EP3175009B1 - Al-casting alloy - Google Patents

Al-casting alloy Download PDF

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Publication number
EP3175009B1
EP3175009B1 EP15750917.5A EP15750917A EP3175009B1 EP 3175009 B1 EP3175009 B1 EP 3175009B1 EP 15750917 A EP15750917 A EP 15750917A EP 3175009 B1 EP3175009 B1 EP 3175009B1
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EP
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Prior art keywords
casting alloy
content
casting
contained
alloy according
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EP15750917.5A
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German (de)
French (fr)
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EP3175009A1 (en
Inventor
Klaus Greven
Thomas Buschjohann
Manikandan Loganathan
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KSM Castings Group GmbH
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KSM Castings Group GmbH
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    • 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
    • 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
    • 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

Definitions

  • the invention relates to an aluminum casting alloy.
  • the invention is therefore based on the object to further improve such low-Si Al casting alloy in terms of their castability, without their mechanical properties are excessively adversely affected.
  • Such an Al casting alloy has an improved castability compared with the prior art, in particular for low wall thicknesses and / or long flow paths to be cast.
  • the selection of alloy constituents according to the invention in the stated order of magnitude thus leads to an improvement in castability, without the mechanical properties being adversely affected.
  • the alloys according to the invention may contain production-related impurities, e.g. Pb, Ni, etc., as well known to those skilled in the art.
  • Si with a content of more than 3.8 to 5.5 wt .-%, preferably from more than 3.8 to 5 , 0 wt .-%, most preferably of 4.0 to 5.0 wt .-%, is contained.
  • Si is contained at a content of 5.0 to 5.8 wt .-%.
  • Mg is present at a content of 0.15 to less than 0.50 wt.%, Preferably to less than 0.40 wt. , is included. It may be advantageous if Mg is present at a level of from 0.15 to less than 0.35% by weight, preferably from 0.20 to 0.30% by weight, more preferably less than 0.30% by weight. % is included. For some applications, it may be advantageous to include Mg at a level of from 0.30 to 0.35% by weight.
  • Cr is contained with a content of more than 0.05 to less than 0.25 wt .-%.
  • Cr is contained at a content of 0.10 to 0.20 wt .-%, preferably from 0.12 to 0.17 wt .-%.
  • Fe is contained at a content of 0.01 to 0.15 wt .-%.
  • Fe is contained at a level of up to 0.12 wt .-%, preferably from 0.01 to 0.12 wt .-%.
  • Mn is present at a level of from 0.01 to 0.05% by weight.
  • Mn is present at a level of up to 0.03% by weight, preferably from 0.01 to 0.03% by weight.
  • Ti In order to optimize castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous for Ti to have a content of from 0.05 to less than 0.2% by weight, preferably from 0.10 to less than 0.2 Wt .-%, particularly preferably from more than 0.15 to less than 0.2 wt .-%, is contained. For some applications, it may be advantageous if Ti is contained at a level of up to 0.03 wt .-%, preferably from 0.01 to 0.03 wt .-%.
  • Cu is present at a content of less than 0.006 wt .-%, preferably from 0.001 to 0.005 wt .-%.
  • Sr is contained with a content of 0.015 to 0.025 wt .-%.
  • Sr may be advantageous to include Sr at a level of from 0.019 to 0.024 weight percent.
  • Zr is present at a content of 0.001 to 0.005 wt .-%.
  • Zn is present at a level of from 0.001 to 0.005% by weight.
  • impurities For many applications it may be advantageous to contain impurities with a content of ⁇ 0.05% by weight. For various applications, it may also be advantageous if impurities with a content of ⁇ 0.005 wt .-% are included.
  • the aluminum casting alloy according to the invention is a low-pressure Al casting alloy.
  • the invention also relates to a method for producing a cast component made of an Al casting alloy according to one of claims 1 to 16, in which the low-pressure casting method is used.
  • the Al cast alloy is a counter pressure (CPC) Al casting alloy.
  • the invention also relates to a method for producing a cast component from an Al casting alloy according to one of claims 1 to 16, in which the low-pressure counter-pressure casting method is used.
  • wheel or pivot bearings of motor vehicles from the casting alloy according to the invention can advantageously squeeze casting, gravity die casting or die casting, in particular the Thixo-, Rheo - or low-pressure sand casting, find application.
  • the cast components are subjected to a two-stage heat treatment, namely solution heat treatment and subsequent heat aging. It may be advantageous if the cast component is quenched in air or preferably water between the two heat treatment stages.
  • the cast component after the casting process between 530 ° C and 550 ° C for 6 to 10h, preferably between 540 ° C and 550 ° C for 7 to 9 h, especially for 8 to 9h, most preferably between more than 540 ° C and 550 ° C for 7 to 9 h, in particular for 8 to 9h, solution-annealed.
  • the cast component after the casting process between 180 ° C and 210 ° C for 1 to 8h, especially for 1 to 6.5h, preferably between 180 ° C and 190 ° C for 1 to 6.5h, in particular for 4 to 6.5 hours, more preferably between 180 ° C and less than 190 ° C for 4 to 6.5 hours, especially for 5 to 6.5 hours, is tempered.
  • the invention further provides for the use of an Al casting alloy according to one of the claims or a particularly heat-treated cast component according to one of the claims for chassis parts of motor vehicles, preferably for wheel-guiding components of motor vehicles, very particularly preferably for damper stilts, wheel carriers or pivot bearings of motor vehicles.
  • the invention further provides for the use of an Al casting alloy according to one of the claims or a particularly heat-treated cast component according to one of the claims for rims of motor vehicles.
  • Cast components according to the invention which are produced from an Al casting alloy according to one of the claims and / or according to a method according to one of the claims, are distinguished by the fact that, despite the improved castability, no excessively negative influence on their mechanical properties obtained after a heat treatment, in particular the Yield point R P 0.2 from 300 to 325 MPa, preferably from 305 to 310 MPa, and / or the elongation at break A5 from 4 to 10%, preferably from 7 to 9%, and / or the tensile strength R m of 350-375 MPa , preferably from 350 to 360 MPa.

