Manufacturing method for Al-Cu-Mg-based aluminum alloy flat ingot
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A manufacturing method and aluminum alloy technology, applied in the field of manufacturing aluminum alloy flat ingots, can solve problems such as poor fracture toughness and poor stress corrosion resistance, achieve qualified internal quality, improve mechanical properties, improve stress corrosion resistance and fracture resistance The effect of toughness
Inactive Publication Date: 2017-08-11
NORTHEAST LIGHT ALLOY CO LTD
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[0004] The present invention aims to solve the technical problems of poor stress corrosion resistance and poor fracture toughness of existing Al-Cu-Mg series alloys, and provides a method for manufacturing Al-Cu-Mg series aluminum alloy flat ingots
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specific Embodiment approach 1
[0024] Embodiment 1: In this embodiment, a method for manufacturing an Al-Cu-Mg series aluminum alloy flat ingot is carried out according to the following steps:
[0025] 1. According to the mass percentage of each element: Mn is 0.65% to 0.75%, Cu is 4.3% to 4.6%, Mg is 1.50% to 1.65%, Zn is 0.10% to 0.12%, Ti is 0.03% to 0.05%, and The remaining Al is weighed as aluminum ingot, Al-Mn master alloy, Cu plate, Mg ingot, Zn ingot and Al-Ti master alloy;
[0026] 2. Put the aluminum ingots and Al-Mn intermediate alloy weighed in step 1 into the resistance reverberatory furnace for melting in sequence. The melting temperature is 700°C-750°C. When half of the melting is done, evenly add Cu plates and Continue to smelt Zn ingots completely, control the temperature at 700°C to 750°C, then carry out slag removal, then add Mg ingots, stir the melt until it is evenly mixed, and cover it with flux, and then take samples for testing at 700°C to 750°C. After passing, use Ar-Cl 2 Refining...
specific Embodiment approach 2
[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 1, according to the mass percentage of each element: Mn is 0.70%, Cu is 4.45%, Mg is 1.60%, Zn is 0.11%, and Ti is 0.03% and the balance of Al weigh aluminum ingot, Al-Mn master alloy, Cu plate, Mg ingot, Zn ingot and Al-Ti master alloy. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, when the temperature of the melt reaches 720° C., add Mg ingots, stir the melt until it is evenly mixed, and cover it with flux. Others are the same as in the first or second embodiment.
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Abstract
The invention provides a manufacturing method for an Al-Cu-Mg-based aluminum alloy flat ingot and relates to the field of manufacturing methods of aluminum alloy flat ingots. The manufacturing method aims at solving the problems that an existing Al-Cu-Mg-based aluminum alloy is poor in stress and corrosion resistance and poor in breaking tenacity. The method comprises the steps of firstly, weighing melting raw materials, secondly, performing melting, thirdly, performing refining and fourthly, performing casting. According to the manufacturing method, by reasonably selecting the melting and casting technological processes, the components of aluminum alloy melt are more uniform and stable; the stress and corrosion resistance and breaking tenacity of an alloy are improved; and by reasonably controlling the three parameters of the speed, the temperature and the water flow in the casting process, the Al-Cu-Mg-based aluminum alloy flat ingot which is free of pull cracks and qualified in internal quality and is used for large-sized aviation is produced and can be widely applied to the field of space flight and aviation.
Description
technical field [0001] The invention relates to the field of manufacturing methods of aluminum alloy flat cast ingots. Background technique [0002] Al-Cu-Mg series aluminum alloy has the characteristics of high tensile strength, toughness and fatigue strength, good heat resistance, good processability and excellent welding performance, and has very broad application prospects, and is currently widely used in aerospace It occupies a very important position in the fields of aircraft, vehicle and weapon industry, especially in the aviation industry, and is one of the main structural materials in the aviation industry. Al-Cu-Mg series alloys belong to heat-treatable and strengthened deformable aluminum alloys, and are mainly used in working environments below 100°C. When the working temperature exceeds 100°C, the performance will decrease due to the sharp coarsening of the strengthening phase. [0003] However, the existing Al-Cu-Mg alloys still have problems such as stress co...
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