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Heat treatment method for improving room temperature plasticity of composite prepared high-silicon steel sheet

A heat treatment method and high-silicon steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of difficult to improve the plasticity of 6.5% high-silicon steel, reduce the plasticity, and cannot suppress the B2 ordered structure, so as to prevent the crystal grains Overgrown, reduced order, easy to manipulate effects

Inactive Publication Date: 2018-03-23
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The order transformation in high-silicon steel can be inhibited by appropriate heat treatment process, thereby improving its plasticity; but for 6.5% high-silicon steel, high-temperature quenching heat treatment cannot inhibit the appearance of B2 ordered structure; It is difficult to improve the plasticity of 6.5% high silicon steel by heat treatment
If a certain heat treatment process is carried out on 6.5% high-silicon steel, if the heat treatment process parameters are not selected properly, the B2 structure will change to D0 with a higher degree of order. 3 Structural transformation will further reduce its plasticity

Method used

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  • Heat treatment method for improving room temperature plasticity of composite prepared high-silicon steel sheet
  • Heat treatment method for improving room temperature plasticity of composite prepared high-silicon steel sheet
  • Heat treatment method for improving room temperature plasticity of composite prepared high-silicon steel sheet

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Experimental program
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Effect test

Embodiment 1

[0023] After warm rolling, the high-silicon steel composite plate with a thickness of 0.5mm cladding (normal silicon steel containing 3% silicon) + core layer (ferrosilicon alloy containing 10% silicon) is subjected to diffusion annealing. After the diffusion is uniform, the temperature is reduced to 980°C. Hold for 30 minutes; use cold water for cooling, and then heat to 250°C in a heating furnace for 55 minutes; observe the metallographic structure, compared with the sample without the heat treatment process, the order phase and grain size of the sample after heat treatment are reduced Elevated (e.g. figure 2 , image 3 Shown), the room temperature plasticity is obviously improved.

Embodiment 2

[0025] After warm rolling, the high-silicon steel clad plate with a thickness of 0.42mm cladding (normal silicon steel containing 3% silicon) + core layer (ferrosilicon alloy containing 11% silicon) is subjected to diffusion annealing. After the diffusion is uniform, the temperature is reduced to 950°C. Hold for 30 minutes; use cold water for cooling, then heat to 250°C in a heating furnace for 45 minutes; observe through metallographic structure, compared with the sample without heat treatment process, the order phase and grain size of the sample after heat treatment are reduced Elevated (e.g. Figure 4 , Figure 5 Shown), the room temperature plasticity is obviously improved.

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Abstract

The invention discloses a heat treatment method for improving room temperature plasticity of a composite prepared high silicon steel sheet. The method comprises the three links of heating and heat preservation, rapid cooling and low-temperature tempering. Heat preservation is carried out on a high-silicon steel composite board for 30-120 minutes in a temperature field which is not lower than 950 DEG C by utilizing the waste heat of the high-silicon steel composite board and the environment after the high-silicon steel composite board is subjected to diffusion annealing; the high-silicon steelcomposite board is cooled to the room temperature with the cooling speed of 100-200 DEG C / s by adopting a cooling medium; and the high-silicon steel composite board is heated to 150-250 DEG C again and heat preservation is carried out on the high-silicon steel composite board for 20-50 minutes, and air-cooling is carried out to cool the the high-silicon steel composite board to the room temperature. According to the heat treatment technology, transformation of the ordered phase can be inhibited, the order degree is reduced, and the residual stress is eliminated, so that the room temperature plasticity of the 6.5% high-silicon steel composite board can be remarkably improved.

Description

Technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and relates to a heat treatment method for improving the room temperature plasticity of a composite prepared high-silicon steel sheet, and is mainly suitable for processing a 6.5% high-silicon steel composite board. Background technique [0002] High-silicon steel generally refers to electrical steel with a silicon content of more than 3.5% (mass percentage, the same below), which is an intermediate material for conversion between magnetic energy and electrical energy. With the increase of silicon content, the excellent soft magnetic properties of high silicon steel are more obvious, such as iron loss reduction, magnetostriction coefficient reduction, resistivity and permeability increase, etc., which is very suitable for manufacturing high-speed high-frequency motors, transformers and high-frequency The following magnetic shielding equipment, etc., are indispensable soft mag...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D9/46
CPCC21D1/26C21D9/46
Inventor 姬帅韩静涛雷西虎刘忠军
Owner XI'AN PETROLEUM UNIVERSITY
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