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  • 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)
  • Body Structure For Vehicles (AREA)

Description

Die Erfindung bezieht sich auf eine Aluminium-Gusslegierung.The invention relates to an aluminum casting alloy.

Aus der DE 10 2013 108 127 A1 ist eine Al-Gusslegierung bekannt, welche nachfolgend angeführte Legierungsbestandteile

  • Si: 3,0 bis 3,8 Gew.-%
  • Mg: 0,3 bis 0,6 Gew.-%
  • Cr: 0,25 bis 0,35 Gew.-%
  • Fe: < 0,18 Gew.-%
  • Mn: < 0,06 Gew.-%
  • Ti: < 0,16 Gew.-%
  • Cu: < 0,006 Gew.-%
  • Sr: 0,010 bis 0,030 Gew.-%
  • Zr: < 0,006 Gew.-%
  • Zn: <0 ,006 Gew.-%
  • Verunreinigungen: < 0,1 Gew.-%, vorzugsweise < 0,005 Gew.-%
  • enthält und jeweils zu 100 Gew.-% mit Al ergänzt ist.
From the DE 10 2013 108 127 A1 For example, an Al-casting alloy is known, which alloy components listed below
  • Si: 3.0 to 3.8% by weight
  • Mg: 0.3 to 0.6 wt%
  • Cr: 0.25 to 0.35 wt%
  • Fe: <0.18 wt%
  • Mn: <0.06 wt%
  • Ti: <0.16 wt%
  • Cu: <0.006 wt%
  • Sr: 0.010 to 0.030 wt%
  • Zr: <0.006 wt%
  • Zn: <0.006% by weight
  • Impurities: <0.1% by weight, preferably <0.005% by weight
  • contains and in each case to 100 wt .-% is supplemented with Al.

