EP0714994A1 - Deep drawable and weldable ALMgSiCu type aluminium alloy - Google Patents

Deep drawable and weldable ALMgSiCu type aluminium alloy Download PDF

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Publication number
EP0714994A1
EP0714994A1 EP95810692A EP95810692A EP0714994A1 EP 0714994 A1 EP0714994 A1 EP 0714994A1 EP 95810692 A EP95810692 A EP 95810692A EP 95810692 A EP95810692 A EP 95810692A EP 0714994 A1 EP0714994 A1 EP 0714994A1
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EP
European Patent Office
Prior art keywords
alloy
max
weight
annealing
almgsicu
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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.)
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EP95810692A
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German (de)
French (fr)
Inventor
Peter Furrer
Pierre Millet
Jürgen Timm
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3A Composites International AG
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Alusuisse Lonza Services Ltd
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Publication of EP0714994A1 publication Critical patent/EP0714994A1/en
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    • 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
    • C22F1/057—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 copper 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
    • 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium

Definitions

  • the invention relates to a deep-drawable and weldable aluminum alloy of the AlMgSiCu type in the form of strips or sheets, and to a method for the production thereof.
  • the inventor has set himself the task of creating an alloy of the type mentioned at the outset, which, with good strength, exhibits improved forming behavior compared to alloys according to the prior art, with the least possible springback after deep drawing.
  • the alloy (in% by weight) Si 0.55 - 0.70 Mg 0.35-0.45 Cu 0.60 - 0.85 Mn Max. 0.10 Fe Max. 0.25 as well as further alloy elements individually max. 0.05, total max. 0, 15 and aluminum as the rest.
  • the alloy composition according to the invention enables the production of deep-drawn body parts with optimal properties with regard to mechanical strength and forming behavior.
  • the copper content is between 0.65 and 0.75% by weight.
  • the average grain size in the sheet should not exceed 80 ⁇ m and is preferably less than 60 ⁇ m.
  • the alloy according to the invention is processed in a conventional manner by sheet or strip casting, hot and cold rolling to form a sheet.
  • the solution annealing is carried out in a continuous belt furnace in a temperature range from 520 ° C. to 580 ° C. or up to the solidus temperature of the alloy.
  • Optimal mechanical strength values and properties can be achieved if the alloy preferably at the latest 60 minutes after the solution annealing of a so-called stabilization annealing of a maximum of 24 hours in a temperature range from 50 ° C to 150 ° C.
  • the alloy can be rolled to its final thickness, solution-annealed and then heat-cured in a temperature range from 160 ° C to 220 ° C. Forming by a maximum of 25% after solution annealing and before final annealing in the temperature range mentioned is also advantageous.
  • the alloy according to the invention is particularly suitable for producing deep-drawn body parts.
  • Alloys of the composition Leg. 1 Leg. 2nd Leg. 3 (not according to the invention) Si 0.66 Si 0.63 Si 0.58 Mg 0.36 Mg 0.38 Mg 0.40 Cu 0.81 Cu 0.70 Cu 0.46 Mn 0.06 Mn 0.06 Mn 0.08 Fe 0.17 Fe 0.20 Fe 0.25 with aluminum as the rest and a standard body alloy AA6016 with Cu 0.93 as a further 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 alloys 1 and 2 according to the invention and the comparative alloys 3 and AA6016 determined on sheet metal samples are compared below.
  • 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 have confirmed the expected improvements in forming behavior with excellent strength values.

Abstract

AlMgSiCu-type Aluminium alloy contains in wt.%: 0.55-0.7 Si; 0.35-0.45 Mg; 0.6-0.85 Cu; max. 0.1 Mn; max. 0.25 Fe.

Description

Die Erfindung betrifft eine tiefziehbare und schweissbare Aluminiumlegierung vom Typ AlMgSiCu in der Form von Bändern oder Blechen sowie ein Verfahren zu ihrer Herstellung.The invention relates to a deep-drawable and weldable aluminum alloy of the AlMgSiCu type in the form of strips or sheets, and to a method for the production thereof.

