CN104388857A - Method for overaging re-solution creep age forming of Al-Zn-Mg-Cu series aluminum alloy plate - Google Patents
Method for overaging re-solution creep age forming of Al-Zn-Mg-Cu series aluminum alloy plate Download PDFInfo
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- CN104388857A CN104388857A CN201410583529.0A CN201410583529A CN104388857A CN 104388857 A CN104388857 A CN 104388857A CN 201410583529 A CN201410583529 A CN 201410583529A CN 104388857 A CN104388857 A CN 104388857A
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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
Abstract
The invention relates to a method for overaging re-solution creep age forming of an Al-Zn-Mg-Cu series aluminum alloy plate, belonging to the technical field of plate forming processing. According to the method, a reasonable aging system is adopted during creep age forming so that aluminum alloy complicated elements can be integrally manufactured. The method comprises the following steps: performing solid solution for 0.5-3 hours at 470-480 DEG C and then performing water quenching immediately; subsequently performing first overaging treatment for 6 hours at 115 DEG C and second overaging treatment for 18 hours at 165 DEG C; then performing re-solution for 0.5-3 hours at 470-480 DEG C and then performing water quenching immediately; and finally performing creep age forming for 12-24 hours under 120-165 DEG C. According to the method, the materials simultaneously get high strength and high resistance against stress corrosion fracture during creep age forming so as to achieve the similar effect of retrogression and reaging without the problem of narrow temperature-time window of the retrogression and reaging system during creep age forming, and the method has no limitations on thickness of plates, and is simple and easily implemented.
Description
Technical field
The present invention relates to a kind of Al-Zn-Mg-Cu aluminum alloy sheet material creep age forming method, belong to metal plate forming processing technique field.
Background technology
For meeting aerospace component high-performance, light-weighted requirement, twentieth century rises the fifties, adopts creep age forming technology, drastically increase quality product, shorten the production cycle, reduce manufacturing cost in the manufacturing processed of large complicated integral panel.Creep age forming technology has the advantages that to be shaped and to carry out with thermal treatment simultaneously, the heat-treatable strengthened Al-Cu-Mg system of normal employing and Al-Zn-Mg-Cu aluminum alloy.In creep age forming process, adopt different institutions of prescription, directly affect dimensional precision and the mechanical property of drip molding.The artificial aging system that current Al-Zn-Mg-Cu aluminum alloy is commonly used has single-stage aging, two-stage time effect, regression and re-ageing (three-step aging) etc., all can apply in creep age forming process.
Single-stage creep age forming refers to the forming technology that aging temp keeps constant, material can be made to obtain peak value timeliness (T6) intensity, but under this state, the stress corrosion resistant fracture property of material is poor while sheet material creep forming.The publication No. of people's inventions such as Zhang Xinming is the patent of CN102978545A, a kind of Al-Zn-Mg-Cu aluminum alloy sheet material creep age forming method, single-stage aging system is used in creep age forming, aging temp 120 ~ 150 DEG C, soaking time 2 ~ 36h, this method is under the prerequisite ensureing curring time, and low temperature aged condition causes creep speed lower, forming effect is not obvious, and under hot conditions, overaging reduction mechanical property easily occurs material.Therefore, be necessary to adopt multistage aging technique in creep age forming.
Twin-stage creep age forming refers to that aging temp adopts first low rear high mode, makes material obtain overaging (T7) state.This technique can significantly improve material stress corrosion resistant fracture property, but intensity comparatively peak aged reduction about 15%.The publication No. of people's inventions such as Deng ships is the patent of CN102978549A, a kind of bending creep aging process of Al-Zn-Mg-Cu aluminum alloy plate, two-stage time effect system is applied in creep age forming, one-level system is 100 ~ 140 DEG C of insulation 4 ~ 7h, secondary system is 150 ~ 190 DEG C of insulation 2 ~ 24h, adopts this method material will obtain typical overaging structure and properties.Structure and properties after field Fuquan etc. have studied 7050 aluminium alloy two-stage time effects in " two-stage time effect is on the impact of 7050 aluminum alloy organizations and performance " (China YouSe Acta Metallurgica Sinica 16 volumes the 6th phase in 2006) literary composition, first at 120 DEG C of insulation 6h, again after 165 DEG C of insulation different times, the intensity comparatively peak aged decline 8% ~ 19% of alloy.As can be seen here, two-stage time effect system the creep age forming be not suitable for the aerospace component that the strength of materials has higher requirements.
