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Acta Metall Sin  2020, Vol. 56 Issue (3): 291-300    DOI: 10.11900/0412.1961.2019.00314
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Effect of Partial Recrystallization Annealing on Magnetic Properties and Mechanical Properties of Non-Oriented Silicon Steel
YU Lei,LUO Haiwen()
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
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With the rapid development of high-speed motors, traditional non-oriented silicon steel is difficult to meet its strength requirements. High strength enables resistance to deformation and fatigue fracture induced by centrifugal force. In this work, Nb element is added to traditional non-oriented silicon steel to improve its strength without greatly sacrificing good magnetism. The previous research on Nb-containing high strength non-oriented silicon steel showed that the annealing at high temperature led to good magnetic properties but poor mechanical properties. In order to improve the strength of the steel, the annealing temperature was decreased to make part of the dislocation structure retained in the cold rolled material. The influences of annealing below 900 ℃ on the microstructures, texture, magnetic and mechanical properties of cold rolled Nb-alloyed non-oriented electrical steel were investigated in this work. The increase of annealing temperature promoted recovery at 700~750 ℃ and led to a partial recrystallization with higher fraction at 800~850 ℃; meanwhile, α texture component was enhanced but γ texture suppressed with the increasing temperature. In contrast, the annealing at 900 ℃ resulted in a complete recrystallization, stronger γ but weaker α texture component. Higher annealing temperature produced lower strength and higher ductility as expected, due to dislocations annihilated by recovery and recrystallization, which also led to lower high-frequency iron loss. The value of magnetic induction B50 corresponds well with the intensity of α texture in the annealed steel, and reaches the maximum value at 850 ℃ due to the most intense α texture formed, at which the best combination of mechanical and magnetic properties is also achieved, including the value of magnetic flux B50 (1.572 T), high-frequency iron loss P1.0/400 (33.26 W/kg) and yield strength about 600 MPa, the latter is attributed to the multiple strengthening mechanisms including dislocation, precipitation and grain refinement strengthening.

Key words:  high strength non-oriented silicon steel      recrystallization      texture      magnetic property      mechanical property     
Received:  25 September 2019     
ZTFLH:  TG142.1  
Corresponding Authors:  Haiwen LUO     E-mail:

Cite this article: 

YU Lei,LUO Haiwen. Effect of Partial Recrystallization Annealing on Magnetic Properties and Mechanical Properties of Non-Oriented Silicon Steel. Acta Metall Sin, 2020, 56(3): 291-300.

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Fig.1  OM images on the microstructures of Nb-containing non-oriented silicon steel after annealing at different temperatures for 240 s (ND—normal direction, RD—rolling direction)(a) 700 ℃ (b) 750 ℃ (c) 800 ℃ (d) 850 ℃ (e) 900 ℃
Fig.2  EBSD image quality mapping with boundaries (a~c) and orientation mapping (d~f) on the Nb-containing non-oriented silicon steel after annealing at 750 ℃ (a, d), 800 ℃ (b, e) and 900 ℃ (c, f) (The red and green lines represent low and high angle boundaries with the misorientations between 2° and 15°, and more than 15°, respectively)Color online
Fig.3  Evolution of Nb-rich particles in Nb-containing non-oriented silicon steel after cold-rolling and annealing at different temperatures for 240 s(a) cold-rolled state (b) 700 ℃ (c) 750 ℃ (d) 800 ℃ (e) 850 ℃(f~h) 900 ℃ (g) TEM bright field image (h) SAED pattern
T / ℃X / nmf / %σPS / MPa
Table 1  Measured sizes, volume fractions and the increments of precipitation strengthening of Nb-rich particles in Nb-containing non-oriented silicon steel after different annealing temperatures
Fig.4  SEM images (a, b) and EPMA maps of Nb distributions (c, d) of Nb-containing non-oriented silicon steel after annealing at 700 ℃ (a, c) and 900 ℃ (b, d)Color online
Fig.5  Orientation distribution function (ODF) section images at φ2=45° on textures in Nb-containing non-oriented silicon steel after cold rolling and annealing at different temperatures for 240 s (φ1, φ2 and Φ are Euler angles)Color online(a) cold-rolled state (b) 700 ℃ (c) 750 ℃ (d) 800 ℃ (e) 850 ℃ (f) 900 ℃
Fig.6  α-fiber (a) and γ-fiber (b) texture components in Nb-containing non-oriented silicon steel after cold rolling and the different annealing processes (f(g)—orientation distribution function, g= (φ1, Φ, φ2))
Fig.7  Iron losses of power frequency (P1.5/50) and high frequency (P1.0/400), magnetic induction intensity (B50) (a) and mechanical properties (b) in Nb-containing non-oriented silicon steel after the different annealing processes (ReL—yield strength, Rm—tensile strength, A—elongation)
Fig.8  The relationships of the intensity of α texture and the magnetic induction
Fig.9  Contributions from several strengthening mechanisms to yield strength of Nb-containing non-oriented silicon steel after annealing at different temperatures
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