Cast AlSi7Mg alloy and modification and refinement method thereof

A treatment method and a modificator technology, which are applied in the field of casting AlSi7Mg and its modification and refinement treatment, can solve the problems of poor elongation, batch scrapping of castings, and low casting strength, so as to ensure physical and mechanical properties, improve product stability, Guarantee the effect of product quality

Inactive Publication Date: 2016-06-15
HEBEI SHENGYUE RAILWAY ELECTRIFICATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Railway catenary components are one of the key components for safe railway operation. Cast aluminum alloy AlSi7Mg has been widely used in catenary components. However, the alloy has a flaky silicon phase in the casting process, which has a great impact on the splitting of the structure. At the same time, there is also the problem of coarse structure, which eventually leads to the bad problems of low strength and poor elongation of the casting after pouring, and the mechanical properties of the material cannot be fully exerted.
It is easy to cause castings to be scrapped in batches or to fail early during work, which brings huge safety hazards to the safe operation of the railway. How to stably and effectively change the shape of the silicon phase in the cast aluminum alloy AlSi7Mg and refine the α body prompts the comprehensive mechanical properties of the castings. become an important problem that urgently needs to be solved

Method used

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  • Cast AlSi7Mg alloy and modification and refinement method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Weigh 600 kilograms of AlSi7Mg aluminum ingots and melt them into molten aluminum in a melting furnace with a set temperature of 760°C;

[0038] Step 2: transfer the obtained molten aluminum to the holding furnace at 750-760°C, set the temperature of the holding furnace at 720°C, and cool down the molten aluminum in the holding furnace;

[0039] Step 3: Measure the temperature of the molten aluminum in the holding furnace. When the temperature of the molten aluminum is 720°C, add 1.0 kg of modifier AlSr10 master alloy and 0.18 kg of refiner AlTi5B master alloy and stir for 1 minute;

[0040] Step 4: GBF nitrogen degassing for 8 minutes;

[0041] Step 5: Manually remove oxides and slag on the surface of molten aluminum;

[0042] Step 6: AlSi7Mg aluminum liquid pouring

[0043] 1. After preheating the mold to 180~250℃, spray a layer of coating agent;

[0044] 2. The mold is preheated to 200~300°C to close the mold and pour aluminum liquid;

[0045] 3. Timing s...

Embodiment 2

[0051] Step 1: Weigh 600 kilograms of AlSi7Mg aluminum ingots and melt them into molten aluminum in a melting furnace with a set temperature of 760°C;

[0052] Step 2: transfer the obtained molten aluminum to the holding furnace at 750-760°C, set the temperature of the holding furnace at 720°C, and cool down the molten aluminum in the holding furnace;

[0053] Step 3: Measure the temperature of the molten aluminum in the holding furnace. When the temperature of the molten aluminum is 720°C, add 0.48 kg of modifier AlSr10 master alloy and 0.09 kg of refiner AlTi5B master alloy and stir for 1 minute;

[0054] Step 4: GBF nitrogen degassing for 8 minutes;

[0055] Step 5: Manually remove oxides and slag on the surface of molten aluminum;

[0056] Step 6: AlSi7Mg aluminum liquid pouring

[0057] 1. After preheating the mold to 180~250℃, spray a layer of coating agent;

[0058] 2. The mold is preheated to 200~300°C to close the mold and pour aluminum liquid;

[0059] 3. Timing ...

Embodiment 3

[0062] Step 1: Weigh 600 kilograms of AlSi7Mg aluminum ingots and melt them into molten aluminum in a melting furnace with a set temperature of 760°C;

[0063] Step 2: transfer the obtained molten aluminum to the holding furnace at 750-760°C, set the temperature of the holding furnace at 720°C, and cool down the molten aluminum in the holding furnace;

[0064] Step 3: Measure the temperature of the molten aluminum in the holding furnace. When the temperature range of the molten aluminum is between 720°C, add 1.2 kg of the modifier AlSr10 master alloy and 0.27 kg of the refiner AlTi5B master alloy and stir for 1 minute;

[0065] Step 4: GBF nitrogen degassing for 8 minutes;

[0066] Step 5: Manually remove oxides and slag on the surface of molten aluminum;

[0067] Step 6: AlSi7Mg aluminum liquid pouring

[0068] 1. After preheating the mold to 180~250℃, spray a layer of coating agent;

[0069] 2. The mold is preheated to 200~300°C to close the mold and pour aluminum liquid;...

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Abstract

The invention relates to a cast AlSi7Mg alloy, which is prepared from the following raw materials in parts by weight: 600 parts of AlSi7Mg, 0.48 to 1.2 parts of modifier and 0.09 to 0.27 parts of refiner. According to the cast AlSi7Mg alloy disclosed by the invention, by modifying and refining molten aluminum before pouring an AlSi7Mg casting, physical performance of the AlSi7Mg casting reaches the optimum state, product stability is greatly increased, and the AlSi7Mg casting has superior performance of high strength, high ductility, good metallographic structure and the like. The invention also provides a modification and refinement method for the cast AlSi7Mg alloy.

Description

technical field [0001] The invention relates to a casting AlSi7Mg and its modification and refinement treatment method. Background technique [0002] Railway catenary components are one of the key components for safe railway operation. Cast aluminum alloy AlSi7Mg has been widely used in catenary components. However, the alloy has a flaky silicon phase in the casting process, which has a great impact on the splitting of the structure. , At the same time, there is also the problem of coarse structure, which eventually leads to the disadvantages of low strength and poor elongation of the casting after pouring, and the mechanical properties of the material cannot be fully utilized. It is easy to cause castings to be scrapped in batches or to fail early during work, which brings huge safety hazards to the safe operation of the railway. How to stably and effectively change the shape of the silicon phase in the cast aluminum alloy AlSi7Mg and refine the α body prompts the comprehen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03
CPCC22C21/04C22C1/026C22C1/03
Inventor 许全起焦荣华
Owner HEBEI SHENGYUE RAILWAY ELECTRIFICATION EQUIP
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