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Thinning processing method for magnesium alloy fused mass and apparatus

A treatment method and a treatment device technology, which are applied in the field of magnesium alloy refinement treatment, can solve the problems of increased alloy smelting costs, refractory melting or decomposition, etc., and achieve the effects of improving the working environment, increasing production efficiency, and increasing strength

Inactive Publication Date: 2009-04-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this refinement increases the cost of alloy smelting, although the alloying method can refine the magnesium alloy
[0004] Granular graphite or aluminum carbide particles have the effect of refining the structure, but there is also the problem that it is difficult to melt or decompose in the melt

Method used

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  • Thinning processing method for magnesium alloy fused mass and apparatus
  • Thinning processing method for magnesium alloy fused mass and apparatus
  • Thinning processing method for magnesium alloy fused mass and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] When the melt temperature is 700°C, Ar and CO 2 Mixed gas, wherein the pressure of the mixed gas is 0.3MPa, the total flow of the mixed gas is 0.5L / min, CO 2 The volume fraction is 30%, the rotational speed of the rotary nozzle is 100 rpm, the treatment time is 60 minutes, and the rest is 30 minutes. figure 2 The metallographic structures of untreated and treated AZ91 alloys are respectively. Among them (a) is the unrefined macroscopic structure (b) the refined structure. The grain size before refinement was 234 μm, and the grain size after refinement was 72 μm.

Embodiment 2

[0034] When the melt temperature is 730°C, Ar and CO 2 Mixed gas, wherein the pressure of the mixed gas is 0.2MPa, the total gas flow is 1L / min, where CO 2 The volume fraction is 20%, the rotating speed of the rotary nozzle is 280 rpm, the treatment time is 45 minutes, and the rest is 20 minutes. Finely process 45 min for macroscopic tissues such as image 3 As shown, the grain size is: 54 μm.

Embodiment 3

[0036] When the melt temperature is 770°C, Ar and CO 2 Mixed gas, the pressure of the mixed gas is 0.4MPa. The total flow rate of mixed gas is 6L / min, CO 2 The volume fraction is 40%, the rotational speed of the rotary nozzle is 400 rpm, the treatment time is 30 minutes, and the rest is 10 minutes. Finely process macroscopic tissues such as Figure 4 As shown, the grain size is about 70 μm.

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Abstract

The invention relates to a thinning treatment technology which can be used for a magnesium alloy melt containing aluminum, and a special device thereof. The thinning treatment technology is that mixed gas of protective gas and carbon dioxide gas is blown into a magnesium-aluminum alloy melt by adopting a rotary blowing manner at 700 DEG C to 790 DEG C, the process is stopped after being carried out for 15min to 60min, and pouring is carried out after stillness for 10 min to 30 min, thus realizing the aim of thinning. The pressure of the mixed gas is 0.15MPa to 0.5MPa, the volume percentage of the carbon dioxide gas in the mixed gas is 20 percent to 40 percent, the flow of the mixed gas is 0.5ml / min to 10ml / min, and the rotary blowing speed is 100 to 500 revolutions per minute. The special device used for the technology is realized by that a gas bottle is connected to a nozzle by a gas mixer, and the pressure and the flow of the mixed gas introduced to the melt are adjusted by adjusting the reducing valve and the flow meter of the mixer. The invention can improve the purity of the magnesium alloy melt while thinning the magnesium alloy crystal grains, enhance the performance quality of casting products greatly, improve production conditions and increase labor production efficiency.

Description

technical field [0001] The invention relates to a refinement treatment process applicable to magnesium alloy melts and a special device thereof, and is particularly suitable for the refinement treatment of magnesium alloys containing aluminum elements. Background technique [0002] Because magnesium alloy has high specific strength and specific stiffness, it can be widely used in industry to reduce the weight of components. Applied in the automobile industry, it can significantly reduce gas emissions and reduce air pollution. Magnesium alloy melt refinement treatment, as an important means to improve the comprehensive properties of magnesium alloys and improve the formability of magnesium alloys, has been widely concerned and highly valued by people. The grain refinement effect is mainly reflected in the following aspects: ① fine grains help to improve the mechanical properties and plastic deformation ability of the alloy; ② fine grains help to reduce casting defects such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02B22D21/04
Inventor 张二林胡中潮杨磊杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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