Method for solidifying microlite by impulse current liquid surface disturbance

A technology of pulse current and liquid level, applied in the field of metal solidification, can solve problems such as high cost, reduced plasticity, and reduced mechanical properties

Inactive Publication Date: 2008-01-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, relying on the method of adding a grain refiner to the melt is not only costly and complicated in the preparation process, but also sometimes due to the addit

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  • Method for solidifying microlite by impulse current liquid surface disturbance
  • Method for solidifying microlite by impulse current liquid surface disturbance

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Embodiment 1

[0025] The material of this embodiment is industrial pure aluminum with a purity of 99.7wt.%. The casting mold is a water glass sand dry mold, and the casting size is Φ40×140mm. Disturbance treatment in the nucleation stage and the whole process of solidification are respectively carried out. In order to enhance the contrast, Fig. 2 shows the macrostructure of pure aluminum without pulse current liquid level disturbance, and Fig. 3 shows the macrostructure of pure aluminum treated with pulse current by vertical electrodes (current peak value is 2000A, pulse frequency is 800Hz).

[0026] The pulse current liquid level disturbance treatment in the nucleation stage, the specific process is as follows: first, the metal is melted into a liquid, and when the molten metal is overheated at 180°C, it is poured out of the furnace, and two parallel electrodes are inserted from above the melt 30mm below the liquid level of the metal, from The thermal analysis curve of the online detection ...

Embodiment 2

[0030] High-carbon chromium bearing steel is used as the experimental material, and its composition is C=0.80~0.96%, Si=0.20~0.35%, Mn=0.3~0.5%, P<0.025%, S<0.02%, Cr=1.35~1.50% , Ni+Cu<0.52%. In order to ensure the consistency of molten metal composition, pouring temperature and cooling conditions, and to ensure the comparability of experimental results, the experimental scheme of "simultaneous pouring and split filling" was adopted. The molten metal passes through the distribution groove and flows into the sample cavities of the same size respectively at the same time. The sample size is Φ50mm×180mm. The casting mold adopts the water glass sand dry type. The specific process is as follows: the Φ40 bar is remelted in an intermediate frequency induction furnace, and finally deoxidized with 0.2% aluminum before being released from the furnace. The pouring temperature is 1650°C (overheating 180°C). After the pouring is completed, insert two parallel electrodes from above the ...

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Abstract

A process for fine crystallization of metal liquid by electric current pulses is carried out by: smelting metal and over-heating, casting, inserting two parallel electrodes from above into molten metal, and disturbing metal liquid by 1000-4000A impulse electric current at 100-1000Hz to obtain fine-crystallized cast ingots. The disturbance is divided into both periods of core forming and solidifying. It can be used mold casting or continuous casting various metals.

Description

technical field [0001] The invention relates to a pulse current liquid level disturbance solidification fine-grain method, which belongs to the technical field of metal solidification. Background technique [0002] Solidification and fine-grain technology has always been a research topic for metallurgical materials scholars, so a large number of solidification and fine-grain technologies have emerged with the deepening of research. At present, the metal solidification and fine-grain methods can be roughly classified into the following categories: (1) pouring process and heat transfer condition control methods; (2) chemical treatment methods; (3) kinetic refinement methods. [0003] The control methods of pouring process and heat transfer conditions mainly include pouring process control technology, low temperature pouring, increasing cooling speed and increasing supercooling degree, etc. These methods are traditional refinement methods. For example, in the continuous castin...

Claims

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Application Information

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IPC IPC(8): C21D10/00C22F3/02B22D27/02
Inventor 翟启杰高玉来李杰马建宏李仁兴龚永勇侯旭
Owner SHANGHAI UNIV
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