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Dive into the research topics where V. G. Kuleev is active.

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Featured researches published by V. G. Kuleev.


Physics of Metals and Metallography | 2007

On the origin of essential differences in the coercive force, remanence, and initial permeability of ferromagnetic steels in the loaded and unloaded states upon plastic tension

V. G. Kuleev; T. P. Tsar’kova; A. P. Nichipuruk; V. I. Voronin; I. F. Berger

The behavior of remanence Mr, initial permeability μ, and coercive force Hc of the steels during their plastic tension in both loaded and unloaded states upon “slow” and “rapid” loading is explained from a unified point of view. It is shown that (1) a sharp (severalfold) decrease in Mr and μ and a similar abrupt increase in Hc are caused by the same effect, namely the appearance of high residual compressive stresses in most grains along the force direction; (2) in the loaded state, Mr and μ slowly decrease and Hc similarly slowly increases with increasing degree of deformation ε due to a common effect of increasing dislocation density ρ with increasing ε; (3) the values of Mr, μ, and Hc in the transition region, in which ε ≤ εcr, substantially differ from each other upon “slow” and “rapid” loadings; (4) at ε ≥ εcr, the dependences of the Mr, μ, and Hc parameters on ε both in the loaded and unloaded states are parallel to each other.


Russian Journal of Nondestructive Testing | 2006

Effect of tensile plastic deformations on the residual magnetization and initial permeability of low-carbon steels

V. G. Kuleev; T. P. Tsar’kova; A. P. Nichipuruk

The behavior of residual magnetization Mr, initial magnetic permeability μ, and coercive force Hc of steels subjected to plastic extension both in the loaded state and in the unloaded state during “slow” and “fast” loading is explained from a unified point of view. It is shown that, upon unloading, the appearance of residual compressive stresses along the direction of the applied force in a considerable portion of grains leads to an abrupt decrease in Mr and μ and to an equally sharp increase in Hc. A slow decrease in Mr and μ and an equally slow increase in Hc are observed in the loaded state with an increase in ε; this effect is caused by an increase in the dislocation density. The values of Mr, μ, and Hc in the transition region of ε ≤ εcr obtained under slow loading differ considerably from those obtained under fast loading. In loaded and unloaded states, the dependences of Mr, μ, and Hc on ε are identical at ε ≥ εcr. The results obtained will be important when the magnetic parameters analyzed in this study are used for nondestructive testing of steel structures that have plastic deformations.


Physics of Metals and Metallography | 2007

Effect of Plastic Deformations and Heat Treatment on the Behavior of the Coercive Force under Load

V. G. Kuleev; T. P. Tsar’kova

Based on the measurements of the dependences of the coercive force of ferromagnetic steels on elastic tensile stresses, its minimum values and the positions of these minima have been found. Using the method of thermal neutron scattering, it has been experimentally proved that the stresses at which the coercive force is minimum is equal to the average value of the residual body stresses (internal stresses of the first kind). The latter were varied over wide limits with the aid of either a preliminary tensile plastic deformation to different degrees (steel St3) or using different tempering regimes after quenching (steel U8). In the first case, large residual compressive stresses arise in a significant part of grains along the direction of loading, which are caused by the anisotropy of Young’s modulus of iron. As a result of compensating these stresses by external tensile stresses, there appears a minimum of the coercive force, whose value is determined by an increase in the dislocation density at the stage of plastic deformation.


Russian Journal of Nondestructive Testing | 2000

Feasibility of NDT of ferromagnetic steel structures based on measurements of residual magnetization as a function of elastic stress

V. G. Kuleev; G. V. Bida; L. A. Atangulova

Algorithms for estimating elastic stress in ferromagnetic steel structures are based on measurements of the residual magnetization Mr as a function of tensile and compressive stress σ0 after quenching and tempering at different temperatures Ttem. The suggested testing technique is highly sensitive because the range of Mr(σ0) is fairly wide (for the interval 0.6σy ≥ σ0 ≥ –0.6σy, where σy is the yield limit, the range is 600–800 kA/m). The necessary condition for using this testing technique is the availability of calibration curves for the selected testing algorithm measured on samples of steels to be tested (i.e., of the same sort of steel tempered at the same temperature). All the testing algorithms suggested in the paper enable one to determine both the magnitude and sign of the stress in the material.


