CN103924173B - The multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material - Google Patents
The multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material Download PDFInfo
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Abstract
The invention discloses the multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material, the step of its method comprises: (1) by Al-Cu-Mg line aluminium alloy sheet material thick for 2 ~ 35mm 490 ~ 505 DEG C of solution treatment shrends after 30 ~ 90 minutes, then carry out 1 ~ 5% cold rolling, then carry out 100 ~ 200 hours natural aging treatment; (2) carry out first step creep age forming, creep ageing temperature is 140 ~ 160 DEG C, and applied stress is 170 ~ 230MPa, and the time is 10 ~ 14 hours; (3) carry out second stage creep age forming, creep ageing temperature is 160 ~ 200 DEG C, and applied stress is 170 ~ 230MPa, and the time is 10 ~ 14 hours; (4) from mould, sheet material is unloaded.Utilize the inventive method process Al-Cu-Mg line aluminium alloy sheet material, effectively can improve mechanical property and the corrosion resistance nature of aluminum alloy plate materials.
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 high strength, low-gravity, the preferably advantage such as thermotolerance and fatigue strength, be the good high-strength structure aluminium alloy of a kind of over-all properties, be widely used as the wallboard of space flight and aviation, covering class formation part material.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, is applicable to and manufactures the large-scale Integral Wing Panel of Varying-thickness large size.The unitary strip muscle adopting creep ageing technology to be shaped and Varying-thickness complex configuration structure integral panel component, 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 process), as T6 institution of prescription, higher yield strength can be obtained, but in forming process, there is the shortcomings such as unrelieved stress is higher, forming period is long, reduce the service life of alloy components.Adopt the process of single-stage creep ageing, higher obdurability and less unrelieved stress can be obtained, but the corrosion resistance nature of alloy is on the low side.And the precipitation position produced in single-stage creep ageing process will cause sheet alloy anisotropic degree to strengthen to effect, increase the ununiformity of component performance.Therefore a kind of multistage creep age forming method being suitable for Al-Cu-Mg line aluminium alloy sheet material is needed, to obtaining 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 applicable integrally formed multistage creep ageing method of Al-Cu-Mg line aluminium alloy sheet material, solve the shape/property cooperative development in current integral panel forming process, improve 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 by the strengthening phase of 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 solution treatment Al-Cu-Mg line aluminium alloy sheet material that 2 ~ 35mm is thick being carried out under 490 ~ 505 DEG C of temperature condition to 30 ~ 90 minutes, then shrend, thereafter carry out deformation rate be 1 ~ 5% cold rolling, finally carry out the natural aging treatment of 100 ~ 200 hours;
Step 2: carry out first step creep age forming to the sheet alloy after step 1 processes, 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: carry out second stage creep age forming to the sheet alloy after step 2 processes, 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, introducing portion dislocation in alloy homogenizing tissue; In the process of first step creep ageing, the abundant forming core mutually of the precipitation strength in alloy, makes the phase core of concrete a large amount of Dispersed precipitate in alloy, simultaneously by the disperse educt of phase core, the precipitation position reducing precipitated phase to; In the creep ageing process of the second stage, the change of aging temp and plus load, impels in alloy and can increase in precipitated phase, and precipitated phase breaks 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 the feature that fine uniform distributes, and Grain Boundary Precipitates is characterized by discontinuously arranged state.This heat treatment mode has regulated and controled the pick-up behavior of precipitated phase in alloy effectively, improves mechanical property and the corrosion resistance nature of alloy.
The present invention adopts above scheme, has the following advantages: this invention has carried out multistage creep ageing process to Al-Cu-Mg line aluminium alloy sheet material, in first step creep ageing treating processes, and the abundant forming core of the precipitated phase in alloy; In the creep ageing process of the second stage, by the pick-up behavior of the change regulation and control precipitated phase in the external heat field of force, carry heavy alloyed mechanical property and corrosion resistance nature.The method is simple to operate, Be very effective, compares single-stage creep ageing and artificial aging, is conducive to the mechanical property and the corrosion resistance nature that improve 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, adopt trying hard to keep of 2.94KN to carry 15s test.Electrokinetic potential cyclic polarization corrosion test and electrochemical impedance experiment carry out on CHI660C electrochemical workstation.
