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Aluminum alloy thick plate and preparation method thereof

An aluminum alloy and aluminum alloy ingot casting technology, which is applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve problems such as hydrogen gas holes are difficult to eliminate, and aluminum alloy thick plate flaw detection is unqualified, so as to improve hydrogen The effect of penetration efficiency, elimination of hole defects, and improvement of pass rate

Active Publication Date: 2022-07-19
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, cast and mill the aluminum alloy ingot to obtain a to-be-treated ingot with a thickness of 80-500 mm; Step S2, firstly heat the to-be-treated ingot, and then perform a first Hot rolling to obtain a first billet; Step S3, subjecting the first billet to a second heat preservation and hydrogenation treatment to obtain a second billet; Step S4, subjecting the second billet to a third heat preservation, and then to second hot rolling, and cooling to obtain aluminum Alloy thick plate; wherein, the temperature of the first heat preservation

Embodiment 1

[0035] Aluminum alloy thick plate composition: 4.5wt.% Mg, the rest is Al.

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

Embodiment 2

[0038] Aluminum alloy thick plate composition: 4.5 wt.% Mg, 0.9 wt.% Mn, 0.18 wt.% Fe, 0.12 wt.% Si, 0.02 wt.% Ti, and the rest are Al.

[0039] The size of the ingot is 400mm (thickness) × 1600 × 2500mm, and the heat preservation is carried out according to the heat preservation procedure in Table 1. The first hot rolling is hot rolled by a four-high hot rolling mill with a work roll diameter of 1050 mm for 9 passes into a 220 mm thick slab. The pass reduction is 20mm; after the first hot rolling is completed, a high-pressure air hole is formed within 300mm of the side of the ingot. After heat preservation according to the program, continue to hot-roll 5 passes to a 120mm thick plate, and the single pass reduction is 20mm, and cooled to obtain a 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 includes: casting and milling an aluminum alloy ingot to obtain an ingot to be treated, and then performing first heat preservation, first hot rolling, second heat preservation and hydrogen permeation treatment, third heat preservation and second hot rolling in sequence to obtain the aluminum alloy Thick plate; wherein, the temperature of the first heat preservation and the third heat preservation are both lower than the temperature of the second heat preservation, and the time of the first heat preservation and the third heat preservation are both less than the time of the second heat preservation; the temperature of the second heat preservation is 460~580 ℃, And the time of the second heat preservation is 16~300h. In the present invention, a high temperature and long-term annealing process is applied in the middle stage of hot rolling of the aluminum alloy thick plate, and at the same time, three-stage heat preservation procedures are set for the aluminum alloy thick plate, and the relationship between the temperature and time of the heat preservation procedures in each stage is limited, so that the core of the slab can be The high-pressure hydrogen penetrates into the external atmosphere through the matrix, thereby eliminating the hole defects formed by the accumulation of hydrogen during the hot rolling of aluminum alloy thick plates, and improving the pass rate of thick plate flaw detection defects.

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 elements, and are generally used as structural load-bearing parts in key parts, and their performance requirements are very high. Generally, aluminum alloy thick plates are prepared by hot rolling in large hot roughing mills. Due to the large thickness of the finished sheet, it is difficult for the pressure to be transmitted to the core of the thick plate during hot...

Claims

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Application Information

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Patent Type & Authority Patents(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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