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Method and device for preparing semi-solid alloy slurry by applying square wave pulse current

A square wave pulse current and semi-solid technology, applied in the field of metal materials and metallurgy, can solve the problems of difficult quantitative research on the solidification process, large volume of RLC pulse power supply, inconvenient production and experiment, etc., and achieves a wide range of applicable alloys, low cost, The effect of easy operation

Inactive Publication Date: 2012-08-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some deficiencies in this patent: firstly, the used pulse power supply is an RLC circuit. In the RLC circuit, the current is realized by the charging and discharging of the capacitor, and the pulse current density of the alloy liquid is very different at each moment. Quantitative research on the solidification process brings great difficulties; secondly, the RLC pulse power supply is huge in size, requires a special site, and lacks flexibility, which brings a lot of inconvenience to production and experiments; end insertion, the lower electrode needs to pass through the bottom of the crucible, which is very difficult in practice

Method used

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  • Method and device for preparing semi-solid alloy slurry by applying square wave pulse current
  • Method and device for preparing semi-solid alloy slurry by applying square wave pulse current

Examples

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Effect test

Embodiment 1

[0043] The liquidus temperature of AZ91D magnesium alloy is 595℃, and the solidus temperature is 470℃. The AZ91D alloy is melted and refined in the resistance furnace 7, and SF is used for the whole process 6 and CO 2 The mixed gas is used for protection to prevent oxidation and combustion. After the slag removal and degassing process, the temperature is lowered to 610°C and kept for 15 minutes to make the temperature field and solute field of the alloy melt 10 uniform, and the electrode 5 is inserted into the alloy melt 10. , and use the lock nut 4 to fix the electrode holder 3. When the alloy melt 10 is cooled to 600°C, start the square wave pulse power supply 1 to start processing the alloy melt 10, the current is 20A, the pulse frequency is 0.5Hz, and the duty cycle is 100%, and the processing continues until the temperature of the alloy melt 10 The temperature is lowered to 590°C, during which the average cooling rate of the alloy melt 10 is controlled to be 0.5°C / min. ...

Embodiment 2

[0045] The liquidus temperature of ZL101 aluminum alloy is 586°C, and the solidus temperature is 516°C. The ZL101 alloy is melted and refined in the resistance furnace 7, and after the slag removal and degassing process, the temperature is lowered to 600°C and kept for 15 minutes, and the electrode 5 is inserted into the alloy melt 10, and the electrode is fixed with the lock nut 4 Chuck 3. When the alloy melt 10 is cooled to 591° C., start the square wave pulse power supply 1 to start processing the alloy melt 10. The current is 600 A, the pulse frequency is 500 Hz, and the duty cycle is 15%. The temperature of the alloy melt 10 continues to drop. During this period, the average cooling rate of the alloy melt 10 was controlled to be 2°C / min. After the pulse current is applied, the electrode 5 is taken out, the electrode holder 2 is removed, and the alloy melt 10 is slowly cooled to a predetermined temperature to obtain a semi-solid slurry. The semi-solid microstructure of Z...

Embodiment 3

[0047] The liquidus temperature of A390 aluminum alloy is 616°C, and the solidus temperature is 568°C. The A390 alloy is melted and refined in the resistance furnace 7, refined with hexafluoroethane at 720°C, and after slag removal and degassing processes, the temperature is lowered to 630°C and kept for 15 minutes, and the electrode 5 is inserted into the alloy melt 10 , use the lock nut 4 to fix the electrode holder 3. When the alloy melt 10 is cooled to 621°C, start the square wave pulse power supply 1 to start processing the alloy melt 10, the current is 300A, the pulse frequency is 200Hz, and the duty cycle is 50%, and the temperature of the alloy melt 10 continues to drop. during which the average cooling rate of alloy melt 10 is controlled to be 1°C / min. After the pulse current is applied, the electrode 5 is taken out, the electrode holder 2 is removed, and the alloy melt 10 is slowly cooled to a predetermined temperature to obtain a semi-solid slurry. The semi-solid ...

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Abstract

The invention discloses a method and a device for preparing semi-solid alloy slurry by applying square wave pulse current. The method comprises the subsequent processes of: (1) adjusting refined melt in a crucible to be within 40-70 DEG C above a liquid phase line, cooling to 10-20 DEG C above the liquid phase line, standing and preserving heat for 15 minutes; (2) selecting and controlling cooling rate of the melt according to the type of the alloy, applying the square wave pulse current to the melt when the melt is cooled to 5 DEG C above the liquid phase line, and stopping application when the melt is continuously cooled to 5 DEG C below the liquid phase line, and guaranteeing that the application temperature interval of the square wave pulse current covers the entire nucleation stage of the melt; and (3) slowly cooling the treated melt to be within + / -5 DEG C of semi-solid forming temperature to prepare the semi-solid slurry. The device comprises a square wave pulse power supply, a current application device and a heating and heat preservation device. According to the method and the device, by applying the square wave pulse current to the melt at the nucleation stage for treatment and controlling the cooling rate, the semi-solid alloy slurry with spherical or granular primary phase is obtained. The method and the device are suitable for preparing semi-solid slurry of various alloys.

Description

technical field [0001] The invention relates to a metal preparation method and device, in particular to a method and device for preparing semi-solid alloy slurry by applying a square wave pulse current suitable for the semi-solid forming process of metal materials, especially suitable for magnesium alloy and aluminum alloy semi-solid The forming process belongs to the technical field of metal materials and metallurgy. Background technique [0002] Semi-solid processing technology is a new method of metal forming proposed by Professor M.C.Flemings of the Massachusetts Institute of Technology in the 1970s. This method uses the process of metal transition from liquid to solid or from solid to liquid (that is, liquid-solid coexistence) The characteristics possessed by it are formed. This new forming processing method combines the strengths of solidification processing and plastic processing, that is, the processing temperature is lower than that of the liquid state, and the def...

Claims

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Application Information

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IPC IPC(8): B22D27/02C22C1/02
Inventor 张扬吴国华刘文才丁文江
Owner SHANGHAI JIAO TONG UNIV
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