Regression and re-ageing system combines the advantage of single-stage aging and two-stage time effect, is a kind of three-step aging system.First stage is timeliness at a lower temperature, material is made to obtain peak aged, subordinate phase adopts comparatively high temps to carry out regression treatment, improve stress corrosion resistant fracture property, but intensity declines to some extent, phase III still adopts lesser temps to carry out ageing treatment again, and while continuing to improve stress corrosion resistant fracture property, intensity is gone up.The publication No. of people's inventions such as Deng ships is the patent of CN102978544A, the multistage creep age forming method of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material, regression and re-ageing system is applied in creep age forming, one-level system is 120 DEG C of insulation 24h, secondary system is for returning temperature 150 ~ 170 DEG C insulation 20 ~ 240min, and three tier structure degree is 120 DEG C of insulation 24h.In creep age forming process, regression and re-ageing system is adopted to there are 2 problems: one is according to higher creep age forming temperature (150 ~ 180 DEG C), then corresponding regression treatment temperature should higher (> 180 DEG C), such Temperature-time window that will cause is narrower, usually only have tens seconds to tens minutes, the process furnace used in shaping not easily realizes being rapidly heated of short period of time and lowers the temperature; Two is that regression and re-ageing creep age forming technique is only applicable to sheet moulding, and shorter regression time cannot make slab homogeneous heating.
Therefore, the object of integration manufacture is worked in coordination with for reaching the large complicated integral panel shape property of high strength alumin ium alloy, in the urgent need to the simple and effective Al-Zn-Mg-Cu aluminum alloy creep age forming method of one, the higher strength of materials and good stress corrosion resistant fracture property can be obtained simultaneously, and do not limit by sheet metal thickness, technique is simply easy to realize.
Summary of the invention
For the problem that the Al-Zn-Mg-Cu aluminum alloy creep age forming method at present in conjunction with different institution of prescription shows, the object of the present invention is to provide one not limit by sheet metal thickness, technique is easy to the overaging heavily solid solution creep age forming method realized.And the sheet material utilizing the present invention to be shaped, compared with single-stage creep age forming method, intensity only reduces by 6.5%, and specific conductivity improves 26.5%, namely, while not expendable material intensity, stress corrosion resistant fracture property is significantly improved, under the prerequisite of the easy easy realization of processing condition, play the effect (intensity reduces by 3.7%, and specific conductivity improves 23.6%) of similar regression and re-ageing.
The present invention uses the heavy solid solution aging system of overaging in Al-Zn-Mg-Cu aluminum alloy creep age forming, aluminium alloy grain boundaries precipitated phase is made to keep discontinuously arranged, improve stress corrosion resistant fracture property, and make matrix precipitate, when heavy solid solution, back dissolving occur, again to separate out in follow-up creep age forming process, and then improve the strength of materials.The present invention does not have the problem of regression and re-ageing system narrow process window in creep age forming, can obtain similar effect again.Microtexture research shows, in Al-Zn-Mg-Cu aluminum alloy ag(e)ing process, precipitated phase precipitation order is: supersaturated solid solution → GP district → η ' metastable phase → η equilibrium phase.Material under peak value timeliness (T6) state, intracrystalline Dispersed precipitate have in a large number with the GP district of matrix coherence and the η ' phase of half coherence, intensity is significantly improved, and Grain Boundary Precipitates is the η phase of tiny continuous distribution, and stress corrosion resistant fracture property is poor, regression treatment makes GP district and the η ' phased soln of intracrystalline in short-term, and crystal boundary η phase is grown up in discontinuously arranged, then during timeliness, matrix precipitate is separated out again, recovers original peak value aging strength, under overaging (T7) state, grow up mutually with η ' in the GP district that intracrystalline is tiny, and change thick η ' phase and η phase into, intensity obviously declines, and crystal boundary originally tiny η phase is obviously grown up, and in discontinuously arranged, stress corrosion resistant fracture property is higher, overaging re-solution is similar to the principle of regression treatment, object is identical, all make matrix precipitate back dissolving by high temperature, again separate out to ensure the strength of materials when timeliness again, and the discontinuous Grain Boundary Precipitates of formation large size improves solidity to corrosion, the two adopts peak aged material unlike regression