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Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency

A pulsed magnetic field and pulsed current technology, applied in the field of metal solidification control, can solve the problems of poor refinement effect, high external field energy consumption, uneven solidification structure, etc., and achieve the effects of increased effect, energy saving, and significant technical effect.

Inactive Publication Date: 2012-12-19
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method of using the same frequency pulse magnetic field and pulse current coupling to realize the refinement of metal solidification structure, so as to solve the problems of poor refinement effect, uneven solidification structure and high external field energy consumption in the current control of metal solidification structure.

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  • Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency
  • Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency
  • Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency

Examples

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Effect test

Embodiment 1

[0039] Example 1: The same frequency pulsed magnetic field and pulsed current control the solidification structure of pure aluminum in the graphite mold

[0040] The experimental process is as follows:

[0041] Melt preparation: Melt 1kg (99.7%) of industrial pure aluminum at 720°C;

[0042] Mold: Electrode graphite mold, baked to 400°C, the size of the graphite mold is Φ160×150mm, a tungsten electrode is placed in the center of the bottom of the graphite mold, and a corundum tube is used to insulate the tungsten electrode from the mold. Before the graphite mold is used Insert the bottom electrode;

[0043] Solidification process: After the aluminum melt is degassed and the temperature drops to 700 ° C, it is poured into the graphite mold, another tungsten electrode is inserted into the melt, and then the pulse magnetic field is turned on and the pulse current power supply is turned on to adjust the pulse magnetic field. The parameters are: pulse width is 10 mu s, the act...

Embodiment 2

[0045] Example 2: Continuous casting and solidification of refined pure aluminum in a water-cooled copper crystallizer with the same frequency pulsed magnetic field and pulsed current

[0046] The experimental process is as follows:

[0047] Melt preparation: Melt 500kg (99.7%) of industrial pure aluminum at 720°C;

[0048] Copper crystallizer: The size of the continuous casting crystallizer is Φ280×250mm. The bottom electrode is placed on the dummy rod. The electrode and the dummy rod are insulated with a corundum tube. The bottom electrode is installed before pouring;

[0049] Solidification process: After the aluminum melt is degassed, when the temperature drops to 710°C, it is poured into the crystallizer and the semi-continuous casting dummy casting is started at the same time. The casting speed is 0.2m / min. When the liquid level in the crystallizer is stable Finally, insert another tungsten electrode into the melt, and then turn on the pulse magnetic field and connect...

Embodiment 3

[0051] Example 3: Semi-continuous casting and solidification of pure copper refined by the same frequency pulsed magnetic field and pulsed current in a water-cooled stainless steel crystallizer

[0052] The experimental process is as follows:

[0053] Melt preparation: 150kg (99.9%) of industrial pure copper is smelted at 1200°C;

[0054] Copper crystallizer: The size of the continuous casting crystallizer is Φ280×250mm. The bottom electrode is placed on the stainless steel dummy rod. The electrode and the dummy rod are insulated with a corundum tube. The bottom electrode is installed before pouring;

[0055] Solidification process: After the copper melt is degassed, when the temperature drops to 1150°C, it is poured into the crystallizer and the semi-continuous casting dummy casting is started at the same time. The casting speed is 0.5m / min. When the liquid level in the crystallizer is stable Finally, insert another tungsten electrode into the melt, then turn on the pulsed...

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Abstract

The invention discloses a method for refining a metal solidification structure by using a pulsed magnet field and pulse current with the same frequency and belongs to the technical field of metal solidification control. The method is mainly characterized in that: the pulse current is introduced into a metal melt in the process of metal solidification; simultaneously, the pulsed magnet field with the same frequency as the pulse current is applied to the metal melt; and a magnetic-electro impact and oscillation effect is generated in the melt through the coupling effect of the pulsed magnet field and the pulse current so as to promote the formation of crystalline rain and achieve the effect of refining the metal solidification structure. The method has the advantages that: the coupling effect of the pulsed magnet field and the pulse current with the same action frequency and pulse width has the obvious effect of refining the metal solidification structure and the energy-saving effect ofthe pulse charge and discharge is obvious. The method can be used for die casting, semi-continuous casting and continuous casting of the metal and is suitable for refining solidification structures of various metal melts.

Description

technical field [0001] The invention relates to the technical field of metal solidification control, in particular to a method for refining metal solidification structures with pulsed magnetic fields and pulse currents at the same frequency. Background technique [0002] The solidification structure control of metal materials is an important means to improve the properties of materials, especially the solidification and fine-grained technology of materials has been widely concerned in recent years, and is regarded as one of the main means to improve material properties. The super steel development plan proposed by China will also crystallize Grain refinement is an important way to realize the preparation of super steel; there are many technologies for solidification fine grain, and the traditional methods include: rapid solidification method, chemical inoculation method and external field control method, etc.; rapid solidification method is limited by cooling intensity It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02
Inventor 王宏明李桂荣赵玉涛张廷旺张勋寅
Owner JIANGSU UNIV
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