CN117230392B - Compatible heat treatment strengthening method for Al-Mg-Si aluminum alloy and Al-Zn-Mg aluminum alloy - Google Patents
Compatible heat treatment strengthening method for Al-Mg-Si aluminum alloy and Al-Zn-Mg aluminum alloy Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 130
- 238000010438 heat treatment Methods 0.000 title claims abstract description 89
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 title claims abstract description 63
- 229910018464 Al—Mg—Si Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000005728 strengthening Methods 0.000 title claims abstract description 50
- 238000005219 brazing Methods 0.000 claims abstract description 52
- 230000032683 aging Effects 0.000 claims abstract description 49
- 239000000956 alloy Substances 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 37
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 12
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- 239000002609 medium Substances 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
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- 150000003839 salts Chemical class 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910019064 Mg-Si Inorganic materials 0.000 description 1
- 229910019406 Mg—Si Inorganic materials 0.000 description 1
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Abstract
The application relates to the technical field of aluminum alloy heat treatment, in particular to a compatible heat treatment strengthening method for an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy, which comprises the following steps: s1, performing preliminary heat treatment; s2, carrying out regression treatment on the Al-Zn-Mg series alloy by utilizing a short-time high-temperature process of integral brazing, so that the temperature interval is overlapped when the Al-Mg-Si series aluminum alloy and the Al-Zn-Mg series aluminum alloy subjected to integral brazing are subjected to aging treatment; and S3, carrying out compatible aging strengthening on the integrally brazed product. The method aims at the aluminum alloy products formed by two aluminum alloy materials of an Al-Mg-Si system and an Al-Zn-Mg system through an integral brazing process, utilizes a short-time high-temperature process of integral brazing to carry out regression treatment on the Al-Zn-Mg system aluminum alloy, improves the temperature interval of're-aging', realizes the coincidence of the aging treatment temperature intervals of the two aluminum alloy materials after brazing, solves the compatibility problem of the heat treatment strengthening system of the two aluminum alloy materials with different components, and ensures that the two aluminum alloy materials in the double alloy products can respectively meet the performance requirements of the products.
Description
Technical Field
The application relates to the technical field of aluminum alloy brazing processes, in particular to a compatible heat treatment strengthening method for an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy.
Background
One of the processing methods of aluminum alloy products such as closed impellers is to combine a housing member made of deformed aluminum alloy and a cast member of complex structure cast of aluminum alloy in a high temperature field by a monolithic brazing process. Wherein the shell part material is Al-Mg-Si aluminum alloy, and the complex structure casting part material is Al-Zn-Mg aluminum alloy. The complex cavity aluminum alloy piece after integral brazing requires that the two materials can respectively reach the T6 and T5 state mechanical property levels required by the standard.
However, because the two materials of the Al-Mg-Si series aluminum alloy and the Al-Zn-Mg series aluminum alloy have a short-time high-temperature process of integral brazing in the welding process, the mechanical properties of the two materials can be obviously reduced under the heat influence of the short-time high-temperature process, and the normal T6 state performance level and the T5 state performance level of the two materials cannot be achieved respectively, and proper heat treatment process is needed to recover the mechanical properties of the two materials. In the related art, the T6 heat treatment strengthening system for Al-Mg-Si aluminum alloy is the heat treatment of "T4 state + aging", while the T5 heat treatment strengthening system for Al-Zn-Mg aluminum alloy is the heat treatment of "F state + aging". However, each alloy system of the aluminum alloy has a special alloy composition design, and has a heat treatment strengthening mechanism and a heat treatment strengthening system, and particularly, the temperature of aging heat treatment has a large difference. The optimal T6 aging temperature of the Al-Mg-Si aluminum alloy is 170-185 ℃ and the aging time is 6-12h; the optimal T5 ageing temperature of the Al-Zn-Mg aluminum alloy is 115-130 ℃ and the ageing time is 18-24h, and the optimal ageing heat treatment temperature interval and the ageing heat treatment time of the two materials have larger difference.
