CN108642331A - A kind of 6181 aluminium alloys and preparation method thereof for Automobile Plate - Google Patents
A kind of 6181 aluminium alloys and preparation method thereof for Automobile Plate Download PDFInfo
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- CN108642331A CN108642331A CN201810537865.XA CN201810537865A CN108642331A CN 108642331 A CN108642331 A CN 108642331A CN 201810537865 A CN201810537865 A CN 201810537865A CN 108642331 A CN108642331 A CN 108642331A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
- C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
Abstract
The present invention provides a kind of preparation method of 6181 aluminium alloys for Automobile Plate, raw material includes following component by weight percentage：Si：0.7%~1%、Fe：≤0.01%、Cu：≤0.1%、Mn：0.1%~0.18%、Mg：0.7%~0.9%、Sr：0.02% ~ 0.04%, the single content of other impurity is not more than 0.02%, and total amount is not more than 0.1%, Al surpluses.Component raw material is obtained into 6181 aluminium alloys for being used for Automobile Plate after blank, Homogenization Treatments, once cold rolling to intermediate anneal gauge, intermediate annealing, secondary cold-rolling, ageing treatment is made in melting, continuous casting and rolling.The composition proportion and process of the present invention is by microalloying adjusting component, and by solid solution, the optimization of the techniques such as artificial aging, compound pretreatment substantially increases the mechanical property and forming property of alloy, fully meets the requirement of Automobile Plate.
Description
Technical field
The invention belongs to Automobile Plate aluminium alloy and its preparing technical fields, and Automobile Plate is used for more particularly, to one kind
6181 aluminium alloys and preparation method thereof.
Background technology
Currently, body of a motor car includes mainly 2000 systems with Aluminum sheets（Al-Cu-Mg systems）, 5000 systems（Al-Mg systems）And
6000 systems（Al-Mg-Si systems）Deng three big series alloys.
2000 systems（Al-Cu systems）Aluminium alloy category is a kind of heat-treatable strengthened type aluminium alloy, has good welding performance,
Higher strong hardness.In ag(e)ing process, CuMgAl can be precipitated2And CuAl2Equal hardening constituents, to improve the intensity of alloy.But
It is that, since this is that Cu constituent contents are higher in alloy, corrosion resisting property is poor compared to the vehicle body plate aluminum alloy of other alloy series, easily
Phenomena such as spot corrosion, Peeling Corrosion, corrosion cracking occurs, and, these factors weaker in the age hardening capability of baking vanish hardening process
All limit 2000 line aluminium alloy auto body sheets commercial Application.Such as the main hardening constituent of AA2008 is CuMgAl2,
The Age-prrcipitation Phase forming core of the alloy is more difficult, and age hardening capability is relatively low, is mainly used in inner panel.
5000 systems (Al-Mg systems) aluminium alloy is mainly common by Mg atoms solution strengthening and refined crystalline strengthening in aluminum substrate
It acts on to improve alloy strength, belonging to heat treatment can not enhanced type aluminium alloy.5000 line aluminium alloys are in forming property, corrosion resistance
Can and welding performance performance it is very superior, but 5000 line aluminium alloys under annealed condition, during machining deformation there may be
Luders band and delayed yield, plate surface are easy corrugation, influence the surface quality of plank, or even still cannot be complete after baking vanish
It eliminates, it is impossible to meet the surface quality requirements of vehicle-body outer panel.And its intensity is low than 2000 systems and 6000, in baking vanish process
In it is also possible that ruckbildung, it is less strict to be mainly used for Surface Quality requirement, complex-shaped body of a motor car inner panel.Mesh
Before, the HVNV5182-O materials of HANV metal companies exploitation, X5082-O the and 5182-O materials of ALCOA companies of U.S. exploitation are
For body of a motor car inner panel.
6000 systems（Al-Mg-Si systems）Aluminium alloy is that a kind of heat treatment can enhanced type aluminium alloy.This is alloy with higher
Intensity, plasticity and corrosion resistance and good, easy coloring, just with recycling etc. excellent specific properties.Its main alloy element is Mg, Si element,
The precipitation hardenings phase such as formation during baking vanish.The significant intensity for improving material.Relative to 2000 systems and 5000 systems
Aluminium alloy, the biggest advantage is to the line aluminium alloys to have relatively good plasticity and stamping for 6000 line aluminium alloy Automobile Plates
Performance.Product obtains higher intensity during last paint baking by ageing strengthening, to meet vehicle body plate
Dent resistance can require.Therefore, 6000 line aluminium alloys are widely used in laminate inside and outside body of a motor car.Presently, there are the problem of be
Itself T4 and T4P state is substantially at theory state, and under natrual ageing state, and the strength enhancing after product baking vanish is significantly
It reduces.The series alloy simultaneously, whole grain structure is bigger than normal to cause comprehensive performance to be deteriorated.
