Fe-Co Alloy Bar Microstructure for Strength and Magnetic Balance
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Solution Overview
Problem
Conventional manufacturing methods for Fe—Co-based alloy bars fail to achieve both high strength and favorable magnetic properties, particularly in smaller products such as solenoid valves.
Innovation Solution
The Fe—Co-based alloy bar is produced with 30% to 80% crystal grains having a grain orientation spread (GOS) value of 0.5° or more and an average crystal grain size of 8.5 to 12.0, incorporating elements like V, Si, Mn, Al, Zr, B, Ni, Ta, Nb, W, Ti, Mo, and Cr to enhance processability and magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hot-processing method is used to manufacture Fe—Co-based alloy bar, then manufacturing process is simple, but both high strength and favorable magnetic properties cannot be achieved simultaneously
Solution Approach 1:
The patent applies parameter changes by precisely controlling crystal grain size (average 8.5 to 12.0) and grain orientation spread (30% to 80% of grains with GOS ≥0.5°). This dual parameter control transforms the material's microstructure to simultaneously achieve high strength through grain boundary strengthening and favorable magnetic properties through controlled crystallographic orientation, resolving the contradiction between mechanical strength and magnetic performance in Fe—Co-based alloy bars
Solution Approach 2:
The patent creates a composite microstructure within the Fe—Co-based alloy by combining grains with different orientation characteristics. The specific distribution of grain orientations (30%-80% with GOS ≥0.5°) creates a heterogeneous microstructure that provides both the strength from grain boundary effects and the magnetic properties from favorably oriented grains, effectively combining multiple benefits in a single material system
2Productivity
If product size is reduced for higher performance applications, then product performance improves, but achieving both strength and magnetic properties becomes more difficult
Solution Approach 1:
The patent maintains the ability to achieve high strength and magnetic properties in reduced product sizes by controlling intrinsic microstructural parameters (grain size 8.5-12.0 and grain orientation distribution) rather than relying on product dimensions. This allows the material to retain its mechanical and magnetic performance characteristics regardless of the overall product size, enabling miniaturization without performance loss
Data Source
AI summary
Along with higher performance of products, materials are also required to achieve both a high strength and favorable magnetic properties according to applications of products. Therefore, the present invention provides an Fe—Co-based alloy bar which enables both a high strength and favorable magnetic properties to be achieved.An Fe—Co-based alloy bar contains 30% to 80% of crystal grains having a grain orientation spread (GOS) value of 0.5° or more in terms of an area ratio, and having an average crystal grain size number of more than 8.5 and 12.0 or less. The Fe—Co-based alloy bar of the present invention has a high 0.2% yield strength after magnetic annealing so that it can support various high-strength applications.