Therefore, after a product consisting of two materials of Al-Mg-Si series and Al-Zn-Mg series is subjected to a short-time high-temperature process, a special heat treatment strengthening system is required to be designed, and the heat treatment temperature interval and the heat treatment time of the two alloys are unified so as to ensure that the Al-Mg-Si series aluminum alloy and the Al-Zn-Mg series aluminum alloy materials in the product can be subjected to unified compatible heat treatment and maintain respective mechanical properties.
It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the application is as follows: aiming at a composite aluminum alloy product formed by two different aluminum alloy materials of an Al-Mg-Si series aluminum alloy and an Al-Zn-Mg series aluminum alloy through an integral brazing process, the mechanical properties of the materials are reduced due to the influence of a brazing short-time high-temperature process, so that the two aluminum alloy materials can not reach the standard T6 state and T5 state levels respectively; meanwhile, because the aging heat treatment strengthening temperature and aging heat treatment time of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy material are greatly different, no proper post-welding aging heat treatment strengthening system exists, and the compatibility of the aging temperature interval and the aging time of the two aluminum alloy materials can be simultaneously satisfied, so that the problem of the standard T6 state and the T5 state mechanical properties of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy is solved.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a compatible heat treatment strengthening method for an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy comprises the following steps:
s1, preheating treatment: before a short-time high-temperature process of integral brazing, respectively carrying out heat treatment on an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy to a T4 state and a T5 state;
s2 solid solution and regression treatment: carrying out regression treatment on the Al-Zn-Mg series alloy by utilizing a short-time high-temperature process of integral brazing and a quenching process after brazing, so that the temperature interval is overlapped when the integral brazing of the Al-Mg-Si series aluminum alloy and the Al-Zn-Mg series aluminum alloy are subjected to aging treatment, and meanwhile, the solution treatment of the Al-Mg-Si series aluminum alloy is maintained;
s2 compatible ageing strengthening: and carrying out compatible aging strengthening on the integrally brazed product.
Further, the specific step of S2 includes: uniformly placing the fittings of the two materials into a welding temperature field of 595-605 ℃ for heating, and preserving heat for 60-420 seconds; quenching the workpiece by using an aqueous medium or an oil medium after the workpiece is discharged, wherein the water temperature/oil temperature is 5-35 ℃, the Al-Mg-Si aluminum alloy is subjected to solution treatment, and the Al-Zn-Mg aluminum alloy is subjected to regression treatment.
Further, the specific step of S3 includes: heating the product to 158-165 ℃, preserving heat for 9-12h, discharging and air cooling to finish compatible ageing strengthening of the two aluminum alloys.
Further, the Al-Mg-Si series aluminum alloy is 6082, 6061 or 6005.
Further, the Al-Zn-Mg aluminum alloy is ZL402.
Further, the integral brazing process in S2 is dip brazing.
Further, after S3 is completed, the mechanical properties of the Al-Mg-Si series aluminum alloy reach the T6 state standard level, and the mechanical properties of the Al-Zn-Mg series aluminum alloy reach the T5 state standard level.
Further, the interval duration between S2 and S3 is less than or equal to 3h.
The beneficial effects of this application are: in the whole heat treatment system of the Al-Mg-Si system and the Al-Zn-Mg system double alloy product, the T5 state Al-Zn-Mg system aluminum alloy is subjected to regression treatment by utilizing the short-time high-temperature procedure of integral brazing, so that the temperature interval of're-aging' of the Al-Zn-Mg system alloy is improved, the T4 state of the Al-Mg-Si system alloy is kept, the coincidence of the temperature intervals when the Al-Mg-Si system aluminum alloy and the Al-Zn-Mg system aluminum alloy are subjected to aging treatment after integral welding is realized, and the compatibility problem of the heat treatment strengthening system of the Al-Mg-Si system aluminum alloy and the Al-Zn-Mg system aluminum alloy is solved. And then, carrying out compatible aging strengthening to ensure that two materials in the Al-Mg-Si system and Al-Zn-Mg system double alloy products can respectively reach the performance required by the products.
