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High-strength heat-resistant cast aluminum-copper alloy with low porosity and preparation process

A preparation process and a technology for casting aluminum, applied in the field of high-strength and heat-resistant casting aluminum-copper alloy and preparation process, can solve the problems of inapplicability and large loss of aluminum liquid, and achieve the effects of low porosity, low equipment requirements, and simple operation.

Active Publication Date: 2018-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies and methods have their own limitations. For example, the method of reducing pores and pinholes by multiple refining and slag removal (ZL201510401226.7) will cause a large loss of aluminum liquid; In order to suppress the overflow of H (ZL201310244225.7), only small-scale castings can be processed; while the method of metamorphic treatment using composite microalloying of P, Sb, Bi and other elements (ZL201410683603.6) is only suitable for Al-Si Cast alloys, but not suitable for large-scale, high-strength and heat-resistant Al-Cu cast aluminum alloys

Method used

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  • High-strength heat-resistant cast aluminum-copper alloy with low porosity and preparation process
  • High-strength heat-resistant cast aluminum-copper alloy with low porosity and preparation process
  • High-strength heat-resistant cast aluminum-copper alloy with low porosity and preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The alloy composition is: 0.14% V, 0.08% Zr, Zr / V=0.571, RE0.036 (rare earth Ce), 0.38% Ti, 0.08% B, 6.52% Cu, 0.23% Ag, 0.08% Mg, 0.34% Mn, The balance is Al, and the sum of each component is 100%.

[0047] The smelting and casting process of the alloy follows the following steps: (1) According to the above formula, configure 300kg of the cast aluminum alloy material, wherein Al, Ag, and Mg are pure metals, and the remaining elements are aluminum intermediate alloys, and the surface of the above metals is cleaned. No dust, oil, pure Mg is wrapped tightly with aluminum foil, and then baked at 150-300°C for 1-2 hours; (2) The surface of the tools used for alloy melting and casting needs to be cleaned and pre-painted with zinc oxide paint, and then baked at 150-300°C for 1-2 hours; Dry and preheat at 300°C for 3 to 5 hours, and at the same time, dry and preheat the sand mold in a drying furnace at 200 to 400°C for 2 to 4 hours; (3) first melt pure Al in a melting furnace ...

Embodiment 2

[0050] The alloy composition is: 0.23% V, 0.05% Zr, Zr / V=0.217, RE0.014 (rare earth Y), 0.29% Ti, 0.06% B, 4.84% Cu, 0.52% Ag, 0.32% Mg, 0.27% Mn, The balance is Al, and the sum of each component is 100%.

[0051] The melting and casting process of the alloy is the same as in Example 1.

[0052] The casting body is firstly subjected to 515°C / 12h solution heat treatment, and then 175°C / 4h artificial aging heat treatment. Its room temperature and high temperature tensile properties are shown in Table 1.

Embodiment 3

[0054] The alloy composition is: 0.28% V, 0.04% Zr, Zr / V=0.143, RE0.01 (rare earth Yb), 0.20% Ti, 0.04% B, 7.70% Cu, 0.85% Ag, 0.38% Mg, 0.31% Mn, The balance is Al, and the sum of each component is 100%.

[0055] The melting and casting process of the alloy is the same as in Example 1.

[0056] The casting body is firstly subjected to 530°C / 2h solution heat treatment, and then 185°C / 2h artificial aging heat treatment. Its room temperature and high temperature tensile properties are shown in Table 1.

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Abstract

The invention relates to a high-strength heat-resistant cast aluminum-copper alloy with the low porosity and a preparation process. According to the alloy, the higher Ti and B contents, the high V content and the low Zr content are adopted, and the Zr / V ratio is controlled to be less than or equal to 0.625, so that Zr, Ti and B are synergized to refine grains, the interdendritic hole formation iscontrolled, and the heat cracking resistance of V cannot be reduced due to Zr. Meanwhile, during raw material preparation, tool preparation and smelting processes, on the basis of adopting a high-purity argon and intense agitation combination H-removal process measure, through adding trace of rare earth element RE, the content of the melt H is further reduced, the formation of high-strength heat-resistant cast aluminum-copper alloy casting blow holes and pin holes is controlled, and the performance of a large-scale casting body is improved. The preparation process comprises the steps of smelting and casting the alloy, and carrying out solution and aging treatment on the casting. The high-strength heat-resistant cast aluminum-copper alloy with the low porosity provided by the invention canbe used for preparing the large-scale aluminum-copper alloy casting with the low porosity, a dense structure and no heat cracking, and the casting has favorable mechanical property, heat resistance and cutting processability.

Description

technical field [0001] The invention relates to a low-porosity high-strength heat-resistant cast aluminum-copper alloy and its preparation process, in particular to a low-porosity high-strength heat-resistant cast aluminum-copper alloy suitable for large-scale aluminum alloy parts and its preparation process; Non-ferrous metal material alloying technical field. Background technique [0002] Compared with deformed aluminum alloy materials, aluminum alloy castings have the advantage of low cost, but their bulk mechanical properties are relatively low. Moreover, due to the large number of pores and pinholes in the casting body, the performance of the casting test rods with the same alloy composition is greatly reduced. It is a key technical measure to improve the mechanical properties of the casting body by controlling the pores and pinhole defects of the casting. With the development of aerospace and transportation industries, there is an increasing demand for large-scale, h...

Claims

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Application Information

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IPC IPC(8): C22C21/12C22C1/03C22F1/057
CPCC22C1/026C22C1/03C22C21/12C22F1/002C22F1/057
Inventor 刘志义王建曹靖陈烨柏松
Owner CENT SOUTH UNIV
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