A method for manufacturing high-strength and large-size aluminum alloy flat ingot
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A manufacturing method, large-scale technology
Active Publication Date: 2017-03-22
NORTHEAST LIGHT ALLOY CO LTD
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[0004] The purpose of the present invention is to solve the problems that the alloying degree of the aluminum alloy thick plate prepared in the prior art is low, the strength is lower than 600MPa and cannot be mass-produced, and to provide a method for manufacturing a high-strength and large-size aluminum alloy flat ingot
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specific Embodiment approach 1
[0027] Embodiment 1: This embodiment is a method for manufacturing a high-strength and large-size aluminum alloy flat ingot, which is completed according to the following steps:
[0028] 1. Weighing: 1.7%-2.3% Cu, 1.8%-2.6% Mg, 8.6%-9.6% Zn, 0.08%-0.15% Zr, 0.015%-0.04% Ti, 0.003%-0.008% B by mass fraction Weigh high-purity aluminum ingots, Al-Cu master alloys, pure Mg ingots, pure Zn ingots, Al-Ti-B wires and Al-Zr master alloys with the balance of Al;
[0029] Two, smelting: the high-purity aluminum ingot, Al-Cu master alloy, pure Mg ingot, pure Zn ingot, Al-Zr master alloy and Al-Be master alloy weighed in step 1 are added in the resistance melting furnace, and then Melting at a temperature of 720°C to 760°C and a melting speed of 800kg / h, then adding Al-Ti-B wire, and then under the conditions of a temperature of 720°C to 760°C and a stirring speed of 1m / s to 1.5m / s Stir for 5min to 10min to obtain aluminum alloy melt;
[0030] The total mass ratio of the Al-Be master al...
specific Embodiment approach 2
[0045] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass fraction of Be in the Al-Be master alloy described in step 2 is 4%, and the mass fraction of Al is 96%. Other steps are the same as in the first embodiment.
specific Embodiment approach 3
[0046] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass fraction of Ti in the Al-Ti-B wire described in step 1 is 5%, the mass fraction of B is 1%, The mass fraction of Al is 94%. Other steps are the same as those in Embodiment 1 or 2.
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Abstract
The invention provides a method for manufacturing a large high-strength aluminum alloy slab ingot and relates to a method for manufacturing an aluminum alloy slab ingot. The method aims to mainly solve the problems that according to a method for manufacturing a thick aluminum alloy plate in the prior art, the alloying degree is low, the strength is lower than 600 MPa and large-scale production cannot be achieved. The method comprises the first step of material weighing, the second step of smelting, the third step of refining, the fourth step of preparing of cast melt and the fifth step of obtaining of the large high-strength aluminum alloy slab ingot through forming. According to the large high-strength aluminum alloy slab ingot manufactured through the method, the stipulated proportional elongation stress is 150N / mm<2>-190N / mm<2>, the tensile strength is 195N / mm<2>-245N / mm<2>, and the ductility (cast state) is 1%-7%. The method for manufacturing the large high-strength aluminum alloy slab ingot is provided.
Description
technical field [0001] The invention relates to a method for manufacturing an aluminum alloy flat ingot. Background technique [0002] With the continuous development of aviation aircraft in the direction of large-scale, integrated, lightweight and long-life, the requirements for aluminum alloy materials for the airframe: 1) realize structural weight reduction; 2) structural load-bearing and functional integration; 3) improve the use of the airframe 4) high reliability and maintainability; 5) low manufacturing cost and low maintenance cost. This requires the aluminum alloy to have a combination of high specific strength, specific stiffness, fracture toughness, fatigue resistance, low fatigue crack growth rate and corrosion resistance. It is urgent to develop new aluminum alloys with better comprehensive properties, especially the research reserves of new aluminum alloys in my country are seriously insufficient, and systematic research work on pre-stretched aluminum alloys w...
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