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Method for refining metal structure in oxide metallurgy by utilizing pulsed magnet field

A technology of pulsed magnetic field and metal structure, which is applied in the field of metal solidification and fine grain, can solve the problems of enhanced grain coarsening and alloy grain size increase, so as to reduce microporosity, expand equiaxed grain proportion, and refine The effect of organizational structure

Inactive Publication Date: 2013-10-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

But at the same time, the grain coarsening effect caused by the cooling rate reduction will also be enhanced. When the grain coarsening effect caused by the cooling rate reduction is greater than the grain refinement effect caused by the pulsed magnetic field, the alloy grain size will increase.

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  • Method for refining metal structure in oxide metallurgy by utilizing pulsed magnet field
  • Method for refining metal structure in oxide metallurgy by utilizing pulsed magnet field
  • Method for refining metal structure in oxide metallurgy by utilizing pulsed magnet field

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[0028] The present invention will be further described below in conjunction with the examples, and the purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0029] In this embodiment, the metal material is 45# steel; the composite alloy elements that induce intragranular ferrite are Ti-O-V-N series alloys. The following are the method steps for refining the metal structure by oxide metallurgy using a pulsed magnetic field:

[0030] a. Heat and melt 45# steel in a resistance furnace, the maximum heating temperature is 1600°C, the superheating degree is 150°C, and the temperature is kept for 10 minutes;

[0031]b. Add Ti-O-V-N series alloys into molten 45# molten steel to adjust the chemical composition of 45# molten steel to: C 0.42, Si 0.36, Mn 0.23, S 0.043, P 0.017, Ti 0.013, V 0.09, N 0.014 ;

[0032] c. Apply a pulsed magnetic field with a magnetic induction ...

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Abstract

The invention relates to a method for refining metal structure in oxide metallurgy by utilizing a pulsed magnet field, and belongs to a metal solidification and crystallization technology. The method comprises the following steps of: fusing a metal material, wherein the degree of superheat is 100-150 DEG C, and insulating for 5-15 minutes; adding compound alloy elements which induce transgranular ferrite into the metal liquid, wherein the metal liquid comprises the following chemical components: 0.25-0.6% of C, 0.1-0.4% of Si, 0.5-1.5% of Mn, less than or equal to 0.045% of S, less than or equal to 0.045% of P, 0-0.05% of Ti, 0-0.1% of V and 0-0.01% of N; applying the pulsed magnet field to the metal liquid, wherein the magnetic induction intensity is 0-5T, and the pulse period is 0-30s; cooling and condensing the metal liquid to room temperature at a cooling speed of 50-150 DEG C / min. The method provided by the invention organically combines treatment of the pulsed magnet field and oxide metallurgy, so that grains and tissues in the steel liquid are double-refined in the whole condensing process, thereby, optimizing the performance of the steel material.

Description

technical field [0001] The invention relates to a method for refining metal structure through oxide metallurgy by using a pulsed magnetic field, which belongs to the metal solidification and fine-grain technology. Background technique [0002] Under modern technology, fine-grain strengthening through oxide metallurgy technology and electromagnetic treatment technology are two important research directions. In recent years, the basic research of the above two technologies has made great progress, but the characteristics and mechanism of grain refinement in the oxide metallurgy process under the control of magnetic field have not yet been studied. According to the analysis, the above-mentioned dual fine-graining processes not only act on different stages of the solidification process, but also are mutually independent and promote each other. Applying the pulsed magnetic field non-contact to the oxide metallurgy process can effectively refine the grains in the solidificati...

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Application Information

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IPC IPC(8): B22D27/02B22D27/20
Inventor 朱立光张庆军莫文玲崔志敏严春亮梅国宏
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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