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EP2379765B2 - Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung - Google Patents

Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung Download PDF

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Publication number
EP2379765B2
EP2379765B2 EP10700994.6A EP10700994A EP2379765B2 EP 2379765 B2 EP2379765 B2 EP 2379765B2 EP 10700994 A EP10700994 A EP 10700994A EP 2379765 B2 EP2379765 B2 EP 2379765B2
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EP
European Patent Office
Prior art keywords
plate
cold rolling
residual stress
aluminium alloy
thickness
Prior art date
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Active
Application number
EP10700994.6A
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English (en)
French (fr)
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EP2379765B8 (de
EP2379765A1 (de
EP2379765B1 (de
Inventor
Ingo Günther KRÖPFL
Alfred Johann Peter Haszler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novelis Koblenz GmbH
Original Assignee
Aleris Rolled Products Germany GmbH
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Publication date
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Application filed by Aleris Rolled Products Germany GmbH filed Critical Aleris Rolled Products Germany GmbH
Priority to EP10700994.6A priority Critical patent/EP2379765B2/de
Publication of EP2379765A1 publication Critical patent/EP2379765A1/de
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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the invention relates to a method of manufacturing a wrought aluminium alloy thick gauge plate product having a reduced level of residual stress.
  • Age-hardenable wrought aluminium alloys are used amongst others for aerospace applications because of their combination of strength, corrosion resistance, and damage tolerance properties. Plates from these products are commonly produced by a process involving casting, forming by means of rolling and/or forging, solution heat treating, quenching of the solution heat treated product, and ageing of the quenched product. The quenching process also leaves high residual stress, which cannot be thermally relieved while maintaining the alloy product's favourable mechanical properties. Therefore, the stresses are relieved or at least reduced by applying a uniform plastic strain, which for rolled plate involves uniaxially stretching in the rolling direction, and when applied on an industrial scale typically from about 1.5% to 3% strain, and followed by ageing which consequently carries the Tx51 temper designation.
  • the rolled plate is compressed in a forging operation commonly by overlapping steps followed by ageing and consequently carries the Tx52 temper designation.
  • a forging operation by compressing of thick plates or blocks is for example disclosed in patent document WO-2004/053180-A2 .
  • US Patent Numbers 6,159,315 and 6,406,567 disclose methods of stress relieving solution heat-treated and quenched aluminium alloy plates that includes a combination of a stress-relieving cold mechanical stretch and a stress-relieving cold-compression, the cold stretch being performed in the length direction, and the cold compression being performed in the thickness direction.
  • US Patent No. 6,569,542 discloses a structural element made from a 2xxx-series alloy having a thickness of at least 10 mm and treated by solution heat treating, quenching, permanent tension to more than 1.5% permanent deformation by means of stretching, and ageing.
  • US Patent No. 6,077,363 discloses an AlCuMg sheet product, said sheet having reduced deflection after machining, and whereby the sheet product has been quenched and stretched.
  • WO 2008/003503 A discloses an AA2000-series alloy comprising 2 to 5.5% Cu, 0.5 to 2% Mg, at most 1% Mn, Fe ⁇ 0.25%, Si > 0.10 to 0.35%, and a method of manufacturing these aluminium alloy products. More particularly, this document relates to aluminium wrought products in relatively thick gauges, i.e. about 30 to 300 mm thick. The solution heat-treated and quenched plate products are stress-relieved by cold rolling to achieve a thickness reduction of 8% to 13%.
  • Representative structural component parts made from the alloy product include integral spar members and the like which are machined from thick wrought sections, including rolled plate.
  • Aluminium sheet products or thin gauge plate products may be stretched or levelled by rolls to improve metal flatness and it might result also in a small reduction of residual stress.
  • Levelling by rolls consists of passing the sheet product between two or more series of parallel rolls placed alternately below and above the sheet, the rolls being nested. The sheet product is then alternately deflected in one direction and then in the other direction to obtain plastic deformation.
  • thicker gauge products more than about 20 mm in thickness
  • the deformation by means of roll levelling is not sufficiently controllable to achieve reproducible characteristics in relaxation of residual stress after quenching, which is easier with a stretcher than with a roll levelling machine, at least in the case of thicker gauge sheet products.
  • the stretching machine comprises a fixed head with jaws and a mobile head comprising the other jaws. If the cross-section of the plate product is large (e.g. very thick or very wide or both) the strength of the stretching machine, and in particular the clamping force of the jaws, may be insufficient to achieve the desired stretching degree.
  • the aluminium alloy plate product of more than 80 mm thick has been produced by casting, rolling (either symmetric, asymmetric, or a combination thereof) and/or forging, solution heat treating, quenching, and ageing, and wherein after quenching the plate product has been cold rolled according to this invention to reduce the level of residual stress in the product.
  • the present invention provides a method for the manufacture of an aluminium alloy plate having reduced level of residual stress according to claim 1. It has been found that the through-thickness residual stress profiles were significantly reduced as a result of the through thickness deformation from the cold rolling operation. The reduction in the levels of residual stress were in the same range as would have been achieved in a stretching operation.