Ausgehend von diesem Stand der Technik, der eine Si-arme Al-Gusslegierung mit optimierten mechanischen Eigenschaften offenbart, welche dadurch bei ihrer Verwendung zur Herstellung von Gussbauteilen, insbesondere im Fahrwerksbereich von Kraftfahrzeugen, vorteilhaft zu Materialeinsparungen führt, hat sich jedoch gezeigt, dass bei komplexeren Geometrien der zu gießenden Gussbauteile Probleme bei der Gießbarkeit entstehen können.Based on this prior art, which discloses a low-Si Al casting alloy with optimized mechanical properties, which thereby advantageously leads to material savings in its use for the production of cast components, in particular in the chassis of motor vehicles, it has been found that more complex Geometries of the casting components to be cast may cause problems in castability.

Der Erfindung liegt daher die Aufgabe zugrunde, eine solche Si-arme Al-Gusslegierung hinsichtlich ihrer Gießbarkeit weiter zu verbessern, ohne dass deren mechanischen Eigenschaften übermäßig negativ beeinflusst werden.The invention is therefore based on the object to further improve such low-Si Al casting alloy in terms of their castability, without their mechanical properties are excessively adversely affected.

Dies wird gemäß der Erfindung durch eine Al-Gusslegierung erzielt, die nachfolgend angeführte Legierungsbestandteile

  • Si: > 3,8 bis 5,8 Gew.-%
  • Mg: 0,1 bis 0,6 Gew.-%
  • Cr: 0,05 bis 1,3 Gew.-%
  • Fe: < 0,18 Gew.-%
  • Mn: < 0,06 Gew.-%
  • Ti: < 0,2 Gew.-%
  • Cu: ≤ 0,03 Gew.-%
  • Sr: 0,010 bis 0,030 Gew.-%
  • Zr <0,006 Gew.-%
  • Zn <0,006 Gew.-%
  • Verunreinigungen: < 0,1 Gew.-%
  • enthält und jeweils zu 100 Gew.-% mit Al ergänzt ist.
This is achieved according to the invention by an Al casting alloy, the alloying components listed below
  • Si:> 3.8 to 5.8% by weight
  • Mg: 0.1 to 0.6% by weight
  • Cr: 0.05 to 1.3 wt%
  • Fe: <0.18 wt%
  • Mn: <0.06 wt%
  • Ti: <0.2% by weight
  • Cu: ≦ 0.03 wt%
  • Sr: 0.010 to 0.030 wt%
  • Zr <0.006 wt%
  • Zn <0.006 wt%
  • Impurities: <0.1% by weight
  • contains and in each case to 100 wt .-% is supplemented with Al.

Eine solche Al-Gusslegierung weist gegenüber dem Stand der Technik eine verbesserte Gießbarkeit, insbesondere bei zu gießenden geringen Wandstärken und/oder langen Fließwegen, auf. Die erfindungsgemäße Auswahl an Legierungsbestandteilen in der genannten Größenordnung führt also zu einer Verbesserung der Gießbarkeit, ohne dass die mechanischen Eigenschaften nachteilig beeinflusst werden. Vorteilhaft kann sich auch eine Erhöhung der Bruchdehnung ergeben.Such an Al casting alloy has an improved castability compared with the prior art, in particular for low wall thicknesses and / or long flow paths to be cast. The selection of alloy constituents according to the invention in the stated order of magnitude thus leads to an improvement in castability, without the mechanical properties being adversely affected. Advantageously, there may also be an increase in the elongation at break.

