CN102978544A - Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate - Google Patents

Method for multilevel creep age forming of Al-Zn-Mg-Cu series aluminium alloy plate Download PDF

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CN102978544A
CN102978544A CN201210474194XA CN201210474194A CN102978544A CN 102978544 A CN102978544 A CN 102978544A CN 201210474194X A CN201210474194X A CN 201210474194XA CN 201210474194 A CN201210474194 A CN 201210474194A CN 102978544 A CN102978544 A CN 102978544A
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sheet
alloy
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CN102978544B (en
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邓运来
张新明
杨金龙
叶凌英
王宇
尹喜生
胡珊珊
刘胜胆
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Central South University
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Abstract

The invention relates to a method for multilevel creep age forming of an Al-Zn-Mg-Cu series aluminium alloy plate. The method is characterized in that a reasonable solid solution-quenching-pretreating-multilevel creep aging system is adopted, is suitable for plates with the thickness of 2 millimeters-30millimeters and comprises the following steps that solid solution is carried out at 470-485 DEG C for 30 minutes-120 minutes, quenching is then carried out, the quenched plate is subjected to 0-10% predeformation treatment and creep aging at 120 DEG C and is thermally insulated for 24 hours, the creep return temperature is between 150 and 170 DEG C, return thermal insulation is carried out for 20-240 minutes, and another creep aging is thermally insulated at 120 DEG C for 24 hours, wherein the creep stress is between 100 and 150 mega pascals, and the forming bending radius is between 800 millimeters and 5000 millimeters. The method is utilized to treat Al-Zn-Mg-Cu series aluminium alloy, so that the alloy creep aging strengthening phase can be effectively regulated, the mechanical property of the alloy plate and the alloy creep formability are improved, the residual stress of the alloy plate is reduced, and the alloy exfoliation corrosion resistance is improved.

