Modifying process of cast Al-si alloy

A casting aluminum-silicon alloy and metamorphic treatment technology, which is applied in the field of metallographic control in metal heat treatment processing, can solve problems such as damaging human health, polluting the atmosphere, and affecting metamorphic effects, and achieves long anti-failure life, obvious metamorphic effect, and easy operation Effect

Inactive Publication Date: 2006-05-17
SHANGHAI UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The ignition point of red phosphorus is low, and the burning loss is serious before melting into molten aluminum, which affects the effect of metamorphism, and releases toxic gas during the metamorphism process, pollutes the atmosphere, and damages human health; phosphorus salts will produce a large amount of reaction slag during the experiment , which affects the quality of molten aluminum, has a strong corrosive effect on reaction vessels such as crucibles, and is not suitable for wide application; the Cu-P intermediate alloy has a high melting point, and it is difficult to completely melt into molten aluminum to play its role, and the Cu-P The amount of burning loss is very small, and segregation is easy to occur after adding, which affects the overall performance. It is not suitable for use under the condition of high alloy composition requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: 1200 grams of cast aluminum-silicon alloy A356 was conventionally melted, and 0.5 wt % of rare earth metal Ce was added to the mother liquor at a temperature of 850 ° C, that is, the weight of Ce added was 6 grams, followed by vigorous stirring to make it fully Reaction, then conventional degassing and slag removal, and then casting after 30 minutes of heat preservation. When casting, a metal mold is used, and the metal mold needs to be preheated to 200°C, and then cooled to room temperature with the mold to obtain a cast aluminum-silicon alloy ingot after deterioration.

[0014] The microstructure of the cast aluminum-silicon alloy A356 after modification has undergone obvious changes through instrumental testing, and the eutectic structure has changed from thick needles or plates to short rods or pellets, and the distribution is uniform. Compared with the original ingot, its mechanical properties are greatly improved, the tensile strength is increased from ...

Embodiment 2

[0015] Example 2: 1200 grams of cast aluminum-silicon alloy Al-14.5Si alloy was conventionally melted, and 0.5 wt% of rare earth metal Ce was added to the mother liquor at a temperature of 830 ° C, that is, the weight of Ce added was 6 grams, followed by vigorous stirring , to make it fully react, then carry out conventional degassing and slag removal, and then cast after holding the heat for 30 minutes. When casting, a metal mold is used, and the metal mold needs to be preheated to 200°C, and then cooled to room temperature with the mold to obtain a cast aluminum-silicon alloy ingot after deterioration.

[0016] The microstructure of cast aluminum-silicon alloy Al-14.5Si after modification treatment has undergone obvious changes through instrumental testing, the size of primary silicon is significantly smaller than that of the original ingot, and the distribution is uniform, and the eutectic structure changes from coarse needle-like to Or the plate shape is changed to a short...

Embodiment 3

[0017] Embodiment 3: The preparation process and steps of this embodiment are exactly the same as those of Embodiment 1. The difference is that the cast aluminum-silicon alloy used is Al-18Si alloy.

[0018] The microstructure of cast aluminum-silicon alloy Al-18Si alloy after the modification treatment has undergone obvious changes through instrument detection, and the primary silicon has changed from a coarse irregular polygon to a regular shape, with a significantly reduced size and uniform distribution. The eutectic structure changes from thick needles to short rods or pellets. Compared with the original ingot, its mechanical properties are greatly improved, the tensile strength is increased from 62MPa of the original material to 91MPa, and the elongation is increased from 2.4% of the original material to 3.2%.

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Abstract

The present invention is modifying process of cast Al-Si alloy, and belongs to the field of metallurgical structure controlling technology in metal heat treatment. The modifying process of cast Al-Si alloy includes the following steps: smelting cast Al-Si alloy, adding 0.25-2.0 wt% Ce into the mother liquid at 800-850 deg.c, stirring intensely for full reaction, deairing and eliminate slag, maintaining the temperature for 30-60 min, casting, and cooling in the mold to room temperature to obtain the modified cast Al-Si alloy ingot. The modified cast Al-Si alloy ingot has obviously changed microscopic metallurgical structure, homogeneously distributed short rod or granular metallurgical structure, and greatly raised mechanical performance and other advantages.

Description

technical field [0001] The invention relates to a method for modifying cast aluminum-silicon alloy to improve its metallographic structure and improve its mechanical properties, and belongs to the technical field of metallographic control in metal heat treatment processing. Background technique [0002] Cast aluminum-silicon alloy has the advantages of low density, high specific strength, good plasticity, and reusability. Cast aluminum-silicon alloys are widely used in industrial fields such as electric power, automobiles and aerospace. [0003] In the hypoeutectic cast aluminum-silicon alloy, as the silicon content increases, the number of eutectic crystals in the structure increases. Although the casting performance is improved, a large number of needle-like eutectic silicon appear in the structure; beyond the eutectic point, the silicon content decreases Further improvement, thick polygonal plate-shaped primary silicon will appear in the hypereutectic aluminum-silicon al...

Claims

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Application Information

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IPC IPC(8): C22C1/06B22D1/00C22C21/02
Inventor 张恒华段海丽邵光杰许珞萍
Owner SHANGHAI UNIV
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