  • the method of the invention can be applied to plate products of much larger cross sections than can be handled in a regular stretching operation to achieve a similar effect.
  • the rolling operation is a continuous operation, there are no restrictions to the length of the plate product other than imposed by the dimensions of the original rolling ingot. Hence, plate products having a length of more than 40 meters can be stress relieved by the method according to this invention.
  • the cold rolling to reduce residual stress is carried out following solution heat treatment and quenching and prior to any further artificial ageing operation.
  • Cold rolling after quenching and before ageing is favoured as the required rolling forces can be kept at the lowest practical level.
  • the method for the manufacture of a plate product includes solution heat treatment and quenching, followed by one of more artificial ageing practices and followed by cooling, and where after the aged and quenched plate product is cold rolled in accordance with the invention to reduce the level of residual stress.
  • the desired properties are achieved when the cold rolling operation is carried out at a relatively low strain rate of less than 0.10 sec -1 in accordance with the invention.
  • the strain rate is less than about 0.05 sec -1 , and more preferably less than about 0.03 sec -1 .
  • a preferred lower limit would be of at least about 0.006 sec -1 , and more preferably of at least 0.010 sec -1 .
  • a regular cold rolling skin-pass of 1% at thick gauge material, for example of 300 mm, would result in a strain rate of about 0.002 to 0.003 sec -1 , but also leading to increased levels of residual stress.
  • Some aluminium alloys show surface markings resulting from localized flow and which appear after light straining, known in the art as Lüder-lines.
  • An advantage of the method according to this invention is that there is no formation of such Luderlines as the alloy plate products are subjected to a rolling operation.
  • the cold rolling operation in accordance with this invention to reduce the level of residual stress in the plate product after quenching is to be carried out at a temperature that strain hardening occurs.
  • the temperature of the plate product is preferably less than about 200°C, preferably less than about 90°C, and more preferably less than about 60°C such that is ideally carried out in a regular industrial environment at ambient temperature.
  • Cryogenic treatment to stress relieve a product is a different process aimed at different products and is commonly carried out after all major machining has been completed. Cryogenic treatment is considered not to be within the scope of the present invention.
  • the cold rolling operation in accordance with the invention to reduce the level of residual stress is advantageously carried out in a rolling schedule comprising one or more rolling passes having a total minimum plastic deformation in the thickness direction of at least 0.5%.
  • the cold rolling schedule is carried out such that the deformation is introduced in one single rolling operation and not in a multiple-step cold rolling operation.
  • the plate product may have a width of 1200 mm or more, and even of about 1500 mm or more.
  • regular plate dimensions can be processed with the method according to this invention.
  • the aluminium plate product has a thickness of 80 mm or more, preferably of about 125 mm or more, and preferably of about 175 mm or more.
  • plate product of thinner gauge e.g. 15 mm or 50 mm
  • the upper-limit of the plate thickness is in principle only limited by the force of the rolling mill. In practical terms this would mean an upper-limit for the thickness of about 800 mm, and more typically of about 600 mm, and more typically of about 400 mm.
  • the age-hardening aluminium alloy is selected from the group consisting of 2xxx, 6xxx, or 7xxx-series alloys.
  • Some particular examples of alloy products favourably processed with the method according to this invention have a chemical composition within the ranges of AA7010, AA7136, AA7040, AA7140, AA7049, AA7050, AA7075, AA7081, AA7181, or AA7085, plus modifications thereof.
  • the 6xxx-series alloys include amongst other AA6061, AA6082, AA6013, and 6xxx-series alloy modification comprising purposive additions of Zn and/or Li.
  • the 2xxx-series alloys include amongst other AA2014, AA2017, AA2024, AA2124, AA2219, and also 2xxx-series alloy modification thereof comprising purposive additions of Zn and/or Ag and/or Li.
  • a further aspect of the invention relates to a method of use of the plate product obtained by the method according to this invention for the manufacture of machined structural workpieces, for the manufacture of injection moulds, such as moulds for plastics or rubber, as well as for structural members for airframe structures, such as spars, floor beam members, and wing stringers.
  • All the AA6061-series aluminium alloy plates had the same dimensions and were cast using the same procedure. They were subjected to a standard transformation sequence for thick gauge products, that is reheating after homogenisation, hot rolling to a gauge of 152 mm, solution heat-treating and quenched. The as-quenched plates were then treated in several different ways to investigate the effect of further processing on the level of residual stresses in the plate material.
  • the cold rolling in accordance with the invention has been carried out on a 160 inch rolling mill. The following conditions have been tested:
  • the as-quenched plate product has a high residual stress, whereas the residual stress of the stretched product is around zero as one would expect.
  • the residual stress of the cold rolled products increases with increasing cold rolling degree. This would mean that at relatively low cold rolling degree at low strain rate there might be a residual stress profile closely corresponding to that of stretched products.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Forging (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (13)

