CN111575618B - Treatment method for reducing cracking tendency of large-deformation rolling Al-Zn alloy - Google Patents
Treatment method for reducing cracking tendency of large-deformation rolling Al-Zn alloy Download PDFInfo
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- CN111575618B CN111575618B CN202010414842.7A CN202010414842A CN111575618B CN 111575618 B CN111575618 B CN 111575618B CN 202010414842 A CN202010414842 A CN 202010414842A CN 111575618 B CN111575618 B CN 111575618B
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- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
The invention relates to a processing method for reducing cracking tendency of a large-deformation rolling Al-Zn alloy, which comprises the following steps in sequence: (1) homogenizing the cast Al-Zn alloy blank which is not treated after casting and forming (2) and carrying out multi-pass rolling, wherein the reduction of each time in the rolling process is 25-30%; (3) after the rolling process is carried out for three times or four times, stress relief annealing treatment is carried out; (4) after the annealing treatment is finished, immediately carrying out a multi-pass turning rolling process, wherein the reduction amount of each time is 25-30%, and after the turning rolling process is carried out for three or four passes, rolling Al-Zn alloy with the deformation amount of more than 90% can be obtained; (5) finally, T6 heat treatment is carried out. The treatment method can obtain the large-deformation Al-Zn alloy with higher strength and toughness, and effectively reduce the cracking problem caused by the large-deformation rolling process.
Description
Technical Field
The invention relates to the technical field of alloy treatment, in particular to a treatment method for reducing cracking tendency of a large-deformation rolling Al-Zn alloy.
Background
Cast aluminum alloys can be classified into four types according to the difference of main elements: aluminum silicon alloys, aluminum copper alloys, aluminum magnesium alloys, and aluminum zinc alloys. The Al-Zn alloy has the advantages of light weight, high specific strength, corrosion resistance, easy processing and forming, is suitable for being used as a light-weight high-strength structural member, and is an alloy material widely applied to the aviation industry, particularly the aircraft manufacturing industry. The common brands are ZL401, ZL402 and the like, the price is relatively low, and the welding and casting performances are excellent. The modern transportation industry has the requirements of high strength and light weight for the transportation industry, and the strength requirement for the Al-Zn alloy is further improved.
The strength of the plate alloy can be effectively improved by rolling, the tensile strength of the Al-Zn alloy subjected to strengthening treatment can reach 700MPa, and the yield strength of the Al-Zn alloy is as high as 600 MPa. However, the high yield strength causes the Al-Zn alloy to have stronger work hardening tendency and larger local deformation tendency, and the cracking problem is easy to occur in the rolling process, especially in the rolling process with large deformation amount.
Disclosure of Invention
In order to solve the technical problem that cracking is easy to occur in the large-deformation rolling process of the Al-Zn alloy, the treatment method for reducing the cracking tendency of the large-deformation rolled Al-Zn alloy is provided. The method has the advantages of convenient operation process, high efficiency and short period, and effectively reduces the cracking tendency of the Al-Zn alloy.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a treatment method for reducing the cracking tendency of a large-deformation rolling Al-Zn alloy comprises the following sequential steps:
(1) homogenizing the cast and formed Al-Zn alloy casting blank which is not treated;
(2) immediately carrying out a multi-pass rolling process on the homogenized Al-Zn alloy, wherein the reduction of each pass of the rolling process is 25-30%;
(3) after the rolling process is carried out for three times or four times, stress relief annealing treatment is carried out;
(4) after the annealing treatment is finished, immediately carrying out a multi-pass turning rolling process, wherein the reduction amount of each time is 25-30%, and after the turning rolling process is carried out for three or four passes, rolling Al-Zn alloy with the deformation amount of more than 90% can be obtained;
(5) finally, T6 heat treatment is carried out.
Further, the thickness of the Al-Zn alloy casting blank in the step (1) is 10 mm; the content of zinc in the Al-Zn alloy casting blank is 10-30 wt%, and the balance is aluminum.
