Electrical Steel Sheet Texture Control for Stable Iron Loss After Shearing
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Solution Overview
Problem
Non-oriented electrical steel sheets experience fluctuations in magnetic characteristics, particularly iron loss, after shearing due to rough cross-sections and fracture behaviors during processing, which affect the crystal structure and orientation.
Innovation Solution
A non-oriented electrical steel sheet with specific chemical compositions and controlled crystal orientations, where {100} orientated grains are preferentially grown through strain-induced boundary migration, and the areas and area ratios of {100} and {111} orientated grains are optimized on the steel sheet surface to maintain excellent magnetic characteristics post-shearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strain-induced boundary migration is utilized to control texture, then magnetic characteristics are improved, but characteristics fluctuate after shearing
Solution Approach 1:
The invention changes the crystallographic orientation parameters by controlling the area ratio of {100} orientated grains to be 0.75 or more, which fundamentally alters the texture characteristics to improve magnetic properties while enhancing stability after shearing operations
Solution Approach 2:
The invention performs preliminary texture control during manufacturing by utilizing strain-induced boundary migration to establish the desired {100} orientation distribution before shearing, thereby pre-preventing characteristic fluctuations that would otherwise occur during subsequent processing
2Reliability
If {100} orientation is controlled to improve magnetic flux density, then magnetic characteristics are improved, but iron loss increases due to fracture behaviors during shearing
Solution Approach 1:
The invention optimizes the area ratio parameter of {100} orientated grains to be 0.75 or more, which simultaneously improves magnetic flux density while reducing iron loss by creating a more stable texture that resists fracture-induced degradation during shearing operations
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 solution ensures that the non-oriented electrical steel sheet maintains excellent magnetic characteristics, including low iron loss, by controlling the crystal structure and grain sizes, thereby stabilizing the magnetic properties even after shearing.
Implementation Method 1
it was recognized that, in non-oriented electrical steel sheets for which strain-induced boundary migration has been utilized
Implementation Method 2
performing a heat treatment on the non-oriented electrical steel sheet at a temperature of 700° C. to 950° C. for 1 second to 100 seconds
Data Source
AI summary
This non-oriented electrical steel sheet has a predetermined chemical composition, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {100} orientated grains is indicated by S100, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {100} orientated grains is indicated by K100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20≤Styl/Stot≤0.85, 0.05≤S100/Stot≤0.80, S100/Stot≥0.5, and K100/Ktyl≤0.990 are satisfied.