Portable instruments for multiparameter magnetic evaluation of material structures

Костин, В. Н.; Osintsev, A. A.; Сташков, А. Н.; Ничипурук, А. П.; Kostin, K. V.; Sazhina, E. Yu.

doi:10.1134/s1061830908040086

Cited by 26 publications

(11 citation statements)

References 2 publications

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“…The residual magnetic induction measured in an open circuit becomes the measure of coercivity of the object material [9]. In all the men tioned cases, the value of the magnetic field in an object is evaluated on the basis of the current in magne tizing windings of an electromagnet.In contrast to the aforementioned instruments, the operation of magnetic multitesters (MMTs) and a multiparameter hardware-software system (SIMTEST) is based on the technique for measuring the mag netic flux in an article using a hole-transducer, which is made in the magnetic circuit of an electromagnet [14,15]. The special shape of the hole (a narrow slot that is perpendicular to the flux direction) provides proportionality between the field strength in the hole and the magnetic flux value in the combined circuit.…”

mentioning

confidence: 99%

“…In contrast to the aforementioned instruments, the operation of magnetic multitesters (MMTs) and a multiparameter hardware-software system (SIMTEST) is based on the technique for measuring the mag netic flux in an article using a hole-transducer, which is made in the magnetic circuit of an electromagnet [14,15]. The special shape of the hole (a narrow slot that is perpendicular to the flux direction) provides proportionality between the field strength in the hole and the magnetic flux value in the combined circuit.…”

mentioning

confidence: 99%

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The topography of the field and flux inside and above the surfaces of ferromagnetic plates during their contact and contactless magnetization

Vasilenko

Костин

2013

Russ J Nondestruct Test

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Magnetic methods for determining the structural-phase and stressed-strained states are based on measuring magnetic testing parameters (coercive force, residual magnetization, initial permeability, etc.) and the subsequent estimation of the inspected parameters (hardness, ultimate strength, level of internal stresses, etc.) of critical objects on their basis. Local measurements of magnetic parameters are most fre quently performed using attachable transducers. Coercimeters [1][2][3][4][5][6] and magnetic structuroscopes [7][8][9] are examples of such testing tools. A U shaped electromagnet with a magnetic flux sensor, which is built into it, usually serves as the measuring transducer. A loop flux gate [1, 2] or a Hall probe, which is placed in the magnet gap (e.g., КИФМ 1Х and КИМ 2М соеrcimeters) [1][2][3][4] or located near the magnetic core and registers the leakage flux [1,5], can be used as the magnetic flux sensor. In the case of a loop flux gate or a Hall probe near a magnetic circuit, the transducer-object combined circuit remains closed, but as a result of a nonlinear and ambiguous dependence of readings of such transducers on the flux value, they can be used only as null indicators. The cross section of the magnetic circuit leads to the opening of the transducer-object combined circuit, and as a result, the measured magnetic parameters will correspond to the magnetic properties of the body but not the substance [6,[9][10][11][12][13]. The residual magnetic induction measured in an open circuit becomes the measure of coercivity of the object material [9]. In all the men tioned cases, the value of the magnetic field in an object is evaluated on the basis of the current in magne tizing windings of an electromagnet.In contrast to the aforementioned instruments, the operation of magnetic multitesters (MMTs) and a multiparameter hardware-software system (SIMTEST) is based on the technique for measuring the mag netic flux in an article using a hole-transducer, which is made in the magnetic circuit of an electromagnet [14,15]. The special shape of the hole (a narrow slot that is perpendicular to the flux direction) provides proportionality between the field strength in the hole and the magnetic flux value in the combined circuit. The area of the slot is much smaller than that of the cross sectional area of the magnetic circuit; i.e., the transducer-object combined circuit remains closed. The value of the magnetic field in an object is evalu ated using the value of the tangential component of the magnetic field at the object surface in the interpole Abstract-Modeling and experimental studies of the spatial distributions of the field and flux inside and above the surface of ferromagnetic plates of different dimension types, which were locally magne tized by U shaped electromagnets, were performed. It was established that the location of a magnetic inhomogeneity in the interpole zone of an electromagnet substantially affects the results of a local measurement of the coercive force using a demagnetization current. ...

