Secondary recrystallization behavior and magnetic properties of grain oriented 2.2% Si‐1.5% Mn steel

1993 ◽  
Vol 73 (10) ◽  
pp. 6606-6608 ◽  
Author(s):  
H. Yashiki ◽  
T. Kaneko
Keyword(s):  
Magnetic Properties ◽  
Secondary Recrystallization ◽  
Recrystallization Behavior ◽  
Mn Steel

scholarly journals Improving the Magnetic Properties of Non-Oriented Electrical Steels by Secondary Recrystallization Using Dynamic Heating Conditions

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1914 ◽  
Author(s):  
Ivan Petryshynets ◽  
František Kováč ◽  
Branislav Petrov ◽  
Ladislav Falat ◽  
Viktor Puchý
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Boundary Migration ◽  
Cold Work ◽  
Secondary Recrystallization ◽  
Coarse Grained ◽  
High Heating Rate ◽  
Electrical Steels ◽  
Heat Treated ◽  
Dynamic Heating

In the present work, we have used unconventional short-term secondary recrystallization heat treatment employing extraordinary high heating rate to develop coarse-grained microstructure with enhanced intensity of rotating cube texture {100}<011> in semi-finish vacuum degassed non-oriented electrical steels. The soft magnetic properties were improved through the increase of grains size with favourable cube crystallographic orientation. The appropriate final textural state of the treated experimental steels was achieved by strain-induced grain boundary migration mechanism, activated by gradient of accumulated stored deformation energy between neighbouring grains after the application of soft cold work, combined with steep temperature gradient during subsequent heat treatment under dynamic heating conditions. The materials in our experimentally prepared material states were mounted on the stator and rotor segments of electrical motors and examined for their efficiency in real operational conditions. Moreover, conventionally long-term heat treated materials, prepared in industrial conditions, were also tested for reference. The results show that the electrical motor containing the segments treated by our innovative approach, exhibits more than 1.2% higher efficiency, compared to the motor containing conventionally heat treated materials. The obtained efficiency enhancement can be directly related to the improved microstructural and textural characteristics of our unconventionally heat treated materials, specifically the homogenous coarse grained microstructure and the high intensity of cube and Goss crystallographic texture.

scholarly journals Secondary Recrystallization Behavior in Fe-3%Si Grain-oriented Silicon Steel Produced by Twin-roll Casting and Simplified Secondary Annealing

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 660
Author(s):  
Yang Wang ◽  
Yuanxiang Zhang ◽  
Feng Fang ◽  
Xiang Lu ◽  
Guo Yuan ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Secondary Recrystallization ◽  
Laser Scanning Microscopy ◽  
Processing Route ◽  
Confocal Laser ◽  
Continuous Annealing ◽  
Pinning Force ◽  
Recrystallization Behavior ◽  
Twin Roll ◽  
Secondary Annealing

Grain-oriented silicon steels were produced by the shortest processing route involving twin-roll strip casting, two-stage cold rolling with intermediate annealing, and simulated continuous annealing. The secondary recrystallization behavior of grain-oriented silicon steels under different inhibition conditions was in-situ observed by combining the confocal laser scanning microscopy (CLSM) and electron backscattered diffraction (EBSD) techniques. The results revealed that the optimal temperature of secondary recrystallization showed a proportional relationship with the Zenner pinning force. In the case of weak pinning force, the abnormal grain growth occurred quickly at ~1050 °C. The corresponding growth rates were in the range of 60–1400 μm/min and decreased gradually as the secondary recrystallization proceeded. In the case of strong pinning force, the incubation time and onset temperature of the secondary recrystallization was significantly increased, but the total time of the secondary recrystallization was obviously shortened from 685 s to 479 s, and the final magnetic induction of B8 was increased from 1.7 T to 1.85 T. After the secondary annealing, some island grains and coarse primary grains were retained. The formation of island grain was related to the low migration of grain boundaries. The findings of coarse γ- grains indicated that the primary grain size also played a crucial role during secondary recrystallization, apart from the primary recrystallized texture, which attracted more attention previously.

Orientation of Island and Small Grains in Grain Oriented Electrical Steels

2013 ◽  
Vol 753 ◽  
pp. 530-533
Author(s):  
Jong Tae Park ◽  
Hyun Seok Ko ◽  
Hyung Don Joo ◽  
Dae Hyun Song ◽  
Kyung Jun Ko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Grain Boundary ◽  
Magnetic Flux ◽  
Core Loss ◽  
Secondary Recrystallization ◽  
Magnetic Flux Density ◽  
Recrystallization Annealing ◽  
Goss Texture ◽  
Electrical Steels ◽  
Small Grains

Grain oriented electrical steels should have low core loss and high magnetic flux density. These properties are closely related with sharpness of {110} texture after secondary recrystallization. This Goss texture develops by abnormal grain growth during secondary recrystallization annealing. Based on experimental results, a general suggestion which estimates the magnetic properties after secondary recrystallization from a primary recrystallized texture can be made. For a material to have better magnetic properties after secondary recrystallization, its primary recrystallized texture should have not only larger number of ideal Goss grains, but also lower frequency of low angle grain boundary around those Goss grains.

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