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Multi-stage hot isostatic pressing method of Cu-containing cast Al-Si-Mg aluminum alloy castings

A technology of aluminum alloy casting and hot isostatic pressing, applied in the field of static pressing, can solve the problems of limited application and unpredictable performance, and achieve the effect of improving the degree of densification, mechanical properties and plasticity.

Active Publication Date: 2020-08-14
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, most of the previous work focused on the loose closure of the casting, but did not conduct a systematic study on the impact of the treatment itself on the structure and performance.
Only one-sided requirement for porosity elimination often fails to achieve the expected performance, which greatly limits the application of hot isostatic pressing technology in high-performance aluminum alloy castings

Method used

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  • Multi-stage hot isostatic pressing method of Cu-containing cast Al-Si-Mg aluminum alloy castings
  • Multi-stage hot isostatic pressing method of Cu-containing cast Al-Si-Mg aluminum alloy castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After the pouring of A336 and A354 alloy castings is completed, after cleaning, the main wall thickness is 40-70mm, and then the hot isostatic pressing process is used: the hot isostatic pressing process is divided into two processes, the first process pressure P 1 is 110MPa, temperature T 1 at 490°C, time t 1 is 1.5h, then enters the second process, the pressure P of the second process 2 is 110MPa, temperature T2 is 530℃, time t 2 for 30min. After the treatment is completed, the pressure is unloaded on the hot isostatic pressing furnace, and the casting is cooled to room temperature with the furnace, and then the casting is subjected to heat treatment and mechanical processing.

Embodiment 2

[0029] After the pouring of A318 and A332 alloy castings is completed, after cleaning, the main wall thickness is 20-40mm, and then the hot isostatic pressing process is used: the hot isostatic pressing process is divided into two processes, the first process pressure P 1 is 100MPa, temperature T 1 at 490°C, time t 1 is 1.5h, then enters the second process, the pressure P of the second process 2 is 100MPa, temperature T 2 at 530°C, time t 2 for 30min. After the treatment is completed, the pressure is unloaded on the hot isostatic pressing furnace, and the casting is cooled to room temperature with the furnace, and then the casting is subjected to heat treatment and mechanical processing.

Embodiment 3

[0031] After the pouring of A333 and A390 alloy castings is completed, after cleaning, the main wall thickness is less than 20mm, and then the hot isostatic pressing process is used: the hot isostatic pressing process is divided into two processes, the first process pressure P 1 90MPa, temperature T 1 at 460°C, time t 1is 1.5h, then enters the second process, the pressure P of the second process 2 is 100MPa, temperature T 2 at 530°C, time t 2 for 30min. After the treatment is completed, the pressure is unloaded on the hot isostatic pressing furnace, and the casting is cooled to room temperature with the furnace, and then the casting is subjected to heat treatment and mechanical processing.

[0032] The density, mechanical properties and elongation of the castings are all improved after the above hot isostatic pressing treatment. The density after hot isostatic pressing is 2.3% higher than that of castings without hot isostatic pressing, the mechanical properties after hot...

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Abstract

The invention relates to a multi-stage hot isostatic pressing method of Cu-containing cast Al-Si-Mg aluminum alloy castings, and belongs to the technical field of machining of aluminum alloy castings.Specifically, hot isostatic pressing treatment is performed after pouring of the Cu-containing cast Al-Si-Mg aluminum alloy castings is completed, the hot isostatic pressing treatment is divided intotwo stages, at the first stage, pressure is P1, a temperature T1 is lower than or equal to a melting temperature of a low-melting-point Cu-containing phase, at the second stage, pressure is P2, a temperature T2 is higher than the melting temperature of the low-melting-point Cu-containing phase and lower than a line temperature of an alloy solid phase, and P2 is larger than or equal to P1. The temperature at the first stage is controlled to be lower than the melting temperature of the copper-rich phase, the temperature is then raised at the second stage, defects of the castings are eliminated,meanwhile the copper-rich phase is prevented from overburning under the conditions of high temperature and high pressure, and the compactness, mechanical property and elongation of the Cu-containingcast Al-Si-Mg aluminum alloy castings subjected to hot isostatic pressing are all effectively improved compared with those of castings not subjected to hot isostatic pressing.

Description

technical field [0001] The invention belongs to the technical field of processing aluminum alloy castings, and in particular relates to a graded hot isostatic pressing method for casting Al-Si-Mg aluminum alloy castings containing Cu. Background technique [0002] Casting defects such as air holes, shrinkage cavities, shrinkage porosity, inclusions, cracks, and surface defects will inevitably occur in castings during casting production. Stress concentration becomes the source of cracks for material fracture and reduces the mechanical properties of materials. [0003] Hot isostatic pressing can eliminate defects in aluminum alloy castings, reduce the porosity of castings, increase the density of castings, and improve the mechanical properties of alloys. The essence of defect healing in the hot isostatic pressing process is a process of tissue creep and diffusion connection under high temperature and high pressure conditions, in which temperature is the most important paramet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 张文达卫振华毛红奎徐宏任霁萍宋彬
Owner ZHONGBEI UNIV
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