CN104404414B - A kind of 7075 aluminum alloy plate materials creep age forming methods - Google Patents
A kind of 7075 aluminum alloy plate materials creep age forming methods Download PDFInfo
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- CN104404414B CN104404414B CN201410741289.2A CN201410741289A CN104404414B CN 104404414 B CN104404414 B CN 104404414B CN 201410741289 A CN201410741289 A CN 201410741289A CN 104404414 B CN104404414 B CN 104404414B
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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
- C22F1/053—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 zinc as the next major constituent
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Abstract
The invention discloses a kind of 7075 aluminum alloy plate materials creep age forming methods, the step of method, includes：(1) 7075 aluminum alloy plate materials of 2~40mm thickness are carried out to solution treatment in 30~90 minutes at 466~480 DEG C, then water quenching then carries out 1~5% predeformation, finally carries out 80~120 DEG C, artificial aging processing in 6~24 hours；(2) recurrence processing is carried out, the temperature for returning processing is 160~200 DEG C, and soaking time is 20~180 minutes, then carries out room temperature water quenching；(3) then plank is placed in mold and fixed by the predeformation that will be returned treated plank and carry out 1~5%；(4) creep age forming is carried out, creep age forming temperature is 120~160 DEG C, and applied stress is 200~260MPa, and curring time is 12~24 hours；(5) plank is unloaded from mold.The corrosion resistance of 7075 aluminum alloy plate materials can be effectively improved while ensureing aluminum alloy plate materials intensity by handling 7075 aluminum alloy plate materials using the method for the present invention.
Description
Technical field
The present invention relates to a kind of creep age forming methods of 7075 aluminum alloy plate materials, belong to nonferrous materials processing work
Journey technical field.
Technical background
7075 aluminium alloys belong to heat-treatable strengthened high-strength aluminum alloy, have it is higher it is strong/again than, good hot-working
Property and the advantages that high fatigue toughness, become the critical material of modern aerospace equipment, be widely used in aircraft wing wall
The manufacture of plate and fuselage skin.In recent years, aircraft structure is constantly to lightweight, and the long-life, high reliability direction is developed, taken
Performance also gradually rushing into extremes is used as a servant, therefore proposes very high requirement to forming technique.Integral panel manufacturing technology is close
The research hotspot of aerospace part over year, creep age forming method are the ideals for manufacturing complicated band muscle and Varying-thickness integral panel
Technology.Using the Varying-thickness large scale integral panel of this method manufacture is high with forming accuracy, residual stress is small, the manufacturing cycle is short
The advantages that, while production cost can be significantly reduced.Studies have shown that the main hardening constituent of 7075 aluminium alloys is η ' phases (MgZn2), only
Using artificial aging and creep ageing method, although can get higher yield strength, alloy corrosion resistance can be poor.It is logical
When having good toughness and corrosion resistance frequently with 7075 aluminium alloys of multistage aging system processing, but its intensity has dropped 10
~15%.Alloy components prepared by the above method cannot be satisfied practical service demand, and there are remnants in forming process
The shortcomings of stress is high, forming period is long.Therefore it is badly in need of a kind of new method being suitable for 7075 aluminum alloy plate materials creep age formings,
To obtain good shape/property cooperative development in integral panel forming process.
Invention content
The purpose of the present invention is to provide the integrally formed creep ageing methods of suitable 7075 aluminum alloy plate materials of one kind, solve
Shape/property cooperative development in the current integral panel forming process while bottleneck for improving mechanical property and corrosion resistance is asked
Topic.