  1. Verfahren zur Herstellung einer Aluminiumlegierungsplatte mit verminderter Restspannung, wobei das Verfahren umfasst
    a) Bereitstellen einer lösungswärmebehandelten und abgeschreckten Aluminiumlegierungsplatte mit einer Dicke von wenigstens 80 mm,
    b) Entspannen der Platte durch Kaltwalzen der Platte, um eine Verringerung in der Dickerichtung des Plattenprodukts im Bereich von 0,5% bis 3% zu erzielen,
    wobei das Kaltwalzen während Schritt b) bei einer Umformgeschwindigkeit von weniger als 0,10 sec-1 durchgeführt wird.
  2. Verfahren nach Anspruch 1, wobei die Platte aus einer Aluminiumlegierung der Reihen 2xxx, 6xxx oder 7xxx hergestellt wird.
  3. Verfahren nach Anspruch 1 oder 2, wobei die Platte eine Dicke von weniger als 800 mm, und bevorzugt von weniger als 600 mm, aufweist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei die Platte eine Dicke von wenigstens 125 mm, und bevorzugt von wenigstens 175 mm, aufweist.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Platte bei einer Temperatur von weniger als 90°C, und bevorzugt bei einer Temperatur von weniger als 60°C, kaltgewalzt worden ist.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei das Kaltwalzen während Schritt b) unter Verwendung eines Walzplans, welcher aus einem einzigen Walzgang bzw. Walzstich besteht, durchgeführt wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei das Kaltwalzen während Schritt b) bei einer Umformgeschwindigkeit von weniger als 0,05 sec-1 durchgeführt wird.
  8. Verfahren nach einem der Ansprüche 1 bis 7, wobei das Kaltwalzen während Schritt b) bei einer Umformgeschwindigkeit von wenigstens 0,006 sec-1 durchgeführt wird.
  9. Verfahren nach einem der Ansprüche 1 bis 8, wobei das Kaltwalzen während Schritt b) nach einer Lösungswärmebehandlung und Abschrecken und vor einer künstlichen Alterung durchgeführt wird.
  10. Verfahren nach einem der Ansprüche 1 bis 8, wobei das Kaltwalzen während Schritt b) nach einer Lösungswärmebehandlung, Abschrecken sowie einer künstlichen Alterung und Kühlen durchgeführt wird.
  11. Verfahren nach einem der Ansprüche 1 bis 10, wobei die Platte aus einer Aluminiumlegierung der 7xxx-Reihe hergestellt wird, welche bevorzugt ausgewählt wird aus der Gruppe AA7010, AA7136, AA7040, AA7140, AA7049, A7050, AA7075, AA7081, AA7181 und AA7085.
  12. Verfahren nach einem der Ansprüche 1 bis 10, wobei die Platte aus einer Aluminiumlegierung der 6xxx-Reihe hergestellt wird, welche bevorzugt ausgewählt wird aus der Gruppe AA6061, AA6082 und AA6013.
  13. Verfahren nach einem der Ansprüche 1 bis 10, wobei die Platte aus einer Aluminiumlegierung der 2xxx-Reihe hergestellt wird, welche bevorzugt ausgewählt wird aus der Gruppe AA2014, AA2017, AA2024, AA2124 und AA2219.
EP10700994.6A 2009-01-16 2010-01-15 Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung Active EP2379765B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10700994.6A EP2379765B2 (de) 2009-01-16 2010-01-15 Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14525809P 2009-01-16 2009-01-16
EP09150734 2009-01-16
EP10700994.6A EP2379765B2 (de) 2009-01-16 2010-01-15 Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung
PCT/EP2010/050479 WO2010081889A1 (en) 2009-01-16 2010-01-15 Method for the manufacture of an aluminium alloy plate product having low levels of residual stress