treatment, intracrystalline is tiny GP district and η ' phase, regression treatment in short-term can only be carried out, therefore narrow process window, and material is in overaging state during re-solution, intracrystalline is thick η ' phase and η phase, long re-solution can be carried out, process window is wider, and without the need to the heating installation of rapid temperature rise and drop, technique is easy to realize, back dissolving cannot be there is and form solute atoms in the η phase being just partly greater than critical size, therefore heavily solid solution the intensity of material can a little less than regression and re-ageing system after ageing treatment again, but because overaging organizes grain boundaries η phase larger more discrete, do not dissolve in re-solution, therefore there is better stress corrosion resistant fracture property.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, the step comprised is successively, first by the solution treatment of Al-Zn-Mg-Cu aluminum alloy sheet material, quench subsequently, carry out twin-stage Wetted constructures, solution hardening process again, is fixed subsequently on shaping dies, then under artificial aging temperature, creep age forming is carried out, last air cooling, unloading.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and described solid solution temperature is 470 ~ 480 DEG C, and the time is 0.5 ~ 3h.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and described twice quenching mode is shrend, quenching shift time < 10s.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and in described twin-stage Wetted constructures, one-level aging temp is 115 DEG C, and the time is 6h, and secondary time effect temperature is 165 DEG C, and the time is 18h.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and described re-solution temperature is 470 ~ 480 DEG C, and the time is 0.5 ~ 3h.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and the fixed form of described sheet material on shaping dies is the mechanical grip adopting upper and lower mould, or adopts the autoclave of vacuum bag and die.
The overaging of a kind of Al-Zn-Mg-Cu aluminum alloy sheet material of the present invention is heavily in solid solution creep age forming method, and described creep age forming temperature is 120 ~ 165 DEG C, and the time is 12 ~ 24h.
The present invention is directed in creep age forming process, use peak value timeliness (T6), overaging (T7) and regression and re-ageing (RRA) three kinds of institution of prescription Problems existing, propose overaging heavily solid solution creep age forming method, after as-quenched temper Al-Zn-Mg-Cu aluminum alloy sheet material Wetted constructures, again solid solution, carry out creep age forming again, make material obtain good intensity and stress corrosion resistant fracture property simultaneously, reach the object of similar regression and re-ageing process, overcome regression and re-ageing resolving system and be applied in narrow process window in creep age forming process, be only applicable to the shortcoming of thin plate.
Accompanying drawing explanation
Fig. 1 is the process schematic of four kinds of different creep age forming methods, a () is peak value Age creep age forming, b () is overaging creep age forming, c () is regression and re-ageing creep age forming, (d) is overaging of the present invention heavily solid solution creep age forming.
Fig. 2 is alloy after different creep age forming and overaging of the present invention heavily solid solution creep age forming, the intensity of material, Vickers' hardness and specific conductivity (for weighing stress corrosion resistant fracture property height) etc.
Fig. 3 is the TEM bright field image photo of alloy intracrystalline and adjacent grain boundary after different creep age forming, a () is peak value Age creep age forming, b () is overaging creep age forming, c () is regression and re-ageing creep age forming, (d) is overaging of the present invention heavily solid solution creep age forming.
Embodiment
30mm thick As rolled Al-5.9Zn-1.9Mg-2.5Cu-0.1Zr (mass percent) sheet alloy is adopted, parallel rolling direction processing 3mm and 20mm heavy-gauge sheeting sample in various embodiments of the present invention.Adopt chamber type electric resistance furnace to carry out solution treatment, adopt electric drying oven with forced convection to carry out creep age forming.
Comparative example 1
Creep age forming under peak value timeliness (T6) system.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, creep age forming temperature is 120 DEG C, and curring time is 24h; Shaping bending radius is 1500mm.Fig. 3 (a) for after this peak value Age creep age forming, the TEM bright field image of intracrystalline and adjacent grain boundary.
Comparative example 2
Creep age forming under overaging (T7) system.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, creep age forming initial temperature is 115 DEG C, and curring time is 6h, temperature is elevated to 165 DEG C, continues shaping 18h; Shaping bending radius is 1500mm.Fig. 3 (b) for after this overaging creep age forming, the TEM bright field image of intracrystalline and adjacent grain boundary.
