Magnetic Barkhausen Noise Method Research Articles

Comprehensive analysis of Barkhausen noise properties in the cold rolled mild steel

Low carbon steel specimens cold rolled at ratios of 0%, 5%, 10%, 20% and 40% have been comprehensively investigated by magnetic Barkhausen noise method, and their microstructures were studied by transmission electron microscope. A broad peak formed between 15 and 60 kHz in the fast Fourier transformation spectrum increases with rolling ratio. Barkhausen noise energy and rms voltage rise rapidly with cold rolling below 20%, and saturate at higher rolling ratio. This phenomenon is attributed to the combined effects of cell texture and dislocation density.

Comparison of magnetic Barkhausen noise and ultrasonic velocity measurements for microstructure evaluation of SAE 1040 and SAE 4140 steels

The aim of this study is to compare the performance of magnetic Barkhausen noise and ultrasonic methods for the evaluation of the microstructure of commercial steels. Following the austenitization of the specimens made of SAE 1040 and SAE 4140, various heat treatments were carried out to obtain microstructures consisting of martensite, tempered martensite, fine pearlite–ferrite, and coarse pearlite–ferrite. The microstructures were initially characterized by SEM investigation and hardness measurements. The magnitude and position of Barkhausen noise peaks were determined via a commercial system. The propagation rates of longitudinal waves were determined with the ultrasonic pulse-echo technique. Barkhausen noise response and sound velocity goes to minimum for the as-quenched martensite, and both tend to increase in the following sequence: tempered martensite, fine pearlite–ferrite, and coarse pearlite–ferrite. However, the magnetic features are more sensitive to the microstructure variations than to the sound velocity.

Investigation of as-quenched and tempered commercial steels by Magnetic Barkhausen Noise method

This study aims to characterise as-quenched and tempered steels by the Magnetic Barkhausen Noise method, and to contribute to optimisation of heat treatment processes. Identical austenitisation and quenching procedures were applied to SAE 1040 and SAE 4140 specimens to eliminate the effect of grain size. Samples were tempered at 200°C and 600°C for 2 hours. Microstructures were characterised by metallographic examinations and hardness measurements. Amplitude, position and frequency spectrum of signals were evaluated using a commercial system. As the tempering temperature increases, in contrast to the reduction in hardness, magnetic response increases due to the enhancement of domain wall displacement.

Determination of welding residual stress distribution in API X65 pipeline using a modified magnetic Barkhausen noise method

A modified magnetic Barkhausen noise (MBN) method was applied to obtain the residual stress distribution in an API X65 pipeline weldment. Different weldment microstructures affected the magnetic response and yielded different MBN values. In order to reflect the microstructural variations in the heat-affected zone (HAZ), calibration samples were extracted from four different regions: weld metal, coarse-grained HAZ (CGHAZ), fine-grained HAZ (FGHAZ), and base metal. This approach yielded that compressive residual stresses existed in the CGHAZ contrary to the tensile results using the base-metal-based calibration method. Compared with the results from the mechanical saw-cutting method, it can be concluded that the data obtained with the HAZ-based calibration method were more reliable.

Determination of shot peened surface states using the magnetic Barkhausen noise method : 50262 Hauk, V.; Holler, P.; Oudelhoven, R.; Theiner, W.A. Nondestructive Characterization of Materials, 3rd International Symposium, Saarbrucken (Germany), 3–6 Oct. 1988. pp. 466–473. Edited by P. Holler, V. Hauk, G. Dobmann, C.O. Ruud, and R.E. Green, Springer-Verlag (1989)

Determination of shot peened surface states using the magnetic Barkhausen noise method : 50262 Hauk, V.; Holler, P.; Oudelhoven, R.; Theiner, W.A. Nondestructive Characterization of Materials, 3rd International Symposium, Saarbrucken (Germany), 3–6 Oct. 1988. pp. 466–473. Edited by P. Holler, V. Hauk, G. Dobmann, C.O. Ruud, and R.E. Green, Springer-Verlag (1989)

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : 40888 Theiner, W.A.; Hauk, V. Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : 40888 Theiner, W.A.; Hauk, V. Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989

Application of magnetic Barkhausen noise method to nondestructive evaluation of welded part (In Japanese: English abstract) : 42299 Furuya, Y.; Shimada, H. Journal of the Japanese Society of Nondestructive Inspection, Vol. 38, No. 5, pp. 426–431 (May 1989)

Application of magnetic Barkhausen noise method to nondestructive evaluation of welded part (In Japanese: English abstract) : 42299 Furuya, Y.; Shimada, H. Journal of the Japanese Society of Nondestructive Inspection, Vol. 38, No. 5, pp. 426–431 (May 1989)

Influence of tensile stress in steel cables on magnetic Barkhausen noise

The magnetic Barkhausen noise (BN) method can be applied for stress measurement in ferromagnetic steel cables. The cable is led through magnetizing and sensing coils, and the induced noise is amplified and measured. Seven-wire strands used in reinforced concrete steel rope used by cranes and zinc-coated steel rope are the cables tested. The BN changes with applied tensile stress in all these materials. As tensile stress increases, the magnitude of BN decreases and coercive force increases. The origin of this phenomenon is studied in relation to microstructure and X-ray diffraction (XRD) analysis. Based on the results, one utilization of BN for stress measurement is considered.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands), 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands), 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989

Application of magnetic Barkhausen noise method to nondestructive evaluation of welded part (In Japanese: English abstract) : Journal of the Japanese Society of Nondestructive Inspection, Vol. 38, No. 5, pp. 426–431 (May 1989)

Application of magnetic Barkhausen noise method to nondestructive evaluation of welded part (In Japanese: English abstract) : Journal of the Japanese Society of Nondestructive Inspection, Vol. 38, No. 5, pp. 426–431 (May 1989)

Nondestructive evaluation of embrittlement of 3Ni-Cr-Mo-V rotor steel by the magnetic Barkhausen noise method.

Nondestructive evaluation of embrittlement of 3Ni-Cr-Mo-V rotor steel by the magnetic Barkhausen noise method.

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : Theiner, W.A.; Hunk, V. Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989

Nondestructive characterization of shot peened surface states by the magnetic Barkhausen noise method : Theiner, W.A.; Hunk, V. Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23–28 Apr. 1989, Vol. 1, pp. 583–587. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989