Die erfindungsgemäßen Legierungen können herstellungsbedingte Verunreinigungen, z.B. Pb, Ni, etc., enthalten, wie sie dem Fachmann allgemein bekannt sind.The alloys according to the invention may contain production-related impurities, e.g. Pb, Ni, etc., as well known to those skilled in the art.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es für einige Anwendungsfälle vorteilhaft sein, wenn Si mit einem Gehalt von mehr als 3,8 bis 5,5Gew.-%, vorzugsweise von mehr als 3,8 bis 5,0 Gew.-%, ganz besonders bevorzugt von 4,0 bis 5,0 Gew.-%, enthalten ist. Für andere Anwendungsfälle kann es vorteilhaft sein, wenn Si mit einem Gehalt von 5,0 bis 5,8 Gew.-% enthalten ist.For an optimization of the castability without adversely affecting the mechanical characteristics of the cast component to be cast, it may be advantageous for some applications if Si with a content of more than 3.8 to 5.5 wt .-%, preferably from more than 3.8 to 5 , 0 wt .-%, most preferably of 4.0 to 5.0 wt .-%, is contained. For other applications, it may be advantageous if Si is contained at a content of 5.0 to 5.8 wt .-%.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Mg mit einem Gehalt von 0,15 bis weniger als 0,50 Gew.-%, vorzugsweise bis weniger als 0,40 Gew.-%, enthalten ist. Es kann vorteilhaft sein, wenn Mg mit einem Gehalt von 0,15 bis weniger als 0,35 Gew.-%, vorzugsweise von 0,20 bis 0,30 Gew.-%, ganz bevorzugt bis weniger als 0,30 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Mg mit einem Gehalt 0,30 bis 0,35 Gew.-% enthalten ist.For an optimization of the castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous if Mg is present at a content of 0.15 to less than 0.50 wt.%, Preferably to less than 0.40 wt. , is included. It may be advantageous if Mg is present at a level of from 0.15 to less than 0.35% by weight, preferably from 0.20 to 0.30% by weight, more preferably less than 0.30% by weight. % is included. For some applications, it may be advantageous to include Mg at a level of from 0.30 to 0.35% by weight.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Cr mit einem Gehalt von mehr als 0,05 bis weniger als 0,25 Gew.-% enthalten ist. Für einige Einsatzfälle kann es vorteilhaft sein, wenn Cr mit einem Gehalt von 0,10 bis 0,20 Gew.-%, vorzugsweise von 0,12 bis 0,17 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Cr mit einem Gehalt von 0,13 bis 0,18 Gew.-% enthalten ist.For an optimization of the castability without adversely influencing mechanical characteristics of the cast component to be cast, it may be advantageous if Cr is contained with a content of more than 0.05 to less than 0.25 wt .-%. For some applications, it may be advantageous if Cr is contained at a content of 0.10 to 0.20 wt .-%, preferably from 0.12 to 0.17 wt .-%. For some applications, it may be advantageous to contain Cr at a level of 0.13 to 0.18 wt%.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Fe mit einem Gehalt von 0,01 bis 0,15 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Fe mit einem Gehalt von bis zu 0,12 Gew.-%, vorzugsweise von 0,01 bis 0,12 Gew.-%, enthalten ist.For an optimization of the castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous if Fe is contained at a content of 0.01 to 0.15 wt .-%. For some applications, it may be advantageous if Fe is contained at a level of up to 0.12 wt .-%, preferably from 0.01 to 0.12 wt .-%.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Mn mit einem Gehalt von 0,01 bis 0,05 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Mn mit einem Gehalt von bis zu 0,03 Gew.-%, vorzugsweise von 0,01 bis 0,03 Gew.-%, enthalten ist.For an optimization of the castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous if Mn is present at a level of from 0.01 to 0.05% by weight. For some use cases it may be advantageous if Mn is present at a level of up to 0.03% by weight, preferably from 0.01 to 0.03% by weight.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Ti mit einem Gehalt von 0,05 bis weniger als 0,2 Gew.-%, vorzugsweise von 0,10 bis weniger als 0,2 Gew.-%, besonders bevorzugt von mehr als 0,15 bis weniger als 0,2 Gew.-%, enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Ti mit einem Gehalt von bis zu 0,03 Gew.-%, vorzugsweise von 0,01 bis 0,03 Gew.-%, enthalten ist.In order to optimize castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous for Ti to have a content of from 0.05 to less than 0.2% by weight, preferably from 0.10 to less than 0.2 Wt .-%, particularly preferably from more than 0.15 to less than 0.2 wt .-%, is contained. For some applications, it may be advantageous if Ti is contained at a level of up to 0.03 wt .-%, preferably from 0.01 to 0.03 wt .-%.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Cu mit einem Gehalt von weniger als 0,006 Gew.-%, vorzugsweise von 0,001 bis 0,005 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Cu mit einem Gehalt von 0,001 bis 0,03 Gew.-% enthalten ist.For an optimization of the castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous if Cu is present at a content of less than 0.006 wt .-%, preferably from 0.001 to 0.005 wt .-%. For some applications, it may be advantageous to include Cu at a level of from 0.001 to 0.03% by weight.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Sr mit einem Gehalt von 0,015 bis 0,025 Gew.-% enthalten ist. Für einige Anwendungsfälle kann es von Vorteil sein, wenn Sr mit einem Gehalt von 0,019 bis 0,024 Gew.-% enthalten ist.For an optimization of the castability without adversely affecting mechanical characteristics of the cast component to be cast, it may be advantageous if Sr is contained with a content of 0.015 to 0.025 wt .-%. For some applications, it may be advantageous to include Sr at a level of from 0.019 to 0.024 weight percent.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Zr mit einem Gehalt von 0,001 bis 0,005 Gew.-% enthalten ist.For an optimization of the castability without adversely influencing mechanical characteristics of the cast component to be cast, it may be advantageous if Zr is present at a content of 0.001 to 0.005 wt .-%.

