EP0714993B1 - Deep drawable and weldable AlMgSi type aluminium alloy - Google Patents

Deep drawable and weldable AlMgSi type aluminium alloy Download PDF

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Publication number
EP0714993B1
EP0714993B1 EP19950810691 EP95810691A EP0714993B1 EP 0714993 B1 EP0714993 B1 EP 0714993B1 EP 19950810691 EP19950810691 EP 19950810691 EP 95810691 A EP95810691 A EP 95810691A EP 0714993 B1 EP0714993 B1 EP 0714993B1
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EP
European Patent Office
Prior art keywords
alloy
weight
max
annealing
deep
Prior art date
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Expired - Lifetime
Application number
EP19950810691
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German (de)
French (fr)
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EP0714993A1 (en
Inventor
Peter Furrer
Jürgen Timm
Margarete Bloeck
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
Alusuisse Technology and Management Ltd
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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
    • C22F1/043—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 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
    • C22C21/02—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
    • 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
    • C22F1/047—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

Definitions

  • the invention relates to a deep-drawn and weldable AlMgSi type aluminum alloy in the form of strips or sheets and a process for their manufacture.
  • the inventor has the Task, an alloy of the type mentioned to create a good strength compared to alloys improved forming behavior according to the prior art with the least possible springback after deep drawing shows.
  • the alloy composition according to the invention enables the production of deep-drawn body parts with optimal Mechanical strength and Forming behavior.
  • zinc By adding 0.05 to 0.4% by weight, in particular 0.1 up to 0.3% by weight zinc can further increase the strength combined with a slight improvement in formability can be achieved.
  • the average grain size in the sheet should not exceed 80 ⁇ m and is preferably less than 60 microns.
  • the alloy according to the invention is carried out in the usual way Continuous or strip casting, hot and cold rolling into one Sheet or strip processed.
  • Continuous or strip casting hot and cold rolling into one Sheet or strip processed.
  • the solution annealing in one Continuous belt furnace in a temperature range of 520 ° C up to 580 ° C or up to the solidus temperature of the alloy is carried out.
  • Optimal mechanical strength values and properties can be achieved if the alloy is preferably at the latest 60 min after the solution annealing of a so-called stabilization annealing of a maximum of 24h in a temperature range from 50 ° C to 150 ° C.
  • the alloy can be rolled to final thickness, solution annealed and then a temperature range of 160 ° C to 220 ° C can be thermoset. It is advantageous also a maximum of 25% deformation after solution annealing and before final annealing in the temperature range mentioned.
  • the alloy according to the invention is particularly suitable for the production of deep-drawn body parts.

Description

Die Erfindung betrifft eine tiefziehbare und schweissbare Aluminiumlegierung vom Typ AlMgSi in der Form von Bändern oder Blechen sowie ein Verfahren zu ihrer Herstellung.The invention relates to a deep-drawn and weldable AlMgSi type aluminum alloy in the form of strips or sheets and a process for their manufacture.

In der Praxis bekannte Legierungen, die zur Herstellung von Karosserieblechen für die Automobilindustrie eingesetzt werden, sind in DE-A-27 14 395, US-A-4 082 578 und EP-B-0 259 232 beschrieben. Jede dieser Legierungen hat ihre Vorzüge, indem gewisse mechanische Eigenschaften wie beispielsweise die Festigkeit optimiert sind, allerdings zumeist unter Inkaufnahme einer Verschlechterung anderer Eigenschaften wie beispielsweise des Umformvermögens.Alloys known in practice for the production of Body panels used for the automotive industry are in DE-A-27 14 395, US-A-4 082 578 and EP-B-0 259 232. Each of these alloys has its advantages by certain mechanical properties such as the strength is optimized, but usually with a trade-off deterioration of other properties such as for example the formability.

Legierungen der eingangs genannten Art sind in WO-A-95 14113 und in JP-A-05 070908 offenbart.Alloys of the type mentioned are in WO-A-95 14113 and in JP-A-05 070908.

Angesichts dieser Gegebenheiten hat sich der Erfinder die Aufgabe gestellt, eine Legierung der eingangs erwähnten Art zu schaffen, die bei guter Festigkeit ein gegenüber Legierungen nach dem Stand der Technik verbessertes Umformverhalten mit möglichst geringer Rückfederung nach dem Tiefziehen zeigt.In view of these circumstances, the inventor has the Task, an alloy of the type mentioned to create a good strength compared to alloys improved forming behavior according to the prior art with the least possible springback after deep drawing shows.

