EP3662092B1 - Aus blechprodukt aus 6xxx-serie-aluminiumlegierung-gefertigtes automobilkarosserieteil - Google Patents

Aus blechprodukt aus 6xxx-serie-aluminiumlegierung-gefertigtes automobilkarosserieteil Download PDF

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Publication number
EP3662092B1
EP3662092B1 EP18753328.6A EP18753328A EP3662092B1 EP 3662092 B1 EP3662092 B1 EP 3662092B1 EP 18753328 A EP18753328 A EP 18753328A EP 3662092 B1 EP3662092 B1 EP 3662092B1
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EP
European Patent Office
Prior art keywords
aluminium alloy
sheet product
outer panel
temperature
alloy sheet
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Application number
EP18753328.6A
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English (en)
French (fr)
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EP3662092A1 (de
Inventor
Philippe Meyer
Els Verboom
Aleksandar Lozanov DAVIDKOV
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.)
Aleris Aluminum Duffell BVBA
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Aleris Aluminum Duffell BVBA
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Classifications

    • 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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • 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
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • 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
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions

Definitions

  • the invention relates to an automotive outer panel made from a 6xxx-series aluminium alloy sheet product and to a method of manufacturing such a panel.
  • up to 0.15% Zn may include an alloy having no Zn.
  • an automotive outer panel made from a 6xxx-series aluminium alloy sheet product consisting of, in wt.%: Si 0.54% to 0.75%, Mg 0.57% to 0.65%, Cu 0.03% to 0.08%, Mn 0.06% to 0.20%, Fe 0.10% to 0.25%, wherein the ratio of Fe to Mn is in a range of 1.0 to 2.30 (Fe:Mn), and wherein the aluminium alloy sheet product has a ratio of Si to Mg of less than 1.20 (Si:Mg) and at least 0.90 (Si:Mg), Cr up to 0.09%, Zn up to 0.15%, V up to 0.04%, Ti up to 0.15%, other elements and unavoidable impurities each up to 0.05%, total up to 0.2%, balance aluminium.
  • the automotive outer panel made of the defined aluminium alloy sheet product by carefully controlling the compositional ranges of the aluminium alloy (with preferred ranges herein set forth and claimed) and its manufacturing route provides a good balance of low strength and good formability, in particular also a good hemming performance, in a T4P temper (relates to material in a T4 temper and that has undergone a pre-ageing treatment to a pre-age temperature in a range of 90 °C to 105 °C), and a high paint bake response and high strength in a T64 temper (after 2% prestrain and a simulated paint bake cycle of 185°C/20 min).
  • a T4P temper relates to material in a T4 temper and that has undergone a pre-ageing treatment to a pre-age temperature in a range of 90 °C to 105 °C
  • a high paint bake response and high strength in a T64 temper (after 2% prestrain and a simulated paint bake cycle of 185°C/20 min).
  • the aluminium sheet product has a very good resistance to corrosion.
  • it has a very good resistance to intergranular corrosion (IGC) when tested in a naturally aged condition after being subjected to a paint bake cycle, as well as after being exposed for 1,000 hours at 150°C.
  • IGC intergranular corrosion
  • the requirement of a good IGC resistance after 1,000 hours at 150°C is to reflect the extreme situation that the aluminium sheet product when applied in a vehicle body is long term exposed to elevated temperature near heat sources such as an engine, exhaust system or sun rays.
  • the Mg-content in the aluminium alloy sheet product is at most 0.65%.
  • the ratio of wt.% Si to wt.% Mg is less than 1.20 (Si:Mg), and preferably at most 1.10 (Si:Mg) to provide sufficient strength and a high formability in the T4P temper.
  • the ratio of Si to Mg is at least 0.90 (Si:Mg). In an embodiment, the ratio of Si to Mg is at least 0.95 (Si:Mg). This narrow range of Si:Mg ratio is to improve the formability in the T4P temper and to increase the strength in the T64 temper of the aluminium alloy sheet product.
  • the manganese (Mn)-content is at least 0.10%.
  • a preferred upper-limit for the Mn-content is 0.18%, and more preferably 0.15%.
  • Vanadium (V) can be present in the aluminium alloy sheet product up to about 0.04%.
  • the aluminium alloy includes not greater than 0.03% V, and more preferably not greater than 0.02% V, as it may have an adverse effect on the r-value of the aluminium sheet in the T4P temper.
  • the alloy according to the invention meets the requirements that in a T4P temper it has a tensile strength of 180 MPa or more, preferably at least 195 MPa, a yield point of 115 MPa or less when measured within 3-10 days after solution heat treatment and quench, and an elongation at break of at least 24%, an uniform elongation of at least 20%, a strain hardening exponent (n-value) of at least 0.26.
  • the yield point was less than 130 MPa after 6 months storage at room temperature.
  • the sheet product has an IGC corrosion resistance well below the required threshold of less than 200 micron.
  • the aluminium alloy sheet product has in a T64 temper a tensile strength of 260 MPa or more, a yield point of 195 MPa or more, and an elongation at break of at least 14%.
  • DC-cast ingots of an aluminium alloy according to this invention has been processed in accordance with the invention into 1.0mm sheet material except for a difference in the pre-age temperature.
  • the composition of the aluminium alloy is listed in Table 2.
  • One alloy has been pre-aged at about 100°C (4A) and one at about 70°C (4B) and immediately coiled at this temperature and cooled to room temperature in an ambient environment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (13)