Für eine Optimierung der Gießbarkeit ohne nachteilige Beeinflussung mechanischer Kennwerte des zu gießenden Gussbauteils kann es vorteilhaft sein, wenn Zn mit einem Gehalt von 0,001 bis 0,005 Gew.-% enthalten ist.For an optimization of the castability without adversely influencing mechanical characteristics of the cast component to be cast, it may be advantageous if Zn is present at a level of from 0.001 to 0.005% by weight.

Für zahlreiche Anwendungen kann es von Vorteil sein, wenn Verunreinigungen mit einem Gehalt von <0,05 Gew.-% enthalten sind. Für diverse Anwendungen kann es auch von Vorteil sein, wenn Verunreinigungen mit einem Gehalt von <0,005 Gew.-% enthalten sind.For many applications it may be advantageous to contain impurities with a content of <0.05% by weight. For various applications, it may also be advantageous if impurities with a content of <0.005 wt .-% are included.

Für gewisse Gussbauteile hat es sich als vorteilhaft herausgestellt, wenn die erfindungsgemäße Al-Gusslegierung eine Niederdruck-AI-Gusslegierung ist.For certain cast components, it has proven to be advantageous if the aluminum casting alloy according to the invention is a low-pressure Al casting alloy.

Entsprechend betrifft die Erfindung auch ein Verfahren zur Herstellung eines Gussbauteils aus einer Al-Gusslegierung nach einem der Ansprüche 1 bis 16, bei welchem das Niederdruck-Gießverfahren Anwendung findet.Accordingly, the invention also relates to a method for producing a cast component made of an Al casting alloy according to one of claims 1 to 16, in which the low-pressure casting method is used.

Für bestimmte Gussbauteile hat es sich als vorteilhaft herausgestellt, wenn die Al-Gusslegierung eine Gegendruck (CPC)-Al-Gusslegierung ist.For certain cast components, it has been found advantageous if the Al cast alloy is a counter pressure (CPC) Al casting alloy.

Entsprechend betrifft die Erfindung auch ein Verfahren zur Herstellung eines Gussbauteils aus einer Al-Gusslegierung nach einem der Ansprüche 1 bis 16, bei welchem das Niederdruck-Gegendruck-Gießverfahren Anwendung findet.Accordingly, the invention also relates to a method for producing a cast component from an Al casting alloy according to one of claims 1 to 16, in which the low-pressure counter-pressure casting method is used.

