Heat treatment method for improving room-temperature ductility of high-silicon electrical steel

A technology of high silicon electrical steel and heat treatment method, which is applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of limited increase in plasticity of high silicon electrical steel and no consideration of residual stress, so as to improve heat treatment efficiency and reduce Small residual tensile stress, cost reduction effect

Active Publication Date: 2013-11-27
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

[0010] Due to the fact that the existing heat treatment methods do not consider the residual stress after heat treatment of the alloy, the precipitated phase, the ordered structure (B2) in the subsequent heat treatment or the process of processing, the transformation to a higher degree of ordered structure (D0 3 ) transformation and other issues, resulting in limited plasticity improvement of high-silicon electrical steel after heat treatment

Method used

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  • Heat treatment method for improving room-temperature ductility of high-silicon electrical steel
  • Heat treatment method for improving room-temperature ductility of high-silicon electrical steel
  • Heat treatment method for improving room-temperature ductility of high-silicon electrical steel

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Effect of heat treatment on bending mechanical properties of columnar high-silicon electrical steel slab at room temperature

[0025] Wire cutting and grinding the directional solidified columnar high-silicon electrical steel (Fe-6.52Si-0.05B) billet into 2×5×35mm 3 The bulk sample was heated to 900°C at 15°C / min, then kept for 1h, and cooled by oil quenching method commonly used in engineering. The samples before and after quenching were subjected to a three-point bending mechanical performance test. The experimental standard was in accordance with GB / T 14452-93. The changes in the measured bending mechanical properties were as follows: figure 2 shown. It can be seen that after quenching, the maximum bending stress of the sample increased by 45%, the fracture deflection increased by 74%, the bending fracture energy increased by 200%, and the plasticity at room temperature was significantly improved.

Embodiment 2

[0026] Example 2: Effect of heat treatment on bending mechanical properties of equiaxed as-cast high-silicon electrical steel at room temperature

[0027] The high-silicon electrical steel (Fe-6.47Si-0.01B) casting slab with equiaxed grain structure prepared by vacuum melting was wire-cut and ground into 2×5×35mm 3 The block sample was heated at 25°C / min to 1100°C and held for 1 hour, then oil quenched (cooling rate 74°C / s), and the cooled sample was annealed at 400°C for 10 minutes to reduce the quenching residue stress. The annealed sample was subjected to a three-point bending mechanical property test. The experimental standard was in accordance with GB / T 14452-93. The measured bending mechanical properties were as follows: image 3 shown. It can be seen that the average fracture deflection of the oil-quenched sample is 1.27mm, which is 95% higher than that of the cast state; the average fracture deflection of the sample after stress relief annealing is 1.53mm, which is...

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Abstract

The invention discloses a heat treatment method for improving room-temperature ductility of high-silicon electrical steel, which is mainly applicable to treating Fe-Si (6.5 percent of Si by weight) high-silicon electrical steel, and belongs to the technical field of metal material heat treatment. A main process flow of the heat treatment method comprises four steps of: heating; preserving heat; cooling; and performing stress relief annealing; and the heat treatment method is particularly characterized by comprising the following steps of: heating a high-silicon electrical steel casting blank to 900-1,200 DEG C at the speed of 15-25 DEG C / minute; preserving heat for 0.25-4 hours at the temperature of 900-1,200 DEG C; cooling to room temperature at the cooling speed of 50-400 DEG C / second; and then reheating to 300-500 DEG C, preserving heat for 0.1-1 hour, then performing air cooling, and performing stress relief annealing, wherein the influences of degree of order, particularly factors such as precipitated phase, residual stress and the like, on the room-temperature ductility of the high-silicon electrical steel are comprehensively considered in the process flow. After the high-silicon electrical steel casting blank is treated by using the method, the room-temperature ductility of the high-silicon electrical steel casting blank is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular provides a heat treatment method for improving room-temperature plasticity of high-silicon electrical steel, which is mainly suitable for treating Fe-6.5wt% Si high-silicon electrical steel. Background technique [0002] Fe-6.5wt%Si electrical steel (high-silicon electrical steel) has the characteristics of high magnetic permeability, low coercive force, and low iron loss. It is the key material for the iron core of high-performance generators, motors, transformers, relays, etc. Significantly reduce the energy loss and noise pollution of devices or equipment, which is conducive to the miniaturization and light weight of equipment or devices [Phway T P P, Moses A J. Magnetostriction trend of non-oriented 6.5%Si-Fe. Journal of Magnetism and Magnetic Materials, 2008, 320(20):e611-e613]. However, high-silicon electrical steel is brittle at room temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D1/30C21D11/00
Inventor 谢建新付华栋王文平张志豪
Owner UNIV OF SCI & TECH BEIJING
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