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confidence: 99%

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confidence: 99%

The topography of the field and flux inside and above the surfaces of ferromagnetic plates during their contact and contactless magnetization

Vasilenko

Костин

2013

Russ J Nondestruct Test

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“…As it follows from the obtained results, the field H p correlates with the calculated field H A ; however, H p can be easily measured with existing devices unlike H A [14,15]. Thus, it is possible to test the depth of the hardened layer by the magnetic field value measured on the surface of a locally magnetized object.…”

Section: Resultsmentioning

confidence: 92%

“…To define a more appropriate inspection parameter, field intensity H p is measured by a SIMTEST device [14,15]. This field is achieved in the center of the interpolar space (point A) on the surface of two-layer objects after they are magnetized by a U-shaped electromagnet with subsequent magnetization reversal along the descending hysteresis loop branch until reaching a fixed magnetic flux value [16].…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional distribution of the magnetic field and the flux in locally magnetized two-layer ferromagnetic objects

Костин¹,

Vasilenko²,

Porseva³

et al. 2016

AIP Conference Proceedings

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“…The magnetic characteristics (the coercive force H c and the saturation magnetization M s ) were measured at a ballistic setup and as the SIMTEST hardware and software complex developed at IMP [7]. This device is intended for measuring the magnetic characteristics of substances; the high coefficient of correlation R = 0.99 between the coercive force H c measured at the ballistic setup and E Hc measured with SIMTEST testify to this.…”

Section: Abstract-mentioning

confidence: 99%

A magnetic method for determining the concentration of residual austenite in maraging steels

Сташков

Somova

Sazhina

et al. 2011

Russ J Nondestruct Test

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810Maraging steels are widely used in shipbuilding, the aviation industry, and rocket production. Their advantages are associated with high strength combined with sufficient plasticity and high corrosion resis tance, good weldability, and the property of hot and cold plastic deformation. The drawbacks of these steels are related to the fact that variations in the chemical composition within the steel grade (e.g., in C and Ti) can substantially change the mechanical properties in the aged state. In addition, the mechanical properties substantially depend on the concentration of residual austenite, its stability, and alloying [1,2]. Thus, the technological process is developed depending on the purpose of the items that are made of these steels, as a result of which the concentration of residual austenite in their microstructure is regulated within a rather narrow range; thus, the optimal combination of mechanical properties is reached. As the result, it becomes necessary to develop nondestructive methods for evaluating the concentrations of resid ual austenite in the microstructures of ready made items.As shown by Apaev [3], the most suitable parameter for controlling the concentration of residual aus tenite is saturation magnetization. For example, specialists of the Institute of Metal Physics (IMP) devel oped a differential magnetic device that was designed for determining the concentration of residual austenite based on the measurements of the magnetization close to saturation in hardened and tempered items from ShKh15 steel [4]. However, when using this method for evaluating the concentration of residual austenite in martensite aging steels, they found a substantial spread in the obtained magnetization values [5].The saturation magnetization M s is known to be a characteristic that is sensitive to phase and chemical steel composition; thus, the obtained spread in the obtained saturation magnetization values can be explained by two factors. First, depending on the type of thermal treatment, the time of exposure at the specified temperatures, and heating and cooling rates, the martensite and the residual austenite in steels of such grade will differ in the degree of their alloying. For example, the concentration of nickel in residual austenite may substantially exceed that in the chemical composition of steel. Second, precipitation of par ticles of the second phase (intermetallic compounds, etc.) is accompanied by depletion of martensite with iron and nickel atoms, which should yield a decrease in magnetization. The testing reliability in this case can be increased by selecting a corresponding reference. This is a very complicated problem [3] since at the assigned concentration of residual austenite, the saturation magnetization of the martensite phase of the reference and tested objects should have similar values.Kifer [6] proposed using the internal demagnetization coefficient N i for studying the porosities of pow dered materials. Since the particles of residual paramagnetic austenite can be considered as pore...

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Portable instruments for multiparameter magnetic evaluation of material structures

Cited by 26 publications

References 2 publications

The topography of the field and flux inside and above the surfaces of ferromagnetic plates during their contact and contactless magnetization

The topography of the field and flux inside and above the surfaces of ferromagnetic plates during their contact and contactless magnetization

Three-dimensional distribution of the magnetic field and the flux in locally magnetized two-layer ferromagnetic objects

A magnetic method for determining the concentration of residual austenite in maraging steels

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