Als Fertigungsverfahren für Gussbauteile, insbesondere als Fahrwerksteile, vorzugsweise als radführende Teile, ganz bevorzugt als Dämpferstelzen, Radträger oder Schwenklager, von Kraftfahrzeugen aus der erfindungsgemäßen Gusslegierung sind grundsätzlich verschiedene Dauerformgießverfahren geeignet. Aufgrund der sehr guten mechanischen Eigenschaften bei hochbeanspruchten radführenden Teilen von Kraftfahrzeugen eignen sich aber besonders der Niederdruck-Kokillenguss sowie das Gegendruck-Gießverfahren (CPC-Verfahren), das auch als Gegendruck-Kokillengießverfahren bezeichnet wird, als Fertigungsverfahren.As a manufacturing process for cast components, in particular as suspension parts, preferably as wheel-guiding parts, very preferably as damper stilts, wheel or pivot bearings, of motor vehicles from the cast alloy according to the invention fundamentally different Dauerformgießverfahren are suitable. Due to the very good mechanical properties of highly stressed wheel-guiding parts of motor vehicles but are particularly low-pressure chill casting and the counter-pressure casting process (CPC process), which is also referred to as a counter-pressure Kokillengießverfahren, as a manufacturing process.

Als Fertigungsverfahren für Gussbauteile, insbesondere als Fahrwerksteile, vorzugsweise als radführende Teile, ganz bevorzugt als Dämpferstelzen, Radträger oder Schwenklager, von Kraftfahrzeugen aus der erfindungsgemäßen Gusslegierung kann vorteilhaft das Squeeze-Casting, der Schwerkraft-Kokillenguss oder der Druckguss, insbesondere der Thixo-, Rheo- oder Niederdruck-Sandguss, Anwendung finden.As a manufacturing process for cast components, especially as suspension parts, preferably as wheel-guiding parts, very preferably as Dämpferstelzen, wheel or pivot bearings of motor vehicles from the casting alloy according to the invention can advantageously squeeze casting, gravity die casting or die casting, in particular the Thixo-, Rheo - or low-pressure sand casting, find application.

Um die oben genannten Vorteile zu erzielen oder noch weiter zu entwickeln, ist es vorteilhaft, wenn die gegossenen Bauteile einer zweistufigen Wärmebehandlung, nämlich einem Lösungsglühen und einem anschließenden Warmauslagern, unterzogen werden. Es kann vorteilhaft sein, wenn das Gussbauteil zwischen den beiden Wärmebehandlungsstufen in Luft oder vorzugsweise Wasser abgeschreckt wird.In order to achieve or further develop the above-mentioned advantages, it is advantageous if the cast components are subjected to a two-stage heat treatment, namely solution heat treatment and subsequent heat aging. It may be advantageous if the cast component is quenched in air or preferably water between the two heat treatment stages.

Es kann zweckmäßig sein, wenn das Gussbauteil nach dem Gießprozess zwischen 530°C und 550°C für 6 bis 10h, vorzugsweise zwischen 540°C und 550°C für 7 bis 9 h, insbesondere für 8 bis 9h, ganz besonders bevorzugt zwischen mehr als 540°C und 550°C für 7 bis 9 h, insbesondere für 8 bis 9h, lösungsgeglüht wird.It may be expedient if the cast component after the casting process between 530 ° C and 550 ° C for 6 to 10h, preferably between 540 ° C and 550 ° C for 7 to 9 h, especially for 8 to 9h, most preferably between more than 540 ° C and 550 ° C for 7 to 9 h, in particular for 8 to 9h, solution-annealed.

Es kann zweckmäßig sein, wenn das Gussbauteil nach dem Gießprozess zwischen 180°C und 210°C für 1 bis 8h, insbesondere für 1 bis 6,5h, vorzugsweise zwischen 180°C und 190°C für 1 bis 6,5h, insbesondere für 4 bis 6,5h, besonders bevorzugt zwischen 180°C und weniger als 190°C für 4 bis 6,5h, insbesondere für 5 bis 6,5h, angelassen wird.It may be expedient if the cast component after the casting process between 180 ° C and 210 ° C for 1 to 8h, especially for 1 to 6.5h, preferably between 180 ° C and 190 ° C for 1 to 6.5h, in particular for 4 to 6.5 hours, more preferably between 180 ° C and less than 190 ° C for 4 to 6.5 hours, especially for 5 to 6.5 hours, is tempered.

