CN104451285A - Al-Mg alloy sheet for car body and manufacturing method of Al-Mg alloy sheet - Google Patents
Al-Mg alloy sheet for car body and manufacturing method of Al-Mg alloy sheet Download PDFInfo
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- CN104451285A CN104451285A CN201410708640.8A CN201410708640A CN104451285A CN 104451285 A CN104451285 A CN 104451285A CN 201410708640 A CN201410708640 A CN 201410708640A CN 104451285 A CN104451285 A CN 104451285A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- 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
- C22F1/047—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 magnesium as the next major constituent
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Abstract
The invention provides an Al-Mg alloy sheet for a car body and a manufacturing method of the Al-Mg alloy sheet. The Al-Mg alloy sheet comprises components in percentage by weight as follows: 4.2%-5.0% of Mg, smaller than or equal to 0.1% of Si, smaller than or equal to 0.2% of Fe, smaller than or equal to 0.25% of Mn, smaller than or equal to 0.4% of Cu, smaller than or equal to 0.05% of Ti, smaller than or equal to 0.004% of B and the balance of Al and inevitable impurities. The manufacturing method of the sheet comprises steps as follows: an aluminum alloy is molten and cast to an ingot at the ratio, and then the cast ingot is subjected to surface milling and homogenizing treatment; the cast ingot is subjected to hot rolling to obtain a hot rolled sheet, and the hot rolled sheet is subjected to intermediate annealing treatment at the temperature of 300-350 DEG C for at least 2 hours; the sheet is subjected to intermediate annealing and cold rolling, a finished product with required thickness is obtained, and the cold rolling rate is 30%-70%; the cold-rolled sheet is subjected to final annealing in a continuous annealing furnace finally, the treatment temperature is 450-550 DEG C, and the treatment time is 10 s-6 min. By means of the preparation process of the aluminum alloy sheet and through controlling of alloy components, the elongation percentage of the aluminum alloy sheet is increased, and Luders slips are eliminated.
Description
Technical field
The present invention relates to a kind of aluminum alloy plate materials and manufacture method thereof, particularly relate to a kind of Al-Mg sheet alloy for the manufacture of body of a motor car, and the manufacture method of this sheet material, belong to technical field of alloy material.
Background technology
In order to environment of preserving our planet, save the limited energy, motor corporation is actively carrying out the lightweight of automobile.Aluminium alloy is owing to having light weight, corrosion-resistant and good shape the good characteristics such as performance and become the ideal material of automobile lightweight.
The automobile position of aluminum alloy plate materials is used to comprise bonnet, luggage-boot lid and front and back door.Wherein car door is due to complex-shaped, requires that sheet material has good stamping formabilily.5XXX system Al-Mg sheet alloy has excellent forming property and higher intensity, can be processed into complex-shaped component, than being more suitable for inner plate of car door.
The Al-Mg alloy that prior art is produced, unit elongation is on the low side, causes car door at later stage stamping middle cracking.And usually can produce Lüders bands at product surface in deep-draw process, have a strong impact on car door surface quality, the requirement of body of a motor car to aluminum alloy plate materials can not be met.
Summary of the invention
The object of the invention is the deficiency existed for overcoming prior art, providing high, the stamping rear surface of a kind of unit elongation not produce vehicle body Al-Mg sheet alloy and the manufacture method of Lüders bands.
Object of the present invention is achieved through the following technical solutions:
A kind of vehicle body Al-Mg sheet alloy, the composition of this aluminum alloy plate materials is: Mg:4.2 ~ 5.0wt%, Si≤0.1wt%, Fe≤0.2wt%, Mn≤0.25wt%, Cu≤0.4wt%, Ti≤0.05wt%, B≤0.004wt%, and all the other are the impurity element that Al and being difficult to avoids.
The manufacture method of aforementioned vehicle body Al-Mg sheet alloy, comprises the following steps:
1. aluminium alloy is become ingot by aforementioned proportioning melting and casting, then ingot casting is carried out milling face, Homogenization Treatments;
2. ingot casting is carried out after hot rolling obtains hot-rolled sheet, carrying out process annealing process at 300 ~ 350 DEG C, time >=2h; Be cold-rolled to finished product thickness after process annealing, cold rolling rate is 30 ~ 70%;
3. the sheet material after cold rolling is carried out final annealing in continuous annealing furnace, treatment temp is 450 DEG C ~ 550 DEG C, and the treatment time is 10s ~ 6min.
Further, step 2. described in hot rolling breaking down temperature be 450 ~ 600 DEG C, finishing temperature control is at 320 ~ 350 DEG C.Described intermediate anneal temperature scope is 300 ~ 350 DEG C.
