Employment of Barkhausen Noise Technique for Assessment of Prestressing Bars Damage with Respect of Their Over-Stressing

This paper investigates the potential of a non-destructive magnetic technique based on Barkhausen noise emission for the monitoring of prestressing bars with respect to their undesired over-stressing. Barkhausen noise signals are correlated with tensile stress, residual stresses, and microhardness measurements. It was found that prestressing bars exhibit strong magnetic anisotropy which becomes more pronounced along with the increasing degree of the bar’s over-stressing. Barkhausen noise emission becomes strongly attenuated in the direction of the tensile stress at the expense of the perpendicular direction. However, the Barkhausen noise emission in the direction of the tensile stress exhibits a continuous and remarkable decrease, whereas the Barkhausen noise steep increase for lower degrees of over-stressing is followed by early saturation for higher over-stressing. This study demonstrates that the Barkhausen noise technique is capable of distinguishing between the prestressing bars loaded below yielding, and those which are over-stressed.

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Analysis of Magnetic Anisotropy and Non-Homogeneity of S235 Ship Structure Steel after Plastic Straining by the Use of Barkhausen Noise

Materials ◽

10.3390/ma13204588 ◽

2020 ◽

Vol 13 (20) ◽

pp. 4588

Author(s):

Martin Jurkovič ◽

Tomáš Kalina ◽

Katarína Zgútová ◽

Miroslav Neslušan ◽

Martin Pitoňák

Keyword(s):

Magnetic Anisotropy ◽

Tensile Deformation ◽

Uniaxial Tensile ◽

Barkhausen Noise ◽

Noise Emission ◽

Ship Structure ◽

Residual Stress State ◽

Reliable Monitoring ◽

The Matrix ◽

Non Destructive

This study investigates the microstructure, residual stress state, and the corresponding magnetic anisotropy of the ship structure samples made of S235 steel after uniaxial tensile deformation. A non-destructive magnetic technique based on Barkhausen noise is employed for fast and reliable monitoring of samples exposed to the variable degrees of plastic straining. It was found that the progressively developed plastic straining of the matrix results in an alteration of the easy axis of magnetization, stress anisotropy (expressed in residual stresses state) as well as the corresponding Barkhausen noise emission. Moreover, remarkable non-homogeneity can be found within the plastically strained region, especially when the localized plastic straining takes place.

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Characterization of the Residual Stresses in Plastically Deformed Ferrite-Martensite Steels Using Barkhausen Noise Measurements

Materials Science Forum ◽

10.4028/www.scientific.net/msf.500-501.655 ◽

2005 ◽

Vol 500-501 ◽

pp. 655-662 ◽

Cited By ~ 1

Author(s):

Xavier Kleber ◽

Aurélie Hug-Amalric ◽

Jacques Merlin

Keyword(s):

Plastic Deformation ◽

Tensile Stress ◽

Residual Stresses ◽

Barkhausen Noise ◽

Opposite Behavior ◽

Noise Measurements ◽

Two Phases ◽

Noise Signature ◽

Compressive Residual Stresses

In this work, we show that the measurement of the Barkhausen noise allows the residual stresses in each of the two phases of ferrite-martensite steels to be characterized. We have first studied the effect of a tensile and a compressive stress on the Barkhausen noise signature. We observed that for a ferrite-martensite steel, the application of a tensile stress increases the Barkhausen activity of the martensite and ferrite phases, whereas a compressive one reduces it. In a second time, we induced residual stresses by applying a plastic deformation to ferrite-martensite steels. After a tensile plastic deformation, we observed that (i) compressive residual stresses appear in ferrite, and (ii) tensile residual stresses appear in martensite. An opposite behavior is observed after a compressive plastic deformation. These results show that the Barkhausen noise measurement makes it possible to highlight in a nondestructive way the distribution of the stresses in each of the two phases of a ferrite-martensite steel. This result could be used to characterize industrial Dual- Phases steels that are plastically deformed during mechanical processes.

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Non-Destructive Evaluation of Steel Surfaces after Severe Plastic Deformation via the Barkhausen Noise Technique

Metals ◽

10.3390/met8121029 ◽

2018 ◽

Vol 8 (12) ◽

pp. 1029 ◽

Cited By ~ 7

Author(s):

Miroslav Neslušan ◽

Libor Trško ◽

Peter Minárik ◽

Jiří Čapek ◽

Jozef Bronček ◽

...

Keyword(s):

Shot Peening ◽

Progressive Increase ◽

Noise Signal ◽

Barkhausen Noise ◽

Noise Emission ◽

Non Destructive Evaluation ◽

Almen Intensity ◽

The Relationship ◽

Non Destructive ◽

Severe Shot Peening

This paper reports about the non-destructive evaluation of surfaces after severe shot peening via the Barkhausen noise technique. Residuals stresses and the corresponding Almen intensity, as well as microstructure alterations, are correlated with the Barkhausen noise signal and its extracted features. It was found that residual stresses as well as the Barkhausen noise exhibit a valuable anisotropy. For this reason, the relationship between the Barkhausen noise and stress state is more complicated. On the other hand, the near-the-surface layer exhibits a remarkable deformation induced softening, expressed in terms of the microhardness and the corresponding crystalline size. Such an effect explains the progressive increase of the Barkhausen noise emission along with the shot-peening time. Therefore, the Barkhausen noise can be considered as a promising technique capable of distinguishing between the variable regimes of severe shoot peening.