Die Erfindung sieht ferner die Verwendung einer Al-Gusslegierung nach einem der Ansprüche oder eines insbesondere wärmebehandelten Gussbauteils nach einem der Ansprüche für Fahrwerksteile von Kraftfahrzeugen, vorzugsweise für radführende Bauteile von Kraftfahrzeugen, ganz besonders bevorzugt für Dämpferstelzen, Radträger oder Schwenklager von Kraftfahrzeugen vor.The invention further provides for the use of an Al casting alloy according to one of the claims or a particularly heat-treated cast component according to one of the claims for chassis parts of motor vehicles, preferably for wheel-guiding components of motor vehicles, very particularly preferably for damper stilts, wheel carriers or pivot bearings of motor vehicles.

Die Erfindung sieht weiterhin die Verwendung einer Al-Gusslegierung nach einem der Ansprüche oder eines insbesondere wärmebehandelten Gussbauteils nach einem der Ansprüche für Felgen von Kraftfahrzeugen vor.The invention further provides for the use of an Al casting alloy according to one of the claims or a particularly heat-treated cast component according to one of the claims for rims of motor vehicles.

Erfindungsgemäße Gussbauteile, die aus einer Al-Gusslegierung nach einem der Ansprüche und/oder nach einem Verfahren gemäß einem der Ansprüche hergestellt sind, zeichnen sich dadurch aus, dass trotz der verbesserten Gießbarkeit keine übermäßig negative Beeinflussung ihrer nach einer Wärmebehandlung erhaltenen mechanischen Kennwerte, insbesondere der Dehngrenze RP0,2 von 300 bis 325 MPa, vorzugsweise von 305 bis 310 MPa, und/oder der Bruchdehnung A5 von 4 bis 10 %, vorzugsweise von 7 bis 9 %, und/oder der Zugfestigkeit Rm von 350-375 MPa, vorzugsweise von 350 -360 MPa, erfolgt.Cast components according to the invention, which are produced from an Al casting alloy according to one of the claims and / or according to a method according to one of the claims, are distinguished by the fact that, despite the improved castability, no excessively negative influence on their mechanical properties obtained after a heat treatment, in particular the Yield point R P 0.2 from 300 to 325 MPa, preferably from 305 to 310 MPa, and / or the elongation at break A5 from 4 to 10%, preferably from 7 to 9%, and / or the tensile strength R m of 350-375 MPa , preferably from 350 to 360 MPa.

Claims (34)

