Method for eliminating coarse grain rings of aluminum alloy bar used for spaceflight
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A technology of aluminum alloy and coarse-grained rings, which is applied in the field of aluminum alloy rods for aerospace, to achieve the effects of eliminating coarse-grained ring defects, excellent comprehensive mechanical properties, and optimizing the heat treatment system
Inactive Publication Date: 2020-04-10
NORTHEAST LIGHT ALLOY CO LTD
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Problems solved by technology
[0003] The present invention aims to solve the technical problem that the coarse-grained rings of aerospace rods produced by extruding in the exi
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specific Embodiment approach 1
[0023] Specific implementation mode 1: This implementation mode is a method for eliminating coarse-grained rings of aluminum alloy rods for aerospace, and the described method is carried out according to the following steps:
[0024] 1. According to the mass percentage of elements, Mg: 1.7%~2.3%, Si≤0.2%, Fe≤0.3%, Cu: 3.8%~4.3%, Mn: 0.40%~0.9%, Ti≤0.1%, Zn≤0.1 % and the balance Al weigh aluminum ingots, Mg ingots, Al-Cu master alloys and Al-Mn master alloys, and then carry out melting and casting to obtain aluminum alloy ingots;
[0025] 2. Put the aluminum alloy ingot obtained in step 1 into a resistance heating furnace, heat it to a temperature of 440-460° C., and extrude it with an aluminum alloy rod mold to obtain an aluminum alloy rod wool;
[0026] 3. Heating the aluminum alloy bar material obtained in step 2 to 430-450°C, keeping it warm for 3-3.5 hours, then cooling it down to below 270°C, and performing annealing treatment;
[0027] 4. Carry out end treatment to the ...
specific Embodiment approach 2
[0033] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the mass percentages of elements are Mg: 2.03%, Si: 0.05%, Fe: 0.16%, Cu: 3.81%, Mn: 0.63% , Ti: 0.02%, Zn: 0.02% and the balance Al for melting and casting. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the melting and casting temperature in Step 1 is 700-750°C. Others are the same as in the first or second embodiment.
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Abstract
The invention discloses a method for eliminating coarse grain rings of an aluminum alloy bar used for spaceflight, relates to the field of methods for aluminum alloy bars for used spaceflight, and aims to solve the technical problem that the coarse grain rings of the bar used for spaceflight extruded and prepared by the existing process exceeds the standard requirement. The method comprises the steps of 1, casting an aluminum alloy cast ingot; 2, heating and extruding the cast ingot; 3, annealing; 4, end treatment; 5, carrying out over-mold cold drawing; 6, quenching; 7, stretching and straightening; and 8, carrying out roller type straightening, and the aluminum alloy bar, used for spaceflight, under the situation of eliminating the coarse grain rings is prepared. The aluminum alloy bar prepared through the method can be free of coarse grain rings, and the standard requirement is met; the mechanical property further meets the application requirements of spaceflight products; and the method is used for preparing the aluminum alloy bar used for spaceflight.
Description
technical field [0001] The invention relates to the field of aluminum alloy bar materials used in aerospace. Background technique [0002] The parts in our country's fighter jet series need new alloy rods, which are irreplaceable because of their alloy properties. Since the alloy parts are used under high temperature conditions, the conditions are harsh, and the performance and low-fold structure are strictly required. While ensuring the mechanical properties It is especially required that the coarse crystal ring is ≤2mm. However, at present, the bar produced according to the original process has a minimum depth of 2.5mm until the head end of the coarse-grained ring, which does not meet the requirements of the standard for the coarse-grained ring ≤ 2mm, which cannot meet the needs of its application. Contents of the invention [0003] The invention solves the technical problem that the coarse-grained rings of aerospace rods produced by extruding in the prior art exceed st...
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