EP2888382A1 - Bande d'alliage d'aluminium résistante à la corrosion intercristalline et son procédé de fabrication - Google Patents

Bande d'alliage d'aluminium résistante à la corrosion intercristalline et son procédé de fabrication

Info

Publication number
EP2888382A1
EP2888382A1 EP13756051.2A EP13756051A EP2888382A1 EP 2888382 A1 EP2888382 A1 EP 2888382A1 EP 13756051 A EP13756051 A EP 13756051A EP 2888382 A1 EP2888382 A1 EP 2888382A1
Authority
EP
European Patent Office
Prior art keywords
aluminum alloy
alloy strip
rolling
grain size
annealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13756051.2A
Other languages
German (de)
English (en)
Other versions
EP2888382B1 (fr
Inventor
Henk-Jan Brinkman
Olaf Engler
Thomas Hentschel
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.)
Speira GmbH
Original Assignee
Hydro Aluminium Rolled Products GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=48782349&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2888382(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hydro Aluminium Rolled Products GmbH filed Critical Hydro Aluminium Rolled Products GmbH
Priority to EP13756051.2A priority Critical patent/EP2888382B1/fr
Publication of EP2888382A1 publication Critical patent/EP2888382A1/fr
Application granted granted Critical
Publication of EP2888382B1 publication Critical patent/EP2888382B1/fr
Active legal-status Critical Current
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Links

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
    • C22C21/06—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
    • 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
    • C22F1/047—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 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

