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Method for producing aluminum strontium alloy wire rod with high content of strontium and without deterioration latency stage

A technology of aluminum strontium alloy and manufacturing method, which is applied in the field of manufacturing aluminum strontium alloy wire rod with high strontium content without metamorphism incubation period, can solve the problems of affecting the compactness of aluminum alloy castings, reducing the mechanical properties of castings, slow melting speed, etc., and achieves processing performance. Good, improve fluidity and casting properties, smooth surface effect

Active Publication Date: 2009-11-04
HUNAN JINLIANXING SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, the aluminum-strontium alloy produced under the traditional process conditions is due to its compound Al 4 Sr size is large (50-200μm), due to Al 4 The Sr compound has a high melting point, and the melting speed is slow after adding aluminum liquid, resulting in a 30-minute (or more) deterioration incubation period
Unsuitable for plants requiring continuous melting casting operations
At the same time, the high hydrogen content (1-2ml / 100gAl) in the traditional aluminum-strontium alloy will directly affect the compactness of the aluminum alloy casting, resulting in a decrease in the mechanical properties of the casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Manufacture of Aluminum-Strontium Alloy (AlSr20) Wire Rod Containing 20% ​​Strontium

[0018] Put 80kg of 99.7% aluminum ingots into an intermediate frequency induction furnace to melt, and raise the temperature to 1000°C, supplemented by electromagnetic stirring and heat preservation. The content of aluminum cans sealed in batches is 99.6% and 20kg of metal strontium is completely melted, and the alloying treatment is continued for 30 minutes at a temperature of 1000° C. and under the action of electromagnetic force. Use a high-speed rotary degasser to inject argon gas into the molten aluminum at a temperature of 1000°C for degassing treatment, and measure the gas content. When the gas content H≤0.2ml / 100gAl, inject the alloy liquid into the semi-continuous hot top casting machine. Casting is carried out under direct water cooling, and the casting temperature is 950°C. The cast ￠76mm sample billet was cut into 500mm length. Cooperate with extruder at 500℃ to make smo...

Embodiment 2

[0020] Manufacture of Al-Strontium Alloy (AlSr30) Wire Rod Containing 30% Sr

[0021] Melt 70kg of 99.7% pure aluminum ingots in a medium frequency induction furnace and heat up to 1000°C, add 99.6% strontium metal sealed in aluminum cans in batches to a total of 30kg, and continue alloying under the action of electromagnetic field force at 1000°C Chemical treatment for 30 minutes. At the temperature of the aluminum alloy liquid at 1000°C, use a high-speed rotation to feed the argon gas degasser, and measure the hydrogen content. When the hydrogen content is reduced to H≤0.2ml / 100gAl. The alloy liquid is poured into a semi-continuous hot-top casting machine for direct water-cooled casting at a casting temperature of 950°C. Saw the cast ￠76mm billet into proper length. Cooperate with extruder for hot extrusion, and extrude at a rod temperature of 500°C to form a smooth aluminum-strontium alloy wire with a strontium content of Sr30% and ￠9.5-9.8mm.

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PUM

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Abstract

The invention relates to a material manufacturing process for aluminum alloy metamorphism, in particular to a manufacturing method of an aluminum-strontium alloy wire rod with a high strontium content and no metamorphic incubation period. The invention uses a new manufacturing process to manufacture aluminum-strontium alloy blanks with high strontium content. Through the alloying treatment under the action of the electromagnetic field, the Al4Sr compound formed during the alloying process of aluminum strontium is formed into a small plate shape (5-15 μm in size), and the Al4Sr is easy to be melted, and its modification effect can be displayed in tens of seconds, basically no Metamorphic incubation period. The invention uses the rotary degassing technology to degas the aluminum-strontium alloy liquid. Make its gas content drop to H≤0.2ml / 100gAl. Therefore, its fluidity and casting performance are greatly improved, and a billet material with high strontium content that is easy to be hot-processed is cast. The billet has good machinability in hot extrusion deformation, and the processed wire has a smooth surface without air bubbles, peeling and cracks.

Description

technical field [0001] The invention relates to a material manufacturing process for aluminum alloy metamorphism, in particular to a manufacturing method of an aluminum-strontium alloy wire rod with a high strontium content and no metamorphic incubation period. Background technique [0002] As a modifier of hypoeutectic aluminum-silicon alloy, strontium has a long effective time for modification, and it can last for several hours without obvious decline. "Light Metals" introduced in the 8th issue of 2001 that aluminum-strontium alloys can change the mechanical properties (elongation and impact resistance) of aluminum-silicon alloys in the as-cast and heat-treated states, and have a higher yield than traditional modifiers. Good performance, no excessive deterioration and no equipment corrosion. [0003] The production of aluminum-strontium alloys is generally produced by the double-mixing method, that is, aluminum and strontium are smelted into aluminum-strontium master allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P17/00C22C1/02B22D11/06B21C23/02
Inventor 陈建春刘万库
Owner HUNAN JINLIANXING SPECIAL MATERIALS CO LTD