  1. Außenpaneel für Kraftfahrzeuge, hergestellt aus einem Blechprodukt aus einer Aluminiumlegierung der 6xxx-Serie, erhalten durch ein Verfahren, das die folgenden Schritte umfasst:
    Gießen eines Barrens mit einer Zusammensetzung bestehend aus, in Gew.-%: Si 0,54% bis 0,75%, Mg 0,57% bis 0,65%, Cu 0,03% bis 0,08%, Mn 0,06% bis 0,20%, Fe 0,10% bis 0,25%,
    wobei das Verhältnis von Fe zu Mn in einem Bereich von 1,0 (Fe:Mn) bis 2,30 (Fe:Mn) liegt, Cr bis zu 0,09%, Zn bis zu 0,15%, V bis zu 0,04%, Ti bis zu 0,15%,
    andere Elemente und unvermeidbare Verunreinigungen jeweils bis zu 0,05 %, insgesamt bis zu 0,2 %, Rest Aluminium, und wobei das Blechprodukt aus Aluminiumlegierung ein Verhältnis von Si zu Mg von weniger als 1,20 (Si:Mg) und mindestens 0,90 (Si:Mg) aufweist;
    - Homogenisieren des Barrens;
    - Warmwalzen;
    - Kaltwalzen zu Blechen mit einer Enddicke von 0,7 mm bis 4,0 mm;
    - Lösungsglühen des kaltgewalzten Blechmaterials und anschließendes Abschrecken;
    - Erwärmen des lösungsgeglühten und abgeschreckten kaltgewalzten Blechmaterials auf eine Voralterungstemperatur im Bereich von 90 °C bis 105 °C, Aufwickeln des Blechmaterials bei einer Temperatur in dem genannten Temperaturbereich von 90 °C bis 105 °C und Abkühlen der Rolle auf Umgebungstemperatur in einer umgebenden Umgebung;
    - natürliche Alterung und Lagerung.
  2. Außenpaneel für Kraftfahrzeuge nach Anspruch 1, wobei die das Blechprodukt aus Aluminiumlegierung ein Verhältnis von Fe zu Mn von weniger als 2,0 und vorzugsweise weniger als 1.8 aufweist.
  3. Außenpaneel für Kraftfahrzeuge nach Anspruch 1 oder 2, wobei das Blechprodukt aus Aluminiumlegierung ein Verhältnis von Si zu Mg von höchstens 1,10 aufweist.
  4. Außenpaneel für Kraftfahrzeuge nach einem der Ansprüche 1 bis 3, wobei das Blechprodukt aus Aluminiumlegierung einen Mn-Gehalt von mindestens 0,10 %, und vorzugsweise von höchstens 0,18 % aufweist.
  5. Außenpaneel für Kraftfahrzeuge nach einem der Ansprüche 1 bis 4, wobei das Blechprodukt aus Aluminiumlegierung einen Si-Gehalt von mindestens 0,58 %, und vorzugsweise von mindestens 0,60 % aufweist.
  6. Außenpaneel für Kraftfahrzeuge nach einem der Ansprüche 1 bis 5, wobei das Blechprodukt aus Aluminiumlegierung einen Si-Gehalt von höchstens 0,70 % aufweist, und vorzugsweise von höchstens 0,68 %.
  7. Außenpaneel für Kraftfahrzeuge nach einem der Ansprüche 1 bis 6, wobei das Blechprodukt aus Aluminiumlegierung einen Fe-Gehalt von mindestens 0,12 %, vorzugsweise von mindestens 0,15 % aufweist
  8. Verwendung eines Blechproduktes aus Aluminiumlegierung nach einem der Ansprüche 1 bis 7 in einem Außenpaneel eines Kraftfahrzeugs, wobei das Blechprodukt aus Aluminiumlegierung vorzugsweise im T4P-Zustand geformt worden ist.
  9. Kraftfahrzeugtür mit einem Außenpaneel, das aus einem Aluminiumblechprodukt nach einem der Ansprüche 1 bis 7 hergestellt ist.
  10. Verfahren zur Herstellung eines Außenpaneels für Kraftfahrzeuge, das die folgenden Schritte umfasst:
    - Gießen eines Barrens mit einer Zusammensetzung nach einem der Ansprüche 1 bis 7;
    - Homogenisieren des Barrens;
    - Warmwalzen;
    - Kaltwalzen zu Blechen mit einer Enddicke von 0,7 mm bis 4,0 mm;
    - Lösungsglühen des kaltgewalzten Blechmaterials und anschließendes Abschrecken;
    - Erwärmen des lösungsgeglühten und abgeschreckten kaltgewalzten Blechmaterials auf eine Voralterungstemperatur im Bereich von 90 °C bis 105 °C, Aufwickeln des Blechmaterials bei einer Temperatur in dem genannten Temperaturbereich von 90 °C bis 105 °C und Abkühlen der Rolle auf Umgebungstemperatur in einer umgebenden Umgebung;
    - natürliche Alterung und Lagerung.
  11. Verfahren nach Anspruch 10, wobei ferner das Aluminiumblech in einer Umformung in ein Kraftfahrzeug-Karosserieteil oder -paneel geformt wird, vorzugsweise in ein dreidimensionales Außenpaneel für Kraftfahrzeuge.
  12. Verfahren nach einem der Ansprüche 10 oder 11, wobei das Lösungsglühen des kaltgewalzten Blechmaterials bei einer Temperatur im Bereich von 530°C bis 570°C erfolgt.
  13. Verfahren nach einem der Ansprüche 10 bis 12, wobei das Aluminium nach dem Warmwalzen auf eine mittlere Dicke kaltgewalzt, zwischengeglüht, vorzugsweise durch Chargenglühen bei einer Temperatur im Bereich von 345°C bis 410°C, und zu einem Blech mit einer Enddicke von 0,7 mm bis 4,0 mm kaltgewalzt wird.
EP18753328.6A 2017-08-02 2018-07-30 Aus blechprodukt aus 6xxx-serie-aluminiumlegierung-gefertigtes automobilkarosserieteil Active EP3662092B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17184490 2017-08-02
PCT/EP2018/070532 WO2019025335A1 (en) 2017-08-02 2018-07-30 EXTERIOR AUTOMOTIVE PANEL CONSISTING OF 6XXX SERIES ALUMINUM ALLOY SHEET PRODUCT