Definitions

  • the invention relates to an aluminum alloy strip consisting of a
  • Aluminum alloy of type AA 5xxx which in addition to AI and unavoidable
  • Impurities has a Mg content of at least 4 wt .-%.
  • the invention relates to a process for the preparation of the inventive
  • Aluminum alloy strip as well as a component made of one
  • Aluminum magnesium (AlMg) alloys of type AA 5xxx are used in the form of sheets or plates or strips for the construction of welded or joined structures in shipbuilding, automotive and aircraft construction. They are characterized in particular by a high strength, which increases with increasing
  • Aluminum strip consisting of an AA5182 alloy with a Mg content of 4.65 wt .-%, which is suitable for use in the automotive industry known.
  • Aluminum alloy ribbons of the type AA5182 with a Mg content of at least 4 weight percent are likewise from the article Semi -Solid Processing of Alloys and Composites by Kang et al. and known from US 2003/0150587 AI.
  • the article Hot-Tear Susceptibility of Aluminum Wrought Alloys and the Effect of Grain Refining by Lin et al. concerns round bars made of his AA5182 alloy.
  • DE 102 31 437 A1 relates to corrosion-resistant aluminum alloy sheets, wherein a sufficient resistance to intergranular corrosion is achieved by the addition of Zn in a content of more than 0.4 wt .-%.
  • document GB 2 027 621 A discloses a method for producing an aluminum strip.
  • AlMg alloys of the type AA 5xxx with Mg contents of more than 3%, in particular more than 4%, are increasingly prone to intercrystalline corrosion when exposed to elevated temperatures. At temperatures of 70 - 200 ° C,
  • the susceptibility to intergranular corrosion is usually in a
  • ASTM G67 Standard test according to ASTM G67, in which the samples are exposed to nitric acid and the mass loss due to the release of ß-particles is measured.
  • ASTM G67 the mass loss for materials which are not resistant to intergranular corrosion is more than 15 mg / cm 2 . Appropriate materials and aluminum strips are therefore not suitable to be used in heat-stressed areas.
  • the object of the present invention is to propose an aluminum alloy strip of an AlMg alloy which, despite high strengths and Mg content of more than 4% by weight, in particular after deformation and subsequent application of temperature, is resistant to intergranular corrosion ,
  • a manufacturing method is to be specified, with which against intergranular corrosion resistant
  • Aluminum strips can be produced. Finally, against intercrystalline corrosion resistant components of a motor vehicle, for example
  • Body parts or body attachments such as doors, hoods and tailgates or other structural parts but also component parts made of an aluminum alloy of type AA 5xxx are proposed.
  • the object indicated above is achieved by an aluminum alloy strip which has a recrystallized microstructure, the particle size (KG) of the microstructure in ⁇ satisfying the following dependence on the Mg content (c_Mg) in% by weight:
  • the aluminum alloy of the aluminum alloy strip has the following composition in% by weight:
  • Residual AI and unavoidable impurities individually a maximum of 0.05 wt .-%, in total not more than 0.15 wt .-%.
  • Hot strips or soft annealed cold strips are provided.
  • the aluminum alloy ribbon of the present invention because of its relatively high Mg content, provides high strengths and yield strengths while being resistant to intergranular corrosion. It is therefore very suitable for use in heat-stressed areas in the automotive industry.
  • Aluminum alloy strip according to the invention additionally the following condition:
  • Aluminum alloy tape is greater than 110 MPa.
  • the tensile strength of the band is usually above 255 MPa.
  • a further advantageous embodiment of the aluminum alloy strip is achieved in that the aluminum alloy of the aluminum alloy strip has the following composition in% by weight:
  • Grain size can be achieved.
  • Aluminiumlegierungsbandes the grain size is a maximum of 50 ⁇ , since in the production of aluminum strips with grain sizes of more than 50 ⁇ from an aluminum alloy of type AA 5xxx with a Mg content of at least 4% by weight, the process reliability drops. By contrast, a particle size of at most 50 ⁇ m can be achieved in a process-stable manner.
  • the process stability for the production of microstructures with controlled grain size increases with decreasing grain size. This is the
  • Aluminum alloy strip has this thickness of 0.5 mm - 5 mm, making it ideal for most applications, such as in the automotive industry.
  • the aluminum alloy strip according to the invention can advantageously be configured by being cold rolled and finally soft annealed.
  • a recrystallizing soft annealing usually takes place at temperatures of 300 ° C - 500 ° C and allows the introduced in the rolling process
  • the aluminum alloy strip has a yield strength R p o, 2 of more than 120 MPa and a tensile strength R m of more than 260 MPa.
  • the aluminum alloy strip according to the invention which is resistant to intercrystalline corrosion also exceeds the strength properties of an aluminum alloy of the AA5182 type required in accordance with DIN485-2.
  • the above object is achieved by a method for producing an aluminum alloy strip comprising the following method steps:
  • Rolling degree of less than 40% preferably not more than 30%, particularly preferably not more than 25%,
  • the enumerated process steps lead in sum to the fact that due to the small Abwalzgrads in the cold rolling of the aluminum alloy strip to final thickness, a grain size can be provided after annealing, which meets the above-mentioned dependence on the Mg content.
  • the solidification of the strip is set before annealing, which determines the resulting grain size.
  • different grain size can be set, which can be tailored to the alloy composition. In this respect, an aluminum alloy strip which is resistant to intergranular corrosion can be produced.
  • Soft annealing i. the Abwalzgrad to final thickness during cold rolling is limited to less than 40%, preferably at most 30%, more preferably at most 25%.
  • an additional cold rolling step after an intermediate annealing at 300 ° C - 500 ° C instead.
  • Aluminum alloy ribbon recrystallized and converted again into a formable state.
  • the subsequent cold-rolling step with a degree of reduction of less than 40%, preferably not more than 30%, particularly preferably not more than 25%, results in that, in conjunction with the Mg contents of the aluminum alloy used
