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Alar electromagnetic hardening method

An aluminum-silicon alloy and aluminum-silicon-based technology, which is applied in the field of electromagnetic quenching and tempering of aluminum-silicon alloys, can solve problems such as inability to apply, unstable effect, etc., and achieve the effects of easy mastery, simple operation, and simple quenching and tempering method.

Inactive Publication Date: 2005-04-13
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Vibration and stirring technology is still in the stage of laboratory research, the effect is unstable and cannot be applied in production

Method used

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  • Alar electromagnetic hardening method
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  • Alar electromagnetic hardening method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Example 1: Take A356 alloy billet as raw material, put it into a resistance furnace and heat it, the melting temperature is 800°C, set the number of turns of the electromagnetic coil to 100 turns, the speed of the casting machine is 130mm / min, the frequency of the magnetic field is determined to be 30Hz, and the current intensity is 10000 ampere-turns , when the casting temperature is 720 ℃, the ingot is obtained by horizontal continuous casting.

[0029] The results are compared to figure 1 , figure 2 Shown:

[0030] (1) Comparing low-frequency electromagnetic casting with casting without low-frequency electromagnetic field, it is concluded that low-frequency electromagnetic casting can refine grains and obtain fine α-Al structure and eutectic structure.

[0031] (2) Applying a low-frequency electromagnetic field can increase the intragranular content of silicon in aluminum, narrow the eutectic region and grain boundaries, and make the distribution of silicon more u...

example 2

[0032] Example 2: Lay silicon particles (particle size 10-40mm) on the bottom of a graphite crucible, press it with pure aluminum blocks, heat up to 900°C, melt the aluminum and keep it warm for 3 hours, fully stir to completely dissolve the silicon in the aluminum solution . The number of turns of the electromagnetic coil is set to 100 turns, the speed of the casting machine is 100mm / min, the frequency of the magnetic field is determined to be 50Hz, the strength of the magnetic field is 15000 ampere-turns, and the casting temperature is 710°C, and the ingot is obtained by horizontal continuous casting.

[0033] The results are compared to image 3 , Figure 4 , Figure 5 , Figure 6 Shown:

[0034] (1) The α-Al dendrites without electromagnetic field are coarse and uneven; the α-Al dendrites with electromagnetic field are fine and uniform.

[0035] (2) The grain size of eutectic Si without electromagnetic field is large and uneven, and some parts grow in clusters; the gr...

example 3

[0036] Example 3: Using Al-20Si master alloy as raw material, heat to 1000°C and keep it warm for 30min. The number of turns of the electromagnetic coil is set to 100 turns, the speed of the casting machine is 70mm / min, the magnetic field frequency is determined to be 15Hz, the current intensity is 20,000 ampere-turns, and the casting temperature is 840°C, and the ingot is obtained by horizontal continuous casting.

[0037] The results are compared to Figure 7 , Figure 8 Shown:

[0038] (1) For hypereutectic Al-Si alloys, low-frequency electromagnetic casting can refine primary silicon particles and change their morphology.

[0039] (2) Electromagnetic casting can significantly refine the eutectic structure of hypereutectic Al-Si alloy, resulting in significant modification.

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PUM

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Abstract

The electromagnetic Al-Si alloy quenching and tempering process includes the following steps: smelting Al-Si alloy at 800-1000 deg.c; adding other alloy elements, if necessary, and raising the temperature to 740-840 deg.c to deair the alloy elements; casting in a semi-continuous casting machine at the temperature 80-150 deg.c higher than the liquid line and the casting speed of 70-130 mm / min while applying low frequency electromagnetic field of 15-50 Hz and magnetic field strength of 10000-20000 ampere-turns. The electromagnetic Al-Si alloy quenching and tempering method has the advantages of simple process, obvious quenching and tempering effect of fining both the symbiotic crystal structure and initial crystal structure, very low cost and easy application in industrial production.

Description

technical field [0001] The invention relates to the forming of metal materials, in particular to an aluminum-silicon alloy electromagnetic tempering method. Background technique [0002] Aluminum-silicon alloy is the most widely used alloy material in casting aluminum alloys. It has small bulk density, high strength, and [0003] With a series of advantages such as good formability and excellent processing performance, it has become one of the most valued structural materials in the manufacturing industry. However, the eutectic silicon in the aluminum-silicon alloy structure is in the form of coarse flakes, and the size, shape and distribution of the silicon phase are poor, which severely splits the matrix and reduces the strength and plasticity of the alloy. This problem increases with the increase of Si content. more prominent. Changing the morphology of the silicon phase and reducing its weakening effect on the properties of the matrix is ​​an effective way to improve t...

Claims

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Application Information

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IPC IPC(8): B22D27/02
Inventor 崔建忠秦克于福晓
Owner NORTHEASTERN UNIV
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