In order to achieve the above objectives, the technical solution adopted by the present invention is：It is a kind of by regulate and control 7075 aluminium alloys it is transgranular when
Imitate the creep age forming method of hardening constituent, precipitate free zone.This method the specific steps are：
Step 1：7075 aluminum alloy plate materials of 2~40mm thickness are carried out 30~90 minutes under 466~480 DEG C of temperature conditions
Solution treatment, then water quenching then carries out 1~5% predeformation, finally carries out 80~120 DEG C, 6~24 hours artificial
Ageing treatment；
Step 2：To by step 1, treated that sheet alloy carries out recurrence processing, the temperature that returns processing is 160~
200 DEG C, soaking time is 20~180 minutes, then carries out room temperature water quenching；
Step 3：To carrying out 1~5% predeformation by step 2 treated sheet alloy, plank is then placed in mold
In and it is fixed；
Step 4：Creep age forming is carried out to the sheet alloy handled by step 3, creep age forming temperature is 120
~160 DEG C, applied stress is 200~260MPa, and curring time is 12~24 hours.
Step 5：Plank is unloaded from mold.
The present invention has considered below in heat treatment：It is handled, is eliminated residual by solid solution, quenching, predeformation and artificial aging
Residue stress, while introducing portion dislocation in the alloy so that the mutually abundant forming core of ageing strengthening in alloy, the alloy after artificial aging
The transgranular precipitated phase for obtaining small and dispersed, grain boundaries obtain the larger and continuously distributed precipitated phase of size；In recurrence processing, alloy
The hardening constituent of transgranular small and dispersed re-dissolves into matrix, and Grain Boundary Precipitates are roughened；Pass through second of predeformation, plank
Internal residual stress is released, while introducing portion dislocation.In creep ageing processing, transgranular precipitated phase is precipitated again, crystal boundary
Precipitated phase is further roughened, and the precipitation state of the controllable hardening constituent of change of aging temp and plus load promotes alloy transgranular
Precipitated phase is in the feature of small and dispersed distribution, and Grain Boundary Precipitates are characterized as discontinuously arranged state.This processing mode is fine
Ground has regulated and controled the pick-up behavior of precipitated phase, while proof strength, is effectively improved the corrosion resistance of aluminum alloy plate materials.
The present invention uses above scheme, has the characteristics that：7075 aluminum alloy plate materials of invention pair carried out return and it is compacted
Become ageing treatment.In regressive process, transgranular Age-prrcipitation Phase back dissolving, Grain Boundary Precipitates roughening；In creep ageing process
In, regulate and control the pick-up behavior and distribution of precipitated phase again by the change of additional thermal field.Compared to artificial aging and other
Creep ageing, this method is easy to operate, significant effect, is conducive to while ensureing 7075 aluminum alloy plate materials intensity, significantly carry
Its high corrosion resistance, while can save material, shorten the production cycle.
The hardness of meaning aluminum alloy plate materials of the invention is carried 15 seconds using trying hard to keep for 2.94N on TMVS-1 Vickers
Test.Electrokinetic potential cyclic polarization corrosion test carries out on CHI660E electrochemical workstations.
Description of the drawings
Fig. 1 the method for the present invention handles the flow chart of sample
The TEM light field phase photos of 7075 aluminium alloys of Fig. 2：(a), (b) is the transgranular and crystal boundary handled without the method for the present invention
Phasor is precipitated；(c), (d) is the transgranular and Grain Boundary Precipitates figure handled by the method for the present invention
The electrochemical corrosion pattern SEM figures of 7075 aluminium alloys of Fig. 3：(a), (b) is the corrosion handled without the method for the present invention
Shape appearance figure；(c), (d) is the erosion profile figure handled by the present invention
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention is a kind of creep age forming method of 7075 aluminum alloy plate materials, with 7075 of alloying component shown in table 1
For aluminium alloy, creep age forming method of the present invention is discussed in detail.Hardness test uses GB/ in each example
The Vickers hardness that T4340.4-2009 carries out test material measures.Electrochemical corrosion performance test of the present invention uses GB/T24196-
2009 carry out the test of dynamic potential polarization curve.