Effect of the present invention is mainly reflected in: (1) the present invention, by controlling the preparation technology of alloying constituent and aluminum alloy plate materials, improves the unit elongation of aluminum alloy plate materials, eliminates Lüders bands; (2) the Al-Mg sheet alloy yield strength prepared by the inventive method reaches 100 ~ 140MPa, and tensile strength reaches 250 ~ 300Mpa, unit elongation >=27%, r value >=0.6, and yield strain≤0.6%, board quality is significantly improved.
Embodiment
Inventor, in exploration Al-Mg sheet alloy manufacturing processed, finds that in Al-Mg sheet alloy, each component content has a certain impact to the manufacture of this sheet material and quality.Specific as follows:
Mg:Mg is the main strengthening element in Al-Mg alloy, mainly with solid solution condition and the lower β phase (Mg of fusing point
2al
3or Mg
5al
8) exist.Mg content is lower than 4.2%, and alloy strength is too low; Mg content is higher than 5.0%, and the Mg solid solution atomic group in final alloy is too many, and during distortion, solid solution atomic group and dislocation interact, and easily form Lüders bands.
Si:Si is detrimental impurity, and Si and Mg forms Mg
2si phase, because Mg content is superfluous, reduces Mg
2si phase solubleness in the base, so not only strengthening effect is little, and reduces the plasticity of alloy.
Fe:Fe and Mn and Cr forms the compound of indissoluble, thus reduces Mn and Cr effect in the alloy, when forming more hard brittle compound in ingot structure, easily produces processing crackle.Fe content more than 0.2% after, alloy unit elongation can reduce.
Mn: certain strengthening effect can be played.When Mn content is more than 0.25wt%, unit elongation can reduce.
Therefore, contriver is through research, a kind of vehicle body Al-Mg sheet alloy is proposed, the alloying constituent used is as follows: Mg:4.2 ~ 5.0wt%, Si≤0.1wt%, Fe≤0.2wt%, Mn≤0.25wt%, Cu≤0.4wt%, Ti≤0.05wt%, B≤0.004wt%, and all the other are the impurity element that Al and being difficult to avoids.
Apply the proportioning of each composition of above-mentioned aluminium alloy, the present invention manufactures vehicle body Al-Mg sheet alloy in accordance with the following methods, and the step of the method comprises:
(1) melting and casting: first by technical pure aluminium ingot 710 ~ 770 DEG C of fusings, add aluminium manganese master alloy, ferro-aluminum master alloy, aluminium silicon master alloy, pure magnesium ingot etc., cast after melting purification, degasification, add containing Ti grain-refining agent in castingprocesses in chute, control composition content, Mg:4.2 ~ 5.0wt%, Si≤0.1wt%, Fe≤0.2wt%, Mn≤0.25wt%, Cu≤0.4wt%, Ti≤0.05wt%, B≤0.004wt%.
(2) Homogenization Treatments: homogenizing is to make intermetallic compound segmentation in alloy, and makes solute element distribution even.
(3) hot rolling: during hot rolling, breaking down temperature is 450 ~ 600 DEG C, finishing temperature control, at 320 ~ 350 DEG C, finally obtains the hot-rolled sheet of perfect recrystallization.
(4) process annealing and cold rolling:
Process annealing: temperature range is 300 ~ 350 DEG C, annealing time >=2h.If annealing temperature is lower than 300 DEG C, sheet material is difficult to recrystallize occurs; If higher than 350 DEG C, can there is severe oxidation in Al-Mg sheet alloy surface.Annealing time is less than 2 hours, and material has little time perfect recrystallization occurs, and causes uneven microstructure, the plasticity of material is reduced.
Cold rolling after process annealing: ensure that cold rolling rate is between 30 ~ 70%, cold rolling rate Tai little Huo Tai metropolitan causes sheet material anisotropy too large, and sheet material forming performance is bad.
(5) final annealing: final annealing adopts continuous annealing, and continuous annealing temperature controls between 450 ~ 550 DEG C.Lower than 450 DEG C, the crystal grain of final sheet material is too little, and yield strain value is high, easily occurs Lüders bands.Higher than 550 DEG C, final sheet material crystal grain is too large, and timber intensity is too low, can not meet the requirement of auto sheet to intensity.
The aluminum alloy plate materials that aforesaid method prepares, the present invention evaluates its performance in accordance with the following methods: according to the requirement of GB/T228, sampling preparation A50 tension specimen is carried out along vertical rolling direction, evaluate sheet material tensile strength, yield strength, unit elongation and r value, and measure the region of first peak value and platform end on stress-strain(ed) curve, i.e. yield strain.
