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A high-strength cast aluminum-silicon alloy strengthened by cryogenic treatment and its preparation process

A technology of casting aluminum-silicon alloy and cryogenic treatment, which is applied in the field of high-strength casting aluminum-silicon alloy and its preparation technology, and achieves the effects of low technical transformation cost, high application cost performance, and excellent comprehensive mechanical properties

Inactive Publication Date: 2018-04-24
NANJING LONGHAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research and application of cast aluminum alloys are still insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation process characteristics of the high-strength cast aluminum-silicon alloy are:

[0034] Step 1 Use commercially available A356, Al-Si, Al-Cu, Al-Mn, pure Mg, pure Zn, Al-Ni, Al-Cr, pure V, Al-Zr, composite RE and Al-Sr master alloys as raw materials According to the characteristics of the chemical composition of the above-mentioned high-strength cast aluminum-silicon alloy, the ingredients are prepared, and all the prepared raw materials are preheated at 210~250°C in the holding furnace;

[0035] Step 2 Put the clean graphite crucible into the aluminum melting crucible furnace to heat up. After the temperature rises to 500°C and keep it warm for a while, take out the crucible for charging operation;

[0036]Step 3 Put most of the A356 alloy (accounting for 60-75% of the total) on the bottom of the crucible, put Al-Si master alloy on it, and then put Al-Mn, Al-Ni, Al-Cr, pure V and Al-Zr intermediate alloy, and finally place the remaining A356 alloy on th...

Embodiment 1

[0042] The chemical composition (calculated by mass percentage) of high-strength cast aluminum-silicon alloy is: 9% Si, 4.5% Cu, 0.7% Mg, 0.45% Zn, 0.4% Mn, 0.025% Cr, and 0.02% Ni , V is 0.05%, Zr is 0.05%, composite RE is 0.25%, Sr is 0.01%, among which unavoidable impurity elements such as O, S or C, single unavoidable impurity elements <0.05%, the total <0.15%, and the remainder for Al. The preparation process is as described in the specific embodiment above. Subsequently, the cast aluminum-silicon alloy was sampled by wire cutting to obtain a tensile test piece for the national standard tensile test, and the tensile test was performed to obtain the mechanical properties of the alloy as shown in Table 1.

Embodiment 2

[0044] The chemical composition (calculated by mass percentage) of high-strength cast aluminum-silicon alloy is: 11% Si, 6% Cu, 0.8% Mg, 0.55% Zn, 0.5% Mn, 0.035% Cr, and 0.03% Ni , V is 0.1%, Zr is 0.09%, composite RE is 0.35%, Sr is 0.03%, among which unavoidable impurity elements such as O, S or C, single unavoidable impurity elements <0.05%, the total <0.15%, and the rest for Al. The preparation process is as described in the specific embodiment above. Subsequently, the cast aluminum-silicon alloy was sampled by wire cutting to obtain a tensile test piece for the national standard tensile test, and the tensile test was performed to obtain the mechanical properties of the alloy as shown in Table 1.

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Abstract

The invention discloses a high-strength cast aluminium-silicon alloy reinforced via cryogenic treatment, and a preparation method thereof, and belongs to the technical field of aluminium-silicon alloy. The invention also discloses chemical composition of the high-strength cast aluminium-silicon alloy reinforced via cryogenic treatment. The preparation method comprises steps of chemical composition controlling, melting process controlling, casting technology controlling, and cryogenic treatment. The step of cryogenic treatment comprises following steps: solution treatment is carried out for 5 to 6h at 470 to 490 DEG C, and then quenching in hot water of 60 to 90 DEG C is carried out; cryogenic thermal insulation is carried out for 24h at -145 to -165 DEG C, and the temperature of an obtained product is increased to room temperature in the air; aging treatment is carried out for 5 to 6h at 170 to 180 DEG C, and the processed product is cooled to room temperature in the air so as to obtain the high-strength cast aluminium-silicon alloy reinforced via cryogenic treatment. According to the preparation method, cryogenic treatment is capable of increasing solubility of alloy elements in cast aluminium-silicon alloy greatly, and more fine strengthening phases are formed by a plurality of added alloy elements, so that the mechanical properties of the high-strength cast aluminium-silicon alloy are much better than that of other cast aluminium-silicon alloy.

Description

technical field [0001] The invention relates to a cast aluminum-silicon alloy material and a preparation method thereof, in particular to a high-strength cast aluminum-silicon alloy suitable for cryogenic treatment for strengthening and a preparation process thereof. Background technique [0002] Cryogenic treatment is an extension of conventional cold treatment, and refers to a process that uses liquid nitrogen as a cooling medium to treat materials at -130°C and below. As early as the 1950s, research on the properties of ferrous metal materials by cryogenic treatment began. For ferrous metals such as steel, it is generally believed that cryogenic treatment has the following four aspects: 1. Carbide precipitation. A large number of dispersed ultrafine carbides are precipitated on the martensite matrix, which improves the hardness and toughness of the alloy; 2. The change of retained austenite. The residual austenite is decomposed and transformed into martensite, which imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/04C22F1/043
Inventor 刘光磊张令瑜李茂军李玉山魏超万浩司乃潮
Owner NANJING LONGHAO NEW MATERIAL TECH CO LTD
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