EP0866738A1 - Procede de fabrication de bandes minces en alliage d'aluminium a haute resistance et formabilite - Google Patents
Procede de fabrication de bandes minces en alliage d'aluminium a haute resistance et formabiliteInfo
- Publication number
- EP0866738A1 EP0866738A1 EP96941719A EP96941719A EP0866738A1 EP 0866738 A1 EP0866738 A1 EP 0866738A1 EP 96941719 A EP96941719 A EP 96941719A EP 96941719 A EP96941719 A EP 96941719A EP 0866738 A1 EP0866738 A1 EP 0866738A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- strip
- alloy
- thickness
- strips
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- 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 a method for manufacturing strips of thickness less than 5 mm in aluminum alloys comprising as addition elements silicon and possibly magnesium, manganese and / or copper, by continuous casting between 2 cooled rolls. and possibly cold rolling, these strips, having a high mechanical strength and good formability, being intended for mechanical applications, in particular the automobile body.
- Strips of aluminum alloys intended for mechanical applications such as the automobile body are usually produced by semi-continuous casting of plates, hot rolling and cold rolling, with a certain number of intermediate or final heat treatments.
- Continuous casting methods can also be used, in particular continuous casting between 2 cooled rolls, which has the advantage of limiting and often avoiding the hot rolling operation, but is difficult to implement for alloys. heavily loaded with addition elements.
- patent US 4126486 to ALCAN describes a process for manufacturing strips of AISi alloy (Si between 4 and 15% by weight) with possible additions of Mg, Cu, Zn, Fe and / or Mn, obtained for example by continuous casting between 2 cylinders, at a speed> 0.25 m / min, with a thickness of between 5 and 8 mm, then cold rolling with a reduction rate greater than 60% and annealing.
- a casting structure is obtained having intermetallic compounds in the form of rods, which are transformed into fine particles by cold rolling, which improves the formability.
- Japanese patent application JP 62-207851 by SKY ALUMINUM relates to AlSiMg alloy strips with Si between 0.4 and 2.5% and Mg between 0.1 and 1.2% (by weight), with a fine intermetallic structure , obtained by continuous casting of a strip of thickness between 3 and 15 mm, then cold rolling, dissolution and quenching.
- These tapes can be used for automotive bodywork and other mechanical applications such as air conditioners or fuel tanks.
- This range of alloys is in a range of conventional composition of the 6000 series aluminum alloys which can be obtained by conventional casting, and it does not exploit the hardening potential of copper and silicon, because their formability is limited by the presence of coarse silicon phases and this limits its applications.
- the object of the invention is thus a method of manufacturing strips of aluminum alloy with high mechanical strength and good formability comprising: - the production of an aluminum alloy containing (by weight) of 0.5 13% Si, 0-2% Mg, and / or 0-1% manganese, and / or 0-2% Cu, and / or 0-2% Fe, the other elements being less than 0.5% each and 2% in total,
- the process optionally includes, on the one hand, annealing of the cast strip before rolling at a temperature between 420 and 600 ⁇ C depending on the composition of the alloy, on the other hand a heat treatment of the rolled strip by dissolving between 420 and 600 "C, quenching and tempering at a temperature ⁇ 300 ° C.
- the invention preferably applies to alloys of composition (% by weight):
- Si 2.6 - 13 Mg: 1.4 - 2 Cu ⁇ 2 Fe ⁇ 0.4 (and preferably ⁇ 0.25) Mn ⁇ 0.5.
- FIG. 1 represents, in an unlisted diagram having the applied force on the abscissa and the thickness of the strip on the ordinate, the different zones corresponding to the appearance of microstructural defects, in particular segregation.
- This diagram is taken from the article by P.M. THOMAS et al. mentioned above and is therefore part of the prior art.
- FIG. 2 presents in a diagram having for abscissa the thickness of the cast strip and for ordinate the specific force applied to the cylinders, the operating zone according to the invention.
- FIGS. 3 and 4 are cross-sectional micrographs of a cast strip representing respectively a healthy microstructure with fine and homogeneous dispersion of the intermetallics, and a microstructure with segregations unsuitable for further processing.
- FIGS. 5 to 9 respectively represent, for 5 different alloys, the points representative of the casting parameters of the different tests carried out, in a thickness-force diagram. Description of the invention
- the aluminum alloy used in the process according to the invention contains 0.5 to 13% of silicon. Above 13%, the formation of silicon phases is observed which adversely affects formability. Below 0.5%, the hardening provided by Si is insufficient to obtain sufficient mechanical characteristics for the envisaged applications such as automobile bodywork. Silicon can be combined with magnesium to allow the precipitation of metastable Mg2Si hardening phases. Too high Mg contents, above 2%, lead to segregation, all the more so as the force applied to the casting is high. The addition of copper or iron makes it possible to improve the mechanical resistance, but, beyond 2%, the ductility of the strip is reduced too much, and therefore its formability. The addition of manganese allows better control of the grain size.
