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A hypoeutectic aluminum-silicon alloy casting and a process for improving its performance

A technology of casting performance and process method, applied in the field of aluminum alloy casting, can solve the problems of adverse effects of alloy welding performance, poor thermal processing performance, difficult to precisely control components, etc., to achieve full refinement effect, avoid formation and precipitation, Easy-to-use effects

Active Publication Date: 2019-12-27
哈尔滨尚圭科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, due to the poor thermal processing performance of Al-Sr-Ti-B alloy wire, the practical application of the former is difficult to prepare and the composition is difficult to precisely control; while the latter is only refined by B to avoid TiB 2 The appearance of particles, but it affects the refining effect, and the addition of more B will have a negative impact on the welding performance of the alloy, thereby affecting the performance of the casting

Method used

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  • A hypoeutectic aluminum-silicon alloy casting and a process for improving its performance
  • A hypoeutectic aluminum-silicon alloy casting and a process for improving its performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Alloy A was formulated according to the weight percentage in Table 1 above. The specific operation steps are as follows:

[0039] Add pure aluminum to graphite or stainless steel crucible with paint, after it is completely melted, add Al-Si master alloy, wherein the Si content is 5.5-6.5%, stir slowly until fully melted, and then raise the temperature of the melt to 830-900°C , keep warm for 40min; then lower the temperature to 720-750°C, then add 0.25-0.65% Mg in the form of pure metal, 0.05-0.10% Ti in the form of master alloy, and add 0.02-0.10% modifier in the form of master alloy % Sr, and stir evenly, pour high-purity argon, nitrogen or hexachloroethane into the melt for refining and degassing, after refining, let it stand for 10-30min, scrape off the surface scum, and further reduce the melt temperature to 690 ~710°C, then add 0.03~0.08% Ti in the form of Al-Ti-B wire, stir evenly, pour into water-cooled iron mold and metal tensile mold for forming.

[0040] Pu...

Embodiment 2

[0045]Alloy B was formulated according to the weight percentage in Table 1 above. The specific operation steps are as follows:

[0046] Add pure aluminum to graphite or stainless steel crucible with paint, after it is completely melted, add Al-Si master alloy, in which the Si content is 6.5-7.5%, stir slowly until fully melted, and then raise the temperature of the melt to 830-900°C , keep warm for 40min; then lower the temperature to 720-750°C, then add 0.25-0.65% of Mg in the form of pure metal, 0.05-0.10% of Ti in the form of master alloy, and add two kinds of modifiers in the form of master alloy 0.02 ~0.10% Sr and 0.05~0.15% Er, and stir evenly, pass high-purity argon, nitrogen or hexachloroethane into the melt for refining and degassing, after refining, let it stand for 10-30min, and remove the surface floating Slag, the melt temperature is further lowered to 690-710°C, and then 0.03-0.08% Ti is added in the form of Al-Ti-B wire, stirred evenly, poured into water-cooled...

Embodiment 3

[0053] Alloy C was formulated according to the weight percentage in Table 1 above. The specific operation steps are as follows:

[0054] Add pure aluminum to graphite or a stainless steel crucible with paint, after it is completely melted, add Al-Si master alloy, in which the Si content is 7.5-8.5%, stir slowly until fully melted, and then raise the temperature of the melt to 830-900°C , keep warm for 40min; then lower the temperature to 720-750°C, then add 0.25-0.65% Mg in the form of pure metal, 0.05-0.10% Ti in the form of master alloy, and add 0.05-0.40% Ti in the form of master alloy. Sb, and stir evenly, pour high-purity argon, nitrogen or hexachloroethane into the melt for refining and degassing, after refining, let it stand for 10-30 minutes, remove the surface scum, and further reduce the melt temperature to 690-710 ℃, and then add 0.03-0.08% Ti in the form of Al-Ti-B wire, stir evenly and pour it into a water-cooled iron mold and a metal-type tensile mold for formin...

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Abstract

The invention discloses a hypoeutectic Al-Si alloy casting and a technological method for improving the performance of the hypoeutectic Al-Si alloy casting. Alloy components of the hypoeutectic Al-Sialloy casting comprise, by weight, one or several of 5.5-8.5% of Si, 0.25-0.65% of Mg, 0.08-0.2% of Ti, 0.02-0.10% of Sr, 0.05-0.50% of Er and 0.05-0.40% of Sb, less than or equal to 0.12% of impurityelement Fe, less than or equal to 0.05% of other single impurities, less than or equal to 0.15% of total impurities, and the balance Al. In the Al-Si alloy smelting process, a melt is subjected to superheating treatment; in the combination alloying process and the online refining process, Ti elements are added twice; through superheating treatment of the melt and stepped addition of the Ti elements, finer grain crystals or particles are formed in the alloy following cooling and solidifying process, an aluminum matrix and co-crystal Si particles are fully refined in the casting process, and the performance of the alloy is improved. Accordingly, the performance of the casting is greatly improved, and the medium-strength Al-Si alloy casting is applicable to the fields such as aviation, aerospace and automobiles.

Description

technical field [0001] The invention relates to the technology in the field of aluminum alloy casting, in particular to a hypoeutectic aluminum-silicon alloy casting and a process method for improving its performance. Background technique [0002] Hypoeutectic aluminum-silicon alloy has the characteristics of good fluidity, no thermal cracking tendency, and small linear shrinkage. It also has high specific strength and good casting performance. It is widely used in aviation, aerospace, automotive construction and other fields. In the as-cast hypoeutectic aluminum-silicon alloy without modification treatment, the eutectic silicon phase is distributed in the aluminum matrix in the form of coarse needles, and it is very easy to cause stress concentration in these parts during the stress process, resulting in the strength of the alloy, The plasticity is significantly reduced. At present, in industrial production, it is generally adopted to add a modifier to the melt for modific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/04C22F1/043
Inventor 冯立超于雪梅訾克明
Owner 哈尔滨尚圭科技有限公司
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