CN103924173A - Multistage creep age forming method for Al-Cu-Mg series aluminum alloy panel - Google Patents
Multistage creep age forming method for Al-Cu-Mg series aluminum alloy panel Download PDFInfo
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- CN103924173A CN103924173A CN201410199270.XA CN201410199270A CN103924173A CN 103924173 A CN103924173 A CN 103924173A CN 201410199270 A CN201410199270 A CN 201410199270A CN 103924173 A CN103924173 A CN 103924173A
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Abstract
The invention discloses a multistage creep age forming method for an Al-Cu-Mg series aluminum alloy panel. The method includes the steps that firstly, water quenching is conducted on the Al-Cu-Mg series aluminum alloy panel with the thickness ranging from 2 mm to 35 mm after solid solution processing is conducted on the Al-Cu-Mg series aluminum alloy panel at the temperature ranging from 490 DEG C to 505 DEG C for 30 minutes to 90 minutes, 1 percent to 5 percent of cold rolling is conducted, and then natural aging processing is conducted for 100 hours to 200 hours; secondly, the first stage of creep age forming is conducted, wherein the creep age temperature ranges from 140 DEG C to 160 DEG C, the applied stress ranges from 170 MPa to 230 MPa, and the time ranges from 10 hours to 14 hours; thirdly, the second stage of creep age forming is conducted, wherein the creep age temperature ranges from 160 DEG C to 200 DEG C, the applied stress ranges from 170 MPa to 230 MPa, and the time ranges from 10 hours to 14 hours; fourthly, the panel is unloaded from a die. When the Al-Cu-Mg series aluminum alloy panel is processed through the method, the mechanical property and the corrosion resistance of the aluminum alloy panel can be effectively improved.
Description
Technical field
The present invention relates to the multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material, belong to nonferrous materials processing engineering technology field.
Background technology
Al-Cu-Mg line aluminium alloy belongs to heat-treatable strengthened duralumin, there is the advantages such as high strength, low-gravity, good thermotolerance and fatigue strength, be the good high-strength structure aluminium alloy of a kind of over-all properties, be widely used as wallboard, the covering class formation part material of space flight and aviation.Integral panel manufacturing technology is the study hotspot of space flight and aviation part in recent years, and integral panel technology, compared with traditional aviation component manufacturing technology, has that fatigue strength greatly improves, weight greatly reduces, stopping property greatly strengthens.Creep age forming technology belongs to the one of integral panel manufacturing technology, applicable to manufacturing the large-scale Integral Wing Panel of Varying-thickness large size.The entirety band muscle and the Varying-thickness complex configuration structural entity wallboard members that adopt creep ageing technology to be shaped, have the advantages such as unrelieved stress is little, dimensional precision is high, the manufacturing cycle is short.Research shows, the main strengthening phase of Al-Cu-Mg line aluminium alloy is s phase (Al
2cuMg), adopt conventional ageing treatment (artificial aging processing), as T6 institution of prescription, can obtain higher yield strength, but in forming process, there is the shortcomings such as unrelieved stress is higher, forming period is long, reduced the service life of alloy components.Adopt the processing of single-stage creep ageing, can obtain higher obdurability and less unrelieved stress, but the corrosion resistance nature of alloy is on the low side.And what in single-stage creep ageing process, produce separates out position and will cause sheet alloy anisotropic degree to strengthen to effect, has increased the ununiformity of component performance.Therefore need a kind of multistage creep age forming method of the Al-Cu-Mg of being suitable for line aluminium alloy sheet material, to obtain good shape/property cooperative development in wallboard monolithic molding process.
Summary of the invention
The object of the present invention is to provide a kind of integrally formed multistage creep ageing method of Al-Cu-Mg line aluminium alloy sheet material that is applicable to, solved shape/property cooperative development in current integral panel forming process, improved the bottleneck problem of mechanical property and corrosion resistance nature simultaneously.
For achieving the above object, the technical solution used in the present invention is: a kind of strengthening phase by regulation and control Al-Cu-Mg line aluminium alloy, the multistage creep age forming method of precipitate free zone.The concrete steps of the method are:
Step 1: the Al-Cu-Mg line aluminium alloy sheet material thick to 2～35mm carries out the solution treatment of 30～90 minutes under 490～505 DEG C of temperature condition, then shrend, carry out deformation rate and be thereafter 1～5% cold rolling, finally carry out the natural aging treatment of 100～200 hours;
Step 2: to carrying out first step creep age forming through step 1 sheet alloy after treatment, wherein first step creep ageing temperature is 140～160 DEG C, and applied stress is 170～230MPa, and curring time is 10～14 hours;
Step 3: to carrying out second stage creep age forming through step 2 sheet alloy after treatment, wherein creep ageing temperature in the second stage is 160～200 DEG C, and applied stress is 170～230MPa, and curring time is 10～14 hours.