- the Applicant has found, surprisingly, that it was necessary, for a given width of casting strip, to limit the force applied to the rolls during casting (sometimes called “separation force", because it is the force which opposes the separation of the cylinders from one another) within a particular area of the force / thickness diagram.
- the specific force cannot drop below 100 t / m, otherwise the strip would no longer be entrained and the surface condition would not be satisfactory. It is always less than 750 rpm and must be maintained below the line AB, and preferably below the line A'B ', in order to obtain a healthy microstructure such as that shown in FIG. 3.
- the laminated strip undergoes a heat treatment comprising, in a conventional manner, dissolution at a temperature slightly below the starting melting temperature, quenching and maturation at ambient temperature or tempering treatment at a temperature less than 300 ° C.
- a refining treatment was carried out using an aluminum-titanium-boron alloy of the AT5B type introduced into the liquid metal in the preparation furnace.
- the 5 alloys were cast between 2 hooped cylinders in special steel internally cooled with water, on a casting machine "3C" from the company PECHINEY RHENALU, to give bands of width 1.5 m, with different thicknesses and different effort values.
- the temperature at the outlet of the casting was between 220 and 350 ° C.
- FIG. 3 representing an example of a healthy microstructure, with fine intermetallic particles uniformly dispersed
- FIG. 4 a defective microstructure, with intermetallic segregations in the form of long streaks oriented in the direction of the flow, which make it unsuitable for further processing.
- the cast strips were then homogenized at 540 "C for 8 h, then cold rolled to 1 mm, dissolved at a temperature of 540" C in a passing oven, quenched and returned to 180 ° C for a duration varying from 30 min to 8 h.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9514881A FR2742165B1 (fr) | 1995-12-12 | 1995-12-12 | Procede de fabrication de bandes minces en alliage d'aluminium a haute resistance et formabilite |
FR9514881 | 1995-12-12 | ||
PCT/FR1996/001956 WO1997021508A1 (fr) | 1995-12-12 | 1996-12-09 | Procede de fabrication de bandes minces en alliage d'aluminium a haute resistance et formabilite |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0866738A1 true EP0866738A1 (fr) | 1998-09-30 |
EP0866738B1 EP0866738B1 (fr) | 2001-11-21 |
Family
ID=9485540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96941719A Revoked EP0866738B1 (fr) | 1995-12-12 | 1996-12-09 | Procede de fabrication de bandes minces en alliage d'aluminium a haute resistance et formabilite |
Country Status (9)
Country | Link |
---|---|
US (1) | US6193818B1 (fr) |
EP (1) | EP0866738B1 (fr) |
JP (1) | JP2000501995A (fr) |
KR (1) | KR100434808B1 (fr) |
AU (1) | AU1101297A (fr) |
DE (1) | DE69617265T2 (fr) |
ES (1) | ES2163664T3 (fr) |
FR (1) | FR2742165B1 (fr) |
WO (1) | WO1997021508A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101818289A (zh) * | 2010-05-21 | 2010-09-01 | 江苏亚太轻合金科技股份有限公司 | 一种易切削铝合金 |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999014518A1 (fr) * | 1997-09-15 | 1999-03-25 | Alusuisse Technology & Management Ag | Chemise de cylindre |
US7125612B2 (en) * | 2001-02-20 | 2006-10-24 | Alcoa Inc. | Casting of non-ferrous metals |
US7503378B2 (en) * | 2001-02-20 | 2009-03-17 | Alcoa Inc. | Casting of non-ferrous metals |
US6672368B2 (en) | 2001-02-20 | 2004-01-06 | Alcoa Inc. | Continuous casting of aluminum |
EP1260600B1 (fr) * | 2001-05-17 | 2006-10-25 | Furukawa-Sky Aluminum Corp. | Alliage d'aluminium pour feuilles et son procédé de fabrication |
US7464746B2 (en) * | 2006-08-09 | 2008-12-16 | Nucor Corporation | Method of casting thin cast strip |
US20080041501A1 (en) * | 2006-08-16 | 2008-02-21 | Commonwealth Industries, Inc. | Aluminum automotive heat shields |
