Double-Oriented Electrical Steel Sheet With Balanced Magnetic Anisotropy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrical steel sheets exhibit significant magnetism deviation between the rolling direction and the rolling vertical direction, limiting their magnetic properties, and industrial production methods like cross rolling are impractical for large-scale manufacturing of Cube orientation textures.
Innovation Solution
A double-oriented electrical steel sheet is manufactured by adjusting the reduction ratio and final annealing time in secondary cold rolling to enhance the fraction of crystal grains with {100} orientation, achieving a balance in magnetic properties between the rolling directions, with specific compositions and manufacturing processes including hot-rolling, primary and secondary cold-rolling, intermediate annealing, and final annealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cross rolling method is used to manufacture Cube orientation texture, then magnetic properties in rolling direction and rolling vertical direction can be improved, but productivity becomes extremely low and continuous production is impossible
Solution Approach 1:
The invention changes the processing parameters by using secondary cold rolling with specific reduction ratios (40-80%) followed by controlled annealing at 550-750°C for 5-20 seconds. This parameter change enables the formation of Cube orientation texture ({100} <001>) through a continuous production process, resolving the contradiction between achieving good magnetic properties and maintaining high productivity
Solution Approach 2:
The invention replaces the mechanical cross rolling process with a thermal-mechanical process combining secondary cold rolling and controlled annealing. This substitution eliminates the need for complex cross rolling operations while achieving the desired Cube orientation texture through phase transformation and recrystallization during annealing, thereby enabling continuous production
2Reliability
If oriented electrical steel sheet with Goss texture is used, then magnetic properties in one direction are improved, but magnetic properties in other directions remain limited due to magnetic anisotropy
Solution Approach 1:
The invention creates local quality changes by developing Cube orientation texture ({100} <001>) which provides easy magnetization axes in multiple directions compared to the single-direction Goss texture. This allows the material to exhibit excellent magnetic properties in both rolling direction and rolling vertical direction, enhancing adaptability while maintaining high magnetic performance
Solution Approach 2:
The invention breaks the magnetic anisotropy limitation of Goss texture by introducing Cube orientation which has symmetric easy magnetization characteristics in multiple crystallographic directions. This asymmetric change in texture type enables the steel sheet to achieve uniform excellent magnetic properties in all directions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The steel sheet achieves high magnetic flux density and low iron loss with minimal magnetism deviation between directions, ensuring excellent magnetic properties in both rolling directions through controlled crystal grain orientations.
Implementation Method 1
The oriented electrical steel sheet uses a secondary recrystallization phenomenon
Implementation Method 2
manufacturing a hot-rolled sheet by hot-rolling a slab; manufacturing a primary cold-rolled sheet by primarily cold-rolling the hot-rolled sheet
Data Source
AI summary
In a double-oriented electrical steel sheet according to an embodiment of the present invention, the fraction of crystal grains having an orientation within 15° from {100} <001> is 50 to 75%, and the fraction of crystal grains having an orientation within 15° from {100}<380> is 50 to 75%.