CN109207888A - A kind of efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal - Google Patents
A kind of efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal Download PDFInfo
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- CN109207888A CN109207888A CN201811128180.6A CN201811128180A CN109207888A CN 109207888 A CN109207888 A CN 109207888A CN 201811128180 A CN201811128180 A CN 201811128180A CN 109207888 A CN109207888 A CN 109207888A
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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 efficient creep age forming methods of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal, the present invention uses reasonable non-isothermal aging system during creep age forming, in conjunction with the deformation of creep, it can be achieved that the forming of aluminum alloy complex component becomes second nature and is integrated.It mainly comprises the following steps first by plate solution treatment, and water quenching immediately.It places at room temperature after a certain period of time, plate is fixed on shaping dies, load, then is gradually increased to creep ageing maximum temperature from room temperature by certain rate of heat addition, be immediately cooled to room temperature by phase same rate, finally unload.Compared to including the triphasic traditional creep age forming process of heating, heat preservation and cooling, the present invention only includes heating and temperature-fall period, insulating process without the long period, total curring time is far fewer than traditional creep age forming time comprising isothermal stage, it can be under the premise of guaranteeing that forming effect is identical, substantially shorten the production cycle, improve forming efficiency, saves production cost.
Description
Technical field
The present invention relates to a kind of efficient creep age forming methods of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal, belong to
Sheet-metal forming processing technique field.
Background technique
Creep age forming be for meet requirement of the aerospace to large-scale integral wall plate parts and grow up one
The advanced sheet material forming technology of kind.During creep ageing, by loading under suitable artificial aging temperature lower than surrender
The external force of intensity makes workpiece generate initial flexible deformation.The load of temperature and external force is then kept, a part of flexible deformation will
It is gradually converted into expendable plastic deformation, inside workpiece generates stress relaxation phenomenon simultaneously, and timeliness analysis occurs for microstructure
Out.After cooling, unloading, remaining flexible deformation is sprung back in workpiece, and is plastically deformed part and is retained, final to obtain
Ageing strengthening aluminium alloy siding with certain curvature.Al-Zn-Mg-Cu aluminum alloy can typically be heat-treated strong as one kind
Change aluminium alloy, is the ideal material of creep age forming.
Traditional creep age forming includes three phases by temperature change: temperature rise period, heat preservation (isothermal) stage, cooling rank
Section.Wherein, for holding stage, different heat treating regimes is developed, such as single-stage aging, two-stage time effect and three-step aging.Mesh
Preceding mainly to take single-stage aging system in the actual production process, aging time is taken as peak aging time, and the strength of materials is higher,
And corrosive nature is poor, extending aging time then enters overaging, and corrosive nature is improved, and intensity is but sacrificed, and is made simultaneously
Forming period is elongated.(Journal of Alloys and Compounds, 2018,743:448-455) will be double in this regard, Lin etc.
Grade institution of prescription be applied to Al-Zn-Mg-Cu aluminum alloy creep ageing, wherein level-one aging technique be 120 DEG C × 6h, two
Grade aging technique is 120 DEG C~160 DEG C × 18h；(the Materials such as Arabi Jeshvaghania
Characterization, 2012,73 (11): 8-15) by three-step aging system be applied to Al-Zn-Mg-Cu aluminum alloy creep
Age forming, aging technique be 150 DEG C ×+190 DEG C for 24 hours × 20~90min+120 DEG C × for 24 hours.By multistage aging system,
Mechanical property and corrosive nature of the material after creep ageing obtain part or comprehensive raising, but also substantially increase total compacted
Become aging time, keeps the production cycle elongated, increase production cost, cause more energy consumptions.Meanwhile traditional creep ageing
Heating and temperature-fall period in forming is shorter, it is desirable that faster heating and cooling rate, it is more demanding to temperature control device；To large size
It is difficult to realize even variation in the temperature short time for wallboard members, be easy to cause tissue, deformation uneven, it is compacted to accurately controlling
Become age forming and brings difficulty.
During traditional creep age forming, although heating and temperature-fall period are completed in a short time, the temperature rise period
Deformation, Microstructure evolution and mechanical property variation are obvious.Lei etc. (Journal of Alloys and Compounds,
2017,731:90-99) and Fu etc. (Journal of Materials Processing Technology, 2018,255:
354-363) influence of 7050 and 5A90 aluminium alloy creep ageing process Re-power loading sequence is studied respectively, is found
Formerly after load under Elevated Temperature Conditions, the deformation of creep of heating period contributes to the 44.4% and 49.2% of total creep deformation respectively.
