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

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.

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

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1029 ◽  
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.

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

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3450 ◽  
Author(s):  
Miroslav Neslušan ◽  
František Bahleda ◽  
Martin Moravčík ◽  
Katarína Zgútová ◽  
Filip Pastorek
Keyword(s):  
Stress State ◽  
Noise Signal ◽  
Barkhausen Noise ◽  
Highway Bridge ◽  
Noise Emission ◽  
Laboratory Assessment ◽  
The Real

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.

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

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 770
Author(s):  
František Bahleda ◽  
Ivan Drevený ◽  
Martin Pitoňák ◽  
Miroslav Neslušan ◽  
Peter Koteš
Keyword(s):  
Tensile Stress ◽  
Residual Stresses ◽  
Magnetic Anisotropy ◽  
Perpendicular Direction ◽  
Barkhausen Noise ◽  
Noise Emission ◽  
Steep Increase ◽  
Non Destructive

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.

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

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.

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

Materials ◽  
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.

Non-destructive monitoring of corrosion extent in steel rope wires via Barkhausen noise emission

2019 ◽  
Vol 484 ◽  
pp. 179-187 ◽  
Author(s):  
M. Neslušan ◽  
F. Bahleda ◽  
P. Minárik ◽  
K. Zgútová ◽  
M. Jambor
Keyword(s):  
Barkhausen Noise ◽  
Noise Emission ◽  
Steel Rope ◽  
Non Destructive

Non-Destructive Analysis of Surfaces after Hard Milling Based on Barkhausen Noise Technique

2015 ◽  
Vol 662 ◽  
pp. 213-216
Author(s):  
Miroslav Neslušan ◽  
Tomáš Hrabovský ◽  
Kamil Kolařík ◽  
Anna Mičietová
Keyword(s):  
Elevated Temperatures ◽  
Peak Position ◽  
Bearing Steel ◽  
Theoretical Background ◽  
Barkhausen Noise ◽  
Magnetic Domains ◽  
Hard Milling ◽  
Near Surface ◽  
Roll Bearing ◽  
Non Destructive

This paper deals with the non-destructive evaluation of surface made of hardened roll bearing steel after hard milling via Barkhausen noise technique. The paper discusses magnetic anisotropy linked with the structure transformations with regard to variable flank wear of cutting tool. Effective value of Barkhausen noise (BN) and Peak Position derived from the raw BN signal as well as BN envelopes are compared with metallographic observations and theoretical background about magnetic domains reconfiguration when the near surface undergoes severe plastic deformation at elevated temperatures.

scholarly journals Investigation of Barkhausen Noise Emission in Steel Wires Subjected to Different Surface Treatments

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 912
Author(s):  
Lukáš Krkoška ◽  
Martin Moravčík ◽  
Katarína Zgútová ◽  
Miroslav Neslušan ◽  
Milan Uhričík ◽  
...  
Keyword(s):  
Surface State ◽  
Barkhausen Noise ◽  
Noise Emission ◽  
Corrosion Attack ◽  
Main Bearing ◽  
Cross Sectional ◽  
Near Surface ◽  
Term Operation ◽  
Steel Rope ◽  
Steel Wires

Steel rope wires represent the main bearing components of bridges whose long-term operation depends on loading conditions, corrosion attack, and/or pre-stressing. Corrosion attack especially can remarkably reduce the effective cross-sectional area, which in turn over-stresses the wires and redistributes stress to the neighboring wires. The premature collapse of many bridges is very often caused by wire rupture as a result of their poor corrosion protection. For these reasons, various processes—such as galvanizing, phosphating, etc.—have been applied to steel wires to increase their resistance against corrosion. However, these processes can alter the microstructure, especially in the near-surface regions. The Barkhausen noise technique has been already reported as a suitable technique for investigating corrosion extent and true pre-stress in the steel rope wires. This study reports that non-homogeneity of the surface state of wires undergoing different surface treatment makes it more difficult to assess the true stress state and increase the uncertainty of Barkhausen noise measurement. Barkhausen noise signals are correlated with metallographic and SEM observations as well as microhardness measurements. The non-homogeneity of the surface state of wires is also investigated by the use of chemical mapping and linear chemical analyses.

scholarly journals Influence of steel sheets surface state on evaluation of cadmium coatings in salt spray

2014 ◽  
Vol 58 (2) ◽  
pp. 48-51
Author(s):  
A. Faltýnková ◽  
M. Hruška ◽  
J. Kudláček
Keyword(s):  
Surface State ◽  
Salt Spray ◽  
Neutral Salt ◽  
Corrosion Attack ◽  
Surface Pretreatment ◽  
Steel Sheets ◽  
Cadmium Plating ◽  
Metal Sheets ◽  
The Status ◽  
Steel Panels

Abstract The work is focused on the evaluation of cadmium layer corrosion according to Boeing specification and how is the status of the underlying material influenced by the corrosion. Plating was applied on the steel panels (type 4130). These metal sheets were partially corroded, therefore there were chosen various surface pretreatment, which removed the corrosion attack and subsequently cadmium plating was carried out. Corrosion neutral salt spray test for 336 hours was done according to ASTM B117.

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