The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
A. I. Zaitsev - One of the best experts on this subject based on the ideXlab platform.
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Effect of Hot Rolling Regimes on Solid Solution Structure, State and Properties of Titanium-Stabilized if-Steel Hot-Rolled and Cold-Rolled Product
Metallurgist, 2020Co-Authors: A. I. Zaitsev, A. V. Koldaev, I. G. Rodionova, N. A. ArutyunyanAbstract:Using contemporary physicochemical approaches for predicting phase precipitate stability conditions for laboratory melted metal by optical, scanning, and transmission electron microscopy, local X-ray spectral analysis, testing mechanical characteristics, and determining the content of interstitial elements in solid metal a detailed study is made of the structural state and properties of titanium stabilized IF steels of three compositions. Based on the results obtained, the main requirements for hot-Rolled steels are formulated, and the principles and conditions for obtaining good ductility and formability indices are determined for cold-Rolled Product subjected to recrystallization annealing by a continuous hot-dip galvanizing unit (HDGU) regime.
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Effect of Temperature-Deformation Treatment Regime for Special Alloy Steels on Rolled Product Structural State and Properties
Metallurgist, 2018Co-Authors: A. V. Koldaev, A. V. Amezhnov, A. I. Zaitsev, A. B. StepanovAbstract:The effect of cooling regime after rolling and also subsequent spheroidizing annealing are studied for Rolled Product of special alloy steel 40Kh of an industrial melt on metal structural state and amount of relative reduction of area. It is established that the amount of reduction of area, varying uniformly round Rolled Product capacity for cold upsetting, increases with a reduction in the proportion of ferrite and an increase in steel ferrite-pearlite structure uniformity and fineness. The most favorable microstructure and high value for reduction of area occur after spheroidizing annealing of Rolled Product with a bainitic structure.
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Effect of Composition and Heat Treatment Regime on Structural State and Capacity of Special Alloy Steel Round Rolled Product for Cold Upsetting
Metallurgist, 2017Co-Authors: A. I. Zaitsev, A. V. Koldaev, A. B. StepanovAbstract:On the basis of physicochemical prediction of the effect of component content on the phase and structural transformations, it is shown that in order to prepare a favourable ferrite-pearlite microstructure and to ensure the key capacity of round Rolled Product for cold upsetting, it is preferable to obtain in special alloy steels 40Х, 38KhGNM, 35KhGSA, 30G1R, and 12KhN an element content close to the lower grade limit. A study of the microstructure and hardness of round-Rolled specimens from steels 35KhGSA, 38KhGNM, and 40Х establishes that isothermal annealing at 20–50°C below the А1 temperature and nonisothermal annealing at 1–30°C below the А1 temperature are the optimum for spheroidizing heat treatment. In this case, a different fraction of globular pearlite is obtained in the metal microstructure depending on the steel grade: 35KhGSA about 90%, 38KhGNM and 40Х about 30%, and in all cases there are favorable results for cold upsetting tests. The defining effect of surface defects and Rolled Product structural state on cold upsetting capacity is demonstrated.
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effect of nonmetallic inclusions and impurities on the properties and quality characteristics of round Rolled Product made of special alloyed steels
Metallurgist, 2017Co-Authors: A. I. Zaitsev, A. V. Koldaev, A. V. Amezhnov, A V Knyazev, A. B. StepanovAbstract:It is found from results of studying Rolled steel from special alloyed steels of industrial grades 30G1R, 40Kh and laboratory grades 12KhN, 38KhGNM, 41Kh1 that a change in the ratio of Mn:S concentration in the range of 21–620, P content from 0.004 to 0.022 wt.%, non-metallic inclusions up to point 2.5 according to GOST 1778, N up to 0.010%, H up to 0.0005%, with total pressure created by gas-forming elements up to 1.05 atm, are not critical for occurrence of defects and rolling capacity for cold upsetting. Determination of the characteristics of NI, and CANI content in steel 40Kh round Rolled Product shows that metal corrosion resistance increases by more than a factor of three with a reduction in CANI2 content and inclusions of the system CaO–Al2O3–MgO containing up to 5 wt.% SiO2, and the insignificant effect of other types of inclusions. A study of the metal of high-strength fasteners manufactured by JH (Taiwan), OF, AL (USA) shows that it has a significantly lower content of other types (corundum, calcium, aluminate, sulphide) of inclusions, and conversely better corrosion resistance.
