EP0687742B1 - Die casting alloy - Google Patents

Die casting alloy Download PDF

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Publication number
EP0687742B1
EP0687742B1 EP95810386A EP95810386A EP0687742B1 EP 0687742 B1 EP0687742 B1 EP 0687742B1 EP 95810386 A EP95810386 A EP 95810386A EP 95810386 A EP95810386 A EP 95810386A EP 0687742 B1 EP0687742 B1 EP 0687742B1
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EP
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Prior art keywords
alloy
diecasting
max
alloy according
titanium
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Revoked
Application number
EP95810386A
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German (de)
French (fr)
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EP0687742A1 (en
Inventor
Ulrich Hielscher
Hubert Koch
Horst Sternau
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Aluminium Rheinfelden GmbH
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Aluminium Rheinfelden GmbH
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Application filed by Aluminium Rheinfelden GmbH filed Critical Aluminium Rheinfelden GmbH
Priority to DE29522065U priority Critical patent/DE29522065U1/en
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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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys

Definitions

  • the invention relates to a die-casting alloy based on aluminum-silicon.
  • a Japanese standard alloy AC4 A is known, which is made of Al, 8-10Si, max. 0.55 Fe, max. 0.25Cu, 0.3-0.6Mn, 0.3-0.6Mg, max. 0.2Ti, max. 0.25Zn known for sand and permanent mold casting.
  • the inventor has set himself the task of providing an aluminum die-casting alloy which, with regard to its mechanical properties both in the cast state and after heat treatment, meets the requirements placed on safety components such as wheels of passenger cars, is easy to weld, and has high corrosion resistance .
  • the alloy should be easy to cast.
  • the die-casting alloy according to the invention thus corresponds to the AlSi9Mg type with a considerably reduced iron content and a strontium refinement of the AlSi eutectic. Because of the high elongation values both in the as-cast state and after heat treatment, the alloy is particularly suitable for the production of safety components.
  • die-castings produced from the alloy according to the invention can be subjected to all heat treatments.
  • the mechanical properties achieved with heat treatment depend to a large extent on the magnesium content. Therefore, this can be tolerated very closely in production.
  • the magnesium content is tailored to the requirements of the die casting.
  • the alloy contains manganese to improve formability.
  • the relatively large proportion of eutectic silicon is refined by strontium.
  • the alloy according to the invention also has advantages in terms of fatigue strength.
  • the fracture toughness is higher due to the very small mixed crystals and the refined eutectic.
  • the alloy according to the invention is preferably produced as a horizontal continuous casting mass. This makes it possible to melt a die-casting alloy with low oxide contamination without complex melt cleaning: an important prerequisite for achieving high elongation values in the die-casting.
  • the permanently refined AlSiMg alloy according to the invention is preferably cleaned by means of a purge gas treatment with inert gases using an impeller.
  • the strontium content is preferably between 50 and 150 ppm and should generally not fall below 50 ppm, since otherwise the casting behavior can be impaired.
  • zirconium in addition, 0.05 to 0.3% by weight, in particular 0.15 to 0.20% by weight, of zirconium can be added to the invention.
  • Grain refinement is preferably carried out in the alloy according to the invention.
  • the alloy gallium phosphide and / or indium phosphide can be added in an amount corresponding to 1 to 250 ppm, preferably 1 to 30 ppm phosphorus.
  • the alloy for grain refinement can also contain titanium and boron, the addition of titanium and boron being effected via a master alloy with 1 to 2% by weight of titanium and 1 to 2% by weight of boron, the rest being aluminum.
  • the master alloy preferably contains 1.3 to 1.8% by weight of titanium and 1.3 to 1.8% by weight of boron and has a titanium / boron weight ratio of approximately 0.8 to 1.2.
  • the content of the master alloy in the alloy according to the invention is preferably set to 0.05 to 0.5% by weight.
  • the die-casting alloy according to the invention is highly suitable for die-casting safety components, in particular for die-casting vehicle wheels such as wheels for passenger cars.
  • the mechanical properties of the alloy according to the invention are shown in the table below. The values have been determined on test bars made from plates with a wall thickness of 2 to 4 mm. The ranges shown show the performance of the alloy, whereby the magnesium content and wall thickness should be restricted accordingly.
  • the alloy is characterized by very good castability, very good corrosion resistance and excellent weldability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Extrusion Of Metal (AREA)
  • Vending Machines For Individual Products (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Seal Device For Vehicle (AREA)
  • Ceramic Products (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Massaging Devices (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Finger-Pressure Massage (AREA)