The present invention has following consideration in thermal treatment: by solid solution, quenching and natural aging treatment, and introducing portion dislocation homogenizing tissue in alloy; During first step creep ageing is processed, the abundant forming core mutually of the precipitation strength in alloy, makes the phase core that in alloy, concrete a large amount of disperses distribute, simultaneously by the disperse educt of phase core, reduce precipitated phase separate out position to; During second stage creep ageing is processed, the change of aging temp and plus load, impels in alloy and can increase in precipitated phase, and precipitated phase is broken through forming core barrier, grows up rapidly; The change in the external heat field of force simultaneously causes alloy Dislocations translational speed to increase, and impel the precipitated phase in alloy to be tiny equally distributed feature, and Grain Boundary Precipitates is characterized by discontinuously arranged state.This heat treatment mode has regulated and controled the behavior of separating out of precipitated phase in alloy effectively, has improved mechanical property and the corrosion resistance nature of alloy.
The present invention adopts above scheme, has the following advantages: this invention has been carried out multistage creep ageing processing to Al-Cu-Mg line aluminium alloy sheet material, in first step creep ageing treating processes, and the abundant forming core of precipitated phase in alloy; In the creep ageing process of the second stage, regulate and control the behavior of separating out of precipitated phase by the change in the external heat field of force, carry heavy alloyed mechanical property and corrosion resistance nature.The method is simple to operate, and effect is remarkable, compares single-stage creep ageing and artificial aging, is conducive to improve mechanical property and the corrosion resistance nature of Al-Cu-Mg line aluminium alloy sheet material simultaneously, saves material, and reduces the production cycle.
The hardness of indication Al-Cu-Mg line aluminium alloy sheet material of the present invention is on TMVS-1 Vickers hardness tester, to adopt trying hard to keep of 2.94KN to carry 15s test.Electrokinetic potential cyclic polarization corrosion test and electrochemical impedance experiment are to carry out on CHI660C electrochemical workstation.
Brief description of the drawings
The schema of Fig. 1 the inventive method processing sample
The TEM bright field image photo of Fig. 2 Al-Cu-Mg line aluminium alloy: (a), (b) be without the intracrystalline of the inventive method processing and Grain Boundary Precipitates figure; (c), (d) is intracrystalline and Grain Boundary Precipitates figure through the inventive method processing
The galvanic corrosion pattern SEM figure of Fig. 3 Al-Cu-Mg line aluminium alloy: (a), (b) be the erosion profile figure without processing of the present invention; (c), (d) is for processing erosion profile figure through the present invention
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is the multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material, taking the Al-Cu-Mg line aluminium alloy of alloying constituent shown in table 1 as example, introduces in detail the multistage creep age forming method the present invention relates to.The Vickers' hardness that in each example, hardness test adopts GB/T4340.4-2009 to carry out test materials is measured.Electrochemical corrosion performance test of the present invention adopts GB/T24196-2009 to carry out the measurement of electrokinetic potential polarization curve.
The alloying constituent of material therefor in table 1 example of the present invention
Embodiment 1
A2.54mm heavy-gauge sheeting adopts 495 DEG C of solution treatment within 60 minutes, then to carry out shrend, carries out subsequently deformation rate and be the natural aging treatment of 3% cold rolling and 150 hours.First step creep ageing temperature is 150 DEG C, and applied stress is 185MPa, and curring time is 12 hours.Second stage creep ageing temperature is 180 DEG C, and applied stress is 185MPa, and curring time is 12 hours.
Embodiment 2
B2.54mm heavy-gauge sheeting adopts 495 DEG C of solution treatment within 60 minutes, then to carry out shrend, carries out subsequently deformation rate and be the natural aging treatment of 3% cold rolling and 150 hours.First step creep ageing temperature is 150 DEG C, and applied stress is 205MPa, and curring time is 12 hours.Second stage creep ageing temperature is 180 DEG C, and applied stress is 185MPa, and curring time is 12 hours.
Embodiment 3
C2.54mm heavy-gauge sheeting adopts 495 DEG C of solution treatment within 60 minutes, then to carry out shrend, carries out subsequently deformation rate and be the natural aging treatment of 3% cold rolling and 150 hours.First step creep ageing temperature is 150 DEG C, and applied stress is 225MPa, and curring time is 12 hours.Second stage creep ageing temperature is 180 DEG C, and applied stress is 205MPa, and curring time is 12 hours.
Embodiment 4
D2.54mm heavy-gauge sheeting adopts 495 DEG C of solution treatment within 60 minutes, then to carry out shrend, carries out subsequently deformation rate and be the natural aging treatment of 3% cold rolling and 150 hours.First step creep ageing temperature is 150 DEG C, and applied stress is 205MPa, and curring time is 12 hours.Second stage creep ageing temperature is 160 DEG C, and applied stress is 205MPa, and curring time is 12 hours.
