High-pressure harmonization processing method of eliminating 700 line aluminium alloy cast ingot crystallization phase
A technology of homogenization treatment and aluminum alloy ingot casting, which is applied in the field of homogenization heat treatment to achieve the effects of increased homogenization temperature, high aging strength and elimination of adverse effects
Active Publication Date: 2007-11-14
溧阳常大技术转移中心有限公司
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Problems solved by technology
[0005] The present invention is aimed at the problem that the casting crystal phase of 7000 series aluminum alloy with high alloying degree is difficult to be fully eliminated through the existing homogenization treatment process. Heat treatment, so as to achieve the purpose of quickly and fully eliminating the crystalline phase of the ingot
[0008] The main purpose of preheating is to properly improve the plasticity of the ingot and prevent the ingot from cracking when the top pressure mold is pressurized.
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[0027] The experimental material is a chilled cast 7000 series aluminum alloy ingot, and its chemical composition is Al-12Zn-3.5Mg-3.0Cu-0.14Zr (mass percentage). Figure 2 is a scanning electron micrograph of the as-cast structure. It can be seen from the figure that there are a large number of non-equilibrium crystal phases in the matrix. These non-equilibrium crystalline phases mainly appear as lamellar eutectics. X-ray diffraction analysis shows that these crystalline phases are η phases, as shown in Figure 3.
[0028] The ingot was machined into a round bar-shaped sample with a diameter of 10 mm and a height of 12 mm. The sample was preheated to 350°C by using a 420-bore six-sided roof synthesis device, and kept for 30 minutes, then an isostatic pressure of 5 GPa was applied, and then the temperature was raised to 750°C, kept for 45 minutes, and then cooled to room temperature under pressure. The microstructure after high-pressure homogenization treatment is shown in Fig...
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Abstract
The invention relates to a method of homogenizing heat treatment to eliminate the 7000 series aluminum alloy ingot casting crystallization phase, namely exerting the higher static pressure to the ingot casting at the same time carrying on homogenizing processing. The method comprising four stages of the ingot casting preheating, pressurizes, homogenizing processing, and cools. Preheating temperature range is 250-450 Deg. C, the soaking time is about 10min-2h, and the low exerting pressure limit is no less than 500MPa, while homogenizing temperature is in 500-850 Deg. C, soaking time is about 15min-2h. Also may adopt the maintenance homogenizing pressure, until the ingot casting cools the belt presses cooling, or the belt pressure cools to the aluminum alloy atmospheric pressure below fusion temperature, and again carries on the release pressure to cool two different ways. Based on the characteristic of the aluminum alloy fusion temperature increased under the high pressure function, this invention adopts a higher temperature to carry on the homogenizing heat treatment, thereby realizes the aim of fast and fully eliminating the ingot casting crystallization phase.
Description
technical field [0001] The invention relates to a homogenization heat treatment method for eliminating crystal phases of 7000 series aluminum alloy casting ingots, that is, performing homogenization treatment while applying high isostatic pressure to the ingots. Background technique [0002] The 7000 series aluminum alloy belongs to a type of wrought aluminum alloy that can obtain the highest aging strengthening effect. It has the characteristics of low density, high strength, and good processing performance, and has become an important structural material in the aviation field. This series of alloys mainly contain elements such as Zn, Mg and Cu, among which Zn and Mg age and precipitate fine and dispersed GP regions, η' metastable phases and η equilibrium phases, which directly determine the strength performance; the main function of Cu is to improve stress corrosion resistance. and strength. In order to further improve the strength of 7000 series ultra-high-strength alumi...
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IPC IPC(8): C22F1/04
Inventor 李海曹大呼王芝秀
Owner 溧阳常大技术转移中心有限公司