CN117802335A - Technological method for reducing yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy - Google Patents
Technological method for reducing yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy Download PDFInfo
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- CN117802335A CN117802335A CN202311869631.2A CN202311869631A CN117802335A CN 117802335 A CN117802335 A CN 117802335A CN 202311869631 A CN202311869631 A CN 202311869631A CN 117802335 A CN117802335 A CN 117802335A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910017566 Cu-Mn Inorganic materials 0.000 title claims abstract description 14
- 229910017871 Cu—Mn Inorganic materials 0.000 title claims abstract description 14
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 39
- 239000000956 alloy Substances 0.000 claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000005097 cold rolling Methods 0.000 claims abstract description 16
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 239000011777 magnesium Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000006104 solid solution Substances 0.000 claims description 3
- 229910018131 Al-Mn Inorganic materials 0.000 claims description 2
- 229910018461 Al—Mn Inorganic materials 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000001953 recrystallisation Methods 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims 1
- 229910001092 metal group alloy Inorganic materials 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
A process method for reducing the yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy belongs to the technical field of metal alloy. The invention can select proper hot rolling temperature and rolling reduction according to alloy components, the hot rolling temperature is controlled to be 450-550 ℃, the rolling reduction of each time is 1-3mm, and the total rolling reduction of the hot rolling stage is more than or equal to 50%. The rolling reduction of each time in the cold rolling stage is 1-3mm, and the total rolling reduction in the cold rolling stage is less than or equal to 50%. Annealing at 150-200 ℃ after cold rolling is finished, and finally reducing the yield ratio of the Al-Mg-Si-Cu-Mn aluminum alloy.
Description
Technical Field
The invention belongs to the technical field of metal alloys, and relates to a process method for reducing the yield ratio of an Al-Mg-Si-Cu-Mn aluminum alloy.
Technical Field
In recent years, with the continuous development of the automobile industry, especially the abnormal army protrusion of new energy automobiles, more comfortable experience is brought to the travel of people. However, the new energy automobile has the problems of insufficient mileage and the like, restricts the development of the new energy automobile, and is required to have a longer mileage and is indispensable for light weight of the automobile. The aluminum alloy has high specific strength, good formability, good corrosion resistance and recovery potential, making it an ideal candidate for replacing heavier materials in automobiles. Among them, 6000 series aluminum alloys which can be heat treated are widely used for automobile bodies due to their good formability, surface quality and bake hardenability. Al-Mg-Si-Cu-Mn alloy is often used as the first choice of 6000 series aluminum alloy for automobile bodies.
The automobile anti-collision beam is a key component of the front end structure of the automobile body, and the alloy is required to have lower yield ratio and is used for absorbing energy generated when the automobile collides. Therefore, the invention designs a method for reducing the yield ratio of the alloy based on the Al-Mg-Si-Cu-Mn alloy, which is applied to the front end structures of automobiles such as automobile anti-collision beams and the like through the combination of a hot rolling process and a cold rolling process and annealing at a proper temperature for a certain time.
Disclosure of Invention
The invention aims to provide a process method for reducing the yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy.
The mass percentage ranges of each component element of the Al-Mg-Si-Cu-Mn alloy are as follows: mg element (0.70 wt% to 1.60 wt%), si element (0.80 wt% to 1.40 wt%), cu element (0.70 wt% to 1.60 wt%), mn element (0.40 wt% to 0.60 wt%). Wherein, a small amount of Er and Zr elements are added for preventing the recrystallization grains from growing greatly, and the mass percentage ranges of the elements are as follows: er element (0.05 wt% -0.15 wt%) and Zr element (0.05 wt% -0.15 wt%).
To achieve the above object, the process steps are as follows: casting, homogenizing, hot rolling, solid solution, cold rolling and annealing.