In der Praxis bekannte Legierungen, die zur Herstellung von Karosserieblechen für die Automobilindustrie eingesetzt werden, sind in US-A-4 424 084 sowie EP-A-0 245 464 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 which are used for the production of body panels for the automotive industry are described in US Pat. Nos. 4,424,084 and EP-A-0 245 464. Each of these alloys has its advantages in that certain mechanical properties such as, for example, the strength are optimized, but usually with the acceptance of a deterioration in other properties such as, for example, the formability.

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 set himself the task of creating an alloy of the type mentioned at the outset, which, with good strength, exhibits improved forming behavior compared to alloys according to the prior art, with the least possible springback after deep drawing.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass die Legierung (in Gew.%) Si 0,55 - 0,70 Mg 0,35 - 0,45 Cu 0,60 - 0,85 Mn max. 0,10 Fe max. 0,25 sowie weitere Legierungselemente einzeln max. 0,05, insgesamt max. 0, 15 und Aluminium als Rest enthält.To achieve the object according to the invention, the alloy (in% by weight) Si 0.55 - 0.70 Mg 0.35-0.45 Cu 0.60 - 0.85 Mn Max. 0.10 Fe Max. 0.25 as well as further alloy elements individually max. 0.05, total max. 0, 15 and aluminum as the rest.

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 alloy according to the invention are the subject of dependent patent 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 properties with regard to mechanical strength and forming behavior.

Bei einer bevorzugten Legierungszusammensetzung liegt der Kupfergehalt zwischen 0, 65 und 0,75 Gew.%.In a preferred alloy composition, the copper content is between 0.65 and 0.75% by weight.

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 to 0.3% by weight, zinc, a further increase in strength combined with a slight improvement in the 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 µm.

Die erfindungsgemässe Legierung wird auf übliche Weise durch Strang- oder Bandgiessen, Warm- und Kaltwalzen zu einem Blech 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 processed in a conventional manner by sheet or strip casting, hot and cold rolling to form a sheet. To achieve the optimum properties of the alloy described above with regard to strength and forming behavior, it has proven to be particularly advantageous if the solution annealing is carried out in a continuous belt furnace in a temperature range from 520 ° C. to 580 ° C. or up to the solidus temperature of the alloy.

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 preferably at the latest 60 minutes after the solution annealing of a so-called stabilization annealing of a maximum of 24 hours in a temperature range from 50 ° C to 150 ° C.

Die Legierung kann bei Bedarf auf Enddicke abgewalzt, lösungsgeglüht und anschliessend in 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 its final thickness, solution-annealed and then heat-cured in a temperature range from 160 ° C to 220 ° C. Forming by a maximum of 25% after solution annealing and before final annealing in the temperature range mentioned is also advantageous.

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

Die erfindungsgemässe Legierung ist insbesondere geeignet zur Herstellung tiefgezogener Karosserieteile.The alloy according to the invention is particularly suitable for producing 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 alloy according to the invention result from the following description of preferred exemplary embodiments.

