Evaluation of surface decarburization depth by magnetic Barkhausen noise technique

Stupakov, O.; Perevertov, O.; Tomáš, I.; Skrbek, Břetislav

doi:10.1016/j.jmmm.2011.01.039

Cited by 37 publications

(22 citation statements)

References 16 publications

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“…Decarburised regions on the wire’s surface appear white in the metallographic images and the microhardness HV0.1 at a depth of approximately 25 μm drops to 365 ± 13, as compared with the nearly untouched regions (such as that illustrated in Figure 2a) in which the microhardness HV0.1 is 454 ± 14. Decarburisation is a thermally initiated process which depletes the carbon content which, in turn, plays the major role when considering the decreased hardness [27]. It is estimated that the decarburisation of the wires, which occurs randomly on their surface, was initiated by the wires’ tempering in the final phase of heat treatment.…”

Section: Resultsmentioning

confidence: 99%

Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique

et al. 2019

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This paper deals with the assessment of a real prestressed tendon by the use of Barkhausen noise emission. The tendon was obtained from a real highway bridge after 33 years in service. Barkhausen noise is studied as a function of the stress state, and the Barkhausen noise signals received directly from the tendon on the real bridge are compared with the Barkhausen noise signals received from the tendon during loading in the laboratory. Assessment of the prestressing is based on the analysis of the effective value of the Barkhausen noise signal as well as the position in which the Barkhausen noise envelopes attain a maximum.

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Section: Resultsmentioning

confidence: 99%

Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique

et al. 2019

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“…For instance, thermal softening of hardened components increases MBN [17], whereas surface hardening decreases MBN [18,19]. Stupakov [20] reported on the marked contribution of the surface decarburized layer to the MBN, whereas Santa-aho [21] demonstrated a decrease of MBN as a result of the thin layer containing only non-ferromagnetic nitrides on the surface after plasma nitridation. 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].…”

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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“…The proportionality constant, i.e. α, depends on eddy currents, probe configuration and measurement conditions [27]. Plotting the time integral of the B N env , α M, versus the excitation magnetic field (H ) produces hysteresis-like loops that have been termed "BN loops" by Stupakov et.…”

Section: Bn Loops and Local Coercivitymentioning

confidence: 99%

“…4a the local coercivity (h c ) can be found from the BN loops for each carbon steel sample. Local coercivity (h c ), also known as BN coercivity [28], has been shown to have strong correlations with bulk coercive force [28,29], energy loss [29], residual stress [30] and decarburization depth [27]. However, the correlation between h c and carbon content has not been investigated previously.…”

Section: Bn Loops and Local Coercivitymentioning

confidence: 99%

Multi-parameter Evaluation of Magnetic Barkhausen Noise in Carbon Steel

2016

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The sensitivity of magnetic Barkhausen noise to many factors has limited its potential application for basic material characterization and detection of residual stress in carbon steel, a common structural material. The present work investigates Barkhausen noise response in plain carbon steel under conditions of varying carbon content, applied elastic stress and different magnetization level. The surface Barkhausen noise measurement system uses a feedback for controlling the flux waveform, which facilitates reproducibility of measurements and also permits extraction of additional parameters from the B-H loop of magnetic circuit. Barkhausen noise parameters correlate with known material parameters, such as coercivity, which vary with carbon content and stress. These results demonstrate the potential for in-situ characterization of carbon steel.

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Evaluation of surface decarburization depth by magnetic Barkhausen noise technique

Cited by 37 publications

References 16 publications

Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique

Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique

Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Multi-parameter Evaluation of Magnetic Barkhausen Noise in Carbon Steel

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