Non-destructive Flaw Mapping of Steel Surfaces by the Continuous Magnetic Barkhausen Noise Method: Detection of Plastic Deformation

2018 ◽  
Vol 37 (2) ◽  
Author(s):  
Freddy Armando Franco Grijalba ◽  
Linilson Rodrigues Padovese
Keyword(s):  
Plastic Deformation ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Steel Surfaces ◽  
Non Destructive

Testing of Hardness on Long Rail Welded Joint by Means of Magnetic Barkhausen Noise Technique

2014 ◽  
Vol 490-491 ◽  
pp. 351-357
Author(s):  
Liang Yin ◽  
Di Shu ◽  
Juan Chen ◽  
Xin Qi
Keyword(s):  
Welded Joint ◽  
Brinell Hardness ◽  
Surface Hardness ◽  
Barkhausen Noise ◽  
Non Destructive Testing ◽  
Magnetic Barkhausen Noise ◽  
Destructive Testing ◽  
Testing Technique ◽  
Non Destructive ◽  
Microstructure Of The Material

The experiment shows that the Magnetic Barkhausen Noise (MBN) signal strongly depends on the elastic deformation, heat treatment state of surface and microstructure of the material, etc. Using the MBN technology that rely on the material characteristics, MBN can be used for testing the surface hardness of 60kg/m U74 seamless rail made by China Harbin welded rail plant. And the testing result obtained by the MBN method is consistent with the results obtained by the Brinell hardness (HB) method. Consequently, this non-destructive testing technique will have a strong life and an extensive market.

scholarly journals Optimisation of amplitude distribution of magnetic Barkhausen noise

2017 ◽  
Vol 68 (5) ◽  
pp. 384-389
Author(s):  
Jozef Pal’a ◽  
Vladimír Jančárik
Keyword(s):  
Measurement Method ◽  
Measurement Accuracy ◽  
Amplitude Distribution ◽  
Barkhausen Noise ◽  
Significant Issue ◽  
Magnetic Barkhausen Noise ◽  
Non Destructive Evaluation ◽  
Treatment Conditions ◽  
Lift Off ◽  
Non Destructive

Abstract The magnetic Barkhausen noise (MBN) measurement method is a widely used non-destructive evaluation technique used for inspection of ferromagnetic materials. Besides other influences, the excitation yoke lift-off is a significant issue of this method deteriorating the measurement accuracy. In this paper, the lift-off effect is analysed mainly on grain oriented Fe-3%Si steel subjected to various heat treatment conditions. Based on investigation of relationship between the amplitude distribution of MBN and lift-off, an approach to suppress the lift-off effect is proposed. Proposed approach utilizes the digital feedback optimising the measurement based on the amplitude distribution of MBN. The results demonstrated that the approach can highly suppress the lift-off effect up to 2 mm.

scholarly journals Study on the Mechanism and Application of Applying Magnetic Barkhausen Noise to Evaluate Dislocation Density and Plastic Deformation

2020 ◽  
Author(s):  
Xueliang Kang ◽  
Shiyun Dong ◽  
Hongbin Wang ◽  
Xiaoting Liu ◽  
Shixing Yan
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Diffraction Method ◽  
Grain Morphology ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
X Ray Diffraction ◽  
X Ray ◽  
Texture Characteristics ◽  
Residual Strains

Seven specimens of 45 steel with different residual strains were prepared by homogeneous plastic tensile test. The microstructure of the specimens was observed by scanning electron microscopy and the texture characteristics of the specimens were studied by X-ray diffraction. The results showed that plastic deformation mainly leads to dislocation increment in the microstructure rather than obvious deformed grain morphology, texture and residual stress. Then the dislocation density of each sample was calculated by X-ray diffraction method. The MBN signals of the samples were tested by magnetic Barkhausen noise method and the corresponding RMS (root mean square) values were calculated. The results showed that the dislocation density increases and the RMS value decreases with the increase of plastic deformation magnitude, the phenomenon was explained deeply. By establishing the correlation between dislocation density and RMS value, it was found that there was a good linear relationship between dislocation density and RMS value. According to the formula provided by the fitting curve, the dislocation density can be predicted by measuring the RMS value of any degree of plastic deformation.

Steel Hardness Determination Using the Barkhausen Noise Effect

2011 ◽  
Vol 495 ◽  
pp. 229-232
Author(s):  
Eirini Varouti ◽  
C. Giannouli ◽  
Z. Petrakou ◽  
K. Sapountzi
Keyword(s):  
Plastic Deformation ◽  
Carbon Steel ◽  
Vickers Hardness ◽  
Mechanical Treatment ◽  
Low Carbon Steel ◽  
Barkhausen Noise ◽  
Low Carbon ◽  
Noise Effect ◽  
Duplex Steel ◽  
Non Destructive

The Barkhausen noise technique (BHN) has been used as a non destructive tool for the measurement of the hardness in various types of steel, namely low carbon steel, TRIP steel, Duplex steel and welding in low carbon steel. The steel samples have undergone different mechanical treatment, such as plastic deformation, cold rolling or welding. Hardness and microhardness have been determined in terms of Vickers standards. A remarkably linear dependence of the BHN on the Vickers hardness of the corresponding samples with an uncertainty in the order of 3-5% has been achieved, illustrating that the BHN may be used as a non destructive tool for determining the Vickers hardness in steels. Furthermore, BHN measurements have obtained on the welding area, along the thermally affected zone and the weld itself, illustrating the theoretically expected stress field distribution.

Correlation of Magnetic Barkhausen Noise with Microstructure in the In-Depth Direction of a Railhead

2014 ◽  
Vol 605 ◽  
pp. 677-680
Author(s):  
Charalampos Sokos
Keyword(s):  
Mechanical Properties ◽  
Vital Role ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Damage Initiation ◽  
Depth Direction ◽  
Non Destructive ◽  
Evaluation Techniques ◽  
Magnetic Steel

The characterization of microstructures, mechanical properties, deformation, damage initiation, and growth by Non-Destructive Evaluation techniques is assuming a vital role in various materials. In this paper, the use of Magnetic Barkhausen Noise technique for characterization of mechanical properties in magnetic steel would be discussed. The results have shown that hardening depth and its quality with respect to the microstructure in induction hardened specimens could also be established using the Magnetic Barkhausen Noise technique.

Stress State Determination in Boat Welding Using Magnetic Barkhausen Noise

2014 ◽  
Vol 605 ◽  
pp. 633-636
Author(s):  
Kaliopi Hliadi
Keyword(s):  
Stress State ◽  
Ferromagnetic Materials ◽  
Physical Principle ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Destructive Testing ◽  
Magnetic Techniques ◽  
Stress Dependent ◽  
The Impact ◽  
Non Destructive

The impact of stress on changes in magnetization is one of the most complex issues of magnetism. Magnetic techniques are the most important non-destructive testing technologies to characterize the mechanical features of ferromagnetic materials based on the physical principle of magnetic-stress coupling. Magnetic Barkhausen Noise measurement was used in order to estimate stress state in boat welding. The results have shown that magnetic properties of ferromagnetic materials are stress-dependent. A qualitative correlation was found between places with residual stress and areas with increased values of the gradients of the magnetic Barkhausen noise components. Further research is now in progress in order to develop the quantitative relationships.

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