Treatment method of 2-series aluminum alloy plate

Abstract

The invention belongs to the technical field of metal material processing, and provides a treatment method of a 2-series aluminum alloy plate. The method comprises the following steps: sequentially carrying out solution treatment and quenching treatment on a 2-series aluminum alloy plate to obtain a quenched plate; the quenched plate is subjected to first rolling after being subjected to subzero treatment, and a primary rolled plate is obtained; and the primary rolled plate is subjected to heat preservation treatment and then subjected to secondary rolling, aging treatment is conducted after secondary rolling is completed, and the treated 2-series aluminum alloy plate is obtained. According to the method, the two-stage pre-deformation method of first rolling and second rolling is adopted for treating the 2-series aluminum alloy plate, the strength and toughness of the 2-series aluminum alloy plate are greatly improved, meanwhile, the method is easy to operate, and industrialization can be well achieved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, and in particular to a method for processing a 2-series aluminum alloy plate. Background Art

[0002] Due to its excellent comprehensive properties, such as low density, easy processing, excellent forming and welding properties, 2 series aluminum alloys are favored in modern aerospace, transportation and defense military fields, and are one of the main structural materials for lightweight applications. For related components, the key to achieving lightweight and good forming effects lies in how to further improve the strength and toughness of 2 series aluminum alloy sheets.

[0003] Therefore, it is of great significance to develop a 2 series aluminum alloy sheet with higher strength and toughness. Summary of the invention

[0004] In view of this, the present invention provides a method for processing a 2-series aluminum alloy plate to solve the problem of poor strength and toughness of the existing 2-series aluminum alloy plate.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a method for processing a 2-series aluminum alloy plate, comprising the following steps:

[0007] 1) subjecting the 2 series aluminum alloy sheet to solution treatment and quenching treatment in sequence to obtain a quenched sheet;

[0008] 2) subjecting the quenched plate to a deep cryogenic treatment and then to a first rolling to obtain a first rolled plate;

[0009] 3) After the first rolled plate is subjected to heat preservation treatment, a second rolling is performed, and after the second rolling is completed, an aging treatment is performed to obtain a treated 2 series aluminum alloy plate.

[0010] Preferably, the temperature of the solution treatment in step 1) is 480-550° C. and the time is 0.5-6 h; and the quenching treatment is water quenching.

[0011] Preferably, the temperature of the cryogenic treatment in step 2) is -100 to -196°C, and the time is 0.2 to 3 hours.

[0012] Preferably, in step 2), liquid nitrogen is used to cool the quenched plate during the first rolling process; and the reduction amount of the first rolling is 2-15%.

[0013] Preferably, the temperature of the heat preservation treatment in step 3) is 20-300°C and the time is 0.2-4h; the reduction amount of the second rolling is 2-15%.

[0014] Preferably, the aging treatment in step 3) is carried out at a temperature of 130 to 200° C. and for a time of 6 to 48 hours.

[0015] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention treats the 2-series aluminum alloy sheet by adopting a double-stage pre-deformation method of the first rolling and the second rolling, which is conducive to starting different slip systems, making the strengthening phase precipitated from the 2-series aluminum alloy finer and more dispersed, greatly improving the strength of the 2-series aluminum alloy sheet, and the method of the present invention forms pinned dislocations through deep cold deformation, and the heating and heat preservation treatment can reduce the critical shear stress of the aluminum alloy slip system, and more slip systems can be started during the second rolling pre-deformation, thereby making the aluminum alloy deformation more uniform; at the same time, the treatment method of the present invention also improves the elongation of the 2-series aluminum alloy sheet, making it have higher toughness. In addition, the treatment method of the present invention is simple to operate, and its process is easy to master and implement. In the actual application process, it can provide strong support for industrial production, has good industrial realization conditions, can effectively promote the industrialization process, and achieve ideal industrial production effects. Moreover, the treatment method of the present invention can also be applied to treat other alloys with strain-induced precipitation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is a graph showing the mechanical properties test results of 2519 aluminum alloy sheet 1, 2519 aluminum alloy sheet 2, 2519 aluminum alloy sheet 3 and 2519 aluminum alloy sheet 4 obtained in Examples 1 to 2 and Comparative Examples 1 to 2;

[0019] Figure 2 This is a microstructure diagram of the 2519 aluminum alloy plate 1 obtained by processing in Example 1;

[0020] Figure 3 This is the microstructure diagram of the 2519 aluminum alloy plate 3 obtained in Comparative Example 1. DETAILED DESCRIPTION

[0021] The present invention provides a method for processing a 2-series aluminum alloy plate, comprising the following steps:

[0022] 1) subjecting the 2 series aluminum alloy sheet to solution treatment and quenching treatment in sequence to obtain a quenched sheet;

[0023] 2) subjecting the quenched plate to a deep cryogenic treatment and then to a first rolling to obtain a first rolled plate;

[0024] 3) After the first rolled plate is subjected to heat preservation treatment, a second rolling is performed, and after the second rolling is completed, an aging treatment is performed to obtain a treated 2 series aluminum alloy plate.