The method specifically comprises the following steps:
(1) Casting: preparing an alloy cast ingot by adopting a graphite crucible for smelting and iron mold casting, wherein the raw materials are pure aluminum, pure magnesium and intermediate alloys of Al-Mn, al-Cu, al-Zr, al-Si and Al-Er, wherein the pure magnesium is easy to burn in the smelting process, so that 10 percent of pure magnesium is added, and 10 minutes before casting is performed; the smelting temperature is 780+/-10 ℃, the heat preservation is carried out for 2 hours after the smelting temperature is reached, and then an iron mold is used for casting, so that alloy is prepared;
(2) Homogenizing: selecting proper homogenization temperature according to the overburning temperature point of the alloy, wherein the homogenization temperature of the selected material is 530-550 ℃, the heating time is 1-5h, the temperature is kept for 8-14h after reaching the specified temperature, cooling is carried out along with a furnace, and the alloy is sawed and milled after cooling is finished, so that an alloy plate with the thickness of 15+/-5 mm is obtained;
(3) And (3) hot rolling: hot rolling at 450-550 ℃, wherein the rolling reduction of each time is 1-3mm, the total rolling reduction is more than or equal to 50% in the hot rolling stage, and the total rolling reduction is better than 70%;
(4) Solid solution: the hot rolled plate after hot rolling is kept at 530-570 ℃ for 1-5h, and water quenching is carried out;
(5) Cold rolling: immediately starting cold rolling of the sheet after water quenching, wherein the rolling reduction of each time is 1-3mm, the total rolling reduction is less than or equal to 50% in the cold rolling stage, and the total rolling reduction is better than 40%;
(6) Annealing: annealing is carried out at 150-200 ℃ after cold rolling is finished, and the annealing time is determined according to the material composition.
The invention has the advantages of simple process operation, fewer process steps, and contribution to reducing the production time, thereby reducing the production cost.
Drawings
Fig. 1#1 alloy room temperature tensile stress strain curve.
FIG. 2#2 is a plot of tensile stress strain at room temperature for the alloy.
Fig. 3#3 alloy room temperature tensile stress strain curve.
Detailed Description
The feasibility of the process is described below in connection with actual test results, but the invention is not limited to the following examples.
Example 1
1. The raw materials are pure aluminum, pure magnesium and Al-10Mn, al-50Cu, al-10Zr, al-20Si and Al-5Er intermediate alloy, and the pure magnesium is added 10min before casting. Alloy #1 was melted at 780 ℃ and then kept at the melting temperature for 2 hours, and the actual measured composition values of alloy #1 are shown in table 1.
Table 1#1 alloy measured composition values (mass fraction%)
| Mg | Si | Cu | Mn | Er | Zr | Al | |
| #1 | 0.88 | 1.12 | 1.01 | 0.48 | 0.092 | 0.10 | Bal. |
2. Homogenizing the smelted cast ingot at 540 ℃, heating the cast ingot from room temperature to 540 ℃ for 3 hours, preserving the heat for 12 hours, sawing and milling the surface to obtain the alloy plate with the thickness of 15 mm.
3. Hot-rolled at 500℃with a reduction of 1mm each time, from 15mm hot-rolled to 5mm.
4. Carrying out solution treatment, and carrying out water quenching on the hot rolled plate at 540 ℃ for 1 h.
5. Cold rolling is started after water quenching is finished, and the rolling reduction of the rolling mill is from 5mm to 3mm, and the rolling reduction of each rolling mill is 1mm.
6. The cold-rolled sheet was annealed at 175℃for 30min.
7. The specific results are shown in fig. 1 and table 2.
Table 2#1 alloy room temperature tensile test (according to GB/T228.2-2015 standard)
| Test temperature (. Degree. C.) | Tensile strength (MPa) | Yield strength (MPa) | Elongation after break (%) | |
| #1 | 22 | 432 | 117 | 13.5 |
Example 2
1. Alloy #2 was melted at 780 ℃ and then kept at the melting temperature for 2 hours, and the actual measured composition values of alloy #2 are shown in table 3.
Table 3#2 alloy measured composition values (mass fraction%)
| Mg | Si | Cu | Mn | Er | Zr | Al | |
| #2 | 1.54 | 0.95 | 0.98 | 0.50 | 0.086 | 0.11 | Bal. |
2. Homogenizing the smelted cast ingot at 540 ℃, heating the cast ingot from room temperature to 540 ℃ for 3 hours, preserving the heat for 12 hours, sawing and milling the surface to obtain the alloy plate with the thickness of 15 mm.
3. Hot-rolled at 500℃with a reduction of 1mm each time, from 15mm hot-rolled to 5mm.
4. Carrying out solution treatment, and carrying out water quenching on the hot rolled plate at 540 ℃ for 1 h.
5. Cold rolling is started after water quenching is finished, and the rolling reduction of the rolling mill is from 5mm to 3mm, and the rolling reduction of each rolling mill is 1mm.
6. The cold-rolled sheet was annealed at 175℃for 30min.
7. The specific results are shown in fig. 2 and table 4.
Table 4#2 alloy room temperature tensile Property test (according to GB/T228.2-2015 standard)
| Test temperature (. Degree. C.) | Tensile strength (MPa) | Yield strength (MPa) | Elongation after break (%) | |
| #2 | 22 | 416 | 152 | 13.5 |
Example 3
1. Alloy #3 was melted at 780 ℃ and then kept at the melting temperature for 2 hours, and the actual measured composition values of alloy #3 are shown in table 5.