The alloying component (wt.%) of material therefor in 1 present example of table
Embodiment 1
A 3mm heavy-gauge sheetings carry out water quenching after 1 hour using 470 DEG C of solution treatment, then carry out 3% predeformation and 120
DEG C, artificial aging processing in 24 hours.It is 185 DEG C to return temperature, and the rate of heat addition is 10 DEG C/min, returns heat preservation and stands after twenty minutes
Carry out water quenching.Carry out 3% predeformation.Creep ageing temperature is 120 DEG C, applied stress 260MPa, curring time 24
Hour.
Embodiment 2
B 3mm heavy-gauge sheetings carry out water quenching after 1 hour using 470 DEG C of solution treatment, then carry out 3% predeformation and 120
DEG C, artificial aging processing in 24 hours.It is 185 DEG C to return temperature, and the rate of heat addition is 10 DEG C/min, returns heat preservation and stands after forty minutes
Carry out water quenching.Carry out 3% predeformation.Creep ageing temperature is 120 DEG C, applied stress 260MPa, curring time 24
Hour.
Embodiment 3
C 3mm heavy-gauge sheetings carry out water quenching after 1 hour using 470 DEG C of solution treatment, then carry out 3% predeformation and 120
DEG C, artificial aging processing in 24 hours.It is 185 DEG C to return temperature, and the rate of heat addition is 10 DEG C/mm, returns heat preservation and stands after sixty minutes
Carry out water quenching.Carry out 3% predeformation.Creep ageing temperature is 120 DEG C, applied stress 260MPa, curring time 24
Hour.
Comparative example
D 3mm heavy-gauge sheetings carry out water quenching after 1 hour using 470 DEG C of solution treatment, then carry out 3% pre-treatment,
Creep age forming is carried out again.Creep ageing temperature is 120 DEG C, applied stress 260MPa, and curring time is 24 hours.
Fig. 2 (a) and (b) are that the sheet alloy that handle without the method for the present invention is transgranular with Grain Boundary Precipitates light field phasor.
It can be seen from the figure that the precipitated phase of small and dispersed is evenly distributed in transgranular, and Grain Boundary Precipitates are more coarse, and in continuous
Distribution；Fig. 2 (c) and (d) are that the sheet alloy that handle by the method for the present invention is transgranular with Grain Boundary Precipitates light field phasor.From
It can be seen from the figure that, matrix precipitate is similar to the matrix precipitate handled without the method for the present invention, but Grain Boundary Precipitates
Apparent roughening is in discontinuously arranged state, and has wider precipitate free zone.Therefore, it is handled by the method for the present invention
Afterwards, the intensity of 7075 aluminum alloy plate materials does not significantly decrease, but its corrosion resistance significantly improves (as shown in table 2 and table 3).
Fig. 3 (a) and (b) are the sheet alloy erosion profile figure handled without the method for the present invention.It can be seen from the figure that
Serious corrosion has occurred in alloy, has the point corrosion pit of large-size to occur in plate surface, and point corrosion pit polymerize.Fig. 3
(a) and (b) is the sheet alloy erosion profile figure handled without the method for the present invention.It can be seen from the figure that sheet alloy table
The point corrosion pit that face only isolates on a small quantity occurs, and the size of point corrosion pit is smaller, and depth is shallower.Therefore, by the method for the present invention
After processing, the corrosion resistance of 7075 aluminum alloy plate materials significantly improves.
Table 2 gives using the hardness number of alloy, corrosion potential, pitting potential and crystal boundary in the embodiment of the present invention without analysis
Go out bandwidth.Table 3 gives the hardness number of alloy, corrosion potential, pitting potential and precipitate free zone in comparative example
Width.It follows that the creep age forming method of the present invention can effectively ensure ideal mechanical property and corrosion resistance.