[0025] In the present invention, the temperature of the solution treatment in step 1) is 480-550°C, preferably 490-530°C, and more preferably 510-520°C; the time of the solution treatment is 0.5-6h, preferably 0.8-5.5h, further preferably 1.0-4.0h, and more preferably 2.0-3.0h; the quenching treatment is water quenching, preferably room temperature water quenching.

[0026] In the present invention, the temperature of the cryogenic treatment in step 2) is -100 to -196°C, preferably -120 to -190°C; the time of the cryogenic treatment is 0.2 to 3h, preferably 0.5 to 2.5h, further preferably 0.8 to 2.0h, and more preferably 1.0 to 1.5h.

[0027] In the present invention, in step 2), liquid nitrogen is used to cool the quenched plate during the first rolling process; the reduction amount of the first rolling is 2-15%, preferably 3-12%, more preferably 5-10%, and more preferably 7-9%.

[0028] In the present invention, the first rolling in step 2) is deep cold rolling, and the deep cold rolling is preferably performed by deep cold treatment of the quenched plate, and then taking out the plate and rolling it immediately; liquid nitrogen cooling is preferably used during the rolling process.

[0029] In the present invention, the temperature of the insulation treatment in step 3) is 20-300°C, preferably 50-260°C, and more preferably 70-120°C; the time of the insulation treatment is 0.2-4h, preferably 0.5-3.5h, further preferably 1.0-3.0h, and more preferably 1.5-2.0h.

[0030] In the present invention, the reduction amount of the second rolling in step 3) is 2 to 15%, preferably 3 to 12%, more preferably 5 to 10%, and even more preferably 7 to 9%.

[0031] In the present invention, the second rolling in step 3) is preferably performed by heat-insulating the once rolled plate, taking out the plate and rolling it immediately; the second rolling is conventional rolling.

[0032] In the present invention, the temperature of the aging treatment in step 3) is 130-200°C, preferably 140-180°C, more preferably 145-175°C, and more preferably 150-170°C; the time of the aging treatment is 6-48h, preferably 12-36h.

[0033] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0034] Example 1

[0035] 1) The 2519 aluminum alloy plate was solution treated at 530°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0036] 2) subjecting the quenched plate to a liquid nitrogen cryogenic treatment, wherein the cryogenic treatment temperature is -196°C for 1 hour, and then immediately subjecting the plate to cryogenic rolling, during which the plate is continuously cooled by liquid nitrogen spraying, and the rolling reduction is 3% of the thickness of the quenched plate, to obtain a first rolled plate;

[0037] 3) After the first rolled plate is subjected to a heat preservation treatment at a temperature of 165°C for 0.5h, the second rolling is immediately carried out. The second rolling is conventional rolling, and the rolling reduction is 4% of the thickness of the quenched plate. Finally, a peak aging treatment is carried out at a temperature of 165°C for 8h to obtain a treated 2519 aluminum alloy plate 1 (denoted as 3% (DCT) -4% (165°C)).

[0038] Example 2

[0039] 1) The 2519 aluminum alloy plate was solution treated at 530°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0040] 2) subjecting the quenched plate to a liquid nitrogen cryogenic treatment, wherein the cryogenic treatment temperature is -196°C for 1 hour, and then immediately subjecting the plate to cryogenic rolling, during which the plate is continuously cooled by liquid nitrogen spraying, and the rolling reduction is 3% of the thickness of the quenched plate, to obtain a first rolled plate;

[0041] 3) After the first rolled plate is placed at room temperature (25°C) for 2 hours, it is rolled for the second time at room temperature. The second rolling is conventional rolling, and the rolling reduction is 4% of the thickness of the quenched plate. Finally, it is subjected to peak aging treatment at a temperature of 165°C for 10 hours to obtain the treated 2519 aluminum alloy plate 2 (denoted as 3% (DCT) -4% (RT)).

[0042] Comparative Example 1

[0043] T87 treatment of 2519 aluminum alloy:

[0044] 1) The 2519 aluminum alloy plate was solution treated at 530°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0045] 2) The quenched plate was rolled at room temperature (25°C) with a rolling reduction of 7% of the thickness of the quenched plate, and finally subjected to peak aging treatment at 165°C for 12h to obtain a treated 2519 aluminum alloy plate 3 (denoted as T87).

[0046] Comparative Example 2

[0047] 1) The 2519 aluminum alloy plate was solution treated at 530°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0048] 2) The quenched plate was subjected to liquid nitrogen cryogenic treatment, wherein the cryogenic treatment temperature was -196°C for 1 hour, and then cryogenic rolling was immediately performed, during which liquid nitrogen was continuously sprayed to cool the plate, and the rolling reduction was 7% of the thickness of the quenched plate. Finally, a peak aging treatment was performed at a temperature of 165°C for 10 hours to obtain a treated 2519 aluminum alloy plate 4 (denoted as 7% (DCT)).

