Super-thick aluminum alloy quenched plate and preparation method thereof

Abstract

The invention discloses a super-thick aluminum alloy quenched plate and a preparation method thereof. The aluminum alloy quenched plate comprises the following alloy elements in percentage by mass: less than or equal to 0.25% of Si, less than or equal to 0.3% of Fe, 0.23-0.28% of Cu, less than or equal to 0.1% of Mn, 1.0-1.15% of Mg, 0.19-0.23% of Cr, less than or equal to 0.01% of Zn, 0.02-0.03% of Ti and the balance of Al. Raw materials of an aluminum ingot, Al-Cu75, a pure magnesium ingot, Al-Cr75, a Zn alloy ingot and 5Ti-1B are sequentially subjected to smelting, refining, casting, head sawing, surface milling, soaking treatment, hot rolling, quenching and aging treatment procedures, and the super-thick aluminum alloy quenched plate is prepared. The obtained product has good tensile strength, yield strength, hardness and ductility, and therefore the high strength, high hardness, impact resistance and other performance of the aluminum alloy super-thick plate are effectively improved.

Description

First, the technical field: [0001] The present invention belongs to the field of aluminum alloy technology, specifically relates to an ultra-thick aluminum alloy quenching plate and a preparation method thereof. Second, the background technology: [0002] Aluminum alloy quenching plate has advantages: 1, light weight. Because the density of the aluminum alloy quenching plate is only about 36% of the general steel, the motion inertia is relatively low; the acceleration and deceleration speed in the production process is relatively easy, so it can reduce the loss of the machine and the mold workpiece. 2. Easy machining and high dimensional stability. The cutting speed of aluminum alloy quenching plate is more than 6 times faster than that of general steel, so it can greatly reduce the processing time of the workpiece and make the workpiece produce faster. 3. Excellent thermal conductivity. The thermal conductivity of the aluminum alloy quenching plate is higher than that of genera...

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Problems solved by technology

[0003] However, due to the immature production process, impenetrable quenching, and over-aging of aluminum alloy quenched plates with a thickness of more than 200mm, the hardness of the upper and lower sides of the plate is uneven, and the performance of the surface and the core is greatly different, which affects the normal use in the later period. there is still a certain gap

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