Xu etc. (Materials Science&Engineering A, 2017,688:488-497) research has found different heating rates
The deformation of 2524 aluminium alloy creep ageings, tissue and performance are all had and significantly affected.(the Materials Science& such as Peng
Engineering A, 2017,688:146-154) processing of non-isothermal artificial aging is had studied to Al-Zn-Mg-Cu aluminum alloy
The influence of tissue and performance, is warming up to 210 DEG C from 100 DEG C by 40 DEG C/h, is cooled to 100 DEG C by 20 DEG C/h afterwards, total time is about
8.25h.As a result, it has been found that non-isothermal processing can obtain the good combination of material mechanical performance and corrosive nature, at the same than it is traditional when
Effect will greatly shorten the time.The studies above is to develop non-isothermal creep age forming technology to reduce curring time, reduce
Production cost provides thinking.
It selects the institution of prescription properly optimized to become second nature creep age forming to play a crucial role.For Al-Zn-
Mg-Cu line aluminium alloy plate to obtain the good result for taking into account mechanical property and corrosion resistance, while shortening week as far as possible
Phase reduces cost, the deficiency for avoiding traditional creep age forming institution of prescription from facing, and there is an urgent need to develop a kind of efficient, sections
The Al-Zn-Mg-Cu aluminum alloy plate creep age forming method of energy.
Summary of the invention
In order to solve the above-mentioned technical problem, the present invention uses non-isothermal aging system during plate creep age forming
Degree, provide it is a kind of can substantially shorten forming period, improve production efficiency, reduce energy consumption, reduce manufacturing cost, and obtain
Obtain the Al-Zn-Mg-Cu aluminum alloy plate creep age forming method of the high comprehensive performances such as mechanics, corrosion resisting property.
The present invention uses non-isothermal creep ageing system in Al-Zn-Mg-Cu aluminum alloy plate materials creep age forming, rises
Forming core and the growth in the area GP and η ' phase occur for the initial stage of thermophase, and material mechanical performance is improved.The later period GP of temperature rise period
Area is changed into η ' phase, and η ' phase transition is η phase and is roughened, and significantly improves the corrosion resistance of material.Compacted close to highest
Become aging temp (higher than the holding temperature of traditional creep ageing) when, part come into being precipitated phase dissolve, undissolved part after
Continuous roughening, causes mechanical property and corrosion resistance to be declined.In cooling stage, the precipitated phase that a part had previously dissolved is secondary
It is precipitated, forms tiny precipitated phase, mechanical property is made to be restored.Finally, roughening primary phase and fine second precipitated phase are obtained
Line and staff control.Wherein, the matrix precipitate average-size that non-isothermal creep ageing obtains is lower than the analysis under traditional creep ageing
Phase size out, but number density increased；And Grain Boundary Precipitates average-size and pollution freemetallurgy (PFZ) width and traditional creep
It is close when timeliness, therefore non-isothermal creep age forming can obtain excellent mechanical property, while keep preferable anti-corrosion
Performance.
A kind of efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal of the present invention, including it is following
Step: the first step, by plate solution treatment, and water quenching immediately, and placing at room temperature is more than for 24 hours；Second step, by plate at
(load) is fixed on shape mold, is warming up to highest creep ageing temperature from room temperature by certain rate of heat addition, then by with add
The identical cooling rate of hot rate is cooled to room temperature, finally unloads.
Preferably, the solid solubility temperature is 470 DEG C~480 DEG C, and the time is 1h~3h.
Preferably, the quenching mode after the solution treatment is water quenching, and transfer time is less than 10s.
Preferably, standing time is greater than for 24 hours after the water quenching.
Preferably, fixed form of the plate on shaping dies is the mechanical grip using upper and lower mould, or using true
The autoclave of empty bag and cavity plate.
Preferably, the initial temperature is room temperature (25 DEG C), and maximum temperature is 180~200 DEG C.
Preferably, the rate of heat addition is identical with cooling rate, is 30~60 DEG C/h.
Preferably, the total creep age forming time is 5.17h~11.67h.
