1.5132124","url":null,"abstract":"The efficiency of X-ray diffraction (XRD) method for quantitative estimation of elastic modulus in materials with gradient structure have been demonstrated in the paper. This method was used to calculate the elastic modulus for NiTi samples irradiated at a beam energy E= 15 J/cm2 and pulse duration τ = 150 µsx. It is determined that the compared values of XRD elastic modulus E(hkl, ψ) and elastic modulus En obtained for the same samples by nanoindentation are close.The efficiency of X-ray diffraction (XRD) method for quantitative estimation of elastic modulus in materials with gradient structure have been demonstrated in the paper. This method was used to calculate the elastic modulus for NiTi samples irradiated at a beam energy E= 15 J/cm2 and pulse duration τ = 150 µsx. It is determined that the compared values of XRD elastic modulus E(hkl, ψ) and elastic modulus En obtained for the same samples by nanoindentation are close.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88974857","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}
N. Surikova, V. Panin, N. Narkevich, A. Gordienko, M. Volochaev
The structure, mechanical characteristics and mechanisms of plastic deformation of stainless austenitic steel 12Cr15Mn9NiCu after high-temperature cross and screw and cold longitudinal rolling are examined with the help of mechanical testing, X-ray diffraction and electron transmission microscopy. It is shown that deformation martensitic transformations are the main mechanisms of deformation at temperatures less than 20 °C. The modes of thermomechanical treatment, which allow to obtain a good combination of strength and plastic properties in steel have been found out.The structure, mechanical characteristics and mechanisms of plastic deformation of stainless austenitic steel 12Cr15Mn9NiCu after high-temperature cross and screw and cold longitudinal rolling are examined with the help of mechanical testing, X-ray diffraction and electron transmission microscopy. It is shown that deformation martensitic transformations are the main mechanisms of deformation at temperatures less than 20 °C. The modes of thermomechanical treatment, which allow to obtain a good combination of strength and plastic properties in steel have been found out.
{"title":"Mechanisms of deformation of austenitic stainless steel at cold rolling","authors":"N. Surikova, V. Panin, N. Narkevich, A. Gordienko, M. Volochaev","doi":"10.1063/1.5132223","DOIUrl":"https://doi.org/10.1063/1.5132223","url":null,"abstract":"The structure, mechanical characteristics and mechanisms of plastic deformation of stainless austenitic steel 12Cr15Mn9NiCu after high-temperature cross and screw and cold longitudinal rolling are examined with the help of mechanical testing, X-ray diffraction and electron transmission microscopy. It is shown that deformation martensitic transformations are the main mechanisms of deformation at temperatures less than 20 °C. The modes of thermomechanical treatment, which allow to obtain a good combination of strength and plastic properties in steel have been found out.The structure, mechanical characteristics and mechanisms of plastic deformation of stainless austenitic steel 12Cr15Mn9NiCu after high-temperature cross and screw and cold longitudinal rolling are examined with the help of mechanical testing, X-ray diffraction and electron transmission microscopy. It is shown that deformation martensitic transformations are the main mechanisms of deformation at temperatures less than 20 °C. The modes of thermomechanical treatment, which allow to obtain a good combination of strength and plastic properties in steel have been found out.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"21 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91424762","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 paper presents the results of calculations of the elastoplastic deformation of the target using two variants of the decomposition of the total stress tensors into parts, corresponding to the volume strain and shear strain. The processes of elastoplastic deformation of a target made of a single-crystal VZhM8 alloy under shock loading by a steel projectile are simulated. The influence on the results of numerical simulation of the application of two variants of the decomposition of the total stress tensors for the target of a single-crystal alloy VZhM8, possessing auxeticity in the direction of loading, is shown.The paper presents the results of calculations of the elastoplastic deformation of the target using two variants of the decomposition of the total stress tensors into parts, corresponding to the volume strain and shear strain. The processes of elastoplastic deformation of a target made of a single-crystal VZhM8 alloy under shock loading by a steel projectile are simulated. The influence on the results of numerical simulation of the application of two variants of the decomposition of the total stress tensors for the target of a single-crystal alloy VZhM8, possessing auxeticity in the direction of loading, is shown.