  • the soft annealing and / or the intermediate annealing take place in a batch furnace, in particular a chamber furnace or a continuous furnace. Both ovens lead to
  • the above-described object is achieved by a component for a motor vehicle, which at least partially consists of an aluminum alloy strip according to the invention.
  • the component is usually subjected to a coating, preferably a cathodic dip coating. Nevertheless, there are also possible uses of unpainted components made from the aluminum alloy strip according to the invention.
  • the aluminum alloy strip has excellent properties in terms of strength, forming properties and resistance to intergranular corrosion, so that in particular the heat load in a painting, a baking process typically 20 minutes at about 185 ° C takes little effect on the resistance of the component against intergranular corrosion.
  • the transformation to a component which was simulated by means of a stretching by 15% transverse to the original rolling direction, has only a small influence on the resistance to intergranular corrosion.
  • the mass loss values according to ASTM G67 are less than 15 mg / cm 2 .
  • the operation in temperature-stressed areas which was simulated by a heat load of 200 or 500 hours at 80 ° C, only a small effect on the resistance to intergranular corrosion.
  • the mass loss values according to ASTM G67 are less than 15 mg / cm 2 even after a corresponding temperature load.
  • Particularly advantageous is a component, if this as a body or a
  • Body attachment of a motor vehicle is formed.
  • Typical body parts are the fender or parts of the floor assembly, the roof, etc.
  • Body attachment parts are usually called doors and tailgates, etc., which are not firmly connected to the motor vehicle.
  • non-visible body parts or body parts are made from the aluminum alloy strip according to the invention. These are, for example, door inner parts or inner parts of tailgates but also floor panels, etc.
  • Door inner parts is given for example by the sunlight during the operation of a motor vehicle.
  • Body parts of a motor vehicle generally also moisture, for example in the form of splashing or condensation, exposed, so that resistance to intergranular corrosion must be required.
  • FIG. 1 is a schematic flowchart for an embodiment of a
  • Fig. 2 is a graph of grain size as a function of
  • Fig. 3 shows a component for a motor vehicle according to another
  • Embodiment On the basis of extensive tests, it was examined whether there was a relationship between the grain size of an aluminum alloy strip from a
  • Table 1 shows the various alloy compositions used to investigate the relationship between grain size, resistance to intergranular corrosion and yield strength.
  • the aluminum alloys listed in Table 1 contain aluminum as the balance
  • the grain size varied for example from 16 [im to 61 ⁇ , the
  • Fig. 1 shows the sequence of embodiments for the production of
  • step 1 a rolling billet of AA 5xxx aluminum alloy having a Mg content of at least 4% by weight is cast, for example, in DC continuous casting. Subsequently, the rolling ingot in process step 2 a
  • Homogenizing which can be carried out in one or more stages subjected.
  • temperatures of the rolling ingot are reached from 480 to 550 ° C for at least 0.5 h.
  • process step 3 the rolling ingot is then hot rolled, with typical temperatures of 280 ° C to 500 ° C can be achieved.
  • the final thicknesses of the hot strip are for example 2 to 12 mm. The hot strip thickness can be chosen so that after the
  • the aluminum alloy strip cold rolled to final thickness is subjected to soft annealing.
  • the soft annealing was carried out in a continuous furnace or in a chamber furnace to test the dependence of the corrosion properties of the chamber or continuous furnace.
  • the second path was with an intermediate annealing
  • Process step 3 is fed to a cold rolling 4a, which has a rolling degree of more than 30% or more than 50%, so that the aluminum alloy strip is preferably recrystallized throughout in a subsequent intermediate annealing.
  • the intermediate annealing was in the embodiments either in
  • the intermediate annealing is shown in FIG. 1 with method step 4b. in the
  • Process step 4c of FIG. 1 is the intermediate annealed
  • aluminum alloy strip is fed to cold rolling to final thickness, wherein the degree of rolling in method step 4c is less than 40%, preferably not more than 30%, particularly preferably not more than 25%.
  • the Aluminum alloy ribbon back into the soft state by a soft annealing, the soft annealing is performed either in the continuous furnace at 400 ° C to 450 ° C or in the chamber furnace at 330 ° C to 380 ° C.
  • a first heat treatment consisted of storing the aluminum strips for 20 minutes at 185 ° C to image the KTL cycle.
  • the KTL cycle was a series of measurements.
  • Aluminum alloy strips additionally stored for 200 hours or 500 hours at 80 ° C and then subjected to the corrosion test.
  • the aluminum alloy tapes were further stretched by about 15%, subjected to heat treatment at elevated temperature, and then subjected to intergranular corrosion test according to ASTM G67, in which the mass loss was measured.
  • Embodiments 11 to 19 are all resistant to intergranular
  • Fig. 2 the measured grain sizes are shown in dependence on the Mg content in wt .-% in the diagram.
  • the diagram also contains two curves A and B.
  • the straight line A indicates the grain sizes above which, for a specific Mg content: the aluminum alloy strip can be described as resistant to intergranular corrosion.
  • the curve B shows the limit from which the aluminum alloy strips have too low a yield strength of less than 110 MPa, so that they are not to be regarded as alloy AA 5182 according to DIN EN485-2.
  • the curve B is determined by the following equation:
  • FIG. 3 shows a typical component of a motor vehicle, shown schematically in the form of an inner door part.
  • Inner door parts 6 are usually made of a steel. However, the produced ones show
  • Aluminum alloy tapes that also the provision of high strength can be achieved with an intergranular corrosion resistance, provided that the grain size ratio is adjusted in relation to the Mg content according to the invention.
  • the inventive component according to FIG. 3 has a significantly lower weight than a comparable component made of steel and is nevertheless resistant to