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conditions for complex precipitate formation and their effect on low carbon steel cold Rolled Product properties
Metallurgist, 2017Co-Authors: Yu S Gladchenkova, A. V. Koldaev, N G Shaposhnikov, I. G. Rodionova, D L Dyakonov, A. I. ZaitsevAbstract:The effect of chemical composition and recrystallization annealing regimes in continuously operating units on the mechanical properties of cold-Rolled Product of type 08Yu steels is studied. It is established that with a sulfur content of 0.012–0.018% during hot rolling an optimum amount and size distribution of manganese sulfide particles is achieved providing the formation on them of cementite and aluminum nitride precipitates. Complex MnS-cementite particles formed in an equalization chamber of a continuously operating hot galvanizing unit facilitate an increase in formability as a result of a reduction in the degree of the difference in grain size of the microstructure and an increase in cementite distribution uniformity. Precipitation of AlN on MnS particles in the course of metal hot rolling and cooling provides more complete removal of nitrogen from solid solution, and consequently a reduction in steel tendency towards strain ageing. A significant reduction in the proportion of fine AlN particles increases the rate of cold worked metal recrystallization, and this leads to a reduction in fineness of the microstructure and a corresponding reduction in yield strength and an increase in relative elongation.
I. G. Rodionova - One of the best experts on this subject based on the ideXlab platform.
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Effect of Hot Rolling Regimes on Solid Solution Structure, State and Properties of Titanium-Stabilized if-Steel Hot-Rolled and Cold-Rolled Product
Metallurgist, 2020Co-Authors: A. I. Zaitsev, A. V. Koldaev, I. G. Rodionova, N. A. ArutyunyanAbstract:Using contemporary physicochemical approaches for predicting phase precipitate stability conditions for laboratory melted metal by optical, scanning, and transmission electron microscopy, local X-ray spectral analysis, testing mechanical characteristics, and determining the content of interstitial elements in solid metal a detailed study is made of the structural state and properties of titanium stabilized IF steels of three compositions. Based on the results obtained, the main requirements for hot-Rolled steels are formulated, and the principles and conditions for obtaining good ductility and formability indices are determined for cold-Rolled Product subjected to recrystallization annealing by a continuous hot-dip galvanizing unit (HDGU) regime.
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Study of the Effect of Microstructure Characteristics on Corrosion Resistance of Cold-Rolled Micro-Alloyed Sheet Steels (Hsla) of Strength Classes 340–420 for Automobile Building
Metallurgist, 2020Co-Authors: I. G. Rodionova, A. V. Amezhnov, N G Shaposhnikov, D. L. D’yakonov, O. N. Baklanova, Yu S GladchenkovaAbstract:The effect of microstructure characteristics and also Production regimes on corrosion resistance of cold Rolled high-strength low-alloy steels (HSLA) grades 340 and 420 is studied. It is shown that the corrosion resistance of cold Rolled HSLA steels of strength class 340 (НС340LA) is determined both by aging processes, developing in overageing sections of continuous annealing units (CAU), and also formationm of a considerable amount of nanosize niobium carbonitride precipitates. For Rolled Product of strength class 420 (НС420LA) with a higher manganese and niobium content after annealing in a CAU average values of corrosion rate are slower than for Rolled steel of lower strength classes. Probably, for this steel the aging process does not significantly affect the corrosion resistance. At the same time, an increase inannealing temperature to 750–762°C leads to an increase in corrosion resistance due to the coagulation of nanosize niobium carbonitride precipitates and a reduction in their amount (≈ 1500 to 600 precipitates/ μm^2 or less).