Further, the temperature of the homogenization treatment in the step (1) is 450-470 ℃, and the heat preservation time is 12-24 h.
Further, the rolling process in the step (2) adopts flat roll rolling, the diameters of the upper and lower rollers are the same during rolling, the rotating directions are opposite, and the rotating speeds are kept consistent.
Further, the temperature of the stress-relief annealing treatment in the step (3) is 425-450 ℃, and the heat preservation time is 2-4 h.
Furthermore, in the step (3), the heat treatment furnace is preheated to the set temperature of the stress relief annealing treatment before the stress relief annealing treatment is performed.
Further, the turning rolling in the step (3) is performed after the Al-Zn alloy in the rolling process in the step (2) is rotated by 90 degrees, and the diameter, the rotating direction and the rotating speed of the roller are consistent with those in the step (2).
Further, the T6 heat treatment process in the step (4) is to perform solution treatment, then water cooling to room temperature, and finally perform aging treatment.
Furthermore, the temperature of the solution treatment is 470-520 ℃, and the heat preservation time is 4 h; the temperature of the aging treatment is 120-150 ℃, and the heat preservation time is 16 h.
The beneficial technical effects are as follows:
according to the invention, the Al-Zn alloy casting blank which is not subjected to any treatment is firstly subjected to homogenization treatment, then is subjected to rolling, stress relief annealing treatment and turning rolling to obtain the large-deformation rolling Al-Zn alloy with the deformation amount of more than 90%, and the rolled large-deformation Al-Zn alloy is subjected to T6 treatment, so that the cracking problem caused in the large-deformation rolling process can be effectively reduced, and the large-deformation Al-Zn alloy with higher strength and toughness can be obtained. The Al-Zn alloy with high zinc content is easy to crack in the rolling process, and the stress caused by rolling can be effectively removed by timely annealing treatment after the rolling process, so that the cracking tendency after turning to rolling is reduced; and the turning rolling can eliminate micro-cracks caused by the previous rolling, obviously reduce the cracking tendency of the rolling with large deformation quantity, and further obtain the large rolling deformation quantity. The invention can obviously reduce the cracking tendency of the Al-Zn alloy in large deformation rolling, and the rolling process is easy to control.
Drawings
FIG. 1(a) is a physical representation of the appearance of an Al-20 wt% Zn alloy treated in comparative example 1;
FIG. 1(b) is a pictorial representation of the appearance of an Al-20 wt% Zn alloy after treatment in example 2 of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, the numerical values set forth in these examples do not limit the scope of the invention. Techniques, methods known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
Example 1
A treatment method for reducing the cracking tendency of a large-deformation rolling Al-Zn alloy comprises the following sequential steps:
(1) homogenizing the cast and formed Al-10 wt% Zn alloy blank which is not subjected to any treatment, wherein the temperature of the homogenization treatment is 450 ℃, and the heat preservation time is 24 hours;
(2) immediately carrying out a multi-pass rolling process on the homogenized Al-Zn alloy, wherein the reduction of each pass of the rolling process is 30%;
(3) after the rolling process is carried out for three times, carrying out stress relief annealing treatment, wherein the temperature of the stress relief annealing treatment is 426 ℃, and the heat preservation time is 2 hours;
(4) immediately carrying out a multi-pass turning rolling process after the annealing treatment is finished, wherein the reduction of each time is 25%, and after the turning rolling process is carried out to the fourth pass, rolling Al-10 wt% Zn alloy with the deformation of 92% can be obtained;
(5) finally, carrying out T6 heat treatment, wherein the T6 heat treatment process comprises the steps of firstly carrying out solid solution treatment, then carrying out water cooling to room temperature, and finally carrying out aging treatment, wherein the temperature of the solid solution treatment is 470 ℃, and the heat preservation time is 4 hours; the temperature of the aging treatment is 120 ℃, and the heat preservation time is 16 h.
The sample of this example did not crack and a tensile test sample of full test performance could be cut.