6181 aluminum alloy plate materials can be used as vehicle-body outer panel, the preferred material as automotive light weight technology.However, traditional mode of production side
Formula mainly produces blank by the way of semi-continuous casting-hot rolling, and overall flow is very long, needs by casting, cooling, milling
The series of processes such as face, soaking, rolling, crop end lead to that cost is very high, energy consumption is non-due to the presence of above all multi-process
Chang great.Due to being the production of noncontinuity block-by-block, causing to need excision during subsequent production end to end, whole lumber recovery is relatively low,
There was only 70% lumber recovery under normal condition.
Continuous casting rolling technology is as a kind of technology of consecutive production blank, on 3 systems (Al-Mn) aluminium alloy at present
Through obtaining ripe application, it is widely used in the production of curtain wall panel, air conditioner aluminium foil, fin aluminium foil.But since its solidification zone is short, in life
Produce high Mg, during the alloy materials such as high Si, casting difficulty greatly increases, and is easy to cause that riser difficulty is big, haftplatte, edge are opened
Split, surface imperfection decorative pattern the defects of, which has limited use of the continuous casting rolling technology on high-leveled and difficult alloy.
The major reason that application of the continuous casting rolling technology on 6181 alloys is difficult to carry out is its distinctive segregation phenomena：
Each component phenomenon unevenly distributed in crystallization is known as being segregated in alloy.It is broadly divided into microsegregation and gross segregation two
Kind, microsegregation is called dendrite segregation.It is characterized in that in a grain colony, transgranular and grain boundaries chemical compositions are not
Unanimously, the high constituent element of fusing point is often distributed in transgranular more, and low-melting constituent element is then often distributed in crystal boundary more.Gross segregation master
Refer to that ingredient between crystal grain has differences.This phenomenon is the inherent shortcoming of casting process, but since continuous casting and rolling is casting
Roll with roll forming one, cooling velocity is very fast, causes degree of supercooling big, therefore degree of segregation is especially big.Segregation can cause to roll
It is easy cracking and end properties non-uniform phenomenon during system, is a more serious defective workmanship, this is also that influence should
The one of the major reasons that technology is widely popularized in terms of high-quality aluminum strip purposes.
Invention content
6181 aluminium alloys and preparation method thereof that the purpose of the present invention is to provide a kind of for Automobile Plate.
For Automobile Plate purposes, chooses continuous casting and rolling technique and compensate for existing alloy material by adjusting casting-rolling technology
Deficiency in terms of continuous casting and rolling, while strip casting process substantially reduces segregation phenomena, and 6181 by the way of electromagnetism intervention
By microalloying adjusting component on the basis of alloy, by solid solution, the optimization of the techniques such as artificial aging, pretreatment compensates for
The deficiency of existing alloy material has designed and developed out the aluminium alloy of this patent jurisdictions mandate（The aluminum alloy plate materials of the 6181A trades mark）,
The technical vulnerability of existing alloy is made up, patent application is carried out.It has yield strength more higher than 6016 aluminum alloy plate materials, simultaneously
Possess preferable forming property.It is a excellent automobile exterior panel material, and since its ingredient and outer plate element are roughly the same,
Thus, it is possible to effectively improve the recuperability energy of alloy, it is substituted for 5182 and 5754 and is used as body inner panel.