Compared with prior art, advantageous effects of the invention:
Compared to traditional creep age forming, the method only has temperature rise period and temperature-fall period, the heat preservation of no long period
(isothermal) stage is warming up to highest creep ageing temperature by certain rate of heat addition that is, after load and (is higher than traditional creep ageing
Holding temperature in forming), room temperature is then cooled to cooling rate identical with the rate of heat addition, is finally unloaded, obtain compared with
High deformation not while loss material intensity, maintains good anti-stress corrosion performance, greatly improves production effect
Rate；So that the plate of creep age forming is highly shortened the production cycle while obtaining good comprehensive performance simultaneously, improves
Production efficiency has saved manufacturing cost, reduces energy consumption.
Detailed description of the invention
The invention will be further described for explanation with reference to the accompanying drawing.
Fig. 1 is the schematic diagram of traditional isothermal creep age forming process；
Fig. 2 is the schematic diagram of non-isothermal creep age forming process；
Fig. 3 is the precipitation phase morphology TEM bright field image photo of alloy after traditional isothermal creep age forming；
Fig. 4 is the precipitation phase morphology TEM bright field image photo of alloy after non-isothermal creep age forming.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below, so that advantages and features of the invention can be easier quilt
It will be appreciated by those skilled in the art that make apparent specific boundary's point to protection scope of the present invention.
3mm thickness rolled Al-5.9Zn-1.9Mg-2.5Cu-0.1Zr (mass percent) is used in various embodiments of the present invention
Sheet alloy.Solution heat treatment is carried out using chamber type electric resistance furnace, then carries out creep age forming in electric drying oven with forced convection.At
Shape bending radius is 1500mm.
The embodiment of the present invention includes:
Embodiment 1
Using traditional creep age forming of peak value institution of prescription.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, isothermal creep age forming temperature
Degree is 120 DEG C, and heating and temperature-fall period time are 0.5h, and the holding stage time is total processing time 25h for 24 hours.Fig. 1 is
The schematic diagram of traditional isothermal creep age forming process.
Embodiment 2
Using traditional creep age forming of overaging system.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, isothermal creep age forming temperature
Degree is 165 DEG C, and heating and temperature-fall period time are 0.5h, and the holding stage time is 18h, total processing time 19h.Fig. 3 is
After the technique creep age forming, the precipitation phase morphology TEM bright field image of material.
Embodiment 3
30 DEG C/h of heating-cooling rate, 200 DEG C of maximum temperature of non-isothermal creep age forming.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, non-isothermal creep age forming
Heating is identical with cooling rate, is 30 DEG C/h, and maximum temperature is 200 DEG C, no soaking time, total time 11.67h.Fig. 2 is
The schematic diagram of non-isothermal creep age forming process
Embodiment 4
45 DEG C/h of heating-cooling rate, 200 DEG C of maximum temperature of non-isothermal creep age forming.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, non-isothermal creep age forming
Heating is identical with cooling rate, is 45 DEG C/h, and maximum temperature is 200 DEG C, no soaking time, total time 7.78h.
Embodiment 5
45 DEG C/h of heating-cooling rate, 190 DEG C of maximum temperature of non-isothermal creep age forming.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, non-isothermal creep age forming
Heating is identical with cooling rate, is 45 DEG C/h, and maximum temperature is 190 DEG C, no soaking time, total time 7.33h.Fig. 4 is
After the technique creep age forming, the precipitation phase morphology TEM bright field image of material.
Embodiment 6
45 DEG C/h of heating-cooling rate, 180 DEG C of maximum temperature of non-isothermal creep age forming.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, non-isothermal creep age forming
Heating is identical with cooling rate, is 45 DEG C/h, and maximum temperature is 180 DEG C, no soaking time, total time 6.89h.
Embodiment 7
60 DEG C/h of heating-cooling rate, 180 DEG C of maximum temperature of non-isothermal creep age forming.
Quick water quenching after 470 DEG C of solid solution 1h of sheet coupon, quenching shift time are less than 10s, non-isothermal creep age forming
Heating is identical with cooling rate, is 60 DEG C/h, and maximum temperature is 180 DEG C, no soaking time, total time 5.17h.