Example 2
A treatment method for reducing the cracking tendency of a large-deformation rolling Al-Zn alloy comprises the following sequential steps:
(1) homogenizing the cast and formed Al-20 wt% Zn alloy blank which is not subjected to any treatment, wherein the temperature of the homogenizing treatment is 460 ℃, and the heat preservation time is 18 h;
(2) immediately carrying out a multi-pass rolling process on the homogenized Al-Zn alloy, wherein the reduction of each pass of the rolling process is 30%;
(3) after the rolling process is carried out for three times, carrying out stress relief annealing treatment, wherein the temperature of the stress relief annealing treatment is 440 ℃, and the heat preservation time is 3 hours;
(4) after the annealing treatment is finished, immediately carrying out a multi-pass turning rolling process, wherein the reduction amount of each time is 30%, and after the turning rolling process is carried out for three times, rolling Al-20 wt% Zn alloy with the deformation amount of 90% can be obtained;
(5) finally, carrying out T6 heat treatment, wherein the T6 heat treatment process comprises the steps of firstly carrying out solid solution treatment, then carrying out water cooling to room temperature, and finally carrying out aging treatment, wherein the temperature of the solid solution treatment is 495 ℃, and the heat preservation time is 4 h; the temperature of the aging treatment is 135 ℃, and the heat preservation time is 16 h.
The appearance of the tensile test sample for cutting out the test performance of the sample of this example is shown in fig. 1(a), and the sample of this example is not cracked and can cut out the tensile test sample with complete test performance.
Example 3
A treatment method for reducing the cracking tendency of a large-deformation rolling Al-Zn alloy comprises the following sequential steps:
(1) homogenizing the cast and formed Al-30 wt% Zn alloy blank which is not subjected to any treatment, wherein the temperature of the homogenization treatment is 470 ℃, and the heat preservation time is 24 hours;
(2) immediately carrying out a multi-pass rolling process on the homogenized Al-Zn alloy, wherein the reduction of each pass of the rolling process is 25%;
(3) after the rolling process is carried out for four times, carrying out stress relief annealing treatment, wherein the temperature of the stress relief annealing treatment is 450 ℃, and the heat preservation time is 4 hours;
(4) immediately carrying out a multi-pass turning rolling process after the annealing treatment is finished, wherein the rolling reduction is 25% each time, and after the turning rolling process is carried out for four passes, rolling Al-30 wt% Zn alloy with the deformation of 95% can be obtained;
(5) finally, carrying out T6 heat treatment, wherein the T6 heat treatment process comprises the steps of firstly carrying out solid solution treatment, then carrying out water cooling to room temperature, and finally carrying out aging treatment, wherein the temperature of the solid solution treatment is 520 ℃, and the heat preservation time is 4 h; the temperature of the aging treatment is 150 ℃, and the heat preservation time is 16 h.
The sample of this example did not crack and a tensile test sample of full test performance could be cut.
Comparative example 1
This comparative example is the same as the treatment method of example 2 except that step (3) was not performed. The step (3) is not carried out in the treatment process, but the turning rolling is directly carried out, in the turning rolling process, the Al-20 wt% Zn alloy subjected to the three times of turning rolling is seriously cracked, the cracking is still serious after the step (5), the appearance of the sample is shown in figure 1(a), and the sample of the comparative example cannot be used for cutting a tensile test sample for testing the performance due to the serious cracking.
Comparative example 2
This comparative example is the same as the treatment method of example 2, except that the solution treatment and aging treatment of step (5) are followed by the homogenization treatment of step (1), and the resulting alloy has a certain degree of cracking phenomenon.
The Al-Zn alloys treated in the above examples and comparative examples were subjected to performance tests, the test items including yield strength, tensile strength, and elongation at break, and the data are shown in Table 1.