The above-mentioned technical purpose of the present invention is achieved through the following technical solutions：
A kind of preparation method of 6181 aluminium alloys for Automobile Plate, raw material include following component by weight percentage：
Si：0.7%~1%、 Fe：≤0.01%、 Cu：≤0.1%、 Mn：0.1%~0.18%、Mg：0.7%~0.9%、Sr：0.02%~
0.04%, the total amount of other impurity is not more than 0.1%, Al surpluses；
Specific prepare includes the following steps：
S1. blank is made by melting, continuous casting and rolling in component raw material, the speed of casting is 0.70 ~ 0.80m/min, casting temperature
Degree is 685 ~ 695 DEG C, and when casting is intervened using electromagnetic field；Pulse current frequency is 18 ~ 20%, and duty ratio is 20 ~ 23%, magnetostatic field
Magnetic induction intensity is 21 ~ 24mT；
S2. Homogenization Treatments, using twin-stage uniform heating process, processing is as follows（440~480）℃×（3~10）h→ （520~550）℃
×（14~20）H → air-cooled；
S3. it is cold-rolled to intermediate anneal gauge；
S4. intermediate annealing：The control of metal heat preservation temperature is at 310 ~ 360 DEG C, metal heat preservation 2 ~ 4 hours；
S5. finished product is rolled, is dissolved at 540 ~ 560 DEG C × 35 ~ 45 min after rolling, then carries out water quenching, water temperature
It is 20 ~ 25 DEG C；
S6. Pre-aging treatment：The pre-stretching processing for carrying out 1.5 ~ 2.5%, when 120 ~ 160 DEG C of * 5 ~ 15min of progress are pre- immediately after
Effect processing；
S7. ageing treatment：It is preserved 14 days under the conditions of 25 DEG C.
Preferably, the thickness of blank is 6.0 ~ 8.0mm in step S1.
Preferably, 1.0 ~ 1.2mm thickness, thickness deviation control≤± 1% are rolling in step S5.
Preferably, the control of single pass working modulus is 35 ~ 45% in step S3, finished product thickness tolerance+1%.
Preferably, in step S3, it is 1.4 ~ 1.7mm to be cold-rolled to thickness.
Preferably, the single content of other impurities is not more than 0.02% in raw material.
One of technical solution of the invention is to pass through microalloy（Add appropriate Mn, Sr elements）Change optimized alloy mechanics
Performance and punch forming performance optimize solid solution craft, by developing the compound pre- of pre-stretching and artificial aging by improvement
Treatment process reduces alloy T4P state yield intensity, promotes the intensity after baking, meets Automobile Plate to develop and is closed with aluminium
Gold.
Adding appropriate Mn elements improves alloy property：After adding Mn elements, Mn element portions replace Fe elements, promote needle
Shape β-Al-Fe-Si phased solns, fracture, are transformed into the granular α-Al of small and dispersed（Mn, Fe）Phase, on the one hand can be effective
Recrystallization and grain growth process of the inhibition alloy during solution treatment, to play the role of crystal grain thinning.It is another
Aspect can also provide nucleation point for the main reinforcing precipitated phase of alloy, promote the disperse educt of main hardening constituent so that alloy
Forming property and mechanical property all obtain a degree of raising；0.10% ~ 0.18%Mn is added by studying 6181A aluminium alloys
Element, Alloy Forming performance can get a promotion.
Adding appropriate Sr elements improves alloy property：After adding Sr elements, Sr elements are used as " surface active element ", add
Enter in aluminum substrate, first, Microalloying Effect can be generated, change the thermodynamical equilibrium in alloy so that the alloys member such as Si, Mn
Element reduces the segregation in crystal boundary, finally makes crystal grain refinement.β-AlFeSi are enabled to be transformed into α-AlFeSi simultaneously, to generate
Refined crystalline strengthening, dispersion-strengtherning so that alloy deformation is more uniform.So that the intensity and plasticity of alloy are all improved.Separately
On the one hand, the Precipitation Kinetics of β " can be changed by Sr being added, and reduced Precipitation Temperature and activation energy, formed the β of small and dispersed ", carry
The age-hardening performance of high alloy.
Double roll strip casting roll process can reduce the complicated procedures of forming such as heating, milling face and repeat-rolling, greatly simplify tradition
The strip technological process of production shortens the production cycle, therefore can effectively reduce enterprise's production cost, save natural resources and reduce
Pollutant emission meets the economic trend of low-carbon environment-friendly instantly.
Continuously and stably production can make to produce up to efficient, high yield effect.Preferably avoid the cropping after hot rolling
Back-end crop makes lumber recovery have 15 ~ 20% raising.
It is ground-breaking to intervene solidification behavior using electromagnetic complex field：Steady magnetic field and the pulse current composition of varying strength
Composite Field is added into strip casting process, and Composite Field has preferable inhibition to central segregation of slab, wherein pulse current frequency
Rate is 18~20%, and duty ratio is 20~23%, and magnetostatic field magnetic induction intensity is to work well within the scope of 21~24mT.
Casting-rolling technology optimization production high alloy content 6 is casting-rolling aluminum alloy：By roll casting speed (0.7 ~ 0.8m/min), pour
The reasonable control of temperature (685 ~ 695 degrees Celsius) is cast, it is casting-rolling aluminum alloy blank that can produce satisfactory 6.