Drawings
FIG. 1 illustrates a schematic diagram of a compatible heat treatment strengthening regime for an Al-Mg-Si based aluminum alloy and an Al-Zn-Mg based aluminum alloy, according to some embodiments of the present application.
Detailed Description
The technical features and advantages of the present application are described in more detail below with reference to the accompanying drawings so that the advantages and features of the present application may be more readily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
The embodiment of the application provides a compatible heat treatment strengthening method of an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy, which utilizes a short-time high-temperature process of integral brazing to carry out regression treatment on the Al-Zn-Mg aluminum alloy during the design of a heat treatment system, and after the regression treatment, the temperature interval of the reaging treatment of the aluminum alloy is higher than the aging temperature interval of a conventional T6 heat treatment system, thereby realizing the coincidence of the aging treatment temperature interval of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy after integral brazing, solving the compatibility problem of the heat treatment strengthening system of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy, and enabling the mechanical properties of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy to reach the normal T6 state and the T5 state respectively after the composite aluminum alloy product formed by the integral brazing process is subjected to the compatible heat treatment strengthening of the Al-Mg-Si aluminum alloy material, thereby ensuring the mechanical properties of the two aluminum alloy products after the integral brazing.
The compatible strengthening heat treatment method specifically comprises the following steps:
s1, preheating treatment: before the short-time high-temperature process of integral brazing, the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy are respectively heat treated to a T4 state and a T5 state, and the subsequent solid solution and regression treatment of the Al-Mg-Si aluminum alloy and the Al-Zn-Mg aluminum alloy are used for preparing the heat treatment state of the material.
Before the regression treatment, the material is required to reach a peak aging state, so that the Al-Zn-Mg aluminum alloy is required to be subjected to heat treatment to prepare a T5 state by preliminary heat treatment before welding, and the temperature interval of the re-aging of the Al-Zn-Mg aluminum alloy is increased; meanwhile, the temperature and time parameters of the short-time high-temperature process are difficult to realize the sufficient solution treatment of the T4 state of the Al-Mg-Si aluminum alloy, so that the T4 state preliminary heat treatment of the Al-Mg-Si aluminum alloy needs to be completed before welding;
and for the T4 preliminary heat treatment of the Al-Mg-Si aluminum alloy, the shell piece after plastic processing adopts a mature solution treatment temperature and heat preservation process, and the shell piece is fully subjected to solution treatment and then is quenched by an aqueous medium or an oil medium, so that the workpiece is in a T4 heat treatment state. And for the T5 preliminary heat treatment of the Al-Zn-Mg aluminum alloy, the cast part in a cast state can be subjected to mature aging heating temperature and heat preservation time, so that the workpiece reaches the heat treatment state of T5.
S2 solid solution and regression treatment: uniformly placing the fittings of the two aluminum alloy materials into a welding temperature field of integral brazing, and realizing the combination of the two materials through a short-time high-temperature process; quenching the workpiece by using an aqueous medium or an oil medium after the workpiece is discharged, and finishing solution treatment on the Al-Mg-Si aluminum alloy and finishing regression treatment on the Al-Zn-Mg aluminum alloy in the process; after regression treatment, the aging temperature interval of the Al-Zn-Mg aluminum alloy is improved, and the aging temperature interval of the Al-Zn-Mg-Si aluminum alloy can be overlapped with the aging temperature interval of the Al-Mg-Si aluminum alloy, so that the next compatible aging strengthening treatment can be performed;
s3 compatible ageing strengthening: and carrying out unified compatible aging heat treatment strengthening on the products combined by the brazing process, so that the two aluminum alloy materials can respectively reach the performances required by the products.
