Grain-Oriented Steel Sheet Texture Optimization
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Solution Overview
Problem
Grain-oriented electrical steel sheets face limitations in improving core loss characteristics due to the difficulty in evaluating and optimizing the alignment of secondary recrystallized grains, particularly with the {110} orientation, as existing methods only consider deviation angles around the rolling surface normal and traverse directions, neglecting the impact of the deviation angle around the rolling direction.
Innovation Solution
Incorporating the evaluation of deviation angles α, β, and γ around the rolling surface normal, traverse, and rolling directions to assess the alignment of secondary recrystallized grains, with a focus on adjusting the deviation angle γ based on α and β to enhance core loss characteristics, and controlling the texture after primary recrystallization to achieve optimal orientation distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the {110} orientation alignment of secondary recrystallized grains is improved by reducing deviation angles α and β, then magnetic properties are enhanced, but core loss characteristic deteriorates when alignment becomes too high
Solution Approach 1:
The invention changes the evaluation parameters from only α and β to include γ, and establishes a new quantitative relationship γ ≥ (α² + β²)^(1/2)/2. This parameter change allows optimization of the orientation distribution to achieve better core loss characteristics while maintaining magnetic properties.
Solution Approach 2:
The invention adds a new dimension (γ angle around rolling direction) to the traditional two-dimensional evaluation system (α and β angles). This three-dimensional orientation evaluation enables more comprehensive control of grain alignment and resolves the contradiction between magnetic properties and core loss.
2Device complexity
If only deviation angles α and β around rolling surface normal and traverse directions are considered, then evaluation is simplified, but the impact of deviation angle γ around rolling direction is neglected
Solution Approach 1:
The invention transitions from a two-dimensional evaluation system (α, β) to a three-dimensional system by incorporating γ. This adds completeness to the orientation evaluation without significantly increasing complexity, as the new parameter γ can be measured using standard texture analysis methods.
Solution Approach 2:
The invention replaces qualitative assessment of orientation alignment with a quantitative mathematical relationship γ ≥ (α² + β²)^(1/2)/2. This substitution enables precise evaluation and optimization of orientation distribution based on measurable parameters.
3Manufacturing precision
If the axes of individual crystal grains are made to match the rolling direction, then orientation alignment is improved, but it becomes difficult to achieve due to dispersion around ND and TD
Solution Approach 1:
The invention changes the manufacturing target from achieving perfect alignment (α=0, β=0, γ=0) to achieving a quantitative relationship γ ≥ (α² + β²)^(1/2)/2. This parameter change makes the manufacturing target more realistic and achievable while still obtaining excellent magnetic properties and low core loss.
Solution Approach 2:
The invention accepts partial alignment (allowing dispersion around ND and TD) but compensates by controlling γ to satisfy the quantitative relationship. This partial action approach is more easily achieved in practice while still achieving the desired performance.
Data Source
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Figure 3(a)~3(b)
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AI summary
Grain-oriented electrical steel sheet superior in core loss characteristic containing Si: 0.8 to 7 mass% and having a secondary recrystallized texture with a {110}<001> orientation as the main orientation, characterized in that average deviation angles α, β, and γ from the {110}<001> ideal orientation of the secondary recrystallized texture satisfy (α2+β2)1/2≤γ, where α: average deviation angle from {110}<001> ideal orientation around rolling surface normal direction (ND) of secondary recrystallized texture, β: average deviation angle from {110}<001> ideal orientation around traverse direction (TD) of secondary recrystallized texture, and γ: average deviation angle from {110}<001> ideal orientation around rolling direction (RD) of secondary recrystallized texture.