Each embodiment is strong to the Vickers hardness of material, surrender after different creep age formings in embodiment 1-7
Degree, tensile strength, elongation percentage, conductivity (for measuring anti-stress corrosion performance) and creep ageing formation are surveyed total time
Examination, result such as table 1:
Table 1
From table 1 it follows that embodiment 3-7 uses non-isothermal creep age forming method as shown in Figure 2, it is each to implement
Example maintains the excellent mechanical property of material and corrosion resistance on the basis of reducing creep ageing and forming total time.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (10)
1. a kind of efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal, it is characterised in that: in Al-
It is specific using the non-isothermal aging mode of no holding stage during Zn-Mg-Cu line aluminium alloy plate creep age forming
Steps are as follows:
First by after plate solution treatment, water quenching immediately after placing at room temperature, plate is fixed on shaping dies, is added
It carries, then is gradually increased to creep ageing maximum temperature from room temperature by certain rate of heat addition, be immediately cooled to room by phase same rate
Temperature finally unloads.
2. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: the solid solubility temperature is 470 DEG C~480 DEG C, and the time is 1h~3h.
3. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: it is water quenching that mode is quenched after the solution treatment, and quenching shift time should be less than 10s.
4. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: room temperature standing time is greater than for 24 hours after the water quenching.
5. a kind of efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
It is characterized by: fixed form of the plate on shaping dies is the mechanical grip using upper and lower mould, or use vacuum bag
With the autoclave of cavity plate.
6. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: the rate of heat addition of the temperature rise period is 30~60 DEG C/h, and creep ageing maximum temperature is 180~200 DEG C.
7. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: the cooling rate of the temperature-fall period is 30~60 DEG C/h.
8. according to claim 1, the efficient creep age forming side of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal described in 6 or 7
Method, it is characterised in that: heating is identical with cooling rate.
9. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
Be characterized in that: the total creep age forming time is 5.17h~11.67h.
10. the efficient creep age forming method of Al-Zn-Mg-Cu aluminum alloy plate non-isothermal according to claim 1,
It is characterized by: creep age forming process does not include holding stage.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252883A (en) * | 2019-07-03 | 2019-09-20 | 中南大学 | A kind of efficient aluminium alloy plate manufacturing process |
| CN111485187A (en) * | 2020-04-01 | 2020-08-04 | 扬州宏福铝业有限公司 | Non-isothermal overaging treatment method for large-diameter AlZnMgCu alloy extrusion rod |
| CN113430433A (en) * | 2021-08-25 | 2021-09-24 | 中国航发北京航空材料研究院 | Aging treatment method of aluminum alloy component |
| 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 |
| CN114346611A (en) * | 2022-01-06 | 2022-04-15 | 中南大学 | Manufacturing method of multidirectional rib-containing aluminum alloy plate |
| CN115433889A (en) * | 2022-09-21 | 2022-12-06 | 沈阳工业大学 | Intermittent non-isothermal aging treatment process for aluminum alloy |
| CN115572923A (en) * | 2022-09-09 | 2023-01-06 | 北京航空航天大学 | Method for obtaining non-isothermal aging system of aluminum alloy based on in-situ resistance measurement |
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| CN104694865A (en) * | 2015-03-03 | 2015-06-10 | 西北工业大学 | Electric pulse regression treatment method for aluminum alloy |
Non-Patent Citations (1)
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| C. LEI ET AL: ""Non-isothermal creep aging behaviors of an Al-Zn-Mg-Cu alloy"", 《MATERIALS CHARACTERIZATION》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252883A (en) * | 2019-07-03 | 2019-09-20 | 中南大学 | A kind of efficient aluminium alloy plate manufacturing process |
| CN111485187A (en) * | 2020-04-01 | 2020-08-04 | 扬州宏福铝业有限公司 | Non-isothermal overaging treatment method for large-diameter AlZnMgCu alloy extrusion rod |
| CN113430433A (en) * | 2021-08-25 | 2021-09-24 | 中国航发北京航空材料研究院 | Aging treatment method of aluminum alloy component |
| 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 |
| CN114346611A (en) * | 2022-01-06 | 2022-04-15 | 中南大学 | Manufacturing method of multidirectional rib-containing aluminum alloy plate |
| CN114346611B (en) * | 2022-01-06 | 2023-09-19 | 中南大学 | Manufacturing method of multidirectional reinforced aluminum alloy plate |
| CN115572923A (en) * | 2022-09-09 | 2023-01-06 | 北京航空航天大学 | Method for obtaining non-isothermal aging system of aluminum alloy based on in-situ resistance measurement |
| CN115433889A (en) * | 2022-09-21 | 2022-12-06 | 沈阳工业大学 | Intermittent non-isothermal aging treatment process for aluminum alloy |
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