{"title":"Options of decomposition of tensors of full stresses in modeling the processes of elastic-plastic deformation of auxetic media with cubic symmetry of properties","authors":"M. Krivosheina, E. Tuch, S. Kobenko","doi":"10.1063/1.5132050","DOIUrl":"https://doi.org/10.1063/1.5132050","url":null,"abstract":"The paper presents the results of calculations of the elastoplastic deformation of the target using two variants of the decomposition of the total stress tensors into parts, corresponding to the volume strain and shear strain. The processes of elastoplastic deformation of a target made of a single-crystal VZhM8 alloy under shock loading by a steel projectile are simulated. The influence on the results of numerical simulation of the application of two variants of the decomposition of the total stress tensors for the target of a single-crystal alloy VZhM8, possessing auxeticity in the direction of loading, is shown.The paper presents the results of calculations of the elastoplastic deformation of the target using two variants of the decomposition of the total stress tensors into parts, corresponding to the volume strain and shear strain. The processes of elastoplastic deformation of a target made of a single-crystal VZhM8 alloy under shock loading by a steel projectile are simulated. The influence on the results of numerical simulation of the application of two variants of the decomposition of the total stress tensors for the target of a single-crystal alloy VZhM8, possessing auxeticity in the direction of loading, is shown.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91537546","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 paper presents the results on the investigation of the accumulation of plastic strain and damage in the sample of sheet metal from lightweight structural aluminum alloy during the process of severe plastic deformation, using numerical simulation. It is proposed to use the dynamic version of the groove pressing to realize the severe plastic deformation of flat samples. A groove die with a groove of trapezoidal form is considered here. The process of dynamic groove pressing was numerically investigated in a two-dimensional formulation under plane strain condition. The maximum value of the effective plastic strain develops in the stretching area of the material and reaches a value of 0.75. In the zone of interaction between the groove of the die and the sample, the highest values of the damage parameter are achieved.The paper presents the results on the investigation of the accumulation of plastic strain and damage in the sample of sheet metal from lightweight structural aluminum alloy during the process of severe plastic deformation, using numerical simulation. It is proposed to use the dynamic version of the groove pressing to realize the severe plastic deformation of flat samples. A groove die with a groove of trapezoidal form is considered here. The process of dynamic groove pressing was numerically investigated in a two-dimensional formulation under plane strain condition. The maximum value of the effective plastic strain develops in the stretching area of the material and reaches a value of 0.75. In the zone of interaction between the groove of the die and the sample, the highest values of the damage parameter are achieved.
{"title":"Numerical simulation of intensive plastic deformation in dynamic groove pressing","authors":"L. Akhmetshin","doi":"10.1063/1.5131873","DOIUrl":"https://doi.org/10.1063/1.5131873","url":null,"abstract":"The paper presents the results on the investigation of the accumulation of plastic strain and damage in the sample of sheet metal from lightweight structural aluminum alloy during the process of severe plastic deformation, using numerical simulation. It is proposed to use the dynamic version of the groove pressing to realize the severe plastic deformation of flat samples. A groove die with a groove of trapezoidal form is considered here. The process of dynamic groove pressing was numerically investigated in a two-dimensional formulation under plane strain condition. The maximum value of the effective plastic strain develops in the stretching area of the material and reaches a value of 0.75. In the zone of interaction between the groove of the die and the sample, the highest values of the damage parameter are achieved.The paper presents the results on the investigation of the accumulation of plastic strain and damage in the sample of sheet metal from lightweight structural aluminum alloy during the process of severe plastic deformation, using numerical simulation. It is proposed to use the dynamic version of the groove pressing to realize the severe plastic deformation of flat samples. A groove die with a groove of trapezoidal form is considered here. The process of dynamic groove pressing was numerically investigated in a two-dimensional formulation under plane strain condition. The maximum value of the effective plastic strain develops in the stretching area of the material and reaches a value of 0.75. In the zone of interaction between the groove of the die and the sample, the highest values of the damage parameter are achieved.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91327046","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. Vlasov, N. Surikova, I. Mishin, S. Panin, A. Smirnova, A. Yakovlev
Effect of structure modification induced by the helical rolling on the impact toughness of 09Mn2Si steel was studied. A metallographic structural analysis of the steel in the as-received state as well as after the helical rolling (HR) was carried out. It was revealed that the five-stage combined thermal-mechanical treatment results in ferrite grains refinement, formation of rolling texture at the depth of up to 1 mm, while ultrafine grained structure is formed in the surface layer. This is accompanied by a gradient hardening pattern over the rod’s cross-section as evidenced from microhardness measurements. Mechanical properties were assessed through impact bending tests. It is shown that helical rolling gives rise to increasing fracture toughness of the rolled specimens in the entire testing temperature range (-70 ÷ +20 °C). The maximum two-fold increase of impact toughness is registered at the testing temperature of -70 °C. Authors suggest that the main reason for this increase is formation of a gradient...