Integral brazing is a metal connection process, wherein filling metal (brazing filler metal) with a melting point lower than that of the connected metal is melted through a welding temperature field, the connected base metal is not melted, and metal connection is realized by utilizing the affinity and capillary action of filling metal liquid and the base metal. The integral brazing process can be divided into: flame brazing, induction brazing, dip brazing, vacuum brazing, resistance brazing, laser brazing, etc., each of which has its applicable application and characteristics. In the compatible strengthening heat treatment method of the embodiment of the application, the whole brazing process in S2 adopts a dipping brazing process, and the dipping brazing is a process of heating a brazing flux of a brazed object and brazing filler metal together immersed in a molten state to melt the brazing filler metal, so that the method is suitable for mass production of small pieces.
In addition, since the Al-Mg-Si aluminum alloy is subjected to regression treatment and then is not subjected to ageing strengthening heat treatment in time, a parking effect is caused, namely, after the alloy is subjected to regression treatment and is parked for more than 3-4 hours, the mechanical strength of the alloy is obviously reduced and the mechanical properties of the material are unqualified. Therefore, in the embodiment of the present application, the interval duration between the solid solution and regression treatment step of S2 and the compatible aging strengthening step of S3 is preferably set to not more than 3h.
Specifically, please refer to fig. 1, which is a schematic diagram of a compatible heat treatment strengthening system of an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy in an embodiment of the present application.
The scheme of the present invention will be explained below with reference to examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified herein and are carried out according to conditions or techniques common in the art. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. In the following examples and comparative examples, the entire brazing process in the solid solution and regression treatment steps was dip brazing, and the interval time between the solid solution and regression treatment steps and the compatible aging strengthening step was set to 3 hours.
Example 1
1. And (3) performing preliminary heat treatment: the Al-Mg-Si series and Al-Zn-Mg series fittings are respectively 6082 and ZL402 aluminum alloy, and are heat treated to the conventional T4 state and T5 state, and the performances respectively reach the R required by the technical standards m ≥205MPa，R P0.2 More than or equal to 110MPa, A is more than or equal to 14%; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating the two alloy fittings in a salt bath furnace for dipping and brazing at 595 ℃, and preserving heat for 420 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6082 and regression treatment of ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece containing the two accessories to 165 ℃, and preserving heat for 9 hours to complete compatible heat treatment strengthening treatment. The mechanical property of 6082 aluminum alloy reaches the standard level of T6 state (R m ≥310MPa，R P0.2 More than or equal to 260MPa, A more than or equal to 8 percent) and the mechanical property of the ZL402 aluminum alloy reaches the T5 state standard level (R) m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 2
1. And (3) performing preliminary heat treatment: the Al-Mg-Si series and Al-Zn-Mg series fittings are respectively 6082 and ZL402 aluminum alloy, and are heat treated to the conventional T4 state and T5 state, and the performances respectively reach the R required by the technical standards m ≥205MPa，R P0.2 More than or equal to 110MPa, A is more than or equal to 14%; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating two alloy fittings in a 600 ℃ dip soldering salt bath furnace, and preserving heat for 300 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6082 and regression treatment of ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 160 ℃, and preserving heat for 11 hours to finish compatible heat treatment strengthening treatment. The mechanical property of 6082 aluminum alloy reaches the standard level of T6 state (R m ≥310MPa，R P0.2 More than or equal to 260MPa, A more than or equal to 8 percent) and the mechanical property of the ZL402 aluminum alloy reaches the T5 state standard level (R) m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 3
1. And (3) performing preliminary heat treatment: the Al-Mg-Si series and Al-Zn-Mg series fittings are respectively 6082 and ZL402 aluminum alloy, and are heat treated to the conventional T4 state and T5 state, and the performances respectively reach the R required by the technical standards m ≥205MPa，R P0.2 More than or equal to 110MPa, A is more than or equal to 14%; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating two alloy fittings in a 605 ℃ dip soldering salt bath furnace, and preserving heat for 60 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6082 and regression treatment of ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 158 ℃, and preserving heat for 12 hours to finish compatible heat treatment strengthening treatment. 6082 aluminum alloy mechanical property reaches T6 state standard level (R m ≥310MPa，R P0.2 More than or equal to 260MPa, A is more than or equal to 8 percent), and the mechanical property of the ZL402 alloy reaches the standard level (R) of T5 state m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 4