Abstract

A die cast alloy consists of (wt.%); 9.5-11.5 Si, 0.1-5 Mg, 0.5-0.8 Mn, max. 0.15 Fe, max. 0.03 Cu, max. 0.10 Zn, max. 0.15 Ti, the balance Al, and 30-300 ppm Sr, for lasting refinement.

Description

Die Erfindung betrifft eine Druckgusslegierung auf der Basis Aluminium-Silizium.The invention relates to a die-casting alloy based on aluminum-silicon.

Die Verwendung von Aluminium-Silizium-Gusslegierungen zur Herstellung von Bauteilen im Druckgiessverfahren ist allgemein bekannt. Insbesondere an Sicherheitsbauteile werden heute Anforderungen gestellt, denen die bekannten Druckgusslegierungen längst nicht mehr in allen Belangen zu genügen vermögen.The use of aluminum-silicon casting alloys for the production of components in the die casting process is generally known. Today, in particular, safety components are subject to requirements which the known die-cast alloys are no longer able to meet in all respects.

In Chemical Abstracts vol. 93, no. 16, 1980, abstr. no. 93:154266 ist eine mit Sr modifizierte Standardlegierung AK9 (8-llSi, max. 0.8Fe, max. 1.0Cu, 0.2-0.5Mn, max. 0.3Ni, max. 0.5Zn, Rest A1) offenbart.In Chemical Abstracts vol. 93, no. 16, 1980, abstr. no.93: 154266 a Sr alloy modified AK9 (8-llSi, max.0.8Fe, max.1.0Cu, 0.2-0.5Mn, max.0.3Ni, max.0.5Zn, rest A1) is disclosed.

Aus Aluminiumschlüssel, Tafel J3, Seite 147, ist eine japanische Standardlegierung AC4 A bekannt, die aus Al, 8-10Si, max. 0.55 Fe, max. 0.25Cu, 0.3-0.6Mn, 0.3-0.6Mg, max. 0.2Ti, max. 0.25Zn für Sand- und Kokillenguss bekannt.From aluminum key, table J3, page 147, a Japanese standard alloy AC4 A is known, which is made of Al, 8-10Si, max. 0.55 Fe, max. 0.25Cu, 0.3-0.6Mn, 0.3-0.6Mg, max. 0.2Ti, max. 0.25Zn known for sand and permanent mold casting.

Angesichts dieser Gegebenheiten hat sich der Erfinder die Aufgabe gestellt, eine Aluminium-Druckgusslegierung bereitzustellen, die bezüglich ihrer mechanischen Eigenschaften sowohl im Gusszustand als auch nach einer Wärmebehandlung die an Sicherheitsbauteile wie beispielsweise Räder von Personenkraftwagen gestellten Anforderungen erfüllt, gut schweissbar ist sowie eine hohe Korrosionsbeständigkeit aufweist. Darüber hinaus soll die Legierung gut giessbar sein.In view of these circumstances, the inventor has set himself the task of providing an aluminum die-casting alloy which, with regard to its mechanical properties both in the cast state and after heat treatment, meets the requirements placed on safety components such as wheels of passenger cars, is easy to weld, and has high corrosion resistance . In addition, the alloy should be easy to cast.

Erfindungsgemäss wird die Aufgabe gelöst durch eine Druckgusslegierung auf der Basis Aluminium-Silizium, die

  • 9,5 bis 11,5 Gew.-% Silizium
  • 0,1 bis 0,5 Gew.-% Magnesium
  • 0, 5 bis 0,8 Gew.-% Mangan
  • max. 0,15 Gew.-% Eisen
  • max. 0,03 Gew.-% Kupfer
  • max. 0,10 Gew.-% Zink
  • max. 0,15 Gew.-% Titan
und als Rest Aluminium sowie zur Dauerveredelung 30 bis 300 ppm Strontium enthält.According to the invention the object is achieved by a die-casting alloy based on aluminum-silicon
  • 9.5 to 11.5 wt .-% silicon
  • 0.1 to 0.5 wt% magnesium
  • 0.5 to 0.8% by weight of manganese
  • Max. 0.15 wt% iron
  • Max. 0.03 wt% copper
  • Max. 0.10 wt% zinc
  • Max. 0.15 wt% titanium
and contains the rest aluminum and for permanent refinement 30 to 300 ppm strontium.

