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Method for spheroidizing heat treatment of eutectic silicon in eutectic aluminium-silicon alloy

A heat treatment method, eutectic aluminum-silicon technology, which is applied in the field of metal heat treatment, can solve the problems of improving the strength and toughness of eutectic aluminum-silicon alloy, the eutectic silicon shape is not in the best state, and the deterioration effect is poor.

Active Publication Date: 2017-02-01
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Antimony has long-term modification, and it still has the ability to modify after remelting, but the modification effect is poor, and its modification mechanism is different from that of sodium and strontium
[0005] Although the modification of eutectic Al-Si alloys with chemical modifiers can refine eutectic silicon sheets or promote the transformation of sheet-like eutectic silicon into fibrous eutectic silicon, and is widely used, the morphology of eutectic silicon is still not optimal. In the best state, the improvement of the strength and toughness of the eutectic Al-Si alloy is still subject to certain constraints

Method used

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  • Method for spheroidizing heat treatment of eutectic silicon in eutectic aluminium-silicon alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Eutectic Al-Si alloy annealed at 577°C for 1 hour

[0022] An Al-11.7wt.% Si eutectic aluminum-silicon alloy was smelted in a graphite crucible using a well-type electric furnace, and the alloy liquid was poured into a metal mold to obtain a eutectic aluminum-silicon alloy sample with a diameter of 10 mm. The samples were placed in a tubular annealing furnace at 577°C for 1 hour of spheroidizing annealing treatment. After annealing, the samples were taken out for air cooling. The microstructure of the eutectic Al-Si alloy after spheroidizing annealing for 1 hour is as follows: image 3 As shown in (b), it can be seen that after annealing at 577°C for 1 hour, about 30% of the eutectic silicon has been spheroidized.

Embodiment 2

[0023] Example 2: Eutectic Al-Si alloy annealed at 577°C for 2 hours

[0024] An Al-11.7wt.% Si eutectic aluminum-silicon alloy was smelted in a graphite crucible using a well-type electric furnace, and the alloy liquid was poured into a metal mold to obtain a eutectic aluminum-silicon alloy sample with a diameter of 10 mm. The samples were respectively placed in a tubular annealing furnace at 577°C for 2 hours of spheroidizing annealing treatment. After annealing, the samples were taken out for air cooling. The microstructure of the eutectic Al-Si alloy after spheroidizing annealing for 1 hour is as follows: image 3 As shown in (c), it can be seen that after annealing at 577°C for 2 hours, about 50% of the eutectic silicon has been spheroidized.

Embodiment 3

[0025] Example 3: Eutectic Al-Si alloy annealed at 577°C for 3 hours

[0026] An Al-11.7wt.% Si eutectic aluminum-silicon alloy was smelted in a graphite crucible using a well-type electric furnace, and the alloy liquid was poured into a metal mold to obtain a eutectic aluminum-silicon alloy sample with a diameter of 10 mm. The samples were respectively placed in a tubular annealing furnace at 577°C for 3 hours of spheroidizing annealing treatment. After annealing, the samples were taken out for air cooling. The microstructure of the eutectic Al-Si alloy after spheroidizing annealing for 1 hour is as follows: image 3 As shown in (d), it can be seen that after annealing at 577°C for 3 hours, about 95% of the eutectic silicon has been spheroidized.

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Abstract

The invention relates to a method for spheroidizing heat treatment of eutectic silicon in eutectic aluminium-silicon alloy. The method refers to carrying out spheroidizing annealing at the eutectic temperature (577 DEG C) of aluminium-silicon alloy. According to the method, annealing is carried out on the alloy at the eutectic temperature (577 DEG C) of aluminium-silicon alloy to enable needlelike eutectic silicon to have rapid balling; and the method is a simple and effective method for spheroidizing heat treatment of eutectic silicon to improve the mechanical property of eutectic aluminium-silicon alloy.

Description

technical field [0001] The field of the invention belongs to the field of metal heat treatment, and in particular relates to a spheroidizing heat treatment method of eutectic aluminum-silicon alloy eutectic silicon. Background technique [0002] Aluminum-silicon alloys are widely used in the piston manufacturing industry because of their advantages such as low density, high specific strength, good thermal stability, good wear resistance and corrosion resistance, small thermal expansion coefficient, and good high-temperature performance. [0003] In conventional cast aluminum-silicon alloys, the mechanical properties of the aluminum-silicon alloy are deteriorated due to the presence of needle-shaped eutectic silicon and coarse primary silicon with complex shapes. Technological workers and industries often use modification treatment to improve the microscopic morphology of primary silicon and eutectic silicon phases in aluminum-silicon alloys, so that they can be evenly distri...

Claims

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Application Information

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IPC IPC(8): C22F1/043C22C21/04
CPCC22C21/04C22F1/043
Inventor 王建华朱家庆苏旭平刘亚涂浩
Owner CHANGZHOU UNIV
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