1. And (3) performing preliminary heat treatment: the Al-Mg-Si series and Al-Zn-Mg series fittings are respectively 6061 and ZL402 aluminum alloy, and are heat treated to the conventional T4 state and T5 state, and the performances respectively reach the R required by the technical standards m ≥180MPa，R P0.2 ≥110MPa，A≥15%; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating two alloy fittings in a 605 ℃ dip soldering salt bath furnace, and preserving heat for 60 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6061, and carrying out regression treatment on ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 158 ℃, and preserving heat for 12 hours to finish compatible heat treatment strengthening treatment. 6061 aluminum alloy mechanical property reaches T6 state standard level (R m ≥260MPa，R P0.2 More than or equal to 240MPa, A more than or equal to 9 percent) and the mechanical property of the ZL402 alloy reaches the standard level (R) of the T5 state m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 5
1. And (3) performing preliminary heat treatment: the Al-Mg-Si series and Al-Zn-Mg series fittings are respectively 6061 and ZL402 aluminum alloy, and are heat treated to the conventional T4 state and T5 state, and the performances respectively reach the R required by the technical standards m ≥180MPa，R P0.2 More than or equal to 110MPa, A is more than or equal to 15 percent; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating the two alloy fittings in a salt bath furnace for dipping and brazing at 595 ℃, and preserving heat for 420 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6061, and carrying out regression treatment on ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 160 ℃ at the same time, and preserving heat for 10 hours to finish compatible heat treatment strengthening treatment. 6061 aluminum alloy mechanical property reaches T6 state standard level (R m ≥260MPa，R P0.2 More than or equal to 240MPa, A more than or equal to 9 percent) and the mechanical property of the ZL402 alloy reaches the standard level (R) of the T5 state m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 6
1. And (3) performing preliminary heat treatment: the two fittings of Al-Mg-Si system and Al-Zn-Mg system are respectively 6005 and ZL402 aluminum alloy, and are heat treated to a conventional T4 state and a conventional T5 state, and the performances respectively reach R required by technical standards m ≥180MPa，R P0.2 More than or equal to 90MPa, and A is more than or equal to 15 percent; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating two alloy fittings in a 598 ℃ dip brazing salt bath furnace, and preserving heat for 360 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6005, and carrying out regression treatment on ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 158 ℃, and preserving heat for 12 hours to finish compatible heat treatment strengthening treatment. 6005 aluminum alloy mechanical properties reach T6 state standard level (R m ≥270MPa，R P0.2 More than or equal to 225MPa, A more than or equal to 8 percent) and the mechanical property of the ZL402 alloy reaches the T5 state standard level (R) m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
Example 7
1. And (3) performing preliminary heat treatment: the two fittings of Al-Mg-Si system and Al-Zn-Mg system are respectively 6005 and ZL402 aluminum alloy, and are heat treated to a conventional T4 state and a conventional T5 state, and the performances respectively reach R required by technical standards m ≥180MPa，R P0.2 More than or equal to 90MPa, and A is more than or equal to 15 percent; and R is R m ≥235MPa，R P0.2 ≥170Mpa，A≥4%；
2. Solid solution and regression treatment: heating two alloy fittings in a 600 ℃ dip soldering salt bath furnace, and preserving heat for 300 seconds; quenching the workpiece by clear water with the water temperature of 35 ℃ after discharging, cooling to the temperature of less than 40 ℃ to finish solution treatment of 6005, and carrying out regression treatment on ZL402 alloy;
3. compatible ageing strengthening: and heating the workpiece to 162 ℃, and preserving heat for 11 hours to complete compatible heat treatment strengthening treatment. 6005 aluminum alloy mechanical properties reach T6 state standard level (R m ≥270MPa，R P0.2 More than or equal to 225MPa, A more than or equal to 8 percent) and the mechanical property of the ZL402 alloy reaches the T5 state standard level (R) m ≥235MPa，R P0.2 ≥170Mpa，A≥4%）。
The Al-Mg-Si series and Al-Zn-Mg series aluminum alloys in each example were subjected to mechanical property testing using a universal material testing machine using standard tensile test specimens, and the results are shown in the following table:
table 1 mechanical properties of two aluminum alloy materials in examples 1-7
Comparative examples 1 to 7 were prepared by subjecting Al-Mg-Si series and Al-Zn-Mg series aluminum alloys to no preliminary heat treatment step, respectively to a thermoplastic working state and a casting state before being welded, and after being subjected to integral welding "short-time high-temperature process", and further to compatible aging heat treatment similar to those of examples 1 to 7, the properties of the products were as shown in the following table, and the specific integral welding "short-time high-temperature process", aging treatment and performance test method were consistent with those of the corresponding examples.
