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A kind of preparation method of grained hypereutectic al Si alloy
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A hypereutectic and alloy technology, which is applied in the field of preparation of new grained hypereutectic Al-Si alloys, can solve the problems of no substantive progress and achieve the effects of convenient operation, simple process and easy realization
Active Publication Date: 2017-06-16
青岛六点轴承科技有限公司
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[0006] In the hypereutectic Al-Si alloy under special casting conditions, the primary silicon does not reach the degree of spherical shape, but its elongation can occasionally reach 15%, indicating that the hypereutectic Al-Si alloy has the potential for high elongation, but So far no substantial progress has been made to achieve high elongation stably in hypereutectic Al-Si alloys
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Embodiment 1
[0019] Al-20% Si alloy, modified with 0.1% P, Zr content 3.0%.
[0020] (1) Melting a hypereutectic Al-Si alloy with a Si content of 20%, heating to 1000°C, refining, and standing still for 10 minutes; adding 0.1% of the mass of the hypereutectic Al-Si alloy for modification treatment, stirring, Keep warm for 10 minutes.
[0021] (2) Adding Al-Zr alloy, controlling the addition amount of Zr to be 3.0% of the total weight of the Al-Si alloy, and keeping the temperature for 25 minutes; carrying out the second refining, and keeping the temperature for 15 minutes.
[0022] (3) When the temperature of the solution drops to 850°C, it is poured into a water-cooled metal mold, and the solidification structure is as follows: figure 1 shown.
Embodiment 2
[0024] Al-25% Si alloy, with 0.1% P modifier, Zr content 3.0%.
[0025] (1) Melting a hypereutectic Al-Si alloy with a Si content of 25%, heating to 1100°C, refining, and standing still for 10 minutes; adding P that accounts for 0.1% of the mass of the hypereutectic Al-Si alloy for modification, stirring, and heat preservation 15min.
[0026] (2) Adding Al-Zr alloy, controlling the addition amount of Zr to be 3.0% of the total weight of the Al-Si alloy, and keeping the temperature for 20 minutes; carrying out the second refining, and keeping the temperature for 15 minutes.
[0027] (3) When the temperature of the solution drops to 900°C, it is poured into a water-cooled metal mold, and the solidification structure is as follows: figure 2 shown.
Embodiment 3
[0029] Al-20% Si alloy, modified with 0.1% P, Zr content 3.5%.
[0030] (1) Melting the hypereutectic Al-Si alloy with a content of 20%, heating to 1000°C, refining, and standing still for 10 minutes; adding 0.1% of the mass of the hypereutectic Al-Si alloy for modification treatment, stirring, and holding for 10 minutes .
[0031] (2) Adding Al-Zr alloy, controlling the addition amount of Zr to be 3.5% of the total weight of the Al-Si alloy, keeping the temperature for 25 minutes; carrying out the second refining, and keeping the temperature for 15 minutes.
[0032] (3) When the temperature of the solution drops to 850°C, it is poured into a water-cooled metal mold, and the solidification structure is as follows: image 3 shown.
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Abstract
A preparation method for novel pelletized hypereutectic Al-Si alloy includes the steps that (1) hypereutectic Al-Si alloy with the content of Si being 15-30% is melted, is heated to 1000-1100 DEG C, is refined and stands still for 10-15 min, P accounting for 0.1% of the mass of the hypereutectic Al-Si alloy is added for modification and stirred, and the temperature is kept for 10-15 min; (2) Al-Zr alloy is added, the addition amount of Zr is controlled to account for 2.5-3.5% of the total weight of the Al-Si alloy, and the temperature is kept for 20-30 min; secondary refining is carried out, and the temperature is kept for 10-15 min; and (3) the molten alloy is poured into a water-cooling metal profile after the temperature is reduced to 800-900 DEG C. The preparation method for the novel pelletized hypereutectic Al-Si alloy is simple in process, convenient to operate and easy to realize, and eutectic silicon in the condensation structure of the prepared hypereutectic Al-Si alloy is shaped like fine particles.
Description
technical field [0001] The invention belongs to a method for preparing an aluminum alloy material, in particular to a method for preparing a novel granulated hypereutectic Al-Si alloy. Background technique [0002] Hypereutectic Al-Si alloy has the characteristics of low density, high hardness, high temperature resistance, wear resistance, and low thermal expansion coefficient. It is most suitable for manufacturing high-performance automotive engine cylinders, pistons and other parts, so it has been valued since its appearance , and developed very rapidly. In the past ten years, many new technologies such as modification treatment and external field treatment have been formed, which have brought hypereutectic Al-Si alloys closer to practical applications. [0003] Due to the presence of bulk primary silicon in the hypereutectic Al-Si alloy structure, the material is very brittle and cannot be used directly. In order to make this excellent material applicable, people began ...
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