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Method for reducing microporosity of casting silicon-aluminum alloy

A technology of silicon-aluminum alloy and microporosity, which is applied in the field of casting silicon-aluminum alloy, can solve the problems of unsatisfactory as-cast mechanical properties, unsatisfactory industrial production, and affecting the ductility of castings, so as to reduce microporosity and eliminate casting Decreased performance and improved mechanical properties

Inactive Publication Date: 2018-07-24
安徽玉成光华铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Cast aluminum-silicon alloy is a non-ferrous alloy material with light weight and high strength. It is widely used in aerospace, automobile, electric power, military industry, machinery and other fields. Among cast aluminum alloys, cast aluminum including ZL108 is the most widely used Silicon-based alloys, which have a series of advantages such as small bulk density, high strength, good casting formability and excellent processability, have become one of the most valued structural materials in the manufacturing industry. However, the current casting state of cast Al-Si alloys The mechanical properties are still unsatisfactory. Although the mechanical properties can be improved by heat treatment, as the requirements for product reliability and service life are getting higher and higher, it still cannot meet the requirements of industrial production. Therefore, people are studying it from various research directions. The as-cast aluminum-silicon alloy is studied in order to improve its comprehensive performance. The microporosity of the silicon-aluminum alloy obtained by the existing preparation method will affect the ductility of the casting and reduce its mechanical properties. How to reduce the microporosity of the silicon-aluminum alloy Sex has an important influence on the performance of silicon-aluminum alloy castings

Method used

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Examples

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Effect test

Embodiment 1

[0011] A method for reducing the microporosity of cast silicon-aluminum alloys, the alloy is composed of the following elements in weight percent, silicon 16.5%, iron 0.32%, copper 2.4%, dysprosium 0.9%, manganese 0.2%, magnesium 0.15%, zinc 0.16% %, the balance is aluminum and unavoidable impurities; the preparation method is to prepare the raw materials according to the above element composition, add the molten pool to melt at a temperature of 740 ° C, keep it for 8 minutes and then raise the temperature to 810 ° C, without adding refining agent, in the melting Nitrogen gas is introduced into the melt to make the melt circle slowly in the melting furnace. After 25 minutes of treatment, a sample is taken for testing, and the element content is further adjusted; when the temperature is lowered to 660°C, acetic anhydride equivalent to 1% of the weight of the charge is added. After 8 minutes of treatment, the slag is removed from the furnace for casting, and after the casting is ...

Embodiment 2

[0015] A method for reducing the microporosity of cast silicon-aluminum alloys, the alloy is composed of the following elements in weight percent, silicon 14%, iron 0.35%, copper 2.2%, dysprosium 1.2%, manganese 0.3%, magnesium 0.1%, zinc 0.08 %, the balance is aluminum and unavoidable impurities; the preparation method is to prepare the raw materials according to the above element composition, put them into the molten pool for melting at a temperature of 740 ° C, keep the temperature for 5 minutes and then raise the temperature to 820 ° C, without adding refining agent, in the melting Nitrogen gas is introduced into the melt to make the melt circle slowly in the melting furnace. After 20 minutes of treatment, a sample is taken for testing, and the element content is further adjusted; when the temperature is lowered to 670°C, acetic anhydride equivalent to 0.8% of the weight of the furnace charge is added. After 10 minutes of treatment, the slag is removed from the furnace for ...

Embodiment 3

[0019] A method for reducing the microporosity of cast silicon-aluminum alloys, the alloy is composed of the following elements in weight percent, silicon 18%, iron 0.28%, copper 2.6%, dysprosium 0.6%, manganese 0.1%, magnesium 0.2%, zinc 0.22 %, the balance is aluminum and unavoidable impurities; the preparation method is to prepare the raw materials according to the above element composition, add the molten pool to melt at a temperature of 740 ° C, keep it for 10 minutes and then raise the temperature to 800 ° C, without adding refining agent, in the melting Nitrogen gas is introduced into the melt to make the melt circle slowly in the melting furnace. After processing for 30 minutes, take a sample for testing and further adjust its element content; when the temperature is lowered to 650°C, add 1.2% acetic anhydride equivalent to the weight of the charge After 6 minutes of treatment, the slag is removed from the furnace for casting, and after the casting is completed, it can ...

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Abstract

The invention belongs to the technical field of casting silicon-aluminum alloy, and particularly relates to a method for reducing microporosity of casting silicon-aluminum alloy. The method comprisesthe following steps that raw materials are prepared, the raw materials are added into a melting pool at 740 DEG C for melting, after keeping 5-10 minutes, the raw materials are heated up to 800-820 DEG C; when the raw materials are cooled down to 650-670 DEG C, acetic anhydride with the weight counting for 0.8-1.2% of furnace burden is added, slagging-off, discharging from a furnace and casting are carried out after treatment for 6-10 minutes, and heat treatment is carried out after the casting is completed. Compared with the prior art, the method has the following advantage that through scientifically proportioning the content of each element, refining process of a refining agent is omitted, the fluidity of the materials is improved by introducing nitrogen, the problem that the casting performance is lowered due to the content of silicon is solved, addition of dysprosium can effectively reduce the microporous rate of the alloy, surface tension of the alloy during the casting process is improved, and the mechanical properties of the alloy are improved.

Description

technical field [0001] The invention belongs to the technical field of cast silicon-aluminum alloys, and in particular relates to a method for reducing the microporosity of cast silicon-aluminum alloys. Background technique [0002] Cast aluminum-silicon alloy is a non-ferrous alloy material with light weight and high strength. It is widely used in aerospace, automobile, electric power, military industry, machinery and other fields. Among cast aluminum alloys, cast aluminum including ZL108 is the most widely used Silicon-based alloys, which have a series of advantages such as small bulk density, high strength, good casting formability and excellent processability, have become one of the most valued structural materials in the manufacturing industry. However, the current casting state of cast Al-Si alloys The mechanical properties are still unsatisfactory. Although the mechanical properties can be improved by heat treatment, as the requirements for product reliability and ser...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02C22F1/043
CPCC22C21/02C22C1/026C22F1/043
Inventor 何启华
Owner 安徽玉成光华铝业有限公司
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