Embodiment 5
E2.54mm heavy-gauge sheeting adopts 495 DEG C of solution treatment within 60 minutes, then to carry out shrend, carries out subsequently deformation rate and be the natural aging treatment of 3% cold rolling and 150 hours.Then carry out conventional two-stage time effect processing, first step aging temp is 150 DEG C, and soaking time is 12 hours.Second stage aging temp is 180 DEG C, and soaking time is 12 hours.
Table 2 has provided and has used the vickers hardness number, pitting potential of embodiment of the present invention interalloy, passivation potential and polarization resistance value again.Hence one can see that, and twin-stage creep age forming method of the present invention can be guaranteed desirable mechanical property and corrosion resistance nature effectively.
Table 2 uses hardness and the corrosion resistance of embodiment of the present invention interalloy
Claims (6)
1. the multistage creep age forming method of Al-Cu-Mg line aluminium alloy sheet material, is characterized in that: utilize the creep ageing characteristic of Al-Cu-Mg line aluminium alloy to realize the shaping of sheet material, and obtain desirable over-all properties, the method comprises the following steps:
Step 1: Al-Cu-Mg line aluminium alloy sheet material is carried out to solution treatment, and then shrend, carries out thereafter cold rollingly, finally carries out natural aging treatment;
Step 2: to carrying out first step creep age forming through step 1 sheet alloy after treatment;
Step 3: to carrying out second stage creep age forming through step 2 sheet alloy after treatment;
Step 4: unload sheet material from mould.
2. the method for claim 1, is characterized in that: the Al-Cu-Mg line aluminium alloy sheet metal thickness described in step 1 is 2～35mm.
3. the method for claim 1, is characterized in that: the solid solution temperature described in step 1 is 490～505 DEG C, and the solution treatment time is 30～90 minutes.
4. the method for claim 1, is characterized in that: the cold roller and deformed rate described in step 1 is 1～5%, and the natural aging treatment time is 100～200 hours.
5. the method for claim 1, is characterized in that: the creep ageing temperature described in step 2 is 140～160 DEG C, and applied stress is 170～230MPa, and curring time is 10～14 hours.
6. the method for claim 1, is characterized in that: the creep ageing temperature described in step 3 is 160～200 DEG C, and applied stress is 170～230MPa, and curring time is 10～14 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388857A (en) * | 2014-10-21 | 2015-03-04 | 西北工业大学 | Method for overaging re-solution creep age forming of Al-Zn-Mg-Cu series aluminum alloy plate |
| CN107151767A (en) * | 2017-01-20 | 2017-09-12 | 中国科学院金属研究所 | A kind of synchronous Strengthening and Toughening processing technology of Al Cu Mg alloys |
| CN108265247A (en) * | 2018-01-25 | 2018-07-10 | 湖南大学 | Improve the aging technique of intensity non-uniformity after 7 line aluminium alloy of large scale quenches |
| CN109487186A (en) * | 2018-12-28 | 2019-03-19 | 中南大学 | A kind of method of creep age forming aluminium alloy element shape/property collaboration optimization |
| CN109487185A (en) * | 2018-12-28 | 2019-03-19 | 中南大学 | A kind of progressive creep age forming technique of Complex Aluminum Alloy component |
| CN113481446A (en) * | 2021-07-23 | 2021-10-08 | 中南大学 | Circulating pre-deformation method for improving creep age forming capability and performance of aluminum alloy |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388857A (en) * | 2014-10-21 | 2015-03-04 | 西北工业大学 | Method for overaging re-solution creep age forming of Al-Zn-Mg-Cu series aluminum alloy plate |
| CN104388857B (en) * | 2014-10-21 | 2017-10-27 | 西北工业大学 | A kind of Al Zn Mg Cu line aluminium alloy sheet materials overaging solid solution creep age forming method again |
| CN107151767A (en) * | 2017-01-20 | 2017-09-12 | 中国科学院金属研究所 | A kind of synchronous Strengthening and Toughening processing technology of Al Cu Mg alloys |
| CN108265247A (en) * | 2018-01-25 | 2018-07-10 | 湖南大学 | Improve the aging technique of intensity non-uniformity after 7 line aluminium alloy of large scale quenches |
| CN108265247B (en) * | 2018-01-25 | 2020-03-10 | 湖南大学 | Aging process for improving strength nonuniformity of large-size 7-series aluminum alloy after quenching |
| CN109487186A (en) * | 2018-12-28 | 2019-03-19 | 中南大学 | A kind of method of creep age forming aluminium alloy element shape/property collaboration optimization |
| CN109487185A (en) * | 2018-12-28 | 2019-03-19 | 中南大学 | A kind of progressive creep age forming technique of Complex Aluminum Alloy component |
| 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 |
| CN109487185B (en) * | 2018-12-28 | 2021-07-20 | 中南大学 | Progressive creep age forming process of complex aluminum alloy component |
| CN113481446A (en) * | 2021-07-23 | 2021-10-08 | 中南大学 | Circulating pre-deformation method for improving creep age forming capability and performance of aluminum alloy |
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