Monitoring of Thermal Damage after Deposition of Coatings via Barkhausen Noise Technique

Čilliková, Mária; Uríček, Juraj; Neslušan, Miroslav; Ballo, V.; Mičietová, Anna

doi:10.12693/aphyspola.137.637

Cited by 6 publications

(4 citation statements)

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“…The plasma nitriding process produces a surface layer of several micrometers in thickness and this layer, together with alteration of the underlying diffusion layer, decreases MBN [22,23]. Čillikova et al [24] also reported about MBN originating from the hardened components subjected to the coating process, and compared samples undergoing different coating regimes and the corresponding thickness of the near surface non-ferromagnetic layer, and the underlying ferromagnetic matrix.…”

Section: Introductionmentioning

confidence: 99%

Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Zgútová

Pitoňák

2021

Coatings

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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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Section: Introductionmentioning

confidence: 99%

Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Zgútová

Pitoňák

2021

Coatings

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“…Decrease of MBN in the TD is slowed down since the increasing dislocation density and corresponding magnetic hardness is compensated by the aforementioned alignment of DWs into the TD. The evolution of MBN corresponds with the evolution of PP as the quantity correlated with the magnetic hardness of the body and therefore, the opposition of the matrix against DWs motion [4,30,31]. Figure 9 depicts that the higher MBN can be linked with The evolution of MBN corresponds with the evolution of PP as the quantity correlated with the magnetic hardness of the body and therefore, the opposition of the matrix against DWs motion [4,30,31].…”

Section: Mbn Measurementsmentioning

confidence: 96%

“…The evolution of MBN corresponds with the evolution of PP as the quantity correlated with the magnetic hardness of the body and therefore, the opposition of the matrix against DWs motion [4,30,31]. Figure 9 depicts that the higher MBN can be linked with The evolution of MBN corresponds with the evolution of PP as the quantity correlated with the magnetic hardness of the body and therefore, the opposition of the matrix against DWs motion [4,30,31]. Figure 9 depicts that the higher MBN can be linked with lower PP, and vice versa.…”

Section: Mbn Measurementsmentioning

confidence: 99%

Investigation of Magnetic Anisotropy and Barkhausen Noise Asymmetry Resulting from Uniaxial Plastic Deformation of Steel S235

et al. 2021

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This study investigates alterations in magnetic anisotropy and the marked asymmetry in Barkhausen noise (MBN) signals after the uniaxial plastic straining of steel S235 obtained from a shipyard and used as standard structural steel in shipbuilding. It was found that the initial easy axis of magnetisation in the direction of previous rolling, and also in the direction of loading, becomes the hard axis of magnetisation as soon as the plastic strain attains the critical threshold. This behaviour is due to the preferential matrix orientation and the corresponding realignment of the magneto-crystalline anisotropy. Apart from the angular dependence of MBN, the asymmetry in the consecutive MBN bursts at the lower plastic strains is also analysed and explained as a result of magnetic coupling between the grains plastically strained and those unaffected by the tensile test. It was found that, by increasing the degree of plastic strain, the marked asymmetry in MBN tends to vanish. Moreover, the asymmetry in MBN bursts occurs in the direction of uniaxial tension and disappears in the perpendicular direction. Besides the MBN technique, XRD and EBSD techniques were also employed in order to provide a deeper insight into the investigated aspects.

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“…This technique was also employed for monitoring coating heterogeneity in the case of steel S460MC [ 13 ]. Čillikova et al [ 14 ] also demonstrated that the MBN technique is sensitive to the coating generated under the variable regimes of heat treatment, and MBN is a function of matrix softening during annealing. Santa-aho [ 15 ] reported a decrease of MBN when the thin layer of non-ferromagnetic nitrides can be found on the surface.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Measurement of Zn Layer Heterogeneity on the Flange of the Steel Road Barrier

et al. 2022

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This study deals with monitoring of Zn layer heterogeneity on the flange of steel road barriers using magnetic measurements. The Barkhausen noise technique is employed for such purpose, and parameters extracted from Barkhausen noise signals are correlated with the true thickness of the Zn layer. The true values of the Zn layer were obtained from the metallographic images, as well as the thickness gauge CM-8825FN (Guangzhou Landtek Instruments Co. Ltd., Guangzhou, China) device. It was observed that the diffusion region lies below the Zn protective layer, which makes the thickness of the Zn layer obtained from the CM-8825FN device thicker than that measured on the metallographic images. For this reason, the chemical gradient of Zn below the Zn layer can be reported, and it affects Barkhausen noise emission. Barkhausen noise decreases along with increasing thickness of the Zn layer, and Barkhausen noise envelopes are shifted to stronger magnetic fields. The number of strong MBN pulses drops down with the increasing thickness of Zn coating at the expense of the increasing number of the weak MBN pulses. The thickness of Zn coating can be polluted by the solidification of Zn melt after galvanizing. The presence of the diffusion layer dims the contrast between ferromagnetic and paramagnetic phases.

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Monitoring of Thermal Damage after Deposition of Coatings via Barkhausen Noise Technique

Cited by 6 publications

References 0 publications

Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Investigation of Magnetic Anisotropy and Barkhausen Noise Asymmetry Resulting from Uniaxial Plastic Deformation of Steel S235

Magnetic Measurement of Zn Layer Heterogeneity on the Flange of the Steel Road Barrier

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