Zur erfindungsgemässen Lösung der Aufgabe führt eine Legierung mit den Merkmalen von Anspruch 1. An alloy with the features of claim 1 leads to the achievement of the object according to the invention.

Alle für die Legierungselemente verwendeten Gehaltsangaben beziehen sich auf Gewichtsprozente.All content information used for the alloying elements refer to percentages by weight.

Spezielle und weiterbildende Ausführungsarten der erfindungsgemässen Legierung sind Gegenstand von abhängigen Patentansprüchen.Special and further developing embodiments of the inventive Alloys are the subject of dependent claims.

Die erfindungsgemässe Legierungszusammensetzung ermöglicht die Herstellung von tiefgezogenen Karosserieteilen mit optimalen Eigenschaften bezüglich mechanischer Festigkeit und Umformverhalten. The alloy composition according to the invention enables the production of deep-drawn body parts with optimal Mechanical strength and Forming behavior.

Durch einen Zusatz von 0,05 bis 0,4 Gew.%, insbesondere 0,1 bis 0,3 Gew.% Zink kann eine weitere Festigkeitssteigerung verbunden mit einer leichten Verbesserung des Umformvermögens erreicht werden.By adding 0.05 to 0.4% by weight, in particular 0.1 up to 0.3% by weight zinc can further increase the strength combined with a slight improvement in formability can be achieved.

Ein zusätzlicher Gehalt an Vanadium von 0,05 bis 0,2 Gew.% führt zu einer weiteren Verbesserung des Umformverhaltens.An additional vanadium content of 0.05 to 0.2% by weight leads to a further improvement in the forming behavior.

Die mittlere Korngrösse im Blech sollte 80 µm nicht übersteigen und liegt bevorzugt unter 60 µm.The average grain size in the sheet should not exceed 80 µm and is preferably less than 60 microns.

Die erfindungsgemässe Legierung wird auf übliche Weise durch Strang- oder Bandgiessen, Warm- und Kaltwalzen zu einem Blech oder Band verarbeitet. Zur Erzielung der vorstehend beschriebenen optimalen Eigenschaften der Legierung bezüglich Festigkeit und Umformverhalten hat sich als besonders vorteilhaft herausgestellt, wenn die Lösungsglühung in einem Banddurchlaufofen in einem Temperaturbereich von 520°C bis 580°C bzw. bis zur Solidustemperatur der Legierung durchgeführt wird.The alloy according to the invention is carried out in the usual way Continuous or strip casting, hot and cold rolling into one Sheet or strip processed. To achieve the above described optimal properties of the alloy with respect Strength and forming behavior has proven to be special it is found to be advantageous if the solution annealing in one Continuous belt furnace in a temperature range of 520 ° C up to 580 ° C or up to the solidus temperature of the alloy is carried out.

Optimale mechanische Festigkeitswerte und Eigenschaften lassen sich erzielen, wenn die Legierung vorzugsweise spätestens 60 min nach der Lösungsglühung einer sogenannten Stabilisierungsglühung von maximal 24h in einem Temperaturbereich von 50°C bis 150°C unterzogen wird.Optimal mechanical strength values and properties can be achieved if the alloy is preferably at the latest 60 min after the solution annealing of a so-called stabilization annealing of a maximum of 24h in a temperature range from 50 ° C to 150 ° C.

Die Legierung kann bei Bedarf auf Enddicke abgewalzt, lösungsgeglüht und anschliessend einem Temperaturbereich von 160°C bis 220 °C warmausgehärtet werden. Vorteilhaft ist auch eine Umformung um maximal 25% nach der Lösungsglühung und vor der Endglühung im erwähnten Temperaturbereich.If necessary, the alloy can be rolled to final thickness, solution annealed and then a temperature range of 160 ° C to 220 ° C can be thermoset. It is advantageous also a maximum of 25% deformation after solution annealing and before final annealing in the temperature range mentioned.

Wenn mit der Legierung lackierte Karosserieteile hergestellt werden, kann es vorteilhaft sein, die Endglühung mit der Lackeinbrennung zu kombinieren.When body parts are painted with the alloy , it can be advantageous to use the final annealing to combine the paint baking.

