Composite metamorphic agent and composite metamorphic method of cast aluminum-silicon alloy

A technology of casting aluminum-silicon alloy and composite modifier, which is applied in the field of casting aluminum alloy modification, and can solve the problem that the synchronous refinement of eutectic silicon and α-Al grains cannot be realized.

Active Publication Date: 2019-03-08
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that although RE can improve the modification and refinement ability of Sr and Al-Ti-B to a certain extent, it cannot realize the synchronous refinement of eutectic silicon and α-Al grains, and improve the alloy's alloy to a greater extent. toughness

Method used

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  • Composite metamorphic agent and composite metamorphic method of cast aluminum-silicon alloy
  • Composite metamorphic agent and composite metamorphic method of cast aluminum-silicon alloy
  • Composite metamorphic agent and composite metamorphic method of cast aluminum-silicon alloy

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Effect test

Embodiment 1

[0047] This embodiment provides a method for compound modification of cast aluminum-silicon alloy, which includes the following steps:

[0048] S1: Put the prepared alloy raw materials into the melting furnace, heat the raw materials to 500°C, keep them warm for 30 minutes, and then raise the temperature to 750°C;

[0049] S2: After all the raw materials are melted, the melt temperature is lowered to 700°C. The aluminum melt is subsequently refined in-line.

[0050] S3: Remove slag after 15 minutes of heat preservation, add Al-Ti-B and Al-Sr master alloys wrapped in aluminum foil, and the amount of Al-Ti-B and Sr added is 0.02% of the mass of the melt respectively , 0.04%, and then press it into the melt with a titanium tool, and slowly stir the melt after melting to make it evenly distributed.

[0051] S4: The melt was left to stand for 60 minutes and then cast into an ingot to prepare a cast 1# aluminum alloy ingot.

[0052] After modification, the chemical composition of...

Embodiment 2

[0054] This embodiment provides a method for compound modification of cast aluminum-silicon alloy, which includes the following steps:

[0055] S1: Put the prepared alloy raw materials into the melting furnace, heat the raw materials to 500°C, keep them warm for 30 minutes, and then raise the temperature to 800°C;

[0056] S2: After all the raw materials are melted, the temperature of the melt is lowered to 710°C. The aluminum melt is subsequently refined in-line.

[0057] S3: After 30 minutes of heat preservation, remove the slag, add the preheated Al-Ti-B, Al-Sr, Al-RE master alloys wrapped in aluminum foil, and the addition amounts of Al-Ti-B, Sr, and RE are respectively 0.02%, 0.04%, and 0.05% of the mass of the melt are pressed into the interior of the melt with titanium tools, and after melting, the melt is slowly stirred to make it evenly distributed.

[0058] S4: The melt was left to stand for 60 minutes and then cast into an ingot to prepare a cast aluminum alloy in...

Embodiment 3

[0061] This embodiment provides a method for compound modification of cast aluminum-silicon alloy, which includes the following steps:

[0062] S1: Put the prepared alloy raw materials into the melting furnace, heat the raw materials to 500°C, keep them warm for 30 minutes, and then raise the temperature to 760°C;

[0063] S2: After all the raw materials are melted, the temperature of the melt is lowered to 720°C. The aluminum melt is subsequently refined in-line.

[0064] S3: After keeping warm for 20 minutes, remove the slag, add the preheated Al-Ti-B, Al-Sr, Al-RE master alloys wrapped in aluminum foil, and the addition amounts of Al-Ti-B, Sr, and RE are respectively 0.04%, 0.03%, and 0.05% of the mass of the melt are pressed into the interior of the melt with a titanium tool, and after melting, the melt is slowly stirred to make it evenly distributed.

[0065] S4: The melt was left to stand for 40 minutes and then cast into an ingot to prepare a cast aluminum alloy ingot...

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Abstract

The invention discloses a composite metamorphic agent and a composite metamorphic method of a cast aluminum-silicon alloy, and relates to the technical field of metamorphism of cast aluminum alloys. The composite metamorphic method mainly uses the composite metamorphic agent for metamorphism. The composite metamorphic agent comprises an Al-Ti-B intermediate alloy, an Al-Sr intermediate alloy and an Al-RE intermediate alloy; the appending proportion of the Al-Ti-B intermediate alloy is 0.01%-0.04% of the melt mass of the cast aluminum-silicon alloy; the additive amount of Sr in the Al-Sr intermediate alloy is 0.01-0.05% of the melt mass; and the additive amount of RE in the Al-RE intermediate alloy is 0.01%-0.1% of the melt mass. According to the composite metamorphic method of the cast aluminum-silicon alloy, the cost is low, operation is easy, the purpose of synchronously refining alpha-Al crystalline grains and metamorphic eutectic silicon can be achieved through composite metamorphism, the additive amount of the Sr, and Al-Ti-B is decreased, thus the tensile strength and elongation of the alloy can be improved, and meanwhile, the strength and toughness of a cast aluminum alloy can be improved.

Description

technical field [0001] The invention relates to the technical field of modification of cast aluminum alloys, and in particular to a composite modification agent and a method for composite modification of cast aluminum-silicon alloys. Background technique [0002] Al-Si series cast aluminum alloys have the advantages of excellent casting fluidity and air tightness, small thermal expansion coefficient, good weldability and machining properties, and are widely used in the fields of automobiles and motorcycles, aerospace, communications and electronic appliances. According to statistics, in 2017, the output of aluminum alloy castings in my country reached 7.92 million tons, of which aluminum-silicon alloy castings accounted for about 85% to 90%. Among the automotive product castings, aluminum-silicon alloy castings also account for more than 80% of the total automotive castings, becoming one of the most important lightweight materials for automotive lightweighting. With the gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 宋东福康跃华王顺成甘春雷楼华山黄毅李宏军
Owner GUANGDONG INST OF NEW MATERIALS
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