  1. An Al casting alloy that contains the following alloy constituents
    Si: > 3.8 to 5.8 wt%
    Mg: 0.1 to 0.6 wt%
    Cr: 0.05 to 1.3 wt%
    Fe: < 0.18 wt%
    Mn: < 0.06 wt%
    Ti: < 0.2 wt%
    Cu: ≤ 0.03 wt%
    Sr: 0.010 to 0.030 wt%
    Zr <0.006 wt%
    Zn <0.006 wt%
    impurities: <0.1 wt%
    and is made up to 100 wt% with Al.
  2. The Al casting alloy according to Claim 1, characterised in that Si is contained at a content of more than 3.8 to 5.5 wt%, preferably of more than 3.8 to 5 wt%.
  3. The Al casting alloy according to Claim 1 or 2, characterised in that Si is contained at a content of 4.0 to 5.0 wt%.
  4. The Al casting alloy according to Claim 1 or 2, characterised in that Si is contained at a content of 5.0 to 5.8 wt%.
  5. The Al casting alloy according to any one of Claims 1 to 4, characterised in that Mg is contained at a content of 0.15 to less than 0.4 wt%.
  6. The Al casting alloy according to any one of Claims 1 to 4, characterised in that Mg is contained at a content of more than 0.15 to 0.35 wt%, preferably of 0.30 to 0.35 wt%.
  7. The Al casting alloy according to any one of Claims 1 to 5, characterised in that Cr is contained at a content of more than 0.05 to less than 0.25 wt%.
  8. The Al casting alloy according to any one of Claims 1 to 7, characterised in that Cr is contained at a content of 0.10 to 0.20 wt%, preferably of 0.12 to 0.17 wt%.
  9. The Al casting alloy according to any one of Claims 1 to 7, characterised in that Cr is contained at a content of 0.10 to 0.20 wt%, preferably of 0.13 to 0.18 wt%.
  10. The Al casting alloy according to any one of Claims 1 to 9, characterised in that Fe is contained at a content of up to 0.12 wt%, preferably at a content of 0.01 to 0.12 wt%.
  11. The Al casting alloy according to any one of Claims 1 to 9, characterised in that Fe is contained at a content of 0.01 to 0.15 wt%.
  12. The Al casting alloy according to any one of Claims 1 to 10, characterised in that Mn is contained at a content of up to 0.03 wt%, preferably of 0.01 to 0.03 wt%.
  13. The Al casting alloy according to any one of Claims 1 to 10, characterised in that Mn is contained at a content of 0.01 to 0.05 wt%.
  14. The Al casting alloy according to any one of Claims 1 to 13, characterised in that Ti is contained at a content of up to 0.03 wt%, preferably of 0.01 to 0.03 wt%.
  15. The Al casting alloy according to any one of Claims 1 to 13, characterised in that Ti is contained at a content of 0.05 to less than 0.2 wt%, preferably of 0.10 to less than 0.2%, particularly preferably of more than 0.15 to less than 0.2 wt%.
  16. The Al casting alloy according to any one of Claims 1 to 15, characterised in that Cu is contained at a content of 0.001 wt% to 0.03 wt%.
  17. The Al casting alloy according to any one of Claims 1 to 15, characterised in that Cu is contained at a content of < 0.006 wt%, preferably of 0.001 to 0.005 wt%.
  18. The Al casting alloy according to any one of Claims 1 to 17, characterised in that Sr is contained at a content of 0.015 to 0.025 wt%.
  19. The Al casting alloy according to any one of Claims 1 to 17, characterised in that Sr is contained at a content of 0.019 to 0.024 wt%.
  20. The Al casting alloy according to any one of Claims 1 to 19, characterised in that Zr is contained at a content of 0.001 to 0.005 wt%.
  21. The Al casting alloy according to any one of Claims 1 to 20, characterised in that Zn is contained at a content of 0.001 to 0.005 wt%.
  22. The Al casting alloy according to any one of Claims 1 to 21, characterised in that impurities are contained at a content of <0.05 wt%.
  23. The Al casting alloy according to any one of Claims 1 to 22, characterised in that impurities are contained at a content of <0.005 wt%.
  24. The Al casting alloys according to any one of Claims 1 to 23, characterised in that the Al casting alloy is a low-pressure Al casting alloy.
  25. The Al casting alloys according to any one of Claims 1 to 24, characterised in that the Al casting alloy is a counter-pressure (CPC) Al casting alloy.
  26. A method of manufacturing a cast component from an Al casting alloy according to any one of Claims 1 to 25, in which the low-pressure casting method is used.
  27. The method of manufacturing a cast component from an Al casting alloy according to any one of Claims 1 to 25, in which the counter-pressure (CPC) casting method is used.
  28. The method of manufacturing a cast component from an Al casting alloy according to any one of Claims 1 to 25, in which squeeze casting, gravity die casting or pressure casting, in particular thixocasting, rheocasting or low-pressure sand casting, is used.
  29. The method, in particular according to any one of Claims 26 to 28, of manufacturing a cast component from an Al casting alloy according to any one of Claims 1 to 25, in which the cast component is subjected to a two-step heat treatment, namely solution annealing and subsequent artificial ageing, after the casting process.
  30. The method according to Claim 29, characterised in that the cast component is quenched in air or preferably water between the two heat-treatment steps.
  31. The method according to any one of Claims 26 to 30, in which, after the casting process, the cast component is solution annealed between 530°C and 550°C for 6 to 10h, preferably between 540°C and 550°C for 7 to 9h, in particular for 8 to 9h, very particularly preferably between more than 540°C and 550°C for 7 to 9h, in particular for 8 to 9h.
  32. The method according to any one of Claims 26 to 31, in which, after the casting process, