CN101871084B - Method for manufacturing low ductility anisotropy rolling aluminum alloy sheet - Google Patents
Method for manufacturing low ductility anisotropy rolling aluminum alloy sheet Download PDFInfo
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- CN101871084B CN101871084B CN2009101353739A CN200910135373A CN101871084B CN 101871084 B CN101871084 B CN 101871084B CN 2009101353739 A CN2009101353739 A CN 2009101353739A CN 200910135373 A CN200910135373 A CN 200910135373A CN 101871084 B CN101871084 B CN 101871084B
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Abstract
The invention relates to a method for manufacturing a low ductility anisotropy rolling aluminum alloy sheet, comprising the steps of cast molding, rolling, return annealing and quenching and tempering. Rolling quenching and tempering by applying 2-10% rolling strain is carried out on an aluminum sheet semifinished product which is subjected to hot rolling, cold rolling and return annealing, and therefore, different crystalline orientations in the aluminum sheet semifinished product generate appropriate dislocation, and the strain can be uniformly distributed on different stress directions in subsequent tensile deformation process of the manufactured rolled aluminum alloy sheets, thereby avoiding the generation of higher shearing stress component at specific stress directions caused by slippage of partial grains to result in the phenomenon of ductility reduction caused by partial stress concentration, and achieving the purposes of reducing ductility anisotropy of the rolling aluminum alloy sheets produced and increasing the integral mechanical property of the rolling aluminum alloy sheets.
Description
Technical field
The present invention relates to a kind of method of manufacture of aluminum alloy sheet, particularly a kind of method of manufacture of prolonging aluminum alloy sheet of rolling.
Background technology
Duraluminum has high-performances such as light weight, good, the easy impact briquetting of anodizing color and luster and high-cooling property; Therefore be widely used on each item industry; And consider down with reducing cost saving the energy; Material sheet turns to inevitable trend, and therefore how to improve the strength of materials and possess suitable ductility (elongation) simultaneously, then be an important topic.
Consult Fig. 1, generally roll the manufacturing of prolonging aluminum alloy sheet, comprise a cast molding step 11, and roll and prolong step 12, a Full Annealing step 13 and the one cold rolling step 14 of prolonging for the second time; Just in cast molding step 11, with the aluminium alloy stock of high-temperature fusion, with semi-continuous casting method (Direct Chill Casting; General alleged DC casting) carry out cast molding, and the oxidation film layer that will in the cast molding process of cooling, produce excludes, and make an aluminium base (industry is commonly referred to as Slab); Afterwards; Roll in this and to prolong in the step 12, this aluminium base is carried out hot rolling respectively earlier prolong and the follow-up first time of cold rolling prolonging, be molded into aluminium flake work in-process (industry common name Sheet); Carry out Full Annealing step 13 afterwards again; These aluminium flake work in-process are carried out Full Annealing (full annealing), carry out the cold rolling step 14 of the prolonging second time at last, make required rolling and prolong aluminum alloy sheet.
Roll the problem of prolonging aluminum alloy sheet at present, be to strengthen and roll the intensity of prolonging aluminum alloy sheet, and roll in the process of prolonging with the high cold rolling amount of finish that prolongs; Can make the crystal grain of original axle shape such as approximate in the aluminium base prolong direction and be elongated extension along rolling; Cause on different directions, having different mechanical propertys through rolling the aluminium flake work in-process of delaying, just so-called anisotropy (Anisotropy) phenomenon, this is just expression also; Such aluminium flake work in-process are become rolls and prolongs aluminum alloy sheet and prolong direction, vertically roll and prolong direction even other directions all have different ductility parallel rolling; And the cold rolling amount of prolonging the more, and ductility anisotropy is obvious more, and aluminum alloy sheet is prolonged in rolling of producing like this; In follow-up punch process moulding process easy more because of different directions on ductile difference, cause punching press to be broken.
Consult Fig. 2; TOHKEMY P2007-254825 number " Al-Si-Mg (Al-Mg-Si) alloy " patent case discloses carries out a cast molding step 21, in regular turn and rolls and prolong step 22, a Full Annealing step 23, a cold rolling step 24 and a processing procedure of annealing steps 25 for the second time for the second time, prolongs aluminum alloy sheet in order to produce low anisotropic the rolling of ductility.
Briefly; P2007-254825 number " Al-Si-Mg (Al-Mg-Si) alloy " patent case of this TOHKEMY is the manufacturing processed of general rolling being prolonged aluminum alloy sheet; Again more carry out a time cold rolling prolong the second time cold rolling step 24 with annealing steps 25 for the second time; Tediously long whereby fabrication steps, control aluminium flake grain fineness number be less than 50 μ m, with the intensity of the set tissue (Texture) in Cube orientation; Make lug rate (earing%) between-13% to-17%, reduce the ductility anisotropy of producing of prolonging aluminum alloy sheet of rolling.
Though; TOHKEMY P2007-254825 number " Al-Si-Mg (Al-Mg-Si) alloy " patent proposition is a kind of attempts to solve the technique means of rolling the ductility anisotropy problem of prolonging aluminum alloy sheet, yet its fabrication steps is too tediously long; And do not meet actual amount and produce needs; Simultaneously, the ductility anisotropy whether tediously long like this processing procedure very can make rolling of output prolong aluminum alloy sheet effectively reduces, and is still to be verified.
Therefore how to solve the ductility anisotropy problem that rolling of production prolonged aluminum alloy sheet, be still one of direction of present industry effort.
Summary of the invention
The object of the present invention is to provide a kind of method of manufacture of low ductility anisotropy rolling aluminum alloy sheet, it can reduce and rolls the ductility anisotropy of prolonging aluminum alloy sheet, makes rolling of work hardening type prolong aluminum alloy sheet and has preferable formability.
The contriver thinks that aluminum alloy sheet is prolonged in rolling that general fashion is produced, on its material property about the anisotropic great disappearance of ductility; Be to cause by the cold rolling amount of finish that prolongs; Particularly the thickness reduction rate of cold rolling time-delay is 85% when above, though can reach the effect that improves aluminium flake work in-process intensity fast, the half-finished ductility of relative aluminium flake also can be by sacrifice significantly; Thereby produced so-called ductility anisotropy problem, cause aluminium flake in the punch process moulding process, to destroy fracture.
The main theory of the present invention can be respectively by the half-finished tissue characteristics of following aluminium flake:
1. microtexture:
The inferior crystal grain of dislocation-free (Dislocation free) (secondary grain) in the aluminium flake work in-process about original 1 to 2 μ m; If can be through bestowing an amount of microstrain amount effect; Then can in the inferior crystal grain of different crystal orientations, all produce proper dislocation, cause rolling and prolong aluminum alloy sheet in follow-up tensile deformation process, on different stress directions; Strain can uniform distribution; Avoid at specific stress direction, have higher shear stress components on the sliding system because of local grain, the phenomenon that causes strain concentrating to cause ductility to descend in this local grain.In the text, term " inferior crystal grain " means through processing or the crystal grain that is produced after handling.
2. macrostructure:
Can eliminate yield-point (Yieldpoint) phenomenon in the drawing process through the effect of microstrain amount, make to roll and prolong aluminum alloy sheet and be difficult for to produce localized necking's distortion (Necking), and then reach to promote and roll the anisotropic purpose of the ductility of prolonging aluminum alloy sheet.
The method of manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention, a cast molding step, are rolled and are prolonged step, a recovery annealing step and a modified step.
This cast molding step is molded into an aluminium base with the aluminium alloy stock of a molten with the direct chill casting method.
This rolls and prolongs the step hot rolling and prolong and carry out once cold rolling behind this aluminium base and prolong, and making this aluminium blank molding is aluminium flake work in-process.
This recovery annealing step is bestowed recovery annealing with these aluminium flake work in-process.
This modified step is prolonged dependent variable and is rolled and prolong the aluminium flake work in-process of accomplishing this recovery annealing step with 2% to 10% roll, and makes this low ductility anisotropy rolling aluminum alloy sheet.
The method of manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention in this modified step, is rolled and is prolonged the ductility anisotropy desired value R that makes aluminium flake after the aluminium flake of accomplishing this recovery annealing step
(0/45)≤40%, R
(90/45)≤25%.
The method of manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention, this rolls, and to prolong the cold rolling thickness reduction rate of prolonging that step carries out be more than 85%.
The method of manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention; The composition of this aluminium alloy stock calculates with the total weight percent of 100 weight %, includes iron, the manganese below the 0.3 weight %, the silicon below the 0.2 weight %, the impurity below the 0.1 weight % and the aluminium of surplus below the 0.3 weight % (wt%).
Beneficial effect of the present invention is: propose original creation to prolong through hot rolling, cold rolling prolonging bestow rolling of 2% to 10% microstrain amount with the aluminium flake work in-process of recovery annealing and prolong technology, effectively promote low anisotropic the rolling of ductility of output and prolong aluminum alloy sheet.
Description of drawings
Fig. 1 is a schema, explains and generally rolls the method for manufacture of prolonging aluminum alloy sheet at present.
Fig. 2 is a schema, explains that the manufacturing processed of prolonging aluminum alloy sheet is rolled in the making of TOHKEMY P2007-254825 number " Al-Si-Mg (Al-Mg-Si) alloy " patent case announcement.
Fig. 3 is a schema, and a preferred embodiment of the method for manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention is described.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated:
Consult Fig. 3, a preferred embodiment of the method for manufacture of low ductility anisotropy rolling aluminum alloy sheet of the present invention comprises a cast molding step 31, and rolls and prolong step 32, a recovery annealing step 33 and a modified step 34.
At first carry out this cast molding step 31; Be similar to present rolling and prolong the processing procedure of aluminum alloy sheet, this cast molding step 31 is with the fused aluminium alloy stock, is molded into an aluminium base with the direct chill casting method; In this example; The composition of aluminium alloy stock calculates with the total weight percent of 100 weight %, includes the aluminium of the following iron of 0.3 weight %, the manganese below the 0.3 weight %, silicon, unavoidable impurity below the 0.1 weight % and surplus below the 0.2 weight %, speaks by the book; The aluminium alloy stock composition that present embodiment adopts comprises the aluminium of silicon, unavoidable impurity below the total amount 0.1 weight % and surplus of manganese, the 0.07 weight % of iron, the 0.23 weight % of 0.24 weight %; Because the direct chill casting method has been that industry institute is known, and is not the emphasis place of the present invention's creation, no longer adds to give unnecessary details at this.
Carrying out this then rolls and prolongs step 32; Prolong this aluminium base prior to hot rolling between 300 ℃ to 500 ℃; The thickness of this aluminium base is declined to a great extent, carry out thickness reduction rate then, mold aluminium flake work in-process cold rolling the prolonging more than 85%; This step mainly molds corresponding aluminium flake work in-process according to production specification, improves the half-finished intensity of aluminium flake through the cold rolling amount of prolonging of height simultaneously.
Then carry out recovery annealing step 33; To pass through this rolls and prolongs the aluminium flake work in-process that step 32 molds and bestow 230 ℃ to 270 ℃, 1 hour to 6 hours recovery annealing (recovery annealing); Make the dislocation in the aluminium flake work in-process obtain preferable arrangement through recovery annealing, and eliminate residual stress.
Carry out this modified step 34 at last,, let the half-finished ductility anisotropy of aluminium flake desired value R simultaneously with 2% to 10% roll and prolong dependent variable and roll and prolong recovery annealing aluminium flake work in-process later
(0/45)≤40%, R
(90/45)≤25%, make low ductility anisotropy rolling aluminum alloy sheet.
Then; Four invention examples so that component is identical (are prolonged aluminum alloy sheet according to produced the rolling of the method for manufacture of the invention described above; But process parameter is slightly variant) with three comparative examples (different method of manufacture), the ductility anisotropy performance of prolonging aluminum alloy sheet according to produced the rolling of the method for manufacture of the invention described above is described.
Prolonging aluminum alloy sheet according to rolling of the method for manufacture manufacturing of the invention described above is respectively:
Invent routine 1-and roll and prolong in the step 32 implement cold rolling to prolong thickness reduction rate be 98%, the recovery annealing temperature of implementing in the recovery annealing step 33 is 240 ℃, and it is 5% that rolling of implementing in the modified step 34 prolonged dependent variable.
Invent routine 2-and roll and prolong in the step 32 implement cold rolling to prolong thickness reduction rate be 98%, the recovery annealing temperature of implementing in the recovery annealing step 33 is 255 ℃, and it is 2.5% that rolling of implementing in the modified step 34 prolonged dependent variable.
Invent routine 3-and roll and prolong in the step 32 implement cold rolling to prolong thickness reduction rate be 98%, the recovery annealing temperature of implementing in the recovery annealing step 33 is 255 ℃, and it is 5% that rolling of implementing in the modified step 34 prolonged dependent variable.
Invent routine 4-and roll and prolong in the step 32 implement cold rolling to prolong thickness reduction rate be 98%, the recovery annealing temperature of implementing in the recovery annealing step 33 is 255 ℃, and it is 10% that rolling of implementing in the modified step 34 prolonged dependent variable.
In addition, 1,2 of comparative examples are without the aluminum alloy sheet of implementing modified step 34 made, and in other words, it all is 0% that the rolling of modified step 34 prolonged dependent variable, and comparative example 3 then is to prolong dependent variable and be increased to 13% implementing rolling in the modified step 34.
With the manufacturing processed characteristic and final ductility anisotropy test performance of foregoing invention example 1 to 4 with comparative example 1 to 3, arrangement is like table 1.
Table 1 the application invents material and compares with the incorgruous performance of the ductility that compares material
| Test piece number | The cold rolling thickness reduction rate of prolonging | Annealing temperature | Roll and prolong dependent variable | R (0/45) | R (90/45) |
| Invention example 1 | 98％ | 240℃ | 5％ | 38.9％ | 5.4％ |
| Comparative example 1 | 98％ | 240℃ | Do not have | 80.8％ | 67.7％ |
| Comparative example 2 | 98％ | 255℃ | Do not have | 88.3％ | 74.0％ |
| Invention example 2 | 98％ | 255℃ | 2.5％ | 22.1％ | 0.4％ |
| Invention example 3 | 98％ | 255℃ | 5％ | 35.5％ | 19.6％ |
| Invention example 4 | 98％ | 255℃ | 10％ | 38.3％ | 20.3％ |
| Comparative example 3 | 98％ | 252℃ | 13％ | 43.7％ | 9.7％ |
Wherein: R
(0/45)With R
(90/45)Be the anisotropic desired value of ductility, and
R
(0/45)＝((R
(0)-R(45))/R
(0))×100％...............(1)
R
(90/45)＝((R
(90)-R
(45))/R
(90))×100％..................(2)
R in formula (1) and the formula (2)
(0), R
(90)With R
(45)Represent aluminum alloy sheet respectively in tensile test, parallel roll prolong direction, vertically roll prolong direction with and roll and prolong the elongation that direction is 45 degree aluminium flake directions.
Relatively can know by invention example 1 and comparative example 1, invent the R of routine 1 aluminum alloy sheet
(0/45)With R
(90/45)Desired value is dropped rapidly to below 40% than comparative example 1, has reduced fully more than the twice, highlights the present invention and prolongs through 2% to 10% rolling of dependent variable of modified step 34 really, effectively improves the ductility anisotropy of aluminum alloy sheet.
The aluminum alloy sheet annealing temperature of comparative example 2 is increased to 255 ℃, its R from 240 ℃
(0/45)With R
(90/45)Desired value is but still keeping 88.3% and 74.0%; This shows only against improving annealing temperature; Or increase by one anneal (just being similar to the technology that TOHKEMY P2007-254825 number " Al-Si-Mg (Al-Mg-Si) alloy " patent case disclosed) more, can't reach to reduce and roll the anisotropic purpose of the ductility of prolonging aluminum alloy sheet.
Can know by the experimental result of invention example 2,3,4 again, impose on to roll and prolong rolling of aluminum alloy sheet and prolong dependent variable and be respectively 2.5%, 5% and 10%, and R
(0/45)With R
(90/45)Desired value also is lower than 40% and 25% respectively, and can be known by comparative example 3 again, rolls and prolongs dependent variable above 10% o'clock, R
(0/45)Also be increased to 43.7% thereupon, surpass 40% scope and can't reach and reduce the anisotropic effect of ductility, prove that really the present invention prolongs with 2% to 10% rolling of dependent variable of modified step 34, can effectively improve the ductility anisotropy of aluminum alloy sheet.
In sum; The present invention proposes the method for manufacture of the simple low ductility anisotropy rolling aluminum alloy sheet of a kind of processing procedure really; Mainly through modified step 34 pair through hot rolling prolong, cold rollingly prolong, the aluminium flake work in-process of recovery annealing roll and prolong dependent variable and be controlled at 2% to 10% roll and prolong modifiedly, make simultaneously to roll and prolong ductility anisotropy index that rolling after modified prolong aluminum alloy sheet at R
(0/45)≤40%, R
(90/45)In≤25% the scope; Make to be formed with the dislocation of q.s in the aluminium flake of output, and can avoid the phenomenon of deflection concentration of local with tension strain homodisperse to aluminium flake inside everywhere; And then improve the anisotropic problem of ductility; And roll under the intensity prerequisite of prolonging aluminum alloy sheet possessing, promote the low ductile of output and roll and prolong aluminum alloy sheet, reach the object of the invention really.
Claims (3)
1. the method for manufacture of a low ductility anisotropy rolling aluminum alloy sheet; Comprise: a cast molding step and is rolled and is prolonged step; This cast molding step is molded into an aluminium base with the aluminium alloy stock of a molten with the direct chill casting method; This rolls and prolongs the step hot rolling and prolong and carry out once cold rolling behind this aluminium base and prolong, and making this aluminium blank molding is aluminium flake work in-process, it is characterized in that; This method of manufacture also comprises a recovery annealing step and a modified step; This recovery annealing step will be accomplished this and roll the aluminium flake work in-process that prolong step and bestow recovery annealing, and this modified step is prolonged dependent variable and rolled and prolong the aluminium flake work in-process of accomplishing this recovery annealing step with 2% to 10% roll, and makes this low ductility anisotropy rolling aluminum alloy sheet; The composition of this aluminium alloy stock calculates with the total weight percent of 100 weight %, includes iron, the manganese below the 0.3 weight %, the silicon below the 0.2 weight %, the impurity below the 0.1 weight % and the aluminium of surplus below the 0.3 weight %.
2. the method for manufacture of low ductility anisotropy rolling aluminum alloy sheet according to claim 1 is characterized in that, in this modified step, rolls and prolongs the ductility anisotropy desired value R that makes aluminium flake after the aluminium flake of accomplishing this recovery annealing step
(0/45)≤40%, R
(90/45)≤25%.
3. the method for manufacture of low ductility anisotropy rolling aluminum alloy sheet according to claim 2 is characterized in that, this rolls, and to prolong the cold rolling thickness reduction rate of prolonging that step carries out be more than 85%.
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| CN102108477A (en) * | 2011-03-11 | 2011-06-29 | 常州腾龙精密铝业有限公司 | Heat treatment method of aluminum material |
| TWI535868B (en) * | 2014-12-03 | 2016-06-01 | China Steel Corp | Manufacture of high strength aluminum sheets |
| CN104502166A (en) * | 2014-12-15 | 2015-04-08 | 首钢总公司 | Method of preparing sample wafer capable of representing grain sliding of steel and iron materials |
| CN105603168A (en) * | 2015-11-26 | 2016-05-25 | 佛山市高明区杨和金属材料专业镇技术创新中心 | Toughening treatment method for metal material |
| TWI601836B (en) * | 2016-06-02 | 2017-10-11 | 中國鋼鐵股份有限公司 | Method for manufacturing aluminum sheet |
| CN110565095A (en) * | 2019-09-25 | 2019-12-13 | 华为技术有限公司 | Workpiece of electronic equipment, preparation method, shell and electronic equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269844A (en) * | 1997-09-11 | 2000-10-11 | 日本轻金属株式会社 | Process for producing aluminium alloy sheet |
| CN1331762A (en) * | 1998-12-22 | 2002-01-16 | 克里斯铝轧制品有限公司 | Damage tolerant aluminium alloy product and method of its manufacture |
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2009
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269844A (en) * | 1997-09-11 | 2000-10-11 | 日本轻金属株式会社 | Process for producing aluminium alloy sheet |
| CN1331762A (en) * | 1998-12-22 | 2002-01-16 | 克里斯铝轧制品有限公司 | Damage tolerant aluminium alloy product and method of its manufacture |
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