Die erfindungsgemässe Druckgusslegierung entspricht damit dem Typ AlSi9Mg mit erheblich reduziertem Eisengehalt und einer Strontium-Veredelung des AlSi-Eutektikums. Wegen der hohen Dehnungswerte sowohl im Gusszustand als auch nach einer Wärmebehandlung ist die Legierung insbesondere zur Herstellung von Sicherheitsbauteilen geeignet.The die-casting alloy according to the invention thus corresponds to the AlSi9Mg type with a considerably reduced iron content and a strontium refinement of the AlSi eutectic. Because of the high elongation values both in the as-cast state and after heat treatment, the alloy is particularly suitable for the production of safety components.

Obwohl im Gusszustand schon gute mechanische Werte vorhanden sind, können aus der erfindungsgemässen Legierung hergestellte Druckgussstücke allen Wärmebehandlungen unterzogen werden.Although good mechanical values are already present in the as-cast state, die-castings produced from the alloy according to the invention can be subjected to all heat treatments.

Die bei einer Wärmebehandlung erreichten mechanischen Eigenschaften sind in starkem Mass vom Magnesiumgehalt abhängig. Daher ist dieser in der Fertigung sehr eng zu tolerieren. Der Magnesiumgehalt wird auf die Anforderungen an das Druckgussstück abgestimmt.The mechanical properties achieved with heat treatment depend to a large extent on the magnesium content. Therefore, this can be tolerated very closely in production. The magnesium content is tailored to the requirements of the die casting.

Zur Verbesserung der Ausformbarkeit enthält die Legierung Mangan. Der relativ grosse Anteil eutektischen Siliziums wird durch Strontium veredelt. Gegenüber körnigen Druckgusslegierung mit höheren Verunreinigungen besitzt die erfindungsgemässe Legierung auch Vorteile hinsichtlich der Dauerschwingfestigkeit. Die Risszähigkeit ist aufgrund der sehr klein vorliegenden Mischkristalle und des veredelten Eutektikums höher.The alloy contains manganese to improve formability. The relatively large proportion of eutectic silicon is refined by strontium. Compared to granular die-cast alloy with higher impurities, the alloy according to the invention also has advantages in terms of fatigue strength. The fracture toughness is higher due to the very small mixed crystals and the refined eutectic.

Bevorzugt wird die erfindungsgemässe Legierung als Horizontal-Stranggussmassel hergestellt. Damit ist es möglich, ohne aufwendige Schmelzereinigung eine Druckgusslegierung mit geringer Oxidverunreinigung zu erschmelzen: eine wichtige Voraussetzung zur Erzielung hoher Dehnungswerte im Druckgussstück.The alloy according to the invention is preferably produced as a horizontal continuous casting mass. This makes it possible to melt a die-casting alloy with low oxide contamination without complex melt cleaning: an important prerequisite for achieving high elongation values in the die-casting.

Beim Einschmelzen ist jede Verunreinigung der Schmelze, insbesondere durch Kupfer oder Eisen, zu vermeiden. Die Reinigung der erfindungsgemässen dauerveredelten AlSiMg-Legierung erfolgt bevorzugt mittels einer Spülgasbehandlung mit inerten Gasen mittels Impeller.Any contamination of the melt, in particular by copper or iron, must be avoided during melting. The permanently refined AlSiMg alloy according to the invention is preferably cleaned by means of a purge gas treatment with inert gases using an impeller.

Der Strontiumgehalt liegt bevorzugt zwischen 50 und 150 ppm und sollte im allgemeinen nicht unter 50 ppm fallen, da sonst das Giessverhalten verschlechtert werden kann.The strontium content is preferably between 50 and 150 ppm and should generally not fall below 50 ppm, since otherwise the casting behavior can be impaired.

