MEASUREMENT OF BARKHAUSEN EMISSION AND MAGNETOACOUSTIC EMISSION FROM A FRACTURED STEEL BAR
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摘要Barkhausen emission (BE) and magnetoacoustic emission (MAE) measurements have been made on a fractured steel bar. The MAE profile shows a large initial peak and a small final peak, whereas the BE profile contains an initial peak and a large central peak. These observation suggest that, the process of domain nucleation involves the enlargement of residual domains that surround the defects, and is a result of the unpinning of the trapped domain walls. In the maximum held, the residual domains confined by the walls are not completely annihilated due to the strong demagnetizing field surrounding the defects, causing the final BE and MAE peaks to be small. Also, in the low field region of the BE profile, the large central peak indicates that the elongated grains have enhanced the motion of the 180 degrees walls. After the bar has been annealed, we found that (i) the differences in magnitude between the initial and final peaks of both BE and MAE profiles are narrowed because of the fewer defects, and (ii) the overall BE and MAE signals are reduced as a result of the coarsening of ferrite and cementite grains.
著者NG DHL, YU CC, LI ASK
會議名稱33rd Annual Intermag Conference
會議開始日18.04.1995
會議完結日21.04.1995
會議地點SAN ANTONIO
期刊名稱IEEE Transactions on Magnetics
出版年份1995
月份11
日期1
卷號31
期次6
出版社IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
頁次3394 - 3396
國際標準期刊號0018-9464
電子國際標準期刊號1941-0069
語言英式英語
Web of Science 學科類別Engineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Physics; Physics, Applied; PHYSICS, APPLIED

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