The establishment of high temperature solid solution technique：It establishes（540~560）DEG C × 35 ~ 45 min be 6181 aluminium alloy flat cold-rolled sheets
Best solid solution treatment process.Within the temperature range of 490 DEG C to 590 DEG C, in the raising alloy structure of solid solubility temperature
Solvable crystalline phase gradually decreases, and recrystallization ratio and crystallite dimension gradually increase, and the intensity and elongation percentage of alloy T6 states are in first
Downward trend after rising.When solid solubility temperature is（540~560）DEG C when, reach high value.
Artificial aging and pre-stretching composite treatment process：Composite pretreatment technique is developed, is first carried out（1.5~2.5）%'s
Pre-stretching, carries out immediately after（120~160）℃*（5~15）The Pre-aging treatment of min, can with strong inhibition natrual ageing, and
The baking and hardening performance of alloy is improved, comprehensive performance more preferably sheet alloy is obtained, at this point, the 6181A aluminium of the element containing 0.15%Mn
The yield strength of alloy T4P states is only 159 MPa, and the yield strength of T8X states reaches 323 MPa.
Compared with the existing technology, the present invention has the advantage that and effect：
The composition proportion and process of the present invention passes through solid solution, artificial aging, compound pre- place by microalloying adjusting component
The optimization of the techniques such as reason, substantially increases the mechanical property and forming property of alloy, fully meets the requirement of Automobile Plate.
Specific implementation mode
Further illustrated the present invention below in conjunction with specific embodiment, but embodiment the present invention is not done it is any type of
It limits.Unless stated otherwise, the present invention uses reagent, method and apparatus is the art conventional reagent, methods and apparatus.
Unless stated otherwise, agents useful for same and material of the present invention are purchased in market.
Embodiment 1
Raw material composition is as follows：
Preparation method is as follows：
（1）It is allocated using 99.7% aluminium ingot according to upper alloying component, ingredient insufficient section is finely adjusted using intermediate alloy,
Blank, sotck thinkness 7.5mm is made in smelting, continuous casting and rolling.690 DEG C of roll casting speed 0.79m/min, cast temperature.Roll casting zone
Intervened using electromagnetic field, design parameter is：Pulse current frequency is 19%, duty ratio 22%, and magnetostatic field magnetic induction intensity is
24mT。
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.4mm thickness, the total road sub-quantity 4 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 350 DEG C, metal heat preservation 2 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：Then 550 DEG C × 40 min carry out water quenching, 20 DEG C of water temperature.
（7）Composite pretreatment technique：The pre-stretching processing for carrying out 2%, carries out at 150 DEG C of * 10min preageings immediately after
Reason.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 1 ~ 7：
First, comparative example 1 is made by 5182 grade aluminium alloys of international standard, the process conditions beyond the present invention show it with " # ".
Routinely ingredient and technique make 6181 alloy comparative examples 2~7.
5182 aluminium alloy comparative examples 1：
The chemical composition of material（WT%）It is as follows：
（1）Dispensing is carried out by above-mentioned alloying component, using 99.7% electrolysis aluminium ingot, Mg ingots and other intermediate alloys is coordinated to carry out
Dispensing.After melting, refining, slagging-off, stirring, analysis and adjusting component enter standing furnace, standing, refining, degasification, slagging-off,
It is added in molten aluminum after Al-5Ti-1B and is cast as ingot casting into casting machine.Milling is carried out to ingot casting surface.
（2）Soaking, 560 DEG C of the holding temperature of ingot casting are carried out to ingot casting, ingot casting soaking time is 7 hours.The open rolling of hot rolling
Temperature control is at 510 DEG C, and for finishing temperature control at 270 DEG C, the thickness of hot rolling blank is 6.0mm, the total road sub-quantity of hot rolling 29.
（3）Hot rolling blank is rolled to 1.0mm thickness, the total road sub-quantity 5 of cold rolling, finished product thickness tolerance+1% by cold rolling.
（4）310 DEG C of finished products temperature, soaking time 4 hours.
（5）Stretch bending is rectified rewind during, elongation control is 0.03%, unit tension 8Mpa.
Comparative example 2:
（1）It is allocated using 99.7% aluminium ingot according to upper alloying component, ingredient insufficient section is finely adjusted using intermediate alloy,
Blank, sotck thinkness 7.5mm is made in smelting, continuous casting and rolling.690 DEG C of roll casting speed 0.79m/min, cast temperature.Roll casting zone
Without using electromagnetic field intervention (#).
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.4mm thickness, the total road sub-quantity 4 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 350 DEG C, metal heat preservation 2 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：550 ℃× 40 min.Then water quenching, 20 DEG C of water temperature are carried out.
（7）Composite pretreatment technique：The pre-stretching processing for carrying out 2%, carries out at 150 DEG C of * 10min preageings immediately after
Reason.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 3:
（1）It is allocated using 99.7% aluminium ingot according to alloying component described in patent, is not added Mn, Sr element（#）, ingredient is insufficient
Part is finely adjusted using intermediate alloy, and blank, sotck thinkness 7.5mm is made in smelting, continuous casting and rolling.Roll casting speed 0.75m/
687 DEG C of min, cast temperature.Roll casting zone is intervened using electromagnetic field, and design parameter is:Pulse current frequency is 18%, and duty ratio is
20%, magnetostatic field magnetic induction intensity is 22mT.
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.4mm thickness, the total road sub-quantity 4 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 340 DEG C, metal heat preservation 3 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solid solution treatment process：550 ℃× 40 min.Solution hardening treatment process：550 ℃× 40 min.Then
Carry out water quenching, 20 DEG C of water temperature.
（7）Composite pretreatment technique：2% pre-stretching is first carried out, immediately after at the preageing of 150 DEG C of * 6min of progress
Reason.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 4:
（1）Allocated to obtain ingredient in table using 99.7% aluminium ingot according to alloying component described in patent, ingredient insufficient section uses
Intermediate alloy is finely adjusted, and blank, sotck thinkness 7.0mm is made in smelting, continuous casting and rolling.Roll casting speed 0.76m/min, casting
687 DEG C of temperature.Roll casting zone is intervened using electromagnetic field, and design parameter is:Pulse current frequency is 19%, duty ratio 20%, magnetostatic
Field magnetic induction intensity is 23mT.
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.45mm thickness, the total road sub-quantity 4 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 330 DEG C, metal heat preservation 4 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：590℃（#）Then × 40 min carry out water quenching, 20 DEG C of water temperature.
（7）Composite pretreatment technique：2.2% pre-stretching is first carried out, immediately after at the preageing of 125 DEG C of * 6min of progress
Reason.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 5:
（1）Allocated to obtain ingredient in table using 99.7% aluminium ingot according to alloying component described in patent, ingredient insufficient section uses
Intermediate alloy is finely adjusted, and blank, sotck thinkness 6mm is made in smelting, continuous casting and rolling.Roll casting speed 0.79m/min, casting temperature
689 DEG C of degree.Roll casting zone is intervened using electromagnetic field, and design parameter is：Pulse current frequency is 19%, duty ratio 22%, magnetostatic field
Magnetic induction intensity is 23mT.
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.6mm thickness, the total road sub-quantity 3 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 350 DEG C, metal heat preservation 2 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：550 ℃× 40 min.Then water quenching, 20 DEG C of water temperature are carried out.
（7）Composite pretreatment technique：Without pre-stretching and preageing technique（#）.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 6:
（1）Allocated to obtain ingredient in table using 99.7% aluminium ingot according to alloying component described in patent, ingredient insufficient section uses
Intermediate alloy is finely adjusted, and blank, sotck thinkness 6mm is made in smelting, continuous casting and rolling.Roll casting speed 0.76m/min, casting temperature
688 DEG C of degree.Roll casting zone is intervened using electromagnetic field, and design parameter is：Pulse current frequency is 19%, duty ratio 23%, magnetostatic field
Magnetic induction intensity is 24mT.
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.6mm thickness, the total road sub-quantity 3 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 350 DEG C, metal heat preservation 2 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：550 ℃× 40 min.Then water quenching, 20 DEG C of water temperature are carried out.
（7）Composite pretreatment technique：Without pre-stretching, the Pre-aging treatment of 150 DEG C of * 6min is only carried out（#）.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Comparative example 7:
（1）Allocated to obtain ingredient in table using 99.7% aluminium ingot according to alloying component described in patent, ingredient insufficient section uses
Intermediate alloy is finely adjusted, and blank, sotck thinkness 6mm is made in smelting, continuous casting and rolling.Roll casting speed 0.77m/min, casting temperature
690 DEG C of degree.Roll casting zone is intervened using electromagnetic field, and design parameter is：Pulse current frequency is 20%, duty ratio 21%, magnetostatic field
Magnetic induction intensity is 23mT.