Der Erfindung kann zusätzlich noch 0,05 bis 0,3 Gew.-%, insbesondere 0,15 bis 0,20 Gew.-% Zirkonium zugegeben werden.In addition, 0.05 to 0.3% by weight, in particular 0.15 to 0.20% by weight, of zirconium can be added to the invention.

Bevorzugt wird bei der erfindungsgemässen Legierung eine Kornfeinung durchgeführt. Hierzu kann der Legierung Galliumphosphid und/oder Indiumphosphid in einer Menge entsprechend 1 bis 250 ppm, vorzugsweise 1 bis 30 ppm Phosphor zugeführt werden. Zusätzlich kann die Legierung zur Kornfeinung auch Titan und Bor enthalten, wobei die Zugabe von Titan und Bor über eine Vorlegierung mit 1 bis 2 Gew.-% Titan und 1 bis 2 Gew.-% Bor, Rest Aluminium, erfolgt. Hierbei enthält die Vorlegierung bevorzugt 1,3 bis 1,8 Gew.-% Titan und 1,3 bis 1,8 Gew.-% Bor und weist ein Titan/Bor-Gewichtsverhältnis von etwa 0,8 bis 1,2 auf. Der Gehalt der Vorlegierung in der erfindungsgemässen Legierung wird bevorzugt auf 0,05 bis 0,5 Gew.-% eingestellt.Grain refinement is preferably carried out in the alloy according to the invention. For this purpose, the alloy gallium phosphide and / or indium phosphide can be added in an amount corresponding to 1 to 250 ppm, preferably 1 to 30 ppm phosphorus. In addition, the alloy for grain refinement can also contain titanium and boron, the addition of titanium and boron being effected via a master alloy with 1 to 2% by weight of titanium and 1 to 2% by weight of boron, the rest being aluminum. The master alloy preferably contains 1.3 to 1.8% by weight of titanium and 1.3 to 1.8% by weight of boron and has a titanium / boron weight ratio of approximately 0.8 to 1.2. The content of the master alloy in the alloy according to the invention is preferably set to 0.05 to 0.5% by weight.

Die erfindungsgemässe Druckgusslegierung ist in hohem Mass geeignet zum Druckgiessen von Sicherheitsbauteilen, insbesondere zum Druckgiessen von Fahrzeugrädern wie beispielsweise Räder für Personenkraftwagen.The die-casting alloy according to the invention is highly suitable for die-casting safety components, in particular for die-casting vehicle wheels such as wheels for passenger cars.

Die mechanischen Eigenschaften der erfindungsgemässen Legierung ergeben sich aus der nachfolgenden Tabelle. Die Werte sind an Probestäben, herausgearbeitet aus Platten mit 2 bis 4 mm Wanddicke, ermittelt worden. Die angegebenen Bereiche zeigen die Leistungsfähigkeit der Legierung, wobei nach Magnesiumgehalt und Wanddicke entsprechend einzuschränken ist. Werkstoffzustand Rp0,2
N/mm2 Rm
N/mm2 A5
% HB
5/250-30 F 120-150 250-290 5-10 75- 95 T5 155-245 275-340 4- 9 90-110 T4 95-140 210-260 15-22 60- 75 T6 210-280 290-340 7-12 100-110 T7 120-170 200-240 15-20 60- 75 The mechanical properties of the alloy according to the invention are shown in the table below. The values have been determined on test bars made from plates with a wall thickness of 2 to 4 mm. The ranges shown show the performance of the alloy, whereby the magnesium content and wall thickness should be restricted accordingly. Material condition R p0.2
N / mm 2 R m
N / mm 2 A 5
% HB
5 / 250-30 F 120-150 250-290 5-10 75-95 T5 155-245 275-340 4- 9 90-110 T4 95-140 210-260 15-22 60-75 T6 210-280 290-340 7-12 100-110 T7 120-170 200-240 15-20 60-75

Wärmebehandlungsparameter sind nach europäischer Norm (EN):