Russian Journal of Nondestructive Testing | 2011

Evaluation of the relative quantity of residually compressed grains in steels after their plastic extension on the basis of remanent magnetization

V. G. Kuleev

The percentage of residually compressed grains was evaluated on the basis of previously obtained experimental data on the change in the remanent magnetization of steel upon unloading after a plastic extension. In this case, only grains in which the residual compressing stresses exceeded the initial (before plastic deformation) average internal deformations of the first type, which resulted in changing their domain structure to the easy-plane type of state, were considered.


Physics of Metals and Metallography | 2009

Effect of Plastic Deformations on the Dependence of the Remanence of Steels on Elastic Tensile Stresses

V. G. Kuleev; T. P. Tsar’kova; Zh. V. Kazantseva

Maximum values of the remanence and the positions of the maxima, which correspond to the average value of body stresses (internal stresses of the first kind), have been found based on the measurements of the dependence of the remanent magnetization of ferromagnetic steels on the elastic tensile stresses. The internal stresses were varied over wide limits with the aid of different amounts of a preliminary plastic tensile deformation. The results obtained make it possible to use magnetic methods of measurements to determine residual stresses and control their changes during exploitation, which offers new possibilities for nondestructive testing of the stress-strain state of articles and constructions.


Russian Journal of Nondestructive Testing | 2002

Coercive Force of a Package of Steel Sheets with Different Degrees of Magnetic Hardness

E. S. Gorkunov; A. M. Povolotskaya; V. G. Kuleev; V. K. Chistyakov; O. B. Korobka

Samples in the form of packages of steel plates with different degrees of magnetic hardness have been studied. Coercive forces of the composite samples with different contributions of harder materials and different orientations of plates with respect to one another in open and closed magnetic circuits have been calculated.


Russian Journal of Nondestructive Testing | 2012

The effect of plastic strain and the orthogonal bias field on the processes of magnetization of low-carbon steel

A. N. Stashkov; A. P. Nichipuruk; M. S. Ogneva; V. G. Kuleev

The field dependences of the differential magnetic permeability on the magnetization curves of annealed and plastically strained specimens from low-carbon 20 steel were investigated. The measurements were performed with the simultaneous action of the magnetizing field and perpendicular bias fields of different magnitudes. The results were obtained for non-strained and pre-strained specimens. It was revealed that application of an orthogonal bias field allowed the separation of the contributions of different domain boundaries (the 180° and 90° boundaries) into the processes of magnetization and remagnetization. The critical fields of 90° transitions will be determined not only by the induced magnetic anisotropy that is due to strain, but also by the magnitude of the applied bias field.


Russian Journal of Nondestructive Testing | 2014

The effect of the plastic tension of steels on the dependences of the coercive force on elastic compressive stresses

V. G. Kuleev; T. P. Tsar’kova

The effect of compressive stresses σ− on the coercive force Hc of annealed isotropic low-carbon steels, which were preliminarily subjected to plastic tension ɛpl+ of different values, has been studied. It was shown that the shape of hysteresis loops Hc(σ−) and their changes with increasing ɛpl+ are related to induced residual compressive and tensile stresses, which result from plastic tension, and also to the occurrence of plastic compressive deformations ɛpl− because of the Bauschinger effect. The causes of the openness of the first cycle of the Hc(σ−) dependence and also for the occurrence of maximum of the Hc(σ−) function in the ascending branch of this cycle are considered. A procedure for determining the residual tensile stresses, which result from the preliminary plastic tension, has been suggested and achieved experimentally. It was shown that the magnetoelastic change of magnetization, which is observed in the plastic compression, can serve as an indicator of these deformations σpl−.


Russian Journal of Nondestructive Testing | 2009

A device for demagnetization of articles of complex compositions under factory conditions

A. P. Nichipuruk; B. A. Khudyakov; M. K. Korkh; M. B. Rigmant; V. G. Kuleev

The problem of demagnetization of packs of ferromagnetic-steel wires or bars of different diameters under factory conditions has been studied. A setup for automatic demagnetization of packs of wires of different diameters has been developed and introduced at the open joint stock company OAO Izhstal’.

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T. P. Tsar’kova

Russian Academy of Sciences

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A. P. Nichipuruk

Russian Academy of Sciences

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V. V. Lopatin

Russian Academy of Sciences

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A. A. Dubov

Russian Academy of Sciences

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A. N. Stashkov

Russian Academy of Sciences

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E. S. Gorkunov

Russian Academy of Sciences

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E. Yu. Sazhina

Russian Academy of Sciences

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L. V. Atangulova

Russian Academy of Sciences

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M. S. Ogneva

Russian Academy of Sciences

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A. M. Povolotskaya

Russian Academy of Sciences

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