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Process method capable of improving refinement and modification effects of A356 aluminum alloy

A process method and technology of aluminum alloy, applied in the field of aluminum alloy melting and casting, can solve the problems of high surface energy, reduced surface energy, poor refining and metamorphic effect, etc.

Inactive Publication Date: 2015-01-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dispersed and fine A14Sr phase has a large specific surface area and high surface energy, and its dissolution rate is fast, so that Sr atoms are easily dissociated from it, reducing the surface energy and making Sr have a good fineness. However, the thick and flaky A14Sr phase is unevenly distributed, so it is not easy to dissociate Sr atoms from it, and the effect of refinement and modification is not good, that is, in the Al-10Sr master alloy added The morphology, size, distribution, surface state and energy of the second phase have a direct impact on the refinement and modification effect of A356 aluminum alloy

Method used

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  • Process method capable of improving refinement and modification effects of A356 aluminum alloy
  • Process method capable of improving refinement and modification effects of A356 aluminum alloy
  • Process method capable of improving refinement and modification effects of A356 aluminum alloy

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Effect test

Embodiment 1

[0020]Al-10Sr master alloy is used as modifier: Sr 10.00%, Ti ≤ 0.02%, Si ≤ 0.12%, Fe ≤ 0.06%, the content of other impurity elements is not more than 0.05%, the balance is Al, and the modified object is A356 Aluminum alloy, of which Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, and the content of other impurity elements is not more than 0.05% each, and the rest are Al, the composition is calculated by mass percentage, and the amount of modifier used is 0.10% of the mass of A356 aluminum alloy.

[0021] The melting process is : First pretreatment, cutting the Al-10Sr master alloy ingot into moderately sized blocks, then grinding and polishing to remove the scale on the surface, cleaning, drying and weighing in an ultrasonic oscillator with acetone, smelting assistance The tool is painted with ZnO paint, the thickness of the coating is 1.0mm-1.5mm, and it is dried in a box-type resistance furnace at a temperature of 200°C-300°C for standby; secondly, t...

Embodiment 2

[0024] Al-10Sr master alloy is used as modifier: Sr 10.00%, Ti ≤ 0.02%, Si ≤ 0.12%, Fe ≤ 0.06%, the content of other impurity elements is not more than 0.05%, the balance is Al, and the modified object is A356 Aluminum alloy, of which Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, and the content of other impurity elements is not more than 0.05% each, and the rest are Al, the composition is calculated by mass percentage, and the amount of modifier used is 0.30% of the mass of A356 aluminum alloy.

[0025] The melting process is : First pretreatment, cutting the Al-10Sr master alloy ingot into moderately sized blocks, then grinding and polishing to remove the scale on the surface, cleaning, drying and weighing in an ultrasonic oscillator with acetone, smelting assistance The tool is painted with ZnO paint, the thickness of the coating is 1.0mm-1.5mm, and it is dried in a box-type resistance furnace at a temperature of 200°C-300°C for standby; secondly, ...

Embodiment 3

[0028] Al-10Sr master alloy is used as modifier: Sr 10.00%, Ti ≤ 0.02%, Si ≤ 0.12%, Fe ≤ 0.06%, the content of other impurity elements is not more than 0.05%, the balance is Al, and the modified object is A356 Aluminum alloy, of which Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, and the content of other impurity elements is not more than 0.05% each, and the rest are Al, the composition is calculated by mass percentage, and the amount of modifier used is 0.50% of the mass of A356 aluminum alloy.

[0029] The melting process is : First pretreatment, cutting the Al-10Sr master alloy ingot into moderately sized blocks, then grinding and polishing to remove the scale on the surface, cleaning, drying and weighing in an ultrasonic oscillator with acetone, smelting assistance The tool is painted with ZnO paint, the thickness of the coating is 1.0mm-1.5mm, and it is dried in a box-type resistance furnace at a temperature of 200°C-300°C for standby; secondly, ...

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Abstract

The invention relates to a process method capable of improving refinement and modification effects of an A356 aluminum alloy and belongs to the technical field of smelting of the aluminum alloy. The process method is characterized in that an Al-10Sr intermediate alloy is adopted as a modifying agent, the A356 aluminum alloy is adopted as a to-be-modified object, in the step of smelting the Al-10Sr intermediate alloy, after slag is completely skimmed and oversize particles in a molten alloy are removed by filtration, the molten alloy is rapidly poured into a water-cooled copper mold so as to obtain the Al-10Sr intermediate alloy subjected to water-cooled copper mold process treatment and the A356 aluminum alloy is refined and modified by virtue of the Al-10Sr intermediate alloy subjected to water-cooled copper mold process treatment of which the addition accounts for 0.10%-0.50% of the mass of the A356 aluminum alloy melt. The microstructure and properties of the refined and modified A356 aluminum alloy can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy melting and casting, in particular to a process method capable of improving the refinement and deterioration effect of A356 aluminum alloy. Background technique [0002] A356 aluminum alloy is the most widely used alloy in the hypoeutectic Al-Si-Mg series alloy. It has good fluidity, no hot cracking tendency, small linear shrinkage, high specific strength and good casting performance. It is widely used in Aviation, aerospace, automobile, construction and other industries. However, in the unmodified A356 aluminum alloy, the Si phase presents a coarse needle-like shape, which severely splits the matrix of the alloy, and easily causes stress concentration at the tip and corners of the silicon phase, which reduces the strength, plasticity, and cutting of the material. Workability is significantly reduced. Therefore, in order to improve the mechanical properties of A356 aluminum alloy and impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
Inventor 王正军司乃潮刘光磊王宏健丁冉万浩王俊
Owner JIANGSU UNIV
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