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Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Coatings ◽

10.3390/coatings11030263 ◽

2021 ◽

Vol 11 (3) ◽

pp. 263

Author(s):

Katarína Zgútová ◽

Martin Pitoňák

Keyword(s):

Corrosion Resistance ◽

Stress State ◽

Magnetic Fields ◽

Tensile Stress ◽

Coating Thickness ◽

Barkhausen Noise ◽

Noise Emission ◽

The Real ◽

And Shifts ◽

The Relationship

Monitoring of the stress state of bridges by the use of the Barkhausen noise technique has been already introduced and this method can be adapted for monitoring of component’s overstressing. Measurement of Barkhausen noise on real bridges is carried out through the coating applied as a layer to increase the corrosion resistance of bodies. However, it was found that the thickness of the coating could vary, which in turn affects the Barkhausen noise signals and makes it difficult to assess the real stress state. For this reason, this paper deals with attenuation of Barkhausen noise emission due to variable thicknesses of coatings on the steel S460MC. It was found that increasing the thickness progressively decreases the Barkhausen noise emission and shifts the Barkhausen noise envelopes to the higher magnetic fields. Furthermore, the thickness of the coating also affects the relationship between the tensile stress and the Barkhausen noise.

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Usage of Barkhausen Noise for Assessment of Corrosion Damage on Different Low Alloyed Steels

Applied Sciences ◽

10.3390/app112210646 ◽

2021 ◽

Vol 11 (22) ◽

pp. 10646

Author(s):

Filip Pastorek ◽

Martin Decký ◽

Miroslav Neslušan ◽

Martin Pitoňák

Keyword(s):

Salt Spray ◽

Corrosion Damage ◽

Noise Signal ◽

Peak Position ◽

Barkhausen Noise ◽

Variable Degree ◽

Neutral Salt ◽

Noise Emission ◽

Corrosion Attack ◽

Non Destructive

This study deals with corrosion damage of low alloyed feritic steels of variable strength. Three different steels of nominal yield strength 235, 700 and 1100 MPa were subjected to the variable degree of corrosion attack developed in the corrosion chamber under a neutral salt spray (NSS) atmosphere. The corrosion damage was investigated by the use of conventional metallographic observations when the thickness of corroded layer was quantified. Moreover, non-destructive magnetic technique, based on Barkhausen noise, was also employed. It was found that the rate of corrosion damage decreases along with the increasing number of days in the chamber. The similar evolution can be also found for Barkhausen noise emission and the extracted parameters from the emission. It can be reported that conventional rms value of Barkhausen noise signal as well as FWHM (full width at half maximum of Barkhausen noise envelope) can be linked with the corrosion extent, especially in the early phases of corrosion attack. The PP (peak position of Barkhausen noise envelope) values exhibit poor sensitivity.

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Characterization of Residual Stresses and Microstructural by Technique of Magnetic Barkhausen Noise of API 5L X80 Steel Heat Treatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.869.556 ◽

2016 ◽

Vol 869 ◽

pp. 556-561 ◽

Cited By ~ 1

Author(s):

Sandro Rosa Correa ◽

Marcos Flavio de Campos ◽

C.J. Marcelo ◽

José Adilson de Castro ◽

Maria Cindra Fonseca ◽

...

Keyword(s):

Residual Stresses ◽

Barkhausen Noise ◽

Magnetic Barkhausen Noise ◽

X Ray Diffraction ◽

X80 Steel ◽

Work Samples ◽

Non Destructive ◽

Different Levels ◽

Steel Heat

Residual stresses typically are generated during the manufacturing process of mechanical components. The non-destructive techniques are quite sensitive to these residual stresses, and to microstructural changes resulting from thermal cycling. In this work, samples of API 5L X80 steel were exposed to several conditions of cooling, under water, air and oil, thus obtaining different microstructures and different levels of residual stresses. The residual stress measurements were made using the methods of Magnetic Barkhausen Noise and X-ray diffraction.

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Influence of Components Bending on the Consecutive Plasma Nitridation and Barkhausen Noise Emission

Communications - Scientific letters of the University of Zilina ◽

10.26552/com.c.2019.1.22-27 ◽

2019 ◽

Vol 21 (1) ◽

pp. 22-27

Author(s):

Miroslav Neslusan ◽

Jan Moravec

Keyword(s):

Plasma Nitriding ◽

Surface States ◽

Compound Layer ◽

Barkhausen Noise ◽

Noise Emission ◽

Destructive Testing ◽

Flat Surfaces ◽

Plasma Nitridation ◽

Non Destructive Evaluation ◽

Non Destructive

This paper deals with the non destructive evaluation of components after the plasma nitridation via the Barkhausen noise techniques. Effect of different surface states before the plasma nitriding is studied via the non destructive Barkhausen noise technique, as well as the conventional destructive techniques. Bending of flat samples to different bending angles was performed and magnetic, as well as conventional destructive testing, was carried out on the outer, inner and flat surfaces. The results of experiments show that the Barkhausen noise emission is a function of the heat treatment, whereas intensity of bending and the corresponding deformation are only minor. The different states of the surface before the plasma nitriding result into the similar thickness of the compound layer. Furthermore, the underlying diffusion of near the surface layer state is different.

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