Description

The multistage creep age forming method of a kind of Al-Zn-Mg-Cu line aluminium alloy sheet material
Technical field
The present invention relates to the multistage creep age forming method of a kind of Al-Zn-Mg-Cu line aluminium alloy sheet material, belong to nonferrous materials processing engineering technology field.
Background technology
But Al-Zn-Mg-Cu is metal timeliness reinforced aluminium alloy, has the plurality of advantages such as low density, high strength, fatigue crack extendability be strong, is widely used as aerospace wallboard, covering class A of geometric unitA material.In order to satisfy shaping Al-Zn-Mg-Cu line aluminium alloy integral panel, the creep age forming technology has been proposed in recent years.But creep age forming method is applicable to the integral body of ageing strengthening type alloy with the shaping of the integral panel member of muscle and Varying-thickness complex configuration and structure, has the advantages such as shaping stress is low, unrelieved stress is few, dimensional precision is high, and the manufacturing cycle is short.Studies show that Al-Zn-Mg-Cu is that the main strengthening phase of alloy is η ' phase, adopts conventional ageing treatment, such as the T6 institution of prescription, can obtain higher intensity, but alloy chipping resistance corrodibility is lower.Some two-stage time effect systems can obtain good toughness and solidity to corrosion such as systems such as T74, T76.But in forming process, exist unrelieved stress higher, the shortcomings such as production cycle length.The employing regression and re-ageing is processed, and can obtain intracrystalline diffusion-precipitation precipitated phase, and the discontinuous tissue of Grain Boundary Precipitates has obtained application in actual production.But in the following process process, exist forming residual stress higher, the shaping hard problem.Therefore be badly in need of the multistage creep age forming method of a kind of Al-Zn-Mg-Cu of being applicable to line aluminium alloy sheet material, in the hope of obtaining good shape/property cooperative development.
Summary of the invention
The object of the present invention is to provide a kind of novel Al-Zn-Mg-Cu is the multistage creep age forming method of sheet alloy, the purpose of the method is: be that the main strengthening phase η ' of alloy separates out size, density in the creep ageing process by regulation and control Al-Zn-Mg-Cu, alloy Grain Boundary Precipitates size, improving Al-Zn-Mg-Cu is mechanical property, the solidity to corrosion of alloy.
Purpose of the present invention realizes by the following method.
The multistage creep age forming method of a kind of Al-Zn-Mg-Cu line aluminium alloy sheet material is sheet alloy when heat-treating to Al-Zn-Mg-Cu, may further comprise the steps, at first sheet material is carried out solid solution, then quench, sheet material being placed bending radius is the shaping dies of 800mm ~ 5000mm and fixing again, then sheet material is carried out the creep ageing first time, subsequently insulation, then carry out creep and return, the creep ageing second time is carried out in insulation more subsequently, insulation unloads sheet material at last from mould subsequently.
Described method, described solid solubility temperature are 470-485 ℃, and the time is 30min ~ 120min.
Described method, described first time, the temperature of creep ageing was 120 ℃, soaking time is 24 hours subsequently.
Described method, the temperature that described creep returns is 150-170 ℃, soaking time is 20-240 minute.
Described method, described second time, the temperature of creep ageing was 120 ℃, soaking time is 24 hours subsequently.
Described method, the stress that applies during creep are 100-150Mpa.
Described method after sheet material is quenched, is carried out pre-treatment to sheet material again, then sheet material is fixed in and carries out the creep ageing first time in the shaping dies.
Described method, described pre-treatment is for carrying out that preliminary draft is processed or aluminum alloy plate materials is carried out precompression at vertical thickness direction process at the sheet material bearing of trend of level sheet material, and sheet material preliminary draft processing or the deflection processed of the precompression of in the vertical direction in the horizontal direction is respectively the 1-8% of horizontal total length or the vertical 1-8% of total thickness.
Described method, described sheet material forming bending radius is 800mm-5000mm.
Described method, sheet metal thickness are 2mm ~ 30mm.
The present invention has following consideration in thermal treatment: by after alloy solid solution-quenching and the pre-treatment before the creep ageing, obtain a large amount of dislocation and dislocation configuration in alloy, so that main strengthening phase diffusion-precipitation.In the regression treatment, owing to add the existence of creep stress, alloy is in a kind of higher-energy state, and the precipitated phase dissolving causes alloy main strengthening phase disperse educt more in ag(e)ing process more rapidly, and Grain Boundary Precipitates is discontinuous.Effectively raise mechanical property and the solidity to corrosion of sheet alloy.
