Graduate Institute ofFerrous Technology



[ATL] Prof. Yang Mo Koo: Effect of Al content on Magnetic Domains of {100} Grains in Electrical Steels
GIFT 18-10-31 17:42

Magnetic domains of {100} grains in electrical steels with 1.85 ≤ Al ≤ 6.54 wt. % were observed by magneto-optic Kerr microscopy. The characteristics and motion of magnetic domains were correlated with hysteresis loss, anomalous loss and permeability. As Al contents increased, domain wall energy decreased, so the magnetic domain size of {100} grains decreased. In steel with Al 6.54 wt. %, 90° domain walls appeared, so the complexity of domain structures increased. Addition of Al caused increase in hysteresis loss. Anomalous loss decreased until Al 4.68 wt. %, then saturated, despite high resistivity and small domain size. External magnetizing force  required to induce maximum permeability µmax increased drastically at Al 6.54 wt. %. These changes of magnetic properties may be caused by pinning of 90° walls during magnetization. As domain size decreased to form closure domains, the complexity of reorganization of magnetic domains increased, and they were interrupted by pinning 90° walls.

Keywords: Magnetic domain structure; Al addition; Core loss; Rearrangement of domains

1-s2.0-S0304885317334601-main.pdf 3회 (3.0M) 2018-10-31 17:42:34

23 ea 1 page

[CTL] Prof. Jung-Wook Cho: oxide metallurgy during AM

 In laser metal deposition (LMD) process, meltpool oxidation is inevitable due to high working temperature, which results in finely dispersed non-metallic inclusions in the steel matrix. In this paper, cha…

GIFT | 09-30 Time

2013 Acta Student Award winner, Dr. Jae Hoon Jang

​​​Dr. Jae Hoon Jang, former Ph.D. student in CML, wins the Acta Student Award in this year. This award is given to the person who has made a major contribution to the paper in Acta journal, which demonstrate…

GIFT | 07-31 Time

The NIMS Award 2012 to Prof. Bhadeshia

​Prof. Harry Bhadeshia, the Director of CML was awarded the 2012 NIMS award for distinguished achievements in research and development of structural materials and invaluable contributions to NIMS (National Ins…

GIFT | 06-14 Time