Table 2 mechanical Properties of the two aluminum alloy materials of comparative examples 1 to 7
By combining the data of the examples and the comparative examples, it can be seen that by adopting the compatible heat treatment system of the examples, after unified treatment of the Al-Mg-Si series and Al-Zn-Mg series aluminum alloy materials, the mechanical properties of T6 and T5 required by corresponding standards (EN 755-2 and ASTM B26/B26M-12) are respectively achieved, and the application requirements of products are met. And it is difficult to observe the mechanical properties of the corresponding comparative examples to meet the corresponding standard requirements. Therefore, the heat treatment system can meet the heat treatment requirement of Al-Mg-Si series and Al-Zn-Mg series aluminum alloy dual-material products, realizes the compatible heat treatment of Al-Mg-Si series and Al-Zn-Mg series aluminum alloy, and has obvious technical innovation.
In the description of the present specification, reference to the terms "some implementations," "some embodiments," "exemplary," "example," "preferred," or "further" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (3)
1. A compatible heat treatment strengthening method for an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy is characterized by comprising the following steps:
s1, preheating treatment: before a short-time high-temperature process of integral brazing, respectively carrying out heat treatment on an Al-Mg-Si aluminum alloy and an Al-Zn-Mg aluminum alloy to a T4 state and a T5 state;
s2 regression treatment: carrying out regression treatment on the Al-Zn-Mg series alloy by utilizing a short-time high-temperature process of integral brazing and a quenching process after brazing, so that the temperature interval is overlapped when the Al-Mg-Si series aluminum alloy and the Al-Zn-Mg series aluminum alloy after integral brazing realize aging treatment; the method comprises the following specific steps: uniformly placing the fittings of the two materials into a temperature field of 595-605 ℃ for heating, and preserving heat for 60-420 seconds; quenching the workpiece by using an aqueous medium or an oil medium after the workpiece is discharged, wherein the water temperature/oil temperature is 5-35 ℃, the Al-Mg-Si aluminum alloy is subjected to solution treatment, and the Al-Zn-Mg aluminum alloy is subjected to regression treatment;
s3 compatible ageing strengthening: carrying out compatible aging strengthening on the product subjected to integral brazing; the method comprises the following specific steps: heating the product to 158-165 ℃, preserving heat for 9-12h, discharging from the furnace, and air cooling to complete compatible ageing strengthening of the two alloys;
wherein the interval duration between S1 and S2 is less than or equal to 3h; the Al-Mg-Si series aluminum alloy is 6082, 6061 or 6005, and the Al-Zn-Mg series aluminum alloy is ZL402.
2. The method of claim 1, wherein the integral brazing process in S2 is dip brazing.
3. The method of claim 1, wherein after S3 is completed, the mechanical properties of the Al-Mg-Si based aluminum alloy reach a T6 state standard level and the mechanical properties of the Al-Zn-Mg based aluminum alloy reach a T5 state standard level.
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