Below, contrastively examples and comparative examples of the present invention are described, technique effect of the present invention can be confirmed further according to these embodiments and comparative example.But cited embodiment is only the preferred embodiment of the present invention, the scope that should not be understood as the above-mentioned theme of the present invention is only limitted to this, allly conceives the technical scheme formed based on the technology of the present invention, all falls within protection scope of the present invention.
Embodiment 1
In table 1, embodiment 1-5 prepares aluminium alloy plate according to alloying constituent of the present invention, and its technique is: melting, casting carry out milling face and Homogenization Treatments to ingot casting; Carry out hot rolling to the ingot casting after Homogenization Treatments, hot rolling cogging temperature is 500 DEG C, and the hot-rolled sheet thickness obtained is 6mm; Hot-rolled sheet is cold rolled to 2mm, then utilizes box-type furnace to carry out process annealing, annealing temperature is 320 DEG C, and insulation 2h, has been incubated rear air cooling.In table 1, comparative example 6-9 is for using the performance of the aluminium alloy plate manufactured by the alloy outside alloying constituent of the present invention, and its preparation technology is same as the previously described embodiments.The numeric representation of underscore is had: in test-results, yield strength does not meet between 100 ~ 140MPa, unit elongation do not meet more than 27% in table 1.
In embodiment as shown in table 1, sequence number 1-5 meets scope of the present invention, and yield strength and unit elongation meet requirement of the present invention.On the other hand, in comparative example, sequence number 6 ~ 9 because not meeting composition range of the present invention, so cause following result:
Comparative example 6 because of Mg constituent content too low, cause alloy yield strength not meet scope of the present invention.
Comparative example 7, because of Si too high levels, causes alloy unit elongation too low, does not meet application claims.
Comparative example 8, because of Fe too high levels, causes alloy unit elongation too low, does not meet application claims.
Comparative example 9, because of Mn too high levels, causes alloy unit elongation too low, does not meet application claims.
Embodiment 2
The alloy that alloy in his-and-hers watches 1 is numbered B carries out the preparation of aluminum alloy plate materials by different technique, wherein hot-rolled sheet thickness is 6mm, and process annealing soaking time is 2h.Final annealing system adopts continuous annealing, and annealing time is 1min.Table 2 represents the impact of preparation technology's alloy performance, wherein there is the numeric representation of underscore: in test-results, yield strength does not meet between 100 ~ 140MPa, unit elongation does not meet more than 27%, yield strain value does not meet less than 0.6%, r value not satisfied more than 0.6.
In embodiment as shown in table 2, the preparation technology of sequence number 10-13 meets scope of the present invention, and the yield strength of gained aluminum alloy plate materials, unit elongation, yield strain value meet requirement of the present invention.On the other hand, in comparative example, sequence number 14-17 because not meeting processing range of the present invention, so cause following result:
Comparative example 14, because the final cold rolling rate of sheet material is more than 70%, causes r value lower than 0.6, does not meet requirement of the present invention.
Comparative example 15, because intermediate anneal temperature is lower than 300 DEG C, causes the unit elongation of sheet material low, does not meet application claims.
Comparative example 16, because final annealing temperature is lower than 450 DEG C, causes sheet material yield strain value not meet requirement of the present invention more than 0.6%.
Comparative example 17, because final annealing temperature is more than 550 DEG C, causes the yield strength of sheet material too low, does not meet requirement of the present invention.
In sum, the present invention is by rational technique, alloy in composition range is carried out to the preparation of aluminum alloy plate materials, high-elongation, low yield strain value (can not cause Lüders bands), intensity and the aluminum alloy plate materials of r value within auto sheet service requirements can be provided.
Table 1: the impact of composition alloy performance
Table 2: the manufacturing process of embodiment and comparative example and performance
Claims (3)
1. a vehicle body Al-Mg sheet alloy, it is characterized in that the composition of this aluminum alloy plate materials is: Mg:4.2 ~ 5.0 wt%, Si≤0.1 wt%, Fe≤0.2 wt%, Mn≤0.25 wt%, Cu≤0.4 wt%, Ti≤0.05 wt%, B≤0.004 wt%, all the other are the impurity element that Al and being difficult to avoids.