US7846554B2 (en) | 2007-04-11 | 2010-12-07 | Alcoa Inc. | Functionally graded metal matrix composite sheet |
US8403027B2 (en) | 2007-04-11 | 2013-03-26 | Alcoa Inc. | Strip casting of immiscible metals |
US20090159160A1 (en) * | 2007-12-20 | 2009-06-25 | Commonwealth Industries, Inc. | Method for making high strength aluminum alloy sheet and products made by same |
DE102008046803B4 (de) * | 2008-09-11 | 2011-01-27 | Audi Ag | Aluminiumgusslegierung und Verfahren zur Herstellung eines Gussbauteils |
US8956472B2 (en) * | 2008-11-07 | 2015-02-17 | Alcoa Inc. | Corrosion resistant aluminum alloys having high amounts of magnesium and methods of making the same |
DE102009019269A1 (de) * | 2009-04-28 | 2010-11-11 | Audi Ag | Aluminium-Silizium-Druckgusslegierung für dünnwändige Strukturbauteile |
RU2501881C2 (ru) * | 2010-04-08 | 2013-12-20 | Леонид Мордухович Коганов | Способ холодной многопроходной прокатки тонких лент из алюминиевых сплавов |
JP6474582B2 (ja) * | 2014-10-24 | 2019-02-27 | 日産自動車株式会社 | 成形性に優れたアルミニウム合金板 |
US10030295B1 (en) | 2017-06-29 | 2018-07-24 | Arconic Inc. | 6xxx aluminum alloy sheet products and methods for making the same |
KR101964347B1 (ko) * | 2017-11-06 | 2019-04-01 | 한국생산기술연구원 | 알루미늄 합금 다이캐스팅재 및 이의 제조방법 |
CN111534729B (zh) * | 2020-06-11 | 2022-05-10 | 东北轻合金有限责任公司 | 一种高强铝合金板材横向不平度控制方法 |
KR20220058823A (ko) | 2020-10-30 | 2022-05-10 | 주식회사 태정기공 | 알루미늄 합금 소재를 적용한 고강도 파스너 성형공법 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1529305A (en) * | 1974-11-15 | 1978-10-18 | Alcan Res & Dev | Method of producing metal alloy products |
JPS62207851A (ja) * | 1986-03-10 | 1987-09-12 | Sky Alum Co Ltd | 成形加工用アルミニウム合金圧延板およびその製造方法 |
US5286315A (en) * | 1989-03-30 | 1994-02-15 | Nippon Steel Corporation | Process for preparing rollable metal sheet from quenched solidified thin cast sheet as starting material |
FR2713664B1 (fr) * | 1993-11-17 | 1996-05-24 | Pechiney Rhenalu | Alliage type Al-Si-Mg à ductilité et emboutissabilité améliorées et procédé d'obtention. |
US5571347A (en) * | 1994-04-07 | 1996-11-05 | Northwest Aluminum Company | High strength MG-SI type aluminum alloy |
US5503689A (en) * | 1994-04-08 | 1996-04-02 | Reynolds Metals Company | General purpose aluminum alloy sheet composition, method of making and products therefrom |
US5655593A (en) * | 1995-09-18 | 1997-08-12 | Kaiser Aluminum & Chemical Corp. | Method of manufacturing aluminum alloy sheet |
-
1995
- 1995-12-12 FR FR9514881A patent/FR2742165B1/fr not_active Expired - Lifetime
-
1996
- 1996-12-09 ES ES96941719T patent/ES2163664T3/es not_active Expired - Lifetime
- 1996-12-09 US US09/077,841 patent/US6193818B1/en not_active Expired - Fee Related
- 1996-12-09 WO PCT/FR1996/001956 patent/WO1997021508A1/fr not_active Application Discontinuation
- 1996-12-09 JP JP09521789A patent/JP2000501995A/ja not_active Ceased
- 1996-12-09 KR KR10-1998-0704332A patent/KR100434808B1/ko not_active IP Right Cessation
- 1996-12-09 DE DE69617265T patent/DE69617265T2/de not_active Expired - Fee Related
- 1996-12-09 AU AU11012/97A patent/AU1101297A/en not_active Abandoned
- 1996-12-09 EP EP96941719A patent/EP0866738B1/fr not_active Revoked
Non-Patent Citations (1)
Title |
---|
See references of WO9721508A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101818289A (zh) * | 2010-05-21 | 2010-09-01 | 江苏亚太轻合金科技股份有限公司 | 一种易切削铝合金 |
Also Published As
Publication number | Publication date |
---|---|
US6193818B1 (en) | 2001-02-27 |
FR2742165B1 (fr) | 1998-01-30 |
ES2163664T3 (es) | 2002-02-01 |
EP0866738B1 (fr) | 2001-11-21 |
KR100434808B1 (ko) | 2004-09-08 |
KR19990072038A (ko) | 1999-09-27 |
AU1101297A (en) | 1997-07-03 |
DE69617265D1 (de) | 2002-01-03 |
DE69617265T2 (de) | 2002-07-04 |
WO1997021508A1 (fr) | 1997-06-19 |
FR2742165A1 (fr) | 1997-06-13 |
JP2000501995A (ja) | 2000-02-22 |
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