Legierungen der Zusammensetzung Leg. 1 Leg. 2 Leg. 3 (nicht erfindungsgemäss) Si 0,66 Si 0,63 Si 0,58 Mg 0,36 Mg 0,38 Mg 0,40 Cu 0,81 Cu 0,70 Cu 0,46 Mn 0,06 Mn 0,06 Mn 0,08 Fe 0,17 Fe 0,20 Fe 0,25 mit Aluminium als Rest sowie eine Standardkarosserielegierung AA6016 mit Cu 0,93 als weitere 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 erfindungsgemässen Legierungen 1 und 2 und der Vergleichslegierungen 3 sowie AA6016 sind nachfolgend einander gegenübergestellt. Rm Rp0,2 Rp0,2/Rm A10 n5% r (MPa) (MPa) (%) AA6016 222 114 0,50 28,0 0,27 0,55 Leg. 1 253 131 0,52 28,5 0,29 0,66 Leg. 2 242 124 0,51 29,0 0,29 0,68 +S 248 129 0,52 29,5 0,30 0,70 Leg. 3 218 111 0,51 27,5 0,28 0,62 +S: mit zusätzlicher Stabilisierungsglühung 100°C/10hAlloys of the composition Leg. 1 Leg. 2nd Leg. 3 (not according to the invention) Si 0.66 Si 0.63 Si 0.58 Mg 0.36 Mg 0.38 Mg 0.40 Cu 0.81 Cu 0.70 Cu 0.46 Mn 0.06 Mn 0.06 Mn 0.08 Fe 0.17 Fe 0.20 Fe 0.25 with aluminum as the rest and a standard body alloy AA6016 with Cu 0.93 as a further 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 alloys 1 and 2 according to the invention and the comparative alloys 3 and AA6016 determined on sheet metal samples are compared below. R m R p0.2 R p0.2 / R m A 10 n 5% r (MPa) (MPa) (%) AA6016 222 114 0.50 28.0 0.27 0.55 Leg. 1 253 131 0.52 28.5 0.29 0.66 Leg. 2nd 242 124 0.51 29.0 0.29 0.68 + S 248 129 0.52 29.5 0.30 0.70 Leg. 3rd 218 111 0.51 27.5 0.28 0.62 + S: with additional stabilization annealing 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.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 have confirmed the expected improvements in forming behavior with excellent strength values.

Claims (10)

Tiefziehbare und schweissbare Aluminumlegierung von Typ AlMgSiCu in der Form von Bändern oder Blechen, dadurch gekennzeichnet, dass sie (in Gew.%) Si 0,55 - 0,70 Mg 0,35 - 0,45 Cu 0,60 - 0,85 Mn max. 0,10 Fe max. 0,25
sowie weitere Legierungselemente einzeln max. 0,05, insgesamt max. 0,15 und Aluminium als Rest enthält. Thermoformable and weldable aluminum alloy of the type AlMgSiCu in the form of strips or sheets, characterized, that they (in% by weight) Si 0.55 - 0.70 Mg 0.35-0.45 Cu 0.60 - 0.85 Mn Max. 0.10 Fe Max. 0.25
as well as further alloy elements individually max. 0.05, total max. 0.15 and aluminum as the rest. Legierung nach Anspruch 1, dadurch gekennzeichnet, dass sie 0, 65 bis 0,75 Gew.% Cu enthält.Alloy according to claim 1, characterized in that it contains 0.65 to 0.75% by weight of Cu. Legierung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie 0,05 bis 0,4 Gew.%, insbesondere 0,1 bis 0,3 Gew.% Zn enthält.Alloy according to Claim 1 or 2, characterized in that it contains 0.05 to 0.4% by weight, in particular 0.1 to 0.3% by weight, of Zn. Legierung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie 0,05 bis 0,2 Gew.% V enthält.Alloy according to one of Claims 1 to 3, characterized in that it contains 0.05 to 0.2% by weight of V. Legierung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die mittlere Korngrösse max. 80 µm, vorzugsweise max. 60 µm beträgt.Alloy according to one of claims 1 to 4, characterized in that the average grain size is max. 80 µm, preferably max. Is 60 µm. Verfahren zur Herstellung einer Legierung nach einem der Ansprüche 1 bis 5 durch Strang- oder Bandgiessen, Warm- und Kaltwalzen, dadurch gekennzeichnet, dass eine Lösungsglühung in einem Banddurchlaufofen in einem Temperaturbereich von 520°C bis 580°C bzw. bis zur Solidustemperatur der Legierung durchgeführt wird.A process for producing an alloy according to any one of claims 1 to 5 by continuous casting or strip casting, hot and cold rolling, characterized in that solution annealing in a continuous strip furnace in a temperature range from 520 ° C to 580 ° C or up to Solidus temperature of the alloy is carried out. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Legierung nach der Lösungsglühung, vorzugsweise spätestens 60min nach der Lösungsglühung, einer Stabilisierungsglühung von maximal 24h in einem Temperaturbereich von 50°C bis 150°C unterzogen wird.A method according to claim 6, characterized in that the alloy after solution annealing, preferably at the latest 60min after solution annealing, is subjected to a stabilization annealing of a maximum of 24 hours in a temperature range from 50 ° C to 150 ° C. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Legierung nach der Lösungsglühung um max. 25% umgeformt und anschliessend in einem Temperaturbereich von 160°C bis 220°C ausgehärtet wird.A method according to claim 6 or 7, characterized in that the alloy after solution annealing by max. 25% formed and then cured in a temperature range of 160 ° C to 220 ° C. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Endglühung als Lackeinbrennung durchgeführt wird.A method according to claim 8, characterized in that the final annealing is carried out as a paint baking. Verwendung einer Legierung nach einem der Ansprüche 1 bis 5 zur Herstellung tiefgezogener Karosserieteile.Use of an alloy according to one of claims 1 to 5 for the production of deep-drawn body parts.
EP95810692A 1994-11-29 1995-11-03 Deep drawable and weldable ALMgSiCu type aluminium alloy Withdrawn EP0714994A1 (en)

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CH3601/94 1994-11-29
CH360194 1994-11-29

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047779A1 (en) * 1996-06-14 1997-12-18 Aluminum Company Of America Highly formable aluminum alloy rolled sheet
AU734733B2 (en) * 1997-06-12 2001-06-21 Atofina Flexible and tough poly(vinylidene fluoride)-based compositions and their method of preparation
CN109457147A (en) * 2018-12-28 2019-03-12 辽宁忠旺集团有限公司 A kind of aluminum strap and its production technology

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4424084A (en) 1980-08-22 1984-01-03 Reynolds Metals Company Aluminum alloy
JPS61272342A (en) * 1985-05-27 1986-12-02 Kobe Steel Ltd Aluminum alloy sheet excelling in formability and baking hardening and its production
WO1987002712A1 (en) * 1985-11-04 1987-05-07 Aluminum Company Of America Aluminum alloy vehicular member
JPH04247842A (en) * 1991-01-25 1992-09-03 Sky Alum Co Ltd Aluminum alloy sheet for automobile wheel and its manufacture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4424084A (en) 1980-08-22 1984-01-03 Reynolds Metals Company Aluminum alloy
JPS61272342A (en) * 1985-05-27 1986-12-02 Kobe Steel Ltd Aluminum alloy sheet excelling in formability and baking hardening and its production
WO1987002712A1 (en) * 1985-11-04 1987-05-07 Aluminum Company Of America Aluminum alloy vehicular member
EP0245464A1 (en) 1985-11-04 1987-11-19 Aluminum Co Of America Aluminum alloy vehicular member.
US4784921A (en) * 1985-11-04 1988-11-15 Aluminum Company Of America Aluminum alloy automotive material
JPH04247842A (en) * 1991-01-25 1992-09-03 Sky Alum Co Ltd Aluminum alloy sheet for automobile wheel and its manufacture

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 136 (C - 419) 30 April 1987 (1987-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 219 (C - 0943) 22 May 1992 (1992-05-22) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 25 (C - 1017) 18 January 1993 (1993-01-18) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047779A1 (en) * 1996-06-14 1997-12-18 Aluminum Company Of America Highly formable aluminum alloy rolled sheet
AU734733B2 (en) * 1997-06-12 2001-06-21 Atofina Flexible and tough poly(vinylidene fluoride)-based compositions and their method of preparation
CN109457147A (en) * 2018-12-28 2019-03-12 辽宁忠旺集团有限公司 A kind of aluminum strap and its production technology
CN109457147B (en) * 2018-12-28 2020-10-20 辽宁忠旺集团有限公司 Aluminum packing belt and production process thereof

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