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conditions for complex precipitate formation and their effect on low carbon steel cold Rolled Product properties
Metallurgist, 2017Co-Authors: Yu S Gladchenkova, A. V. Koldaev, N G Shaposhnikov, I. G. Rodionova, D L Dyakonov, A. I. ZaitsevAbstract:The effect of chemical composition and recrystallization annealing regimes in continuously operating units on the mechanical properties of cold-Rolled Product of type 08Yu steels is studied. It is established that with a sulfur content of 0.012–0.018% during hot rolling an optimum amount and size distribution of manganese sulfide particles is achieved providing the formation on them of cementite and aluminum nitride precipitates. Complex MnS-cementite particles formed in an equalization chamber of a continuously operating hot galvanizing unit facilitate an increase in formability as a result of a reduction in the degree of the difference in grain size of the microstructure and an increase in cementite distribution uniformity. Precipitation of AlN on MnS particles in the course of metal hot rolling and cooling provides more complete removal of nitrogen from solid solution, and consequently a reduction in steel tendency towards strain ageing. A significant reduction in the proportion of fine AlN particles increases the rate of cold worked metal recrystallization, and this leads to a reduction in fineness of the microstructure and a corresponding reduction in yield strength and an increase in relative elongation.
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Effect of Alloying with Aluminum and Deformation-Heat Treatment on Rolled Product Crystal Structure
Metallurgist, 2016Co-Authors: I. G. Rodionova, A. I. Kovalev, K. A. Udod, S. V. Stukalin, O. N. Baklanova, D. L.wainsteinAbstract:Ferritic steels with high aluminum content are studied experimentally. A feature of the hot-Rolled condition of steels alloyed with more than 5% aluminum is formation of fine dislocation cellular substructure. It is shown that with an increase in aluminum content and decrease in final rolling temperature the cellular substructure becomes more pronounced, which leads to an improvement of Rolled Product strength properties.
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Effect of New Types of Nonmetallic Inclusions on Continuously-Cast Billets and the Quality of High-Strength Low-Alloy Steel Rolled Product
Metallurgist, 2016Co-Authors: I. G. Rodionova, A. I. Zaitsev, A. I. Kovalev, D. L. Vainshtein, I. V. Lyasotskii, D. L. D’yakonov, K. A. Udod, M. V. RodionovaAbstract:The nature of new types of nonmetallic inclusions (NI) facilitating improvement of a continuously-cast billet (CCB) and Rolled Product of high-strength low-alloy steels is studied. Contemporary approaches are considered for improving hot-Rolled Product. It is noted that apart from chemical composition and hot rolling regimes its properties are affected by CCB quality and the degree of different liquation processes. Results are analyzed for previous studies pointing to the fact that liquation inhomogeneity is suppressed in the case when in the concluding stage of steel treatment in a ladle and/or during crystallization there is formation of oxide NI of complex composition, presumably glassy. NI composition, and macro- and microstructure of CCB whose Rolled Product has a different level of mechanical properties and an axial zone with a different degree of structural inhomogeneity, are studied. It is shown that Rolled Product with a high level of properties and uniform structure of the axial zone is obtained from a CCB within whose structure there are compound NI of complex composition containing oxides of silicon, iron, and other elements, and also dendrite-like precipitates of carbonitrides (carbides).
Yeong-maw Hwang - One of the best experts on this subject based on the ideXlab platform.