{"title":"Regularities of structure modification of 09Mn2Si steel rod at helical rolling and its influence on impact toughness","authors":"I. Vlasov, N. Surikova, I. Mishin, S. Panin, A. Smirnova, A. Yakovlev","doi":"10.1063/1.5132250","DOIUrl":"https://doi.org/10.1063/1.5132250","url":null,"abstract":"Effect of structure modification induced by the helical rolling on the impact toughness of 09Mn2Si steel was studied. A metallographic structural analysis of the steel in the as-received state as well as after the helical rolling (HR) was carried out. It was revealed that the five-stage combined thermal-mechanical treatment results in ferrite grains refinement, formation of rolling texture at the depth of up to 1 mm, while ultrafine grained structure is formed in the surface layer. This is accompanied by a gradient hardening pattern over the rod’s cross-section as evidenced from microhardness measurements. Mechanical properties were assessed through impact bending tests. It is shown that helical rolling gives rise to increasing fracture toughness of the rolled specimens in the entire testing temperature range (-70 ÷ +20 °C). The maximum two-fold increase of impact toughness is registered at the testing temperature of -70 °C. Authors suggest that the main reason for this increase is formation of a gradient...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90733586","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 work studies of the alloys sintered by powder metallurgy method are presented. Samples were obtained from mixtures of powders Fe and Ni (30–40 wt % Ni) after ball-mill treatment, cold pressing and sintered in a vacuum furnace. It has been shown that the face centered cubic and body centered cubic (no more than 5%) alloys are formed at sintering of powders mixture. The lattice parameter of the γ-phase depends on content of Ni and increases from 3.585×10−10 to 3.596−10 m, these lattice parameters correspond to well-known invar alloys. The hardness of sintered samples changes from 0.8 to 1.5 GPa, the Young’s modulus changes from 83 to 126 GPa that correspond to values obtained for invar alloy in literature. The coefficient of thermal expansion is 1.1×10−6°С−1 for interval 0–150°С and is 15.8 × 10−6°С–1 for interval 300–500°С and this change corresponds to magnetic transformation at 225°С. So, alloys obtained by sintering of powders Fe and Ni are formed as invar alloy and its properties are typical of cast alloys.In this work studies of the alloys sintered by powder metallurgy method are presented. Samples were obtained from mixtures of powders Fe and Ni (30–40 wt % Ni) after ball-mill treatment, cold pressing and sintered in a vacuum furnace. It has been shown that the face centered cubic and body centered cubic (no more than 5%) alloys are formed at sintering of powders mixture. The lattice parameter of the γ-phase depends on content of Ni and increases from 3.585×10−10 to 3.596−10 m, these lattice parameters correspond to well-known invar alloys. The hardness of sintered samples changes from 0.8 to 1.5 GPa, the Young’s modulus changes from 83 to 126 GPa that correspond to values obtained for invar alloy in literature. The coefficient of thermal expansion is 1.1×10−6°С−1 for interval 0–150°С and is 15.8 × 10−6°С–1 for interval 300–500°С and this change corresponds to magnetic transformation at 225°С. So, alloys obtained by sintering of powders Fe and Ni are formed as invar alloy and its properties are typical of...
