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Aluminum alloy thick plate and preparation method thereof

A technology of aluminum alloy and aluminum alloy ingot, which is applied in metal material coating process, solid-state diffusion coating, coating and other directions, can solve the problems of difficulty in eliminating hydrogen holes, unqualified aluminum alloy thick plate flaw detection, etc. The effect of penetration efficiency, elimination of hole defects, and improvement of pass rate

Active Publication Date: 2022-05-20
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for preparing aluminum alloy thick plates to solve the problem in the prior art that it is difficult to eliminate hydrogen holes during the hot rolling process of aluminum alloy thick plates, which leads to the unqualified flaw detection of aluminum alloy thick plates

Method used

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  • Aluminum alloy thick plate and preparation method thereof
  • Aluminum alloy thick plate and preparation method thereof
  • Aluminum alloy thick plate and preparation method thereof

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preparation example Construction

[0020] In order to solve the above problems, in a typical embodiment of the present invention, a method for preparing an aluminum alloy thick plate is provided. alloy, the preparation method includes the following steps: step S1, casting an aluminum alloy ingot and milling the surface to obtain an ingot to be treated with a thickness of 80-500mm; step S2, performing the first heat preservation on the ingot to be processed, and then performing the first Hot rolling to obtain the first billet; step S3, subjecting the first billet to a second heat preservation and hydrogen permeation treatment to obtain a second billet; step S4, performing a third heat preservation on the second billet, and then performing a second hot rolling, and cooling to obtain an aluminum Alloy thick plate; wherein, the temperature of the first heat preservation < the temperature of the second heat preservation, the time of the first heat preservation < the time of the second heat preservation; the temperatu...

Embodiment 1

[0035] Composition of aluminum alloy thick plate: 4.5wt.% Mg, the rest is Al.

[0036] The size of the ingot is 85 (thick) × 90 × 100mm, and the heat preservation is carried out according to the heat preservation procedure in Table 1. The first hot rolling is through 18 passes of double-rolled hot rolling to 58mm, and the reduction in a single pass is 1.5mm; After rolling through 13 passes to 38.5mm, the reduction in a single pass is 1.5mm, and cooling to obtain a 38.5mm aluminum alloy thick plate. The central section of the aluminum alloy thick plate obtained in Example 1 is sampled for penetrant flaw detection analysis. The flaw detection results are shown in Table 1, and the flaw detection result photos are shown in figure 1 .

Embodiment 2

[0038] Composition of aluminum alloy thick plate: 4.5wt.% Mg, 0.9 wt.% Mn, 0.18 wt.% Fe, 0.12 wt.% Si, 0.02wt.% Ti, and the rest is Al.

[0039] The ingot size is 400mm (thick) × 1600 × 2500mm, heat preservation is carried out according to the heat preservation procedure in Table 1, and the first hot rolling passes through a four-roll hot rolling mill with a work roll diameter of 1050mm for 9 passes to form a 220mm thick slab. The pass reduction is 20mm; after the first hot rolling is completed, high-pressure air holes are formed within 300mm of the side of the ingot. 20mm, cooling to get 120mm aluminum alloy thick plate. The aluminum alloy thick plate prepared in Example 2 was subjected to ultrasonic flaw detection, and the flaw detection result was grade A qualified.

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Abstract

The invention provides an aluminum alloy thick plate and a preparation method thereof. The preparation method comprises the following steps: milling an aluminum alloy cast ingot to obtain a cast ingot to be treated, and then sequentially carrying out first heat preservation, first hot rolling, second heat preservation hydrogen permeation treatment, third heat preservation and second hot rolling to obtain an aluminum alloy thick plate; wherein the temperature of the first heat preservation and the third heat preservation is lower than that of the second heat preservation, and the time of the first heat preservation and the third heat preservation is shorter than that of the second heat preservation; the temperature of the second heat preservation is 460-580 DEG C, and the time of the second heat preservation is 16-300 hours. A high-temperature long-time annealing process is applied in the middle stage of hot rolling of the thick aluminum alloy plate, meanwhile, three heat preservation procedures are set for the thick aluminum alloy plate, and the relation between the temperature and time of the heat preservation procedures in all the stages is limited, so that high-pressure hydrogen in the core of the plate blank permeates into the external atmosphere through a base body; therefore, the hole defect formed by hydrogen gathering in the hot rolling process of the aluminum alloy thick plate is eliminated, and the flaw detection defect qualification rate of the thick plate is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing and manufacturing, in particular to an aluminum alloy thick plate and a preparation method thereof. Background technique [0002] Aluminum alloy thick plates have the characteristics of high specific strength and good corrosion resistance, and are widely used in aerospace, shipbuilding, bridges, offshore platforms, pressure vessels, liquid transportation containers and other fields. Aluminum alloy thick plates, especially high-magnesium aluminum alloy thick plates have high strength due to the addition of magnesium, and are generally used as structural load-bearing parts in key parts, with very high performance requirements. Generally, aluminum alloy thick plates are prepared by hot rolling in large hot roughing mills. Due to the large thickness of the finished plate, it is difficult for the pressure in the hot rolling deformation process to be transmitted to the center of the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C23C8/00B21C37/02C22C21/06
CPCC22F1/04C23C8/00B21C37/02C22C21/06
Inventor 余康才董学光李虎田吴永福李清
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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