EP3662092B1 - Panneau extérieur d'automobile fabriqué à partir d'un produit en tôle d'alliage d'aluminium série 6xxx - Google Patents

Panneau extérieur d'automobile fabriqué à partir d'un produit en tôle d'alliage d'aluminium série 6xxx 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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German (de)
English (en)
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EP3662092A1 (fr
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. Panneau extérieur automobile fait à partir d'un produit en tôle d'alliage d'aluminium de série 6xxx, obtenu par un procédé comprenant les étapes suivantes :
    coulage d'un lingot ayant une composition comprenant, en %m : Si 0,54 % à 0,75 %, Mg 0,57 % à 0,65 %, Cu 0,03 % à 0,08 %, Mn 0,06 % à 0,20 %, Fe 0,10 % à 0,25 %,
    dans lequel le ratio de Fe sur Mn est dans une plage allant de 1,0 (Fe:Mn) à 2,30 (Fe:Mn), Cr jusqu'à 0,09 %, Zn jusqu'à 0,15 %, V jusqu'à 0,04 %, Ti jusqu'à 0,15 %,
    d'autres éléments et impuretés inévitables allant chacun jusqu'à 0,05 %, au total jusqu'à 0,2 %, le reste étant de l'aluminium, et le produit en tôle d'alliage d'aluminium ayant un ratio de Si sur Mg inférieur à 1,20 (Si:Mg) et d'au moins 0,90 (Si:Mg) ;
    - homogénéisation du lingot ;
    - laminage à chaud ;
    - laminage à froid pour obtenir une tôle ayant un calibre final de 0,7 mm à 4,0 mm ;
    - traitement thermique par solution du matériau en tôle laminé à froid, puis trempe ;
    - chauffe du matériau en tôle laminé à froid soumis au traitement thermique par solution et à la trempe à une température de pré-vieillissement dans une plage de 90 °C à 105 °C, enroulement du matériau en tôle à une température dans ladite plage de température de 90 °C à 105 °C, et refroidissement du rouleau à température ambiante dans un environnement ambiant ;
    - vieillissement naturel et stockage
  2. Panneau extérieur automobile selon la revendication 1, dans lequel le produit en tôle d'alliage d'aluminium a le ratio de Fe sur Mn inférieur à 2,0, et de préférence inférieur à 1,8.
  3. Panneau extérieur automobile selon la revendication 1 ou 2, dans lequel le produit en tôle d'alliage d'aluminium a un ratio de Si sur Mg d'au plus 1,10.
  4. Panneau extérieur automobile selon l'une quelconque des revendications 1 à 3, dans lequel le produit en tôle d'alliage d'aluminium a une teneur en Mn d'au moins 0,10 %, et de préférence d'au plus 0,18 %.
  5. Panneau extérieur automobile selon l'une quelconque des revendications 1 à 4, dans lequel le produit en tôle d'alliage d'aluminium a une teneur en Si d'au moins 0,58 %, et de préférence d'au moins 0,60 %.
  6. Panneau extérieur automobile selon l'une quelconque des revendications 1 à 5, dans lequel le produit en tôle d'alliage d'aluminium a une teneur en Si d'au plus 0,70 %, et de préférence d'au plus 0,68 %.
  7. Panneau extérieur automobile selon l'une quelconque des revendications 1 à 6, dans lequel le produit en tôle d'alliage d'aluminium a une teneur en Fe d'au moins 0,12 %, et de préférence d'au moins 0,15 %.
  8. Utilisation d'un produit en tôle d'alliage d'aluminium tel que défini dans l'une quelconque des revendications 1 à 7 dans un panneau extérieur automobile, et de préférence dans laquelle le produit en tôle d'alliage d'aluminium a été formé dans la condition T4P.
  9. Porte de véhicule motorisé comprenant un panneau extérieur automobile fait à partir d'un produit en tôle d'aluminium tel que défini dans l'une quelconque des revendications 1 à 7.
  10. Procédé de production d'un panneau extérieur automobile, comprenant les étapes suivantes :
    - coulage d'un lingot ayant une composition selon l'une quelconque des revendications 1 à 7 ;
    - homogénéisation du lingot ;
    - laminage à chaud ;
    - laminage à froid pour obtenir une tôle ayant un calibre final de 0,7 mm à 4,0 mm ;
    - traitement thermique par solution du matériau en tôle laminé à froid, puis trempe ;
    - chauffe du matériau en tôle laminé à froid soumis au traitement thermique par solution et à la trempe, à une température de pré-vieillissement dans une plage de 90 °C à 105 °C, enroulement du matériau en tôle à une température dans ladite plage de température de 90 °C à 105 °C, et refroidissement du rouleau à température ambiante dans un environnement ambiant ;
    - vieillissement naturel et stockage
  11. Procédé selon la revendication 10, dans lequel la tôle d'aluminium, dans une opération de formage, est en outre formée pour obtenir un élément ou un panneau de corps automobile, de préférence un panneau extérieur automobile tridimensionnel.
  12. Procédé selon l'une quelconque des revendications 10 ou 11, dans lequel la chauffe thermique par solution du matériau en tôle laminé à froid est à une température dans la plage de 530 °C à 570 °C.
  13. Procédé selon l'une quelconque des revendications 10 à 12, dans lequel à la suite du laminage à chaud, l'aluminium est laminé à froid à un calibre intermédiaire, recuit de manière intermédiaire, de préférence par recuit par lots à une température dans une plage de 345 °C à 410° C, et laminé à froid pour obtenir une tôle ayant un calibre final de 0,7 mm à 4,0 mm.
EP18753328.6A 2017-08-02 2018-07-30 Panneau extérieur d'automobile fabriqué à partir d'un produit en tôle d'alliage d'aluminium série 6xxx Active EP3662092B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17184490 2017-08-02
PCT/EP2018/070532 WO2019025335A1 (fr) 2017-08-02 2018-07-30 Panneau extérieur d'automobile constitué d'un produit en feuille d'alliage d'aluminium de série 6xxx

Publications (2)

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

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US (1) US20210025046A1 (fr)
EP (1) EP3662092B1 (fr)
WO (1) WO2019025335A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553513A (zh) * 2019-09-25 2021-03-26 苹果公司 由回收铝废料制成的美观铝合金
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
EP3461635A1 (fr) 2004-11-16 2019-04-03 Aleris Aluminum Duffel BVBA Matériau en feuille composite d'aluminium
WO2007129391A1 (fr) 2006-05-01 2007-11-15 Ibiden Co., Ltd. Unité de montage de gabarit de cuisson, unité de démontage de gabarit de cuisson, appareil de circulation, procédé de moulage de céramique de cuisson, et processus de production de structure de nid d'abeille
EP1852251A1 (fr) 2006-05-02 2007-11-07 Aleris Aluminum Duffel BVBA Matériel de tole d'aluminium composite
EP2156945A1 (fr) 2008-08-13 2010-02-24 Novelis Inc. Produit de tôle plaquée automobile
EP2110235A1 (fr) * 2008-10-22 2009-10-21 Aleris Aluminum Duffel BVBA Produit de feuille en rouleau d'alliage Al-Mg-Si doté d'un ourlet convenable
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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WO2019025335A1 (fr) 2019-02-07
EP3662092A1 (fr) 2020-06-10
US20210025046A1 (en) 2021-01-28

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