Title

Characterization of High Silicon Steel Produced by a Thermomechanical Route

Characterization of High Silicon Steel Produced by a Thermomechanical Route

Authorship

YÁÑEZ, T. ROS; HOUBAERT, Y.

YÁÑEZ, T. ROS

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HOUBAERT, Y.

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DOI

10.5151/2594-5327-C01241

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Abstract

Alloys with 4.5 and 6.3%Si were cast, hot and cold rolled using an adequate scheme. A final thickness of 1mm after hot rolling and of 0.5 mm after cold rolling was obtained. After hot rolling a heterogeneous microstructure is observed over the sheet thickness: shear bands in the surface and a central zone with elongated grains. The recrystallization is strongly retarded at lower temperature and specifically in the high-Si steel because of ordering. The microstructure of the cold rolled material is similar to the hot rolled microstructure, due to the lack of recrystallization. The texture of the hot rolled material is heterogeneous with a γ-fibre in the centre and a Goss-texture near the surfaces, which is more pronounced for the higher Si-content. Annealing at 800°C (below the ordering temperature) modifies the texture, the Goss-texture being partially replaced by a cube texture. Annealing at 1150°C completely recrystallizes the material and the texture gradient disappears. Cold rolling (whenever possible) without intermediate annealing produces a strong <001>//ND texture with {111}<110> orientation for the large grains in the centre. After annealing for 2 hours at 900°C secondary recrystallization is observed and texture is weakened.

Alloys with 4.5 and 6.3%Si were cast, hot and cold rolled using an adequate scheme. A final thickness of 1mm after hot rolling and of 0.5 mm after cold rolling was obtained. After hot rolling a heterogeneous microstructure is observed over the sheet thickness: shear bands in the surface and a central zone with elongated grains. The recrystallization is strongly retarded at lower temperature and specifically in the high-Si steel because of ordering. The microstructure of the cold rolled material is similar to the hot rolled microstructure, due to the lack of recrystallization. The texture of the hot rolled material is heterogeneous with a γ-fibre in the centre and a Goss-texture near the surfaces, which is more pronounced for the higher Si-content. Annealing at 800°C (below the ordering temperature) modifies the texture, the Goss-texture being partially replaced by a cube texture. Annealing at 1150°C completely recrystallizes the material and the texture gradient disappears. Cold rolling (whenever possible) without intermediate annealing produces a strong <001>//ND texture with {111}<110> orientation for the large grains in the centre. After annealing for 2 hours at 900°C secondary recrystallization is observed and texture is weakened.

Keywords

soft magnetic materials, high silicon electrical steel, texture analysis

soft magnetic materials, high silicon electrical steel, texture analysis