（2）During soaking, blank use twin-stage uniform heating process, 460 DEG C × 4h → 535 DEG C × 16h specific as follows →
It is air-cooled.
（3）Cold rolling is rolled to 1.6mm thickness, the total road sub-quantity 3 of cold rolling, finished product thickness tolerance+1%.
（4）Intermediate annealing：The control of metal heat preservation temperature is at 350 DEG C, metal heat preservation 2 hours.
（5）Finished product is rolling to 1.0 thickness, thickness deviation control≤± 1%.
（6）Solution hardening treatment process：550 ℃× 40 min.Then water quenching, 20 DEG C of water temperature are carried out.
（7）Composite pretreatment technique：Without Pre-aging treatment, 2% pre-stretching processing is only carried out（#）.
（8）Natrual ageing technique：It is preserved 14 days under the conditions of 25 DEG C of room temperature.
Above-mentioned comparative example see the table below with embodiment waste material use ratio and product parameters comparison：
Claims (8)
1. a kind of preparation method of 6181 aluminium alloys for Automobile Plate, which is characterized in that raw material includes following percentage by weight
Than the component of meter：
Si：0.7%~1%、 Fe：≤0.01%、 Cu：≤0.1%、 Mn：0.1%~0.18%、Mg：0.7%~0.9%、Sr：0.02%~
0.04%, the total amount of other impurity is not more than 0.1%, Al surpluses；
Specific prepare includes the following steps：
S1. blank is made by melting, continuous casting and rolling in component raw material, the speed of casting is 0.70 ~ 0.80m/min, casting temperature
Degree is 685 ~ 695 DEG C, and when casting is intervened using electromagnetic field；Pulse current frequency is 18 ~ 20%, and duty ratio is 20 ~ 23%, magnetostatic field
Magnetic induction intensity is 21 ~ 24mT；
S2. Homogenization Treatments, using twin-stage uniform heating process, processing is as follows（440~480）℃×（3~10）h→ （520~550）℃
×（14~20）H → air-cooled；
S3. it is cold-rolled to intermediate anneal gauge；
S4. intermediate annealing：The control of metal heat preservation temperature is at 310 ~ 360 DEG C, metal heat preservation 2 ~ 4 hours；
S5. finished product is rolled, is dissolved at 540 ~ 560 DEG C × 35 ~ 45 min after rolling, then carries out water quenching, water temperature
It is 20 ~ 25 DEG C；
S6. Pre-aging treatment：The pre-stretching processing for carrying out 1.5 ~ 2.5%, when 120 ~ 160 DEG C of * 5 ~ 15min of progress are pre- immediately after
Effect processing；
S7. ageing treatment：It is preserved 14 days under the conditions of 25 DEG C.
2. preparation method according to claim 1, which is characterized in that the thickness of blank is 6.0 ~ 8.0mm in step S1.
3. preparation method according to claim 1, which is characterized in that be rolling to 1.0 ~ 1.2mm thickness, thickness in step S5
Allowance control≤± 1%.
4. preparation method according to claim 1, which is characterized in that in step S3 the control of single pass working modulus 35 ~
45%, the total road sub-quantity 4 of cold rolling, finished product thickness tolerance+1%.
5. preparation method according to claim 1, which is characterized in that in step S3, it is 1.4 ~ 1.7mm to be cold-rolled to thickness.
6. preparation method according to claim 1, which is characterized in that the single content of other impurities is not more than in raw material
0.02%。
7. 6181 aluminium alloys that the preparation method described in claim 1 to 6 is prepared.
8. 6181 aluminium alloy according to any one of claims 8, which is characterized in that 6181 aluminium alloy is used as body inner panel or outside plate.
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| CN110714176A (en) * | 2019-11-06 | 2020-01-21 | 天津大学 | Heat treatment method capable of realizing rapid aging of aluminum alloy |
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| CN111560534A (en) * | 2020-05-20 | 2020-08-21 | 汪晓难 | Electromagnetic treatment process for high-performance cast aluminum alloy intermediate melt |
| CN113046660A (en) * | 2021-02-23 | 2021-06-29 | 乳源东阳光优艾希杰精箔有限公司 | Aluminum alloy foil with excellent punch forming performance and manufacturing method and application thereof |
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| CN113265568A (en) * | 2021-05-19 | 2021-08-17 | 江苏国鑫铝业有限公司 | Sr-alloyed 1070 type aluminum alloy with high strength and high stamping performance and preparation method thereof |
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