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analytical and experimental study on the spiral marks of the Rolled Product during three roll planetary rolling processes
International Journal of Machine Tools & Manufacture, 2006Co-Authors: Yeong-maw Hwang, W M Tsai, F H TsaiAbstract:In this study, the effects of various rolling conditions, such as inclined angle, offset angle, roll shapes, etc., upon the depth of the spiral marks on the surface of the Rolled Product and the rolling forces are discussed numerically by the finite element method. Experiments using a self-designed testing machine with work-rolls of three different kinds of roll shapes were conducted. The depth of the spiral marks was measured. From the comparisons between the analytical and experimental results, it is known that a smoother surface on the Rolled Product can always be obtained with convex-shaped rolls. Whereas, prominent spiral marks probably appear for two-stage conical rolls and spherical-headed rolls under an ill-set rolling condition. These analytical and experimental results can offer useful knowledge for the design of the roll shapes and the pass schedule during three-roll planetary rolling processes.
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Analysis of the shape rolling of a V-sectioned sheet by the dual-stream function method
Journal of Materials Processing Technology, 1999Co-Authors: Yeong-maw Hwang, J R ChenAbstract:Abstract A mathematical model using dual-stream functions and the upper bound theorem has been proposed in this work to examine the plastic deformation behavior of the sheet at the roll gap during shape rolling of a V-sectioned sheet. This analytical model is also employed to systematically examine the rolling force and the geometry of the Rolled Product, which are both affected by various rolling conditions such as the sizes of the raw sheet, the inclination of the roll profile, the thickness reduction, etc. Furthermore, experiments on the cold shape rolling of aluminum sheet have also been conducted. The rolling forces and the shape of the Rolled Product were measured to compare with the analytical values. Through the comparisons made between them, the validity of this newly proposed approach was verified.
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A General Velocity Field for Shape Rolling of a V-Sectioned Sheet
Journal of Manufacturing Science and Engineering-transactions of The Asme, 1999Co-Authors: Yeong-maw Hwang, Hung-jiun Lin, J R ChenAbstract:A general kinematically admissible velocity field has been proposed in this work to examine the plastic deformation behavior of the sheet at the roll gap during shape rolling of a V-sectioned sheet. This velocity field is employed to examine the geometry of the Rolled Product, which are effected by various rolling conditions such as the sizes of the raw sheet and the vacancy, thickness reduction, etc. Furthermore, experiments on cold shape rolling of aluminum sheet have also been conducted. The rolling forces and the shape of the Rolled Product were measured to compare with the analytical values. Through the comparisons between them, the validity of this newly proposed velocity field was verified.
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analysis of asymmetrical clad sheet rolling by stream function method
International Journal of Mechanical Sciences, 1996Co-Authors: Yeong-maw Hwang, Ternghuei ChenAbstract:A mathematical model for asymmetrical clad sheet rolling is proposed by using the stream function method and the upper bound theorem to investigate the plastic deformation behaviour of sheets at the roll-gap. The curvature and thickness ratio of the Rolled Product and rolling power, effected by various rolling conditions such as roll speed ratio, roll radius ratio, initial thickness ratio and flow stress ratio of sheets, total thickness reduction, etc., are systematically discussed. Furthermore, experiments on asymmetrical clad sheet rolling are also conducted by employing aluminum, copper, and mild steel as layers of clad sheets. It is found that the theoretical predictions of the thickness ratio of the Rolled Products, rolling force, and rolling power are in good agreement with the experimental measurements. Through the study, it becomes clear that the proposed analytical method is applicable to simulate the asymmetrical clad sheet rolling processes and is able to offer useful knowledge in manufacturing clad sheets.
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analysis of sandwich sheet rolling by stream function method
International Journal of Mechanical Sciences, 1995Co-Authors: Yeong-maw HwangAbstract:Abstract A mathematical model for symmetrical sandwich sheet rolling is proposed by using the stream function method and the upper bound theorem to investigate the plastic deformation behavior of sheets at the roll-gap. The velocity fields derived from the newly proposed stream functions can automatically satisfy the volume constancy and the velocity boundary conditions within the roll-gap. Effects of various rolling conditions such as the thickness ratio and flow stress ratio of sheets, total thickness reduction, friction factor between the sheet and roll, etc., upon the thickness ratio of the Rolled Product, the relative length of the plastic region in each layer, rolling force and rolling power are discussed systematically. Furthermore, experiments on sandwich sheet rolling are also conducted by employing aluminium, mild steel and stainless steel as layers of sandwich sheets. It is found that the theoretical predictions of the thickness ratio of the Rolled Products and rolling force are in good agreement with the experimental measurements. Through the study, it becomes clear that the proposed analytical method is applicable for simulating the sandwich sheet rolling processes and is able to offer useful knowledge in manufacturing sandwich sheets.
