Method for improving warm deformation plasticity of high silicon steel sheet by adding heavy rare earth yttrium element

Abstract

The invention belongs to the technical field of metal material preparation, and discloses a method for improving the warm deformation plasticity of a high silicon steel sheet by adding a heavy rare earth yttrium element. The product is prepared from the chemical composition in percentage by mass: 6.0%-6.6% of Si, 0.005%-0.03% of Y, less than or equal to 0.004% of C, less than or equal to 0.003% ofS, less than or equal to 0.005% of O, less than or equal to 0.005% of N, less than or equal to 0.008% of P and the balance of Fe. After adding 0.005%-0.03% of yttrium element to high silicon steel, the tensile elongation at break of a forged slab is increased from 0.8% to 2.3% at 200 DEG C, is increased from 1.8% to 6.1% at 400 DEG C, and is increased from 2.5% to 45% at 600 DEG C; and the tensile strength is further significantly improved. According to the method for improving the warm deformation plasticity of the high silicon steel sheet by adding the heavy rare earth yttrium element, a trace amount of heavy rare earth yttrium element is added in the high silicon steel, a role of deep purification is played, grain refining and microalloying are achieved, the formation of an ordered phase of the high silicon steel is reduced, and the warm deformation plasticity of the high silicon steel is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a method for improving the temperature deformation plasticity of high silicon steel slabs by adding heavy rare earth yttrium element. Background technique [0002] At present, the commonly used prior art in the industry is as follows: high-silicon steel generally refers to Si-Fe alloy containing 4.5%-6.7% Si by mass fraction, and the general-purpose high-silicon steel is 6.5% Si-Fe. The resistivity of 6.5% Si high-silicon steel is ρ=82μΩ·cm, which is about twice as high as that of 3% Si silicon steel (3%Si silicon steel ρ=48μΩ·cm), and the saturation magnetic induction is B s =1.80T, lower than 3% Si silicon steel (3% Si silicon steel B s =2.03T), magnetostriction coefficient λ s is approximately zero, the magnetic anisotropy constant K 1 About 40% lower than 3% Si silicon steel. The magnetic characteristics of high-silicon steel are that the ir...

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Problems solved by technology

[0007] To sum up, the problem existing in the prior art is that the rare earth elements added by scholars at home and abroad only use Ce and La, both of which belong to the light rare earth elements, while the heavy rare earth yttrium (Y) element in the electrical steel Application not yet reported

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