2. the manufacture method of Al-Mg sheet alloy of vehicle body described in claim 1, is characterized in that comprising the following steps:
1. aluminium alloy is become ingot by described proportioning melting and casting, then ingot casting is carried out milling face, Homogenization Treatments;
2. ingot casting is carried out after hot rolling obtains hot-rolled sheet, carrying out process annealing process at 300 ~ 350 DEG C, time >=2h; Be cold-rolled to finished product thickness after process annealing, cold rolling rate is 30 ~ 70%;
3. the sheet material after cold rolling is carried out final annealing in continuous annealing furnace, treatment temp is 450 DEG C ~ 550 DEG C, and the treatment time is 10s ~ 6min.
3. the manufacture method of vehicle body Al-Mg sheet alloy according to claim 2, is characterized in that: step 2. described in hot rolling breaking down temperature be 450 ~ 600 DEG C, finishing temperature control is at 320 ~ 350 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410708640.8A CN104451285A (en) | 2014-11-28 | 2014-11-28 | Al-Mg alloy sheet for car body and manufacturing method of Al-Mg alloy sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410708640.8A CN104451285A (en) | 2014-11-28 | 2014-11-28 | Al-Mg alloy sheet for car body and manufacturing method of Al-Mg alloy sheet |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988441A (en) * | 2015-07-28 | 2015-10-21 | 大力神铝业股份有限公司 | Manufacturing method capable of eliminating Luders slips on surface of 5754 aluminum alloy plate |
| CN105908026A (en) * | 2016-05-31 | 2016-08-31 | 苏州有色金属研究院有限公司 | 5xxx aluminum alloy board for automobile body and manufacturing method thereof |
| CN106011560A (en) * | 2016-07-13 | 2016-10-12 | 苏州中色研达金属技术有限公司 | High-performance 5xxx series aluminium alloy and processing method thereof |
| CN110643864A (en) * | 2019-08-14 | 2020-01-03 | 中铝材料应用研究院有限公司 | Alloy plate for vehicle body and preparation method thereof |
| CN111218590A (en) * | 2019-12-04 | 2020-06-02 | 中铝材料应用研究院有限公司 | High-strength high-formability aluminum-magnesium-copper alloy plate and preparation method thereof |
| CN113186413A (en) * | 2021-04-29 | 2021-07-30 | 郑州明泰实业有限公司 | Preparation method of 5083-O-state battery case side plate for new energy automobile |
| CN114602972A (en) * | 2022-03-10 | 2022-06-10 | 湖南工程学院 | High-plasticity isotropic magnesium alloy plate and preparation method thereof |
| CN115637360A (en) * | 2022-11-17 | 2023-01-24 | 中铝材料应用研究院有限公司 | 5182 alloy plate and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988441A (en) * | 2015-07-28 | 2015-10-21 | 大力神铝业股份有限公司 | Manufacturing method capable of eliminating Luders slips on surface of 5754 aluminum alloy plate |
| CN104988441B (en) * | 2015-07-28 | 2016-10-05 | 大力神铝业股份有限公司 | A kind of manufacture method eliminating 5754 aluminium alloy plate surface luders bands |
| CN105908026A (en) * | 2016-05-31 | 2016-08-31 | 苏州有色金属研究院有限公司 | 5xxx aluminum alloy board for automobile body and manufacturing method thereof |
| CN106011560A (en) * | 2016-07-13 | 2016-10-12 | 苏州中色研达金属技术有限公司 | High-performance 5xxx series aluminium alloy and processing method thereof |
| CN106011560B (en) * | 2016-07-13 | 2018-09-14 | 苏州中色研达金属技术有限公司 | A kind of high performance 5xxx line aluminium alloys and its processing method |
| CN110643864A (en) * | 2019-08-14 | 2020-01-03 | 中铝材料应用研究院有限公司 | Alloy plate for vehicle body and preparation method thereof |
| CN111218590A (en) * | 2019-12-04 | 2020-06-02 | 中铝材料应用研究院有限公司 | High-strength high-formability aluminum-magnesium-copper alloy plate and preparation method thereof |
| CN111218590B (en) * | 2019-12-04 | 2021-07-23 | 中铝材料应用研究院有限公司 | High-strength high-formability aluminum-magnesium-copper alloy plate and preparation method thereof |
| CN113186413A (en) * | 2021-04-29 | 2021-07-30 | 郑州明泰实业有限公司 | Preparation method of 5083-O-state battery case side plate for new energy automobile |
| CN114602972A (en) * | 2022-03-10 | 2022-06-10 | 湖南工程学院 | High-plasticity isotropic magnesium alloy plate and preparation method thereof |
| CN115637360A (en) * | 2022-11-17 | 2023-01-24 | 中铝材料应用研究院有限公司 | 5182 alloy plate and preparation method thereof |
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