A. V. Koldaev - One of the best experts on this subject based on the ideXlab platform.
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Effect of Hot Rolling Regimes on Solid Solution Structure, State and Properties of Titanium-Stabilized if-Steel Hot-Rolled and Cold-Rolled Product
Metallurgist, 2020Co-Authors: A. I. Zaitsev, A. V. Koldaev, I. G. Rodionova, N. A. ArutyunyanAbstract:Using contemporary physicochemical approaches for predicting phase precipitate stability conditions for laboratory melted metal by optical, scanning, and transmission electron microscopy, local X-ray spectral analysis, testing mechanical characteristics, and determining the content of interstitial elements in solid metal a detailed study is made of the structural state and properties of titanium stabilized IF steels of three compositions. Based on the results obtained, the main requirements for hot-Rolled steels are formulated, and the principles and conditions for obtaining good ductility and formability indices are determined for cold-Rolled Product subjected to recrystallization annealing by a continuous hot-dip galvanizing unit (HDGU) regime.
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Effect of Temperature-Deformation Treatment Regime for Special Alloy Steels on Rolled Product Structural State and Properties
Metallurgist, 2018Co-Authors: A. V. Koldaev, A. V. Amezhnov, A. I. Zaitsev, A. B. StepanovAbstract:The effect of cooling regime after rolling and also subsequent spheroidizing annealing are studied for Rolled Product of special alloy steel 40Kh of an industrial melt on metal structural state and amount of relative reduction of area. It is established that the amount of reduction of area, varying uniformly round Rolled Product capacity for cold upsetting, increases with a reduction in the proportion of ferrite and an increase in steel ferrite-pearlite structure uniformity and fineness. The most favorable microstructure and high value for reduction of area occur after spheroidizing annealing of Rolled Product with a bainitic structure.
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Effect of Composition and Heat Treatment Regime on Structural State and Capacity of Special Alloy Steel Round Rolled Product for Cold Upsetting
Metallurgist, 2017Co-Authors: A. I. Zaitsev, A. V. Koldaev, A. B. StepanovAbstract:On the basis of physicochemical prediction of the effect of component content on the phase and structural transformations, it is shown that in order to prepare a favourable ferrite-pearlite microstructure and to ensure the key capacity of round Rolled Product for cold upsetting, it is preferable to obtain in special alloy steels 40Х, 38KhGNM, 35KhGSA, 30G1R, and 12KhN an element content close to the lower grade limit. A study of the microstructure and hardness of round-Rolled specimens from steels 35KhGSA, 38KhGNM, and 40Х establishes that isothermal annealing at 20–50°C below the А1 temperature and nonisothermal annealing at 1–30°C below the А1 temperature are the optimum for spheroidizing heat treatment. In this case, a different fraction of globular pearlite is obtained in the metal microstructure depending on the steel grade: 35KhGSA about 90%, 38KhGNM and 40Х about 30%, and in all cases there are favorable results for cold upsetting tests. The defining effect of surface defects and Rolled Product structural state on cold upsetting capacity is demonstrated.