Publications (4)

Publication Number Publication Date
EP2379765A1 EP2379765A1 (de) 2011-10-26
EP2379765B1 EP2379765B1 (de) 2012-10-31
EP2379765B8 EP2379765B8 (de) 2012-12-12
EP2379765B2 true EP2379765B2 (de) 2016-10-12

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EP10700994.6A Active EP2379765B2 (de) 2009-01-16 2010-01-15 Herstellungsverfahren eines aluminiumlegierungsplattenprodukts mit geringer eigenspannung

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EP (1) EP2379765B2 (de)
CN (1) CN102282284A (de)
RU (1) RU2524291C2 (de)
WO (1) WO2010081889A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102965603A (zh) * 2012-10-31 2013-03-13 邓运来 一种用于减小变形铝合金淬火残余应力，改善合金性能的热处理方法
CN103045974B (zh) * 2013-01-09 2015-03-04 湖南大学 提高变形铝合金强度并保持其塑性的热加工方法
CN104624647B (zh) * 2014-12-31 2017-01-11 中铝西南铝冷连轧板带有限公司 手机电池外壳用铸轧1100合金铝箔生产方法
CN111534730B (zh) * 2020-05-18 2021-05-28 西南铝业（集团）有限责任公司 一种2219t8511铝合金挤压型材的制备方法
CN115228935A (zh) * 2022-07-07 2022-10-25 中南大学 一种高强铝合金带筋薄壁板冷轧工艺方法

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US6159315A (en) 1994-12-16 2000-12-12 Corus Aluminium Walzprodukte Gmbh Stress relieving of an age hardenable aluminum alloy product
US6027582A (en) * 1996-01-25 2000-02-22 Pechiney Rhenalu Thick alZnMgCu alloy products with improved properties
US6077363A (en) 1996-06-17 2000-06-20 Pechiney Rhenalu Al-Cu-Mg sheet metals with low levels of residual stress
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US20050006010A1 (en) * 2002-06-24 2005-01-13 Rinze Benedictus Method for producing a high strength Al-Zn-Mg-Cu alloy
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Also Published As

Publication number Publication date
EP2379765B8 (de) 2012-12-12
CN102282284A (zh) 2011-12-14
EP2379765A1 (de) 2011-10-26
WO2010081889A1 (en) 2010-07-22
RU2011129115A (ru) 2013-02-27
RU2524291C2 (ru) 2014-07-27
EP2379765B1 (de) 2012-10-31

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