{"title":"Studies of invar alloys sintered from powders mixtures","authors":"E. Abdulmenova, V. Kashirina, S. Kulkov","doi":"10.1063/1.5131869","DOIUrl":"https://doi.org/10.1063/1.5131869","url":null,"abstract":"In this work studies of the alloys sintered by powder metallurgy method are presented. Samples were obtained from mixtures of powders Fe and Ni (30–40 wt % Ni) after ball-mill treatment, cold pressing and sintered in a vacuum furnace. It has been shown that the face centered cubic and body centered cubic (no more than 5%) alloys are formed at sintering of powders mixture. The lattice parameter of the γ-phase depends on content of Ni and increases from 3.585×10−10 to 3.596−10 m, these lattice parameters correspond to well-known invar alloys. The hardness of sintered samples changes from 0.8 to 1.5 GPa, the Young’s modulus changes from 83 to 126 GPa that correspond to values obtained for invar alloy in literature. The coefficient of thermal expansion is 1.1×10−6°С−1 for interval 0–150°С and is 15.8 × 10−6°С–1 for interval 300–500°С and this change corresponds to magnetic transformation at 225°С. So, alloys obtained by sintering of powders Fe and Ni are formed as invar alloy and its properties are typical of cast alloys.In this work studies of the alloys sintered by powder metallurgy method are presented. Samples were obtained from mixtures of powders Fe and Ni (30–40 wt % Ni) after ball-mill treatment, cold pressing and sintered in a vacuum furnace. It has been shown that the face centered cubic and body centered cubic (no more than 5%) alloys are formed at sintering of powders mixture. The lattice parameter of the γ-phase depends on content of Ni and increases from 3.585×10−10 to 3.596−10 m, these lattice parameters correspond to well-known invar alloys. The hardness of sintered samples changes from 0.8 to 1.5 GPa, the Young’s modulus changes from 83 to 126 GPa that correspond to values obtained for invar alloy in literature. The coefficient of thermal expansion is 1.1×10−6°С−1 for interval 0–150°С and is 15.8 × 10−6°С–1 for interval 300–500°С and this change corresponds to magnetic transformation at 225°С. So, alloys obtained by sintering of powders Fe and Ni are formed as invar alloy and its properties are typical of...","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":"90879919","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 regularities of defect formation in polymetallic materials of various systems obtained by the method of electron-beam additive technology with the process parameters variation from the optimal values are investigated. It is revealed that depending on the material selected for the metal and alloy samples formation there is nucleation of defects which differ in structure and influence on mechanical properties. In the samples from the pair of metals with high solubility in the solid state and the ability to form intermetallic compounds, determined by the state diagram, the defects are formed in the form of cracks and stratifications. Samples of all systems can form heterogeneous distribution of the system components due to irregularity of wire filament feeding, filament underheating or substrate overheating.
{"title":"Regularities of defect formation at additive electron-beam manufacturing of polymetallic samples","authors":"A. Gusarova, E. Khoroshko","doi":"10.1063/1.5132004","DOIUrl":"https://doi.org/10.1063/1.5132004","url":null,"abstract":"The regularities of defect formation in polymetallic materials of various systems obtained by the method of electron-beam additive technology with the process parameters variation from the optimal values are investigated. It is revealed that depending on the material selected for the metal and alloy samples formation there is nucleation of defects which differ in structure and influence on mechanical properties. In the samples from the pair of metals with high solubility in the solid state and the ability to form intermetallic compounds, determined by the state diagram, the defects are formed in the form of cracks and stratifications. Samples of all systems can form heterogeneous distribution of the system components due to irregularity of wire filament feeding, filament underheating or substrate overheating.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88592862","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 effect of heat treatment on the microstructure and mechanical properties of Febal-0.1 wt.