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effect of nonmetallic inclusions and impurities on the properties and quality characteristics of round Rolled Product made of special alloyed steels
Metallurgist, 2017Co-Authors: A. I. Zaitsev, A. V. Koldaev, A. V. Amezhnov, A V Knyazev, A. B. StepanovAbstract:It is found from results of studying Rolled steel from special alloyed steels of industrial grades 30G1R, 40Kh and laboratory grades 12KhN, 38KhGNM, 41Kh1 that a change in the ratio of Mn:S concentration in the range of 21–620, P content from 0.004 to 0.022 wt.%, non-metallic inclusions up to point 2.5 according to GOST 1778, N up to 0.010%, H up to 0.0005%, with total pressure created by gas-forming elements up to 1.05 atm, are not critical for occurrence of defects and rolling capacity for cold upsetting. Determination of the characteristics of NI, and CANI content in steel 40Kh round Rolled Product shows that metal corrosion resistance increases by more than a factor of three with a reduction in CANI2 content and inclusions of the system CaO–Al2O3–MgO containing up to 5 wt.% SiO2, and the insignificant effect of other types of inclusions. A study of the metal of high-strength fasteners manufactured by JH (Taiwan), OF, AL (USA) shows that it has a significantly lower content of other types (corundum, calcium, aluminate, sulphide) of inclusions, and conversely better corrosion resistance.
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conditions for complex precipitate formation and their effect on low carbon steel cold Rolled Product properties
Metallurgist, 2017Co-Authors: Yu S Gladchenkova, A. V. Koldaev, N G Shaposhnikov, I. G. Rodionova, D L Dyakonov, A. I. ZaitsevAbstract:The effect of chemical composition and recrystallization annealing regimes in continuously operating units on the mechanical properties of cold-Rolled Product of type 08Yu steels is studied. It is established that with a sulfur content of 0.012–0.018% during hot rolling an optimum amount and size distribution of manganese sulfide particles is achieved providing the formation on them of cementite and aluminum nitride precipitates. Complex MnS-cementite particles formed in an equalization chamber of a continuously operating hot galvanizing unit facilitate an increase in formability as a result of a reduction in the degree of the difference in grain size of the microstructure and an increase in cementite distribution uniformity. Precipitation of AlN on MnS particles in the course of metal hot rolling and cooling provides more complete removal of nitrogen from solid solution, and consequently a reduction in steel tendency towards strain ageing. A significant reduction in the proportion of fine AlN particles increases the rate of cold worked metal recrystallization, and this leads to a reduction in fineness of the microstructure and a corresponding reduction in yield strength and an increase in relative elongation.
N G Shaposhnikov - One of the best experts on this subject based on the ideXlab platform.
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Study of the Effect of Microstructure Characteristics on Corrosion Resistance of Cold-Rolled Micro-Alloyed Sheet Steels (Hsla) of Strength Classes 340–420 for Automobile Building
Metallurgist, 2020Co-Authors: I. G. Rodionova, A. V. Amezhnov, N G Shaposhnikov, D. L. D’yakonov, O. N. Baklanova, Yu S GladchenkovaAbstract:The effect of microstructure characteristics and also Production regimes on corrosion resistance of cold Rolled high-strength low-alloy steels (HSLA) grades 340 and 420 is studied. It is shown that the corrosion resistance of cold Rolled HSLA steels of strength class 340 (НС340LA) is determined both by aging processes, developing in overageing sections of continuous annealing units (CAU), and also formationm of a considerable amount of nanosize niobium carbonitride precipitates. For Rolled Product of strength class 420 (НС420LA) with a higher manganese and niobium content after annealing in a CAU average values of corrosion rate are slower than for Rolled steel of lower strength classes. Probably, for this steel the aging process does not significantly affect the corrosion resistance. At the same time, an increase inannealing temperature to 750–762°C leads to an increase in corrosion resistance due to the coagulation of nanosize niobium carbonitride precipitates and a reduction in their amount (≈ 1500 to 600 precipitates/ μm^2 or less).