F =
Gusszustand
T5 =
nach Formentnahme abgeschreckt und warmausgelagert
T4 =
lösungsgeglüht, abgeschreckt und (z.B. 144 h) kaltausgelagert
T6 =
lösungsgeglüht, abgeschreckt und warmausgelagert
T7 =
lösungsgeglüht, abgeschreckt und überaltert
Heat treatment parameters are according to the European standard (EN):
F =
As-cast condition
T5 =
quenched after mold removal and aged under warm conditions
T4 =
solution annealed, quenched and (e.g. 144 h) cold aged
T6 =
solution annealed, quenched and aged
T7 =
solution annealed, quenched and aged

Die Legierung zeichnet sich aus durch eine sehr gute Giessbarkeit, eine sehr gute Korrosionsbeständigkeit sowie eine ausgezeichnete Schweissbarkeit.The alloy is characterized by very good castability, very good corrosion resistance and excellent weldability.

Claims (8)

  1. Diecasting alloy with an aluminium-silicon base, characterised in that the alloy consists of
    9.5 to 11.5 w.% silicon
    0.1 to 0.5 w.% magnesium
    0.5 to 0.8 w.% manganese
    30 to 300 ppm strontium for permanent modification
    max 0.15 w.% iron
    max 0.03 w.% copper
    max 0.10 w.% zinc
    max 0.15 w.% titanium;
    optionally also
    0.05 to 0.3% zirconium,
    gallium phosphide and/or indium phosphide in a quantity corresponding to 1 to 250 ppm phosphorus,
    titanium and boron added via an aluminium prealloy at 1 to 2 w.% Ti and 1 to 2 w.% B;
    and the remainder being aluminium and unavoidable impurities.
  2. Diecasting alloy according to claim 1, characterised in that the strontium content is between 50 and 150 ppm.
  3. Diecasting alloy according to claim 1 or 2, characterised in that the alloy contains 0.15 to 0.20 w.% zirconium.
  4. Diecasting alloy according to any of claims 1 to 3, characterised in that the alloy contains gallium phosphide and/or indium phosphide in a quantity corresponding to 1 to 30 ppm phosphorus, for grain refining.
  5. Diecasting alloy according to any of claims 1 to 4, characterised in that prealloy contains 1.3 to 1.8 w.% titanium and 1.3 to 1.8 w.% boron and the titanium/boron weight ratio is between 0.8 and 1.2.
  6. Diecasting alloy according to any of claims 1 to 5, characterised in that the alloy contains 0.05 to 0.5 w.% prealloy.
  7. Use of a diecasting alloy according to any of claims 1 to 6 for diecasting of safety components.
  8. Use of a diecasting alloy according to any of Claims 1 to 6, for diecasting of vehicle wheels, in particular wheels for cars.
EP95810386A 1994-06-16 1995-06-12 Die casting alloy Revoked EP0687742B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29522065U DE29522065U1 (en) 1994-06-16 1995-06-12 Die casting alloy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1901/94 1994-06-16
CH01901/94A CH689143A5 (en) 1994-06-16 1994-06-16 Aluminum-silicon casting alloys with high corrosion resistance, particularly for safety components.

Publications (2)

Publication Number Publication Date
EP0687742A1 EP0687742A1 (en) 1995-12-20
EP0687742B1 true EP0687742B1 (en) 1997-09-10

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ID=4221247

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Application Number Title Priority Date Filing Date
EP95810386A Revoked EP0687742B1 (en) 1994-06-16 1995-06-12 Die casting alloy

Country Status (13)

Country Link
US (1) US6364970B1 (en)
EP (1) EP0687742B1 (en)
JP (1) JP3255560B2 (en)
KR (1) KR100754039B1 (en)
AT (1) ATE158025T1 (en)
AU (1) AU689872B2 (en)
BR (1) BR9502816A (en)
CA (1) CA2151884C (en)
CH (1) CH689143A5 (en)
DE (1) DE59500630D1 (en)
ES (1) ES2109798T3 (en)
NO (1) NO306867B1 (en)
ZA (1) ZA954057B (en)

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AU689872B2 (en) 1998-04-09
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US6364970B1 (en) 2002-04-02
CH689143A5 (en) 1998-10-30
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ZA954057B (en) 1996-01-19
BR9502816A (en) 1996-01-16
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CA2151884C (en) 2007-03-13
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ES2109798T3 (en) 1998-01-16
CA2151884A1 (en) 1995-12-17

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