%C-12Cr-3Co-2.5W-1Cu-VNbTaBN steel was investigated. After normalization in the range of 1050-1150°C, the martensitic structure was dominant; δ-ferrite content was about 10%. When the temperature of normalizing increased from 1050°C to 1150°C, the average size of prior austenite grains increased from 44 to 68 µm. After tempering at 750, 770 and 800°C, tempered martensitic lath structure with a high dislocation density within martensitic laths contained nanosized M23C6 carbides along the boundaries of prior austenite grains and laths and (Ta,Nb)X carbonitrides randomly distributed in the ferritic matrix. The average sizes of M23C6 carbides and (Ta,Nb)X carbonitrides were about 50 nm and 40 nm, respectively, regardless of tempering temperature. The M6C carbide particles were also observed along the boundaries of prior austenite grains and pockets as well as along the boundaries between δ-ferrite and martensite; their amount was negligible. When tempering temperature increased from 750 to 800°C, the particle density on the boundaries between δ- ferrite/martensite decreased from 3.8 to 0.2 µm-1. A relationship between the lath size (h) and the density of free dislocations (ρ) can be described as h = (5.41/√ρ) - 0.07. Increasing the tempering temperature to 800°C led to a decrease in the hardness up to ∼220 HB, yield stress and ultimate tensile stress up to 520 and 700 MPa, respectively.The effect of heat treatment on the microstructure and mechanical properties of Febal-0.1 wt.%C-12Cr-3Co-2.5W-1Cu-VNbTaBN steel was investigated. After normalization in the range of 1050-1150°C, the martensitic structure was dominant; δ-ferrite content was about 10%. When the temperature of normalizing increased from 1050°C to 1150°C, the average size of prior austenite grains increased from 44 to 68 µm. After tempering at 750, 770 and 800°C, tempered martensitic lath structure with a high dislocation density within martensitic laths contained nanosized M23C6 carbides along the boundaries of prior austenite grains and laths and (Ta,Nb)X carbonitrides randomly distributed in the ferritic matrix. The average sizes of M23C6 carbides and (Ta,Nb)X carbonitrides were about 50 nm and 40 nm, respectively, regardless of tempering temperature. The M6C carbide particles were also observed along the boundaries of prior austenite grains and pockets as well as along the boundaries between δ-ferrite and martensite; thei...
{"title":"Effect of heat treatment on structure and mechanical properties of 12Cr-3Co steel with low N and high B contents","authors":"I. Nikitin, A. Fedoseeva, N. Dudova, R. Kaibyshev","doi":"10.1063/1.5132109","DOIUrl":"https://doi.org/10.1063/1.5132109","url":null,"abstract":"The effect of heat treatment on the microstructure and mechanical properties of Febal-0.1 wt.%C-12Cr-3Co-2.5W-1Cu-VNbTaBN steel was investigated. After normalization in the range of 1050-1150°C, the martensitic structure was dominant; δ-ferrite content was about 10%. When the temperature of normalizing increased from 1050°C to 1150°C, the average size of prior austenite grains increased from 44 to 68 µm. After tempering at 750, 770 and 800°C, tempered martensitic lath structure with a high dislocation density within martensitic laths contained nanosized M23C6 carbides along the boundaries of prior austenite grains and laths and (Ta,Nb)X carbonitrides randomly distributed in the ferritic matrix. The average sizes of M23C6 carbides and (Ta,Nb)X carbonitrides were about 50 nm and 40 nm, respectively, regardless of tempering temperature. The M6C carbide particles were also observed along the boundaries of prior austenite grains and pockets as well as along the boundaries between δ-ferrite and martensite; their amount was negligible. When tempering temperature increased from 750 to 800°C, the particle density on the boundaries between δ- ferrite/martensite decreased from 3.8 to 0.2 µm-1. A relationship between the lath size (h) and the density of free dislocations (ρ) can be described as h = (5.41/√ρ) - 0.07. Increasing the tempering temperature to 800°C led to a decrease in the hardness up to ∼220 HB, yield stress and ultimate tensile stress up to 520 and 700 MPa, respectively.The effect of heat treatment on the microstructure and mechanical properties of Febal-0.1 wt.%C-12Cr-3Co-2.5W-1Cu-VNbTaBN steel was investigated. After normalization in the range of 1050-1150°C, the martensitic structure was dominant; δ-ferrite content was about 10%. When the temperature of normalizing increased from 1050°C to 1150°C, the average size of prior austenite grains increased from 44 to 68 µm. After tempering at 750, 770 and 800°C, tempered martensitic lath structure with a high dislocation density within martensitic laths contained nanosized M23C6 carbides along the boundaries of prior austenite grains and laths and (Ta,Nb)X carbonitrides randomly distributed in the ferritic matrix. The average sizes of M23C6 carbides and (Ta,Nb)X carbonitrides were about 50 nm and 40 nm, respectively, regardless of tempering temperature. The M6C carbide particles were also observed along the boundaries of prior austenite grains and pockets as well as along the boundaries between δ-ferrite and martensite; thei...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89248063","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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