Publications (2)

Publication Number Publication Date
EP3662092A1 EP3662092A1 (de) 2020-06-10
EP3662092B1 true EP3662092B1 (de) 2025-07-02

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US (1) US20210025046A1 (de)
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WO (1) WO2019025335A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3798326A1 (de) * 2019-09-25 2021-03-31 Apple Inc. Kosmetische aluminiumlegierungen aus rezykliertem aluminiumschrott
CN114941091A (zh) * 2022-04-29 2022-08-26 天津忠旺铝业有限公司 一种车身外板用6000系铝合金板材及其制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050000609A1 (en) * 2002-12-23 2005-01-06 Butler John F. Crash resistant aluminum alloy sheet products and method of making same
US8846209B2 (en) 2004-11-16 2014-09-30 Aleris Aluminum Duffel Bvba Aluminium composite sheet material
WO2007129391A1 (ja) 2006-05-01 2007-11-15 Ibiden Co., Ltd. 焼成用治具組立装置、焼成用治具分解装置、循環装置、セラミック成形体の焼成方法、及び、ハニカム構造体の製造方法
EP1852251A1 (de) 2006-05-02 2007-11-07 Aleris Aluminum Duffel BVBA Verbundblech aus Aluminium
EP2156945A1 (de) 2008-08-13 2010-02-24 Novelis Inc. Plattiertes Kraftfahrzeug-Blechprodukt
EP2110235A1 (de) * 2008-10-22 2009-10-21 Aleris Aluminum Duffel BVBA Gerolltes Al-Mg-Si-Legierungsprodukt mit guter Hemmung
JP6506678B2 (ja) * 2015-11-02 2019-04-24 株式会社神戸製鋼所 自動車構造部材用アルミニウム合金板およびその製造方法

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US20210025046A1 (en) 2021-01-28
WO2019025335A1 (en) 2019-02-07

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