Fe-Co Alloy Bar Grain Orientation for Stable Magnetic Properties
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Solution Overview
Problem
Existing Fe—Co-based alloy bars do not reliably achieve the level of magnetic properties required for advanced applications due to insufficient crystal grain orientation and size distribution.
Innovation Solution
The Fe—Co-based alloy bar is formulated to have an area ratio of crystal grains with a grain orientation spread (GOS) value of 0.5° or more exceeding 80%, with a difference in area ratios between cross sections within 10%, and an average crystal grain size of 6.0 to 8.5, enhancing magnetic properties through controlled processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hot-rolling processing is used to manufacture Fe-Co-based alloy bars, then production efficiency is maintained, but magnetic properties are insufficient due to poor crystal grain orientation
Solution Approach 1:
The patent applies preliminary action by performing specific hot-rolling processing conditions before final product completion. The alloy is hot-rolled at 950-1100°C with controlled reduction ratios (total reduction 60-80%, with intermediate annealing) to pre-establish the desired crystal grain orientation and structure before final product formation, ensuring excellent magnetic properties are achieved during subsequent processing
Solution Approach 2:
The patent applies parameter changes by optimizing specific processing parameters: hot-rolling temperature (950-1100°C), reduction ratio (60-80% total), and intermediate annealing conditions. These parameter adjustments transform the crystal grain structure to achieve the required orientation and size distribution, directly improving magnetic properties while maintaining manufacturing feasibility
2Reliability
If crystal grain size is reduced to improve magnetic properties, then magnetic permeability increases, but manufacturing complexity increases due to tighter process control requirements
Solution Approach 1:
The patent controls average crystal grain size at 6.0-8.5 by optimizing hot-rolling temperature (950-1100°C) and reduction ratio (60-80%), followed by controlled cooling. This parameter optimization achieves the target grain size range that ensures excellent magnetic permeability while maintaining manageable process control requirements through well-defined processing windows
3Reliability
If uniform crystal grain distribution is achieved to ensure consistent magnetic properties across the bar, then magnetic property reliability improves, but manufacturing time increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by implementing intermediate annealing during the hot-rolling process. After initial hot-rolling, the alloy undergoes annealing at 700-900°C for 0.5-2 hours, then continues with remaining hot-rolling passes. This intermediate treatment pre-establishes uniform crystal grain distribution throughout the material, ensuring consistent magnetic properties across the entire bar while completing the process within efficient timeframes
Solution Approach 2:
The patent applies periodic action through intermediate annealing cycles during continuous hot-rolling. The process alternates between hot-rolling passes and annealing treatments, creating periodic thermal-mechanical cycles that progressively refine crystal grain structure and ensure uniform distribution throughout the alloy bar, achieving both consistency and manufacturing efficiency
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 results in an Fe—Co-based alloy bar with superior magnetic properties, including higher magnetic permeability and lower coercive force, ensuring consistent performance across different cross-sectional orientations.
Implementation Method 1
an area ratio of crystal grains having a grain orientation spread (GOS) value of 0.5° or more exceeds 80%
Data Source
AI summary
The present invention provides an Fe—Co-based alloy bar which enables excellent magnetic properties to be reliably obtained. In the Fe—Co-based alloy bar, an area ratio of crystal grains having a grain orientation spread (GOS) value of 0.5° or more exceeds 80%, and the difference between an area ratio of crystal grains having a GOS value of 0.5° or more observed in a cross section in a direction perpendicular to an axis of the bar and an area ratio of crystal grains having a GOS value of 0.5° or more observed in a cross section in an axial direction of the bar is within 10%. Preferably, the average crystal grain size number is 6.0 or more and 8.5 or less.