Die erfindungsgemässe Legierung ist insbesondere geeignet zur Herstellung tiefgezogener Karosserieteile.The alloy according to the invention is particularly suitable for the production of deep-drawn body parts.

Weitere Vorteile, Merkmale und Einzelheiten der erfindungsgemässen Legierung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele.Further advantages, features and details of the inventive Alloy result from the description below preferred embodiments.

Eine Legierung der Zusammensetzung

  • Si 0,69
  • Mg 0,37
  • Cu 0,38
  • Mn 0,06
  • Fe 0,23
    • mit Aluminium als Rest und eine Standardkarosserielegierung AA6016 als Vergleichslegierung wurden auf übliche Weise durch Stranggiessen, Warm- und Kaltwalzen zu einem Blech mit einer Dicke von 1,3 mm verarbeitet. Die an Blechproben ermittelten mechanischen Festigkeitswerte und Eigenschaften der erfindungegemässen Legierung und der Vergleichslegierung sind nachfolgend einander gegenübergestellt. Rm (MPa) Rp0,2 (MPa) Rp0,2/Rm A10 (%) n5% r Erfindung 212 106 0,50 26,5 0,30 0,65 +S 213 111 0,52 28,0 0,31 0,68 AA6016 222 114 0,5 28,0 0,27 0,55 +S: mit zusätzlicher Stabilisierungsglühung 100°C/10h Die Bleche wurden in praxisnahen Versuchen tiefgezogen und weiteren, bei der Herstellung von Karosserieteilen üblichen Umformoperationen unterzogen. Die durchgeführten Praxistests haben die erwarteten Verbesserungen des Umformverhaltens bei gleichzeitig ausgezeichneten Festigkeitswerten bestätigt. Im Vergleich zur Standardkarosserielegierung AA6016 (Anticorodal-120) besitzt die erfindungsgemässe Legierung insbesondere eine tiefere Streckgrenze sowie höhere n- bzw. r-Werte, d.h. eine geringere Rückfederung und verbesserte Streckzieh- und Tiefzieheigenschaften.An alloy of the composition
  • Si 0.69
  • Mg 0.37
  • Cu 0.38
  • Mn 0.06
  • Fe 0.23
    • with aluminum as the remainder and a standard body alloy AA6016 as a comparison alloy were processed in the usual way by continuous casting, hot and cold rolling to a sheet with a thickness of 1.3 mm. The mechanical strength values and properties of the alloy according to the invention and the comparison alloy determined on sheet metal samples are compared below. R m (MPa) R p0.2 (MPa) R p0.2 / R m A 10 (%) n 5% r invention 212 106 0.50 26.5 0.30 0.65 + S 213 111 0.52 28.0 0.31 0.68 AA6016 222 114 0.5 28.0 0.27 0.55 + S: with additional stabilization annealing 100 ° C / 10h The sheets were deep-drawn in practical tests and subjected to further forming operations that are common in the manufacture of body parts. The practical tests carried out confirmed the expected improvements in forming behavior with excellent strength values. Compared to the standard body alloy AA6016 (Anticorodal-120), the alloy according to the invention in particular has a lower yield strength and higher n or r values, ie less springback and improved stretching and deep-drawing properties.

    Claims (8)

    1. Deep-drawable and weldable AlMgSi-type aluminium alloy in the form of strips or sheets, characterised in that the alloy contains
      0.55 - 0.70 % by weight Si
      0.35 - 0.45 % by weight Mg
      0.2 - 0.4 % by weight Cu
      and optionally also
      max. 0.15 % by weight Mn
      max. 0.25 % by weight Fe
      0.05 - 0.4 % by weight Zn
      0.05 - 0.2 % by weight V
      as well as the usual impurities individually to a max. of 0.05 and in total to a max. of 0.15, with the balance aluminium.
    2. Alloy according to claim 1, characterised in that it contains 0.1 to 0.3 % by weight Zn.
    3. Alloy according to claim 1 or claim 2, characterised in that the mean grain size is a max. of 80 µm, preferably a max. of 60 µm.
    4. Process for the production of an alloy according to one of claims 1 to 3 by continuous casting or strip casting and hot and cold rolling, characterised in that solution annealing is carried out in a belt kiln over a temperature range of 520°C to 580°C or to the solidus temperature of the alloy.
    5. Process according to claim 4, characterised in that, after the solution annealing, preferably no more than 60 minutes after the solution annealing, the alloy is subjected to stabilisation annealing for a maximum of 24 hours over a temperature range of 50°C to 150°C.
    6. Process according to claim 4 or claim 5, characterised in that the alloy is worked to a max. of 25 % after the solution annealing and is then aged over a temperature range of 160°C to 220°C.
    7. Process according to claim 6, characterised in that the final annealing is carried out as paint baking.
    8. Use of an alloy according to one of claims 1 to 3 for the production of deep-drawn body parts.
    EP19950810691 1994-11-29 1995-11-03 Deep drawable and weldable AlMgSi type aluminium alloy Expired - Lifetime EP0714993B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    CH360094 1994-11-29
    CH3600/94 1994-11-29
    CH03600/94A CH688379A5 (en) 1994-11-29 1994-11-29 Thermaformed and weldable aluminum alloy of the AlMgSi type