After the invention has the advantages that Al-Zn-Mg-Cu is sheet alloy solid solution-quenching, it is carried out a small amount of predeformation, the regulation and control precipitated phase is separated out behavior, puies forward heavy alloyed mechanical property and solidity to corrosion.The method method is easy and simple to handle, and effect is remarkable, compares through ageing treatment post-treatment sheet material, is conducive to be shaped/become second nature and carry out simultaneously, saves cost, has reduced the production cycle.Has actual application value in the industrial production.
Indication aluminium alloy of the present invention can adopt diverse ways prepare material requested and (or) parts.Creep ageing adopts Chinese patent 201110209737.0: a kind of metal creep forming die, test at this mould.Tensile tests at room is made the standard tensile sample according to GB GB/T228-2002, and stretching experiment carries out at CSS-44100 universal material mechanical stretch machine, and draw speed is 2mm/min.The solidity to corrosion experiment is produced sample according to the Peeling Corrosion test method of GBT22639-2008 aluminium alloy converted products and is tested.The borehole strain method for releasing is adopted in unrelieved stress test of the present invention, according to the unrelieved stress of CB3395-1992 sheet material measurement.
The invention will be further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is that the present invention processes the sample schema;
Fig. 2 is alloy TEM bright field image photo after different treatment, (a), (b) for to process intracrystalline and Grain Boundary Precipitates without the present invention; (c), (d) is for processing intracrystalline and Grain Boundary Precipitates through the present invention;
Fig. 3 is through different treatment alloy different orientation SEM fracture apperance, (a) without the present invention process along roll to (b) without the present invention process perpendicular to roll to; (c) through the present invention process along roll to; (d) through the present invention process perpendicular to roll to;
Fig. 4 is through different treatment alloy different orientation Peeling Corrosion pattern, (a), (c) (e) process without the present invention; (b), (d), (f) process through the present invention;
Fig. 5 is the processing synoptic diagram of fixed plate of the present invention and unloading sheet material.
Embodiment
Be intended to further specify the present invention below in conjunction with embodiment, and unrestricted the present invention.
Tensile test at room temperature adopts GB/T228-2002 among each embodiment, rolls along sheet material respectively and carries out requirement of the present invention to, cross sectional sample thief and process, and carries out subsequently Mechanics Performance Testing.The solidity to corrosion experiment is produced sample according to the Peeling Corrosion test method of GBT22639-2008 aluminium alloy converted products and is tested.
The various embodiments of the present invention alloy is the Al-6.2Zn-2.4Mg-2.3Cu-0.1Zr alloy.
Embodiment 1
Shrend behind 475 ℃ of air furnace solid solution 60min of A 2mm heavy-gauge sheeting employing, creep preageing temperature is chosen 120 ℃, and creep time is 24h, returns 150 ℃ of temperature, regression time 180min, again 120 ℃/24h of timeliness.Creep stress is 100MPa.Shaping prebuckling radius is 1500mm.
Embodiment 2
Shrend behind 475 ℃ of air furnace solid solution 60min of B 10mm heavy-gauge sheeting employing, sheet material carries out 2% preliminary draft processing after quenching, and creep preageing temperature is chosen 120 ℃, and creep time is 24h, returns 150 ℃ of temperature, regression time 240min, again 120 ℃/24h of timeliness.Creep stress is 150MPa.Shaping prebuckling radius is 1000mm.
Embodiment 3
Shrend behind 475 ℃ of air furnace solid solution 60min of C20mm slab employing, sheet material carries out 4% precompression processing after quenching, and creep preageing temperature is chosen 120 ℃, and creep time is 24h, returns 150 ℃ of temperature, regression time 180min, again 120 ℃/24h of timeliness.Creep stress is 120MPa.Shaping prebuckling radius is 1300mm.
The comparative example 4
Shrend behind 475 ℃ of air furnace solid solution 60min of D 2mm slab employing, conventional preageing temperature is chosen 120 ℃/24h, returns 150 ℃/180min, again 120 ℃/24h of timeliness.
The comparative example 5
Shrend behind 475 ℃ of air furnace solid solution 60min of E 10mm slab employing, sheet material carries out 2% preliminary draft processing after quenching, and conventional preageing is chosen 120 ℃/24h, returns 150 ℃/240min, again 120 ℃/24h of timeliness.
The comparative example 6
Shrend behind 475 ℃ of air furnace solid solution 60min of F 20mm slab employing, sheet material carries out 4% precompression processing after quenching, and conventional preageing is chosen 120 ℃ of 24h, returns 150 ℃/240min, again 120 ℃/24h of timeliness.
The comparative example 7
Shrend behind 475 ℃ of air furnace solid solution 60min of G 4mm slab employing, timeliness is chosen 120 ℃ of 24h.
Table one uses tensile strength, yield strength, unit elongation, Peeling Corrosion grade, actual shaping bending radius and the unrelieved stress of embodiment of the invention interalloy