Comparative example 3
Creep age forming under regression and re-ageing (RRA) system.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, artificial aging 24h at 120 DEG C, at being placed in 180 DEG C fast, regression treatment 10min, creep age forming temperature is 120 DEG C, and curring time is 24h; Shaping bending radius is 1500mm.Fig. 3 (c) for after this regression and re-ageing creep age forming, the TEM bright field image of intracrystalline and adjacent grain boundary.
Embodiment 4
Overaging is solid solution creep age forming heavily.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, twin-stage Wetted constructures one-level aging temp is 115 DEG C, and the time is 6h, and secondary time effect temperature is 165 DEG C, time is 18h, heavy solid solubility temperature is 475 DEG C, and the time is 1h, quenching shift time < 10s, creep age forming temperature is 120 DEG C, and curring time is 24h; Shaping bending radius is 1500mm.Fig. 3 (d) for after this overaging heavily solid solution creep age forming, the TEM bright field image of intracrystalline and adjacent grain boundary.
Embodiment 5
Slab overaging is solid solution creep age forming heavily.
Shrend after 20mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, twin-stage Wetted constructures one-level aging temp is 115 DEG C, and the time is 6h, and secondary time effect temperature is 165 DEG C, time is 18h, heavy solid solubility temperature is 475 DEG C, and the time is 1h, quenching shift time < 10s, creep age forming temperature is 120 DEG C, and curring time is 24h; Shaping bending radius is 1200mm.
Embodiment 6
Overaging is solid solution comparatively high temps creep age forming heavily.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, twin-stage Wetted constructures one-level aging temp is 115 DEG C, and the time is 6h, and secondary time effect temperature is 165 DEG C, time is 18h, heavy solid solubility temperature is 475 DEG C, and the time is 1h, quenching shift time < 10s, creep age forming temperature is 165 DEG C, and curring time is 12h; Shaping bending radius is 1500mm.
Comparative example 7
Overaging is the unstressed ageing treatment again of solid solution heavily.
Shrend after 3mm heavy-gauge sheeting sample 475 DEG C of solid solution 1h, quenching shift time < 10s, twin-stage Wetted constructures one-level aging temp is 115 DEG C, and the time is 6h, and secondary time effect temperature is 165 DEG C, time is 18h, heavy solid solubility temperature is 475 DEG C, and the time is 1h, quenching shift time < 10s, aging temp is 120 DEG C again, and the time is 24h.
Claims (8)
1. Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method, it is characterized in that, in Al-Zn-Mg-Cu aluminum alloy sheet material creep age forming process, adopt the heavy solid solution aging system of overaging, comprise the following steps, first solution treatment is carried out to sheet material, and shrend immediately, carry out twin-stage Wetted constructures subsequently, again re-solution is carried out to sheet material, and shrend immediately, be fixed on shaping dies subsequently, then under artificial aging temperature, creep age forming is carried out, last air cooling, unloading.
2. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, described solid solution temperature is 470 ~ 480 DEG C, and the time is 0.5 ~ 3h.
3. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, the quenching mode after described solution treatment is shrend, quenching shift time < 10s.
4. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, in described twin-stage Wetted constructures, one-level aging temp is 115 DEG C, and the time is 6h, secondary time effect temperature is 165 DEG C, and the time is 18h.
5. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, described re-solution temperature is 470 ~ 480 DEG C, and the time is 0.5 ~ 3h.
6. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, the quenching mode after described re-solution is shrend, quenching shift time < 10s.
7. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, described creep age forming temperature is 120 ~ 165 DEG C, and the time is 12 ~ 24h.
8. a kind of Al-Zn-Mg-Cu aluminum alloy sheet material overaging heavily solid solution creep age forming method according to claim 1, it is characterized in that, described aluminum alloy plate materials thickness is unrestricted.
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| CN106435418A (en) * | 2016-11-23 | 2017-02-22 | 重庆大学 | Heat treatment technology for improving intercrystalline corrosion resisting performance and stress corrosion resisting performance of 7-series aluminum alloy |
| CN107513678A (en) * | 2016-06-16 | 2017-12-26 | 中国科学院金属研究所 | The production technology of strong 7 line aluminium alloy section bar and application in a kind of |
| CN112267082A (en) * | 2020-09-10 | 2021-01-26 | 西北工业大学 | Alloy plate pulse current regression creep age forming method |
| CN114293118A (en) * | 2021-12-07 | 2022-04-08 | 华南理工大学 | Non-isothermal creep aging forming method for Al-Zn-Mg-Cu aluminum alloy plate |
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