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Heat treatment strengthening and toughening method for hypoeutectic Al-Si-Cu-Mg casting alloy with low energy consumption and high copper content

An al-si-cu-mg, casting alloy technology, applied in the field of high-performance cast aluminum alloy, can solve the problem of not being able to greatly reduce energy consumption, and achieve the effects of improving aging treatment efficiency, reducing energy consumption, and increasing vacancy concentration

Inactive Publication Date: 2021-11-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that the first-stage solution temperature of the existing two-stage solution treatment process is generally higher than 495°C, and the second-stage solution temperature is even higher, which still cannot greatly reduce energy consumption and achieve both mechanical properties and energy consumption.

Method used

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  • Heat treatment strengthening and toughening method for hypoeutectic Al-Si-Cu-Mg casting alloy with low energy consumption and high copper content
  • Heat treatment strengthening and toughening method for hypoeutectic Al-Si-Cu-Mg casting alloy with low energy consumption and high copper content
  • Heat treatment strengthening and toughening method for hypoeutectic Al-Si-Cu-Mg casting alloy with low energy consumption and high copper content

Examples

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Effect test

Embodiment 1

[0024] The hypoeutectic high copper content Al-Si-Cu-Mg casting alloy selected in this embodiment is formed by melting high-purity Al, high-purity Mg and Al-50Cu, Al-20Si, Al-10Sr master alloys, and its The weight percentage and chemical composition are: Si 6.90%, Cu 2.97%, Mg 0.51%, Sr 0.02%, Fe 0.10%, and the balance is Al.

[0025] The invention provides a method for heat treatment strengthening and toughening of a hypoeutectic high copper content Al-Si-Cu-Mg casting alloy with low energy consumption, which comprises the following steps:

[0026] (1) The hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content is subjected to two-stage solution treatment. The first-stage solution is kept at 475°C for 4 hours, and the second-stage solution is at 515°C. Keep warm for 2h under the condition;

[0027](2) Quenching the hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content after two-stage solution treatment in warm water at 70°C;

[0028] (3) The quenched hypoe...

Embodiment 2

[0030] In this embodiment, the composition of the hypoeutectic high copper content Al-Si-Cu-Mg casting alloy is the same as in Example 1, and the present invention provides a low energy consumption hypoeutectic high copper content Al-Si-Cu-Mg casting alloy The heat treatment toughening method, it comprises the steps:

[0031] (1) The hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content is subjected to two-stage solution treatment. The first-stage solution is kept at 475°C for 8 hours, and the second-stage solution is at 515°C. Keep warm for 4h under the condition;

[0032] (2) Quenching the hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content after two-stage solution treatment in warm water at 70°C;

[0033] (3) The quenched hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content is immediately aged at 175° C. for 8 hours.

Embodiment 3

[0035] In this embodiment, the composition of the hypoeutectic high copper content Al-Si-Cu-Mg casting alloy is the same as in Example 1, and the present invention provides a low energy consumption hypoeutectic high copper content Al-Si-Cu-Mg casting alloy The heat treatment toughening method, it comprises the steps:

[0036] (1) The hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content is subjected to two-stage solution treatment. The first-stage solution is kept at 475°C for 4 hours, and the second-stage solution is at 525°C. Keep warm for 2h under the condition;

[0037] (2) Quenching the hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content after two-stage solution treatment in warm water at 70°C;

[0038] (3) Immediately aging the quenched hypoeutectic Al-Si-Cu-Mg casting alloy with high copper content at 175°C for 8 hours.

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Abstract

The invention provides a heat treatment strengthening and toughening method for a hypoeutectic Al-Si-Cu-Mg casting alloy with low energy consumption and high copper content. The hypoeutectic Al-Si-Cu-Mg casting alloy comprises the chemical ingredients of, in percentage by weight, 6.5-7.5% of Si, 2.7-3.3% of Cu, 0.45-0.55% of Mg, 0.02-0.03% of Sr, less than 0.15% of Fe and the balance of Al. According to the heat treatment strengthening and toughening method for the hypoeutectic Al-Si-Cu-Mg casting alloy with the low energy consumption and the high copper content, two-stage solid solution is adopted for the hypoeutectic Al-Si-Cu-Mg casting alloy with the high copper content, the contradictory problem that a second phase is overburnt and dissolved in a matrix in a traditional solid solution system is solved, the high obdurability of the alloy is guaranteed, and meanwhile, the energy consumption is reduced. Compared with T6 heat treatment, the heat treatment method disclosed by the invention has the advantages that the energy consumption is reduced by about 10% when the heat treatment is performed on the hypoeutectic Al-Si-Cu-Mg casting alloy with the high copper content, and the obdurability of the hypoeutectic Al-Si-Cu-Mg casting alloy is also improved.

Description

technical field [0001] The invention belongs to the technical field of high-performance cast aluminum alloys, in particular to the fields of complex structural castings for automobile manufacturing, rail transit and aerospace that require high strength, toughness and low energy consumption, and specifically relates to a hypoeutectic Al-Si with low energy consumption and high copper content - Heat treatment strengthening and toughening method of Cu-Mg casting alloy. Background technique [0002] Energy saving and emission reduction is one of the trends in the development of science and technology today. Under the requirements of low energy consumption and low emission trends, various structural parts are also developing in the direction of lightweight. Due to many advantages such as low density, good casting performance and corrosion resistance, Al-Si alloy has broad application prospects in the fields of automobile manufacturing, rail transit and aerospace. However, becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/043C22C1/03C22C21/02
CPCC22F1/043C22F1/002C22C1/03C22C1/026C22C21/02
Inventor 徐聪卢广玺关绍康杨绪锋郭耀坤
Owner ZHENGZHOU UNIV