Table 2 is wide using the hardness number of alloy, corrosion potential, pitting potential and precipitate free zone in the embodiment of the present invention
Degree
The hardness number of alloy, corrosion potential, pitting potential and precipitate free zone width in 3 comparative example of table
Claims (2)
1. a kind of 7075 aluminum alloy plate materials creep age forming methods, it is characterised in that：Utilize the creep ageing of 7075 aluminium alloys
Characteristic realizes the forming of plank, and obtains ideal comprehensive performance, and this approach includes the following steps：
Step 1：Solution treatment is carried out to 7075 aluminum alloy plate materials that thickness is 2~40mm, solid solution temperature is 466~480
DEG C, the solution treatment time is 30~90 minutes, then water quenching, then carries out the predeformation that deflection is 1~5%, finally carries out
Artificial aging processing, artificial aging treatment temperature are 80~120 DEG C, and artificial aging processing time is 6~24 hours；
Step 2：To by step 1 treated sheet alloy carries out recurrence processing, it is 160~200 DEG C to return treatment temperature, is protected
The warm time is 20~180 minutes, then carries out room temperature water quenching；
Step 3：To carrying out the predeformation that deflection is 1~5% by step 2 treated sheet alloy, then plank is set
It is in mold and fixed；
Step 4：To by step 3 handle sheet alloy carry out creep age forming, creep age forming temperature be 120~
160 DEG C, applied stress is 200~260MPa, and curring time is 12~24 hours;
Step 5：Plank is unloaded from mold.
2. the method as described in claim 1, it is characterised in that：The Vickers hardness number (HV) of the sheet alloy finally obtained is
176.0 to 189.5, corrosion potential is -0.752 VSCETo -0.716 VSCE, pitting potential be -0.697 VSCETo -0.681
VSCE, precipitate free zone width is 14.3nm to 37.5nm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105033009A (en) * | 2015-07-02 | 2015-11-11 | 芜湖长鹏汽车零部件有限公司 | Aluminum plate performing technology |
| CN106435417B (en) * | 2016-10-27 | 2018-06-15 | 福州大学 | A kind of multistage deformation aging process for improving 7xxx line aluminium alloy comprehensive performances |
| CN107447172A (en) * | 2017-09-26 | 2017-12-08 | 常熟市恒泰精密金属制品有限公司 | The heat treatment method of aluminum alloy plate materials |
| CN108265246A (en) * | 2018-01-25 | 2018-07-10 | 湖南大学 | A kind of method for improving intensity non-uniformity after 7 line aluminium alloy of large scale quenches |
| CN108486508B (en) * | 2018-02-07 | 2020-09-01 | 中南大学 | Efficient creep age forming method for aluminum alloy |
| CN109570321B (en) * | 2018-11-26 | 2020-06-26 | 中南大学 | Method for promoting creep forming |
| CN109402539B (en) * | 2018-11-29 | 2020-02-11 | 四川航天长征装备制造有限公司 | Method for improving radial elongation of aluminum alloy bar |
| CN109487186B (en) * | 2018-12-28 | 2021-02-02 | 中南大学 | Method for shape/performance collaborative optimization of creep age forming aluminum alloy component |
| CN109628813B (en) * | 2019-01-02 | 2021-05-28 | 中南大学 | Method for improving high-temperature creep resistance of rare earth magnesium alloy by using high-density precipitate-free zone |
| CN111940576B (en) * | 2020-07-15 | 2023-04-14 | 北京宇航***工程研究所 | Preparation method of aluminum alloy complex component product with bidirectional curvature |
| CN112267082A (en) * | 2020-09-10 | 2021-01-26 | 西北工业大学 | Alloy plate pulse current regression creep age forming method |
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| CN102912268A (en) * | 2012-09-20 | 2013-02-06 | 中南大学 | Creep aging forming method for Al-Cu-Mg series alloy sheet material |
| CN103614673B (en) * | 2013-04-11 | 2016-08-17 | 中南大学 | One can realize aluminium alloy quick aging heat treatment method |
| CN104152762A (en) * | 2014-08-21 | 2014-11-19 | 东北轻合金有限责任公司 | Method for manufacturing 7B50T7451 aluminum alloy prestretching thick plate for aviation |
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