Table 5#3 alloy measured composition values (mass fraction%)
| Mg | Si | Cu | Mn | Er | Zr | Al | |
| #3 | 0.91 | 1.08 | 1.46 | 0.48 | 0.082 | 0.070 | Bal. |
2. Homogenizing the smelted cast ingot at 540 ℃, heating the cast ingot from room temperature to 540 ℃ for 3 hours, preserving the heat for 12 hours, sawing and milling the surface to obtain the alloy plate with the thickness of 15 mm.
3. Hot-rolled at 500℃with a reduction of 1mm each time, from 15mm hot-rolled to 5mm.
4. Carrying out solution treatment, and carrying out water quenching on the hot rolled plate at 540 ℃ for 1 h.
5. Cold rolling is started after water quenching is finished, and the rolling reduction of the rolling mill is from 5mm to 3mm, and the rolling reduction of each rolling mill is 1mm.
6. The cold-rolled sheet was annealed at 175℃for 30min.
7. The specific results are shown in fig. 3 and table 6.
Table 6#3 alloy room temperature tensile test (according to GB/T228.2-2015 standard)
| Test temperature (. Degree. C.) | Tensile strength (MPa) | Yield strength (MPa) | Elongation after break (%) | |
| #3 | 22 | 444 | 124 | 14.5 |
From the above results, it can be seen that the Al-Mg-Si-Cu-Mn alloys with different compositions exhibit low yield ratio after being processed by the process, and all equivalent changes and modifications according to the scope of the present invention should be covered.
Claims (4)
1. A process method for reducing the yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy comprises the following specific steps:
(1) Casting: preparing an alloy cast ingot by adopting a graphite crucible for smelting and iron mold casting, wherein the raw materials are pure aluminum, pure magnesium and intermediate alloys of Al-Mn, al-Cu, al-Zr, al-Si and Al-Er, wherein the pure magnesium is easy to burn in the smelting process, so that 10 percent of pure magnesium is added, and 10 minutes before casting is performed; the smelting temperature is 780+/-10 ℃, the heat preservation is carried out for 2 hours after the smelting temperature is reached, and then an iron mold is used for casting, so that alloy is prepared;
(2) Homogenizing: selecting proper homogenization temperature according to the overburning temperature point of the alloy, wherein the homogenization temperature of the selected material is 530-550 ℃, the heating time is 1-5h, the temperature is kept for 8-14h after reaching the specified temperature, cooling is carried out along with a furnace, and the alloy is sawed and milled after cooling is finished, so that an alloy plate with the thickness of 15+/-5 mm is obtained;
(3) And (3) hot rolling: hot rolling at 450-550 ℃, wherein the rolling reduction of each time is 1-3mm, the total rolling reduction is more than or equal to 50% in the hot rolling stage, and the total rolling reduction is better than 70%;
(4) Solid solution: the hot rolled plate after hot rolling is kept at 530-570 ℃ for 1-5h, and water quenching is carried out;
(5) Cold rolling: immediately starting cold rolling of the sheet after water quenching, wherein the rolling reduction of each time is 1-3mm, the total rolling reduction is less than or equal to 50% in the cold rolling stage, and the total rolling reduction is better than 40%;
(6) Annealing: annealing is carried out at 150-200 ℃ after cold rolling is finished, and the annealing time is determined according to the material composition.
2. The process method according to claim 1, wherein the mass percentage ranges of each constituent element of the Al-Mg-Si-Cu-Mn alloy are as follows: mg element (0.70 wt% to 1.60 wt%), si element (0.80 wt% to 1.40 wt%), cu element (0.70 wt% to 1.60 wt%), mn element (0.40 wt% to 0.60 wt%). Wherein, a small amount of Er and Zr elements are added for preventing the recrystallization grains from growing greatly, and the mass percentage ranges of the elements are as follows: er element (0.05 wt% -0.15 wt%) and Zr element (0.05 wt% -0.15 wt%).
3. The Al-Mg-Si-Cu-Mn aluminum alloy prepared according to the method of claim 1 or 2.
4. The Al-Mg-Si-Cu-Mn aluminum alloy prepared by the method of claim 1 or 2 is applied to front end structures of automobiles such as automobile anti-collision beams.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311869631.2A CN117802335A (en) | 2023-12-30 | 2023-12-30 | Technological method for reducing yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311869631.2A CN117802335A (en) | 2023-12-30 | 2023-12-30 | Technological method for reducing yield ratio of Al-Mg-Si-Cu-Mn aluminum alloy |
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- 2023-12-30 CN CN202311869631.2A patent/CN117802335A/en active Pending
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