    Publications (2)

    Publication Number Publication Date
    EP0714993A1 EP0714993A1 (en) 1996-06-05
    EP0714993B1 true EP0714993B1 (en) 2000-03-08

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    ID=4259491

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19950810691 Expired - Lifetime EP0714993B1 (en) 1994-11-29 1995-11-03 Deep drawable and weldable AlMgSi type aluminium alloy

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    EP (1) EP0714993B1 (en)
    CH (1) CH688379A5 (en)
    DE (1) DE59507951D1 (en)

    Families Citing this family (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CH690916A5 (en) * 1996-06-04 2001-02-28 Alusuisse Tech & Man Ag Thermaformed and weldable aluminum alloy of the AlMgSi type.
    AUPO084796A0 (en) * 1996-07-04 1996-07-25 Comalco Aluminium Limited 6xxx series aluminium alloy
    EP0931170A1 (en) * 1996-09-30 1999-07-28 Alcan International Limited Aluminium alloy for rolled product process
    CH693673A5 (en) * 1999-03-03 2003-12-15 Alcan Tech & Man Ag Use of an aluminum alloy of the AlMgSi type for the production of structural components.
    DE102004022817A1 (en) * 2004-05-08 2005-12-01 Erbslöh Ag Decorative anodizable, easily deformable, mechanically highly loadable aluminum alloy, process for its production and aluminum product made from this alloy

    Family Cites Families (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4082578A (en) * 1976-08-05 1978-04-04 Aluminum Company Of America Aluminum structural members for vehicles
    FR2601040B1 (en) * 1986-07-07 1988-09-02 Cegedur SOLDERABLE AND WELDABLE ALUMINUM ALLOY AND MANUFACTURING METHOD THEREOF
    FR2617188B1 (en) * 1987-06-23 1989-10-20 Cegedur AL-BASED ALLOY FOR CASING AND PROCESS FOR OBTAINING
    JPH0674480B2 (en) * 1987-09-03 1994-09-21 本田技研工業株式会社 Forming and welding alloy sheet excellent in weldability, rust resistance, formability and bake hardenability, and method for producing the same
    FR2642436B1 (en) * 1988-12-21 1991-06-14 Pechiney Rhenalu A1 ALLOY CONTAINING ESSENTIALLY SI, MG AND CU FOR STAMPING
    JPH0441648A (en) * 1990-06-07 1992-02-12 Sumitomo Light Metal Ind Ltd High strength aluminum alloy for forming, excellent in baking hardenability
    JPH0570908A (en) * 1991-05-01 1993-03-23 Sumitomo Light Metal Ind Ltd Production of aluminum alloy material for forming
    CH685707A5 (en) * 1991-12-16 1995-09-15 Alusuisse Lonza Services Ag Body panel.
    JPH05279780A (en) * 1992-03-31 1993-10-26 Furukawa Alum Co Ltd Medium-strength aluminum alloy excellent in bendability and its production
    FR2713664B1 (en) * 1993-11-17 1996-05-24 Pechiney Rhenalu Al-Si-Mg alloy with improved ductility and stampability and process for obtaining it.

    Also Published As

    Publication number Publication date
    CH688379A5 (en) 1997-08-29
    EP0714993A1 (en) 1996-06-05
    DE59507951D1 (en) 2000-04-13

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