Landscapes

  • 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)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne une bande d'alliage d'aluminium composée d'un alliage d'aluminium du type AA 5xxx contenant en plus d'Al et d'impuretés inévitables, du Mg à hauteur d'au moins 4 % en poids. L'invention vise à mettre en oeuvre une bande d'alliage d'aluminium composée d'un alliage AlMg, qui, malgré des rigidités élevées et une teneur en Mg d'au moins 4 % en poids, est résistante à la corrosion intercristalline. A cet effet, dans un premier mode de réalisation, la bande d'alliage d'aluminium présente une structure recristallisée, la taille des grains (KG) de la structure en μm dépendant de la teneur en Mg (c_Mg) en % en poids selon la relation suivante : KG ≥ 22 + 2*c_Mg et l'alliage d'aluminium de la bande d'alliage d'aluminium présentant la composition suivante en % en poids : Si ≤ 0,2 %, Fe ≤ 0,35 %, 0,04 % ≤ Cu ≤ 0,08 %, 0,2 % ≤ Mn ≤ 0,5 %, 4,35 % ≤ Mg ≤ 4,8 %, Cr ≤ 0,1 %, Zn < 0,25 %, Ti ≤ 0, 1 %, reste d'Al et impuretés inévitables représentant individuellement au plus 0,05 % en poids, et au total au plus 0,15 % en poids.
EP13756051.2A 2012-08-22 2013-08-22 Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication Active EP2888382B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13756051.2A EP2888382B1 (fr) 2012-08-22 2013-08-22 Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12181356 2012-08-22
EP13756051.2A EP2888382B1 (fr) 2012-08-22 2013-08-22 Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication
PCT/EP2013/067484 WO2014029853A1 (fr) 2012-08-22 2013-08-22 Bande d'alliage d'aluminium résistante à la corrosion intercristalline et son procédé de fabrication

Publications (2)

Publication Number Publication Date
EP2888382A1 true EP2888382A1 (fr) 2015-07-01
EP2888382B1 EP2888382B1 (fr) 2016-11-23

Family

ID=48782349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13756051.2A Active EP2888382B1 (fr) 2012-08-22 2013-08-22 Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication

Country Status (10)

Country Link
US (1) US10550456B2 (fr)
EP (1) EP2888382B1 (fr)
JP (1) JP6270844B2 (fr)
KR (1) KR101803520B1 (fr)
CN (2) CN110592441A (fr)
CA (1) CA2882691C (fr)
ES (1) ES2613857T3 (fr)
PT (1) PT2888382T (fr)
RU (1) RU2606664C2 (fr)
WO (1) WO2014029853A1 (fr)

Families Citing this family (10)

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ES2569664T3 (es) 2012-08-28 2016-05-12 Hydro Aluminium Rolled Products Gmbh Aleación de aluminio resistente a la corrosión intercristalina
CN115094282A (zh) * 2015-06-05 2022-09-23 诺维尔里斯公司 高强度5xxx铝合金以及其制造方法
CA2990303C (fr) * 2015-06-25 2019-12-17 Hydro Aluminium Rolled Products Gmbh Bande almg a haute resistance aisement faconnable et procede de production de celle-ci
WO2017182145A1 (fr) * 2016-04-19 2017-10-26 Hydro Aluminium Rolled Products Gmbh Matériau composite d'aluminium doté d'une couche anticorrosion
WO2019238449A1 (fr) * 2018-06-11 2019-12-19 Aleris Rolled Products Germany Gmbh Procédé de fabrication d'un produit en plaque d'alliage d'al-mg-mn ayant une résistance à la corrosion améliorée
JP7233533B2 (ja) * 2018-11-15 2023-03-06 シュトゥート・テオドール 第一の金属ストリップと少なくとも１つの更なる金属ストリップとからロールプロファイリングにより原線材を製造する方法
RU2722950C1 (ru) * 2020-02-07 2020-06-05 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Сплав на основе алюминия и способ получения изделия из него
KR20230118949A (ko) * 2021-03-12 2023-08-14 노벨리스 인크. 고강도 5xxx 알루미늄 합금 변형체 및 이의 제조 방법
CN114480928A (zh) * 2022-01-28 2022-05-13 全良金属(苏州)有限公司 一种电子产品用高强铝板及其制造方法
CN115652152B (zh) * 2022-11-30 2023-03-17 中铝材料应用研究院有限公司 可细化mig焊缝晶粒的5xxx铝合金、其制备方法及应用

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Also Published As

Publication number Publication date
KR101803520B1 (ko) 2017-11-30
CN104781430A (zh) 2015-07-15
CN110592441A (zh) 2019-12-20
JP2016504483A (ja) 2016-02-12
RU2015110064A (ru) 2016-10-10
RU2606664C2 (ru) 2017-01-10
KR20150065678A (ko) 2015-06-15
CA2882691A1 (fr) 2014-02-27
WO2014029853A1 (fr) 2014-02-27
CA2882691C (fr) 2017-11-07
US10550456B2 (en) 2020-02-04
EP2888382B1 (fr) 2016-11-23
PT2888382T (pt) 2017-02-10
ES2613857T3 (es) 2017-05-26
US20150159251A1 (en) 2015-06-11
JP6270844B2 (ja) 2018-01-31
US20160273084A2 (en) 2016-09-22

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