Soft Magnetic Alloy Strip Continuous Annealing
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Solution Overview
Problem
Current methods for manufacturing soft magnetic alloys, such as those used in electro-technical equipment, face challenges in achieving high elastic limits while maintaining good magnetic properties, requiring multiple alloy changes, complex heat treatments, and difficulties in achieving specific mechanical and magnetic performance compromises.
Innovation Solution
A method for manufacturing a thin strip of soft magnetic alloy with a specific chemical composition that allows for easy mechanical cutting and subsequent heat treatment to achieve both high elasticity and magnetic performance, involving hot rolling, cold rolling, and continuous annealing at controlled temperatures with rapid cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static annealing is used to optimize magnetic properties, then magnetic performance is improved, but production time increases significantly (several hours)
Solution Approach 1:
The patent applies preliminary action by performing a restoration heat treatment before cold rolling to reduce brittleness and improve ductility. This preliminary treatment allows the material to be more readily formed in subsequent operations, reducing the need for extensive post-processing annealing and thereby reducing total production time while maintaining magnetic performance
Solution Approach 2:
The patent changes the heat treatment parameters by using a restoration treatment at specific temperature ranges (850-950°C) followed by controlled cooling, rather than traditional long-duration static annealing. This parameter change enables achieving the desired magnetic properties and ductility in a more efficient process, reducing production time from several hours to a more manageable duration
2Manufacturing precision
If cold rolling is performed to reduce strip thickness, then dimensional precision is improved, but material brittleness increases making cutting difficult
Solution Approach 1:
The patent applies preliminary action by performing a restoration heat treatment before cold rolling to reduce brittleness and improve ductility. This preliminary treatment allows the material to be more readily formed in subsequent operations, reducing the need for extensive post-processing annealing and thereby reducing total production time while maintaining magnetic performance
Solution Approach 2:
The patent changes the heat treatment parameters by using a restoration treatment at specific temperature ranges (850-950°C) followed by controlled cooling, rather than traditional long-duration static annealing. This parameter change enables achieving the desired magnetic properties and ductility in a more efficient process, reducing production time from several hours to a more manageable duration
3Strength
If alloy composition is modified to increase elasticity limit, then mechanical strength is improved, but magnetic properties deteriorate
Solution Approach 1:
The patent changes the heat treatment parameters by using a restoration treatment at specific temperature ranges (850-950°C) followed by controlled cooling, rather than traditional long-duration static annealing. This parameter change enables achieving the desired magnetic properties and ductility in a more efficient process, reducing production time from several hours to a more manageable duration
Solution Approach 2:
The patent employs composite material principles by combining Fe-Co alloy with specific additions of V (1-3%), Nb (0.01-0.5%), and B (0.003-0.05%) to create a multi-phase microstructure. This composite approach allows simultaneous achievement of high elasticity limit (600-1200 MPa) and good magnetic properties through the synergistic effect of different phases and precipitates
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 method enables the production of strips with adjustable mechanical strength and magnetic properties, allowing for the manufacture of parts with high elasticity limits and reduced magnetic losses, simplifying the production process and reducing the need for multiple alloy grades and heat treatments.
Implementation Method 1
a) having the strip pass into a continuous annealing oven, at a temperature comprised between the order/disorder transition temperature of the alloy and the ferritic/austenitic transformation point of the alloy
Implementation Method 2
followed by rapid cooling down to a temperature of less than 200° C.
Implementation Method 3
at a temperature comprised between the order/disorder transition temperature of the alloy and the ferritic/austenitic transformation point of the alloy
Implementation Method 4
at a temperature comprised between the order/disorder transition temperature of the alloy and the ferritic/austenitic transformation point of the alloy
Data Source
AI summary
Method for manufacturing a thin strip in a soft magnetic alloy and strip obtained A method for manufacturing a strip in a soft magnetic alloy capable of being cut out mechanically, the chemical composition of which comprises by weight:18% ≤ Co ≤ 55%0% ≤ V + W ≤ 3%0% ≤ Cr ≤ 3%0% ≤ Si ≤ 3%0% ≤ Nb ≤ 0.5%0% ≤ B ≤ 0.05%0% ≤ C ≤ 0.1%0% ≤ Zr + Ta ≤ 0.5%0% ≤ Ni ≤ 5%0% ≤ Mn ≤ 2%The remainder being iron and impurities resulting from the elaboration, according to which a strip obtained by hot rolling is cold-rolled in order to obtain a cold-rolled strip with a thickness of less than 0.6 mm.After cold rolling, a continuous annealing treatment is carried out by passing into a continuous oven, at a temperature comprised between the order/disorder transition temperature of the alloy and the onset temperature of ferritic/austenitic transformation of the alloy, followed by rapid cooling down to a temperature below 200° C. Strip obtained.