Claims (10)

1. multistage creep age forming method of Al-Zn-Mg-Cu line aluminium alloy sheet material, it is characterized in that, be that sheet alloy is when heat-treating to Al-Zn-Mg-Cu, may further comprise the steps, at first sheet material is carried out solid solution, then quench, sheet material being placed bending radius is the shaping dies of 800mm ~ 5000mm and fixing again, then sheet material is carried out the creep ageing first time, then subsequently insulation is carried out creep and is returned, subsequently insulation, carry out the creep ageing second time, insulation unloads sheet material at last from mould subsequently again.
2. method according to claim 1 is characterized in that, described solid solubility temperature is 470-485 ℃, and the time is 30min ~ 120min.
3. method according to claim 1 is characterized in that, described first time, the temperature of creep ageing was 120 ℃, and soaking time is 24 hours subsequently.
4. method according to claim 1 is characterized in that, the temperature that described creep returns is 150-170 ℃, and soaking time is 20-240 minute.
5. method according to claim 1 is characterized in that, described second time, the temperature of creep ageing was 120 ℃, and soaking time is 24 hours subsequently.
6. method according to claim 1 is characterized in that, the stress that applies during creep is 100-150Mpa.
7. method according to claim 1 is characterized in that, after sheet material is quenched, again sheet material is carried out pre-treatment, then sheet material is fixed in and carries out the creep ageing first time in the shaping dies.
8. method according to claim 7, it is characterized in that, described pre-treatment is for carrying out that preliminary draft is processed or aluminum alloy plate materials is carried out precompression at vertical thickness direction process at the sheet material bearing of trend of level sheet material, and sheet material preliminary draft processing or the deflection processed of the precompression of in the vertical direction in the horizontal direction is respectively the 1-8% of horizontal total length or the vertical 1-8% of total thickness.
9. method according to claim 1 is characterized in that, the shaping bending radius of described sheet material is 800mm-5000mm.
10. method according to claim 1 is characterized in that, sheet metal thickness is 2mm ~ 30mm.
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Cited By (9)

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CN103725943A (en) * 2014-01-16 2014-04-16 张霞 Magnesium alloy sheet and preparation method thereof
CN103725941A (en) * 2014-01-16 2014-04-16 张霞 Magnesium zinc copper alloy sheet subjected to surface treatment and manufacturing method thereof
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
CN107109606A (en) * 2014-12-09 2017-08-29 诺维尔里斯公司 The ageing time of 7xxx series alloys is reduced
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
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
CN110951981A (en) * 2019-12-23 2020-04-03 江西理工大学 Method for improving corrosion resistance of 7-series aluminum alloy
CN112267082A (en) * 2020-09-10 2021-01-26 西北工业大学 Alloy plate pulse current regression creep age forming method
CN113293341A (en) * 2021-05-28 2021-08-24 湖南大学 Short-process regression and reaging optimization process for Al-Zn-Mg-Cu aluminum alloy

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CN103725941A (en) * 2014-01-16 2014-04-16 张霞 Magnesium zinc copper alloy sheet subjected to surface treatment and manufacturing method thereof
CN103725943A (en) * 2014-01-16 2014-04-16 张霞 Magnesium alloy sheet and preparation method thereof
CN103725943B (en) * 2014-01-16 2015-11-18 张霞 A kind of magnesium alloy sheet and preparation method thereof
CN103725941B (en) * 2014-01-16 2016-01-20 南通波斯佳织造科技有限公司 A kind of surface treated magnesium platina thin plate and preparation method thereof
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
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
CN107109606A (en) * 2014-12-09 2017-08-29 诺维尔里斯公司 The ageing time of 7xxx series alloys is reduced
US10648066B2 (en) 2014-12-09 2020-05-12 Novelis Inc. Reduced aging time of 7xxx series alloy
CN107109606B (en) * 2014-12-09 2019-09-27 诺维尔里斯公司 The aging time of 7xxx series alloy is reduced
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
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
CN109487185B (en) * 2018-12-28 2021-07-20 中南大学 Progressive creep age forming process of complex aluminum alloy component
CN110951981B (en) * 2019-12-23 2020-11-17 江西理工大学 Method for improving corrosion resistance of 7-series aluminum alloy
CN110951981A (en) * 2019-12-23 2020-04-03 江西理工大学 Method for improving corrosion resistance of 7-series aluminum alloy
CN112267082A (en) * 2020-09-10 2021-01-26 西北工业大学 Alloy plate pulse current regression creep age forming method
CN113293341A (en) * 2021-05-28 2021-08-24 湖南大学 Short-process regression and reaging optimization process for Al-Zn-Mg-Cu aluminum alloy

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