TABLE 1 Al-Zn alloy Properties after treatment of examples and comparative examples
As can be seen from table 1, in embodiments 1 to 3 of the present invention, a large deformation rolling Al-Zn alloy of 90% or more can be obtained by performing homogenization treatment on an Al-Zn alloy casting blank with high zinc content without any treatment, then performing rolling, stress relief annealing treatment, and turning rolling, and after performing T6 treatment on the rolled large deformation rolling Al-Zn alloy, the cracking problem caused by the large deformation rolling process can be effectively reduced, and a large deformation Al-Zn alloy with high strength and toughness can be obtained. The Al-Zn alloy with high zinc content is easy to crack in the rolling process, and the stress caused by rolling can be effectively removed by timely annealing treatment after the rolling process, so that the cracking tendency after turning to rolling is reduced; and the turning rolling can eliminate micro-cracks caused by the previous rolling, obviously reduce the cracking tendency of the rolling with large deformation quantity, and further obtain the large rolling deformation quantity.
Comparing the comparative example 2 with the example 2, the comparative example 2 adopts homogenization treatment → solution treatment and aging treatment → rolling → stress relief annealing treatment → turning rolling, and the obtained alloy has a certain cracking phenomenon, and the comprehensive mechanical property of the alloy is much worse than that of the alloy in the example 2 of the invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A treatment method for reducing the cracking tendency of a large-deformation rolling Al-Zn alloy is characterized by comprising the following sequential steps:
(1) homogenizing the cast and formed Al-Zn alloy casting blank which is not treated; the zinc content in the Al-Zn alloy casting blank is 10-30 wt%, and the balance is aluminum;
(2) immediately carrying out a multi-pass rolling process on the homogenized Al-Zn alloy, wherein the reduction of each pass of the rolling process is 25-30%;
(3) after the rolling process is carried out for three times or four times, stress relief annealing treatment is carried out;
(4) after the annealing treatment is finished, immediately carrying out a multi-pass turning rolling process, wherein the reduction amount of each time is 25-30%, and after the turning rolling process is carried out for three or four passes, rolling Al-Zn alloy with the deformation amount of more than 90% can be obtained;
(5) finally, T6 heat treatment is carried out.
2. The treatment method for reducing the cracking tendency of the large-deformation-amount rolled Al-Zn alloy according to claim 1, wherein the thickness of the Al-Zn alloy casting blank in the step (1) is 10 mm.
3. The treatment method for reducing the cracking tendency of the large-deformation rolled Al-Zn alloy according to claim 1, wherein the temperature of the homogenization treatment in the step (1) is 450-470 ℃, and the holding time is 12-24 h.
4. The treatment method for reducing the cracking tendency of the large deformation rolling Al-Zn alloy according to the claim 1, characterized in that the rolling process in the step (2) adopts flat roll rolling, the diameters of the upper and the lower rolls are the same, the rotating directions are opposite, and the rotating speed is kept consistent.
5. The treatment method for reducing the cracking tendency of the large-deformation rolled Al-Zn alloy according to claim 1, wherein the temperature of the stress-relief annealing treatment in the step (3) is 425-450 ℃, and the holding time is 2-4 h.
6. The treatment method for reducing the cracking tendency of the large-deformation-amount rolled Al-Zn alloy according to claim 1, wherein in the step (3), the heat treatment furnace is preheated to the set temperature of the stress-relief annealing treatment before the stress-relief annealing treatment is carried out.
7. The treatment method for reducing the cracking tendency of the large deformation rolling Al-Zn alloy according to the claim 1, characterized in that the turning rolling in the step (4) is performed after the Al-Zn alloy in the rolling process in the step (3) is rotated by 90 degrees, and the diameter, the rotating direction and the rotating speed of the roller are consistent with those in the step (3).
8. The treatment method for reducing the cracking tendency of the large deformation rolling Al-Zn alloy according to the claim 1, characterized in that the T6 heat treatment process in the step (5) is solution treatment, then water cooling to room temperature, and finally aging treatment.
9. The treatment method for reducing the cracking tendency of the large-deformation rolled Al-Zn alloy according to claim 8, characterized in that the temperature of the solution treatment is 470-520 ℃, and the holding time is 4 h; the temperature of the aging treatment is 120-150 ℃, and the heat preservation time is 16 h.
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