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conditions for complex precipitate formation and their effect on low carbon steel cold Rolled Product properties
Metallurgist, 2017Co-Authors: Yu S Gladchenkova, A. V. Koldaev, N G Shaposhnikov, I. G. Rodionova, D L Dyakonov, A. I. ZaitsevAbstract:The effect of chemical composition and recrystallization annealing regimes in continuously operating units on the mechanical properties of cold-Rolled Product of type 08Yu steels is studied. It is established that with a sulfur content of 0.012–0.018% during hot rolling an optimum amount and size distribution of manganese sulfide particles is achieved providing the formation on them of cementite and aluminum nitride precipitates. Complex MnS-cementite particles formed in an equalization chamber of a continuously operating hot galvanizing unit facilitate an increase in formability as a result of a reduction in the degree of the difference in grain size of the microstructure and an increase in cementite distribution uniformity. Precipitation of AlN on MnS particles in the course of metal hot rolling and cooling provides more complete removal of nitrogen from solid solution, and consequently a reduction in steel tendency towards strain ageing. A significant reduction in the proportion of fine AlN particles increases the rate of cold worked metal recrystallization, and this leads to a reduction in fineness of the microstructure and a corresponding reduction in yield strength and an increase in relative elongation.
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structural state evolution and Rolled Product properties in relation to treatment regime of model steels for hot stamping 1 hot Rolled Product
Metallurgist, 2016Co-Authors: A. I. Zaitsev, A. V. Koldaev, Yu S Gladchenkova, N G Shaposhnikov, S F DunaevAbstract:A model steel microalloyed with vanadium is studied in detail for features of the change in microstructure, mechanical properties, and nanosize carbonitride precipitation system in relation to hot rolling, recrystallization annealing, and primarily slow cooling. The possibility is established of the occurrence during Rolled Product slow cooling of processes similar to recrystallization, leading to a reduction in grain elongation and size, stress relaxation, and formation of a more uniform and equilibrium condition. In addition, due to the formation a considerable amount of vanadium carbonitride precipitates with an average size of 10–15 nm dispersion hardening is realized that provides an increase in strength almost without a reduction in ductility. The intensity of development of the favorable processes described depends to a certain extent on condition of the solid solution formed during steel hot rolling. In addition, an increase in temperature at the end of hot rolling to 830–845°C with a reduction in strip winding temperature in a coil to about 600°C and below leads to improvement of the structural state, and the set of annealed cold-Rolled Product mechanical properties.
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Prevention of Corrosion-Resistant Austenitic Steel Cladding Layer Surface Defects
Metallurgist, 2016Co-Authors: A. V. Amezhnov, A. I. Zaitsev, N G Shaposhnikov, I. G. Rodionova, A A Pavlov, O. N. BaklanovaAbstract:Reasons are studied for surface defect formation (rolling crystallization cracks) for a bimetallic Rolled Product cladding layer of austenitic class corrosion-resistant steel prepared by electroslag welding. An unfavorable effect of liquation during welded layer steel crystallization is established for surface quality. Possibilities and examples are established for preventing the occurrence of surface defects by optimizing welded steel chemical composition, and also bimetallic Rolled Product start-to-finish manufacturing technology parameters.
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effect of composition structural state and manufacturing technology on service properties of high strength low carbon steel main bimetal layer
Metallurgist, 2015Co-Authors: A. I. Zaitsev, N G Shaposhnikov, I. G. Rodionova, A A Pavlov, A V GrishinAbstract:The effect of composition, structural state, excess phase precipitation, and manufacturing technology parameters on service property indices of high-strength, low-carbon steel of a main bimetal layer is studied in detail. For the low-carbon, high-strength steels developed primary importance is attached to strengthening mechanisms, connected with formation of different size carbonitride precipitates with different fineness, and secondary importance applies to the presence of strong structural components. A simultaneous improvement in strength properties and preparation of good steel weldability may be achieved by some increase in carbon content using a balanced microalloying system with a reduction in concentration of manganese, chromium, nickel, and copper, and effective alloying with boron. It is shown that the possibility of achieving high strength properties for the low-carbon steel developed with relatively slow cooling rates creates favorable conditions for obtaining a clad Rolled Product with a good and stable set of mechanical and other service properties, and quality indices.