[0049] Example 3

[0050] 1) The 2195 aluminum alloy plate was solution treated at 510°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0051] 2) subjecting the quenched plate to a liquid nitrogen cryogenic treatment, wherein the cryogenic treatment temperature is -196°C for 1 hour, and then immediately subjecting the plate to cryogenic rolling, during which the plate is continuously cooled by liquid nitrogen spraying, and the rolling reduction is 3% of the thickness of the quenched plate, to obtain a first rolled plate;

[0052] 3) After the first rolled plate is subjected to a heat preservation treatment at a temperature of 50°C for 0.5h, a second rolling is immediately performed. The second rolling is conventional rolling, and the rolling reduction is 4% of the thickness of the quenched plate. Finally, a peak aging treatment is performed at a temperature of 155°C for 28h to obtain the treated 2195 aluminum alloy plate 5.

[0053] Comparative Example 3

[0054] T87 treatment of 2195 aluminum alloy:

[0055] 1) The 2195 aluminum alloy plate was solution treated at 510°C for 2 hours and then water quenched at room temperature to obtain a quenched plate;

[0056] 2) The quenched plate was rolled at room temperature (25°C) with a rolling reduction of 7% of the thickness of the quenched plate, and finally subjected to peak aging treatment at 155°C for 28h to obtain the treated 2195 aluminum alloy plate 6.

[0057] The mechanical properties of the 2519 aluminum alloy plates 1, 2, 3, and 4 treated in Examples 1 to 2 and Comparative Examples 1 to 2 were tested using a universal mechanical stretching machine. The mechanical properties test results of the 2519 aluminum alloy plates 1, 2, 3, and 4 are as follows: Figure 1 As shown, from Figure 1 It can be seen that the strength and elongation of the plates 1 and 2 processed by the method of the present invention are higher than those of the plates 3 processed by the traditional T87 process and the plates 4 processed by the deep cold rolling process, and the yield strength and tensile strength of the plate 1 processed by the method of the present invention are increased by 10.1% and 14.0% respectively compared with the plate 3 processed by the T87 process.

[0058] The mechanical properties of the 2195 aluminum alloy plates 5 and 6 after treatment in Example 3 and Comparative Example 3 were tested by a universal mechanical stretching machine. It was found that the yield strength and elongation of the plate 6 treated by the T87 process were 575 MPa and 13.1%, respectively, while the yield strength and elongation of the plate 5 treated by the method of the present invention were 616 MPa and 15.2%, respectively. It can be seen that compared with the plate 6 treated by the conventional T87 process in Comparative Example 3, the yield strength and elongation of the plate 5 treated by the method of the present invention are improved.

[0059] The microstructure morphology of the 2519 aluminum alloy plate 1 treated in Example 1 and the 2519 aluminum alloy plate 3 treated in Comparative Example 1 were characterized. Figures 2-3 The microstructure of the 2519 aluminum alloy plate 1 after treatment in Example 1 is shown in FIG. Figure 2 As shown; the microstructure diagram of 2519 aluminum alloy plate 3 after ordinary T87 process treatment is as follows Figure 3 As shown. Figure 2 and Figure 3 It can be seen that the strengthening phase of the 2519 aluminum alloy plate 1 treated by the method of the present invention is finer and more dispersed. This is mainly due to the formation of many pinning dislocations after deep cold pretreatment. At the same time, due to the activation of different slip systems under deep cold deformation and secondary deformation conditions, the dislocation distribution in the 2 series aluminum alloy is more uniform, thereby making the precipitated phase finer and more uniform.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for processing a 2-series aluminum alloy sheet, characterized in that: The steps include: 1) subjecting the 2 series aluminum alloy sheet to solution treatment and quenching treatment in sequence to obtain a quenched sheet; 2) subjecting the quenched plate to a deep cryogenic treatment and then to a first rolling to obtain a first rolled plate; 3) After the first rolled plate is subjected to heat preservation treatment, a second rolling is performed, and after the second rolling is completed, an aging treatment is performed to obtain a treated 2 series aluminum alloy plate.

2. A method for processing a 2-series aluminum alloy sheet according to claim 1, characterized in that: The temperature of the solution treatment in step 1) is 480-550°C and the time is 0.5-6h; The quenching treatment is water quenching.

3. A method for processing a 2-series aluminum alloy sheet according to claim 2, characterized in that: The temperature of the deep cryogenic treatment in step 2) is -100 to -196°C, and the time is 0.2 to 3 hours.

4. A method for processing a 2-series aluminum alloy sheet according to any one of claims 1 to 3, characterized in that: In step 2), liquid nitrogen is used to cool the quenched plate during the first rolling process; the reduction amount of the first rolling is 2-15%.

5. A method for processing a 2-series aluminum alloy sheet according to claim 4, characterized in that: The temperature of the heat preservation treatment in step 3) is 20-300°C and the time is 0.2-4h; The reduction amount of the second rolling is 2 to 15%.

6. A method for processing a 2-series aluminum alloy sheet according to claim 5, characterized in that: The aging treatment in step 3) is carried out at a temperature of 130 to 200° C. and for a time of 6 to 48 hours.

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