Accompanying drawing explanation
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) are intracrystalline without the inventive method process and Grain Boundary Precipitates figure; C (), (d) are intracrystalline through the inventive method process and Grain Boundary Precipitates figure
The galvanic corrosion pattern SEM of Fig. 3 Al-Cu-Mg line aluminium alloy schemes: (a), (b) are the erosion profile figure without process of the present invention; C (), (d) are through process erosion profile figure of 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, for the Al-Cu-Mg line aluminium alloy of alloying constituent shown in table 1, introduces the multistage creep age forming method that the present invention relates in detail.The Vickers' hardness that in each example, hardness test adopts GB/T4340.4-2009 to carry out test materials measures.Electrochemical corrosion performance test of the present invention adopts GB/T24196-2009 to carry out the measurement of dynamic 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 then to carry out shrend in 60 minutes, carries out the natural aging treatment that deformation rate is 3% cold rolling and 150 hours subsequently.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 then to carry out shrend in 60 minutes, carries out the natural aging treatment that deformation rate is 3% cold rolling and 150 hours subsequently.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 then to carry out shrend in 60 minutes, carries out the natural aging treatment that deformation rate is 3% cold rolling and 150 hours subsequently.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 then to carry out shrend in 60 minutes, carries out the natural aging treatment that deformation rate is 3% cold rolling and 150 hours subsequently.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 then to carry out shrend in 60 minutes, carries out the natural aging treatment that deformation rate is 3% cold rolling and 150 hours subsequently.Then carry out conventional two-stage time effect process, 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 give use embodiment of the present invention interalloy vickers hardness number, pitting potential, again passivation potential and polarization resistance value.It can thus be appreciated that twin-stage creep age forming method of the present invention can guarantee desirable mechanical property and corrosion resistance nature effectively.
Table 2 uses hardness and the corrosion resistance of embodiment of the present invention interalloy
Claims (4)
1. the multistage creep age forming method of Al-Cu-Mg line aluminium alloy sheet material, the method comprises the following steps:
Step 1: 490 ~ 550 DEG C are carried out to Al-Cu-Mg line aluminium alloy sheet material, the solution treatment of 30 ~ 90 minutes, then shrend, carry out thereafter 1 ~ 5% cold rolling, finally carry out the natural aging treatment of 100 ~ 200 hours;
Step 2: first step creep age forming is carried out to the sheet alloy after step 1 processes;
Step 3: second stage creep age forming is carried out to the sheet alloy after step 2 processes;
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 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.
4. 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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| 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 |
| 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 |
| CN109487185B (en) * | 2018-12-28 | 2021-07-20 | 中南大学 | Progressive creep age forming process 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 |
| CN113481446B (en) * | 2021-07-23 | 2022-03-22 | 中南大学 | Circulating pre-deformation method for improving creep age forming capability and performance of aluminum alloy |
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| EP0829552A1 (en) * | 1996-09-11 | 1998-03-18 | Aluminum Company Of America | Aluminium alloy products suited for commercial jet aircraft wing members |
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| CN102978549A (en) * | 2012-11-21 | 2013-03-20 | 中南大学 | Method for bending creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate |
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| US5168169A (en) * | 1991-06-10 | 1992-12-01 | Avco Corporation | Method of tool development |
| US5630889A (en) * | 1995-03-22 | 1997-05-20 | Aluminum Company Of America | Vanadium-free aluminum alloy suitable for extruded aerospace products |
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| CA512889A (en) * | 1955-05-17 | H. Harrington Richards | Stress-aging process | |
| RU2048591C1 (en) * | 1994-04-27 | 1995-11-20 | Всероссийский научно-исследовательский институт авиационных материалов | Method for heat treatment of semifinished products from deformable aluminium-lithium alloys |
| EP0829552A1 (en) * | 1996-09-11 | 1998-03-18 | Aluminum Company Of America | Aluminium alloy products suited for commercial jet aircraft wing members |
| CN102912268A (en) * | 2012-09-20 | 2013-02-06 | 中南大学 | Creep aging forming method for Al-Cu-Mg series alloy sheet material |
| CN102978549A (en) * | 2012-11-21 | 2013-03-20 | 中南大学 | Method for bending creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate |
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| Effects of creep-aging processing on the corrosion resistance and mechanical properties of an Al-Cu-Mg alloy;Y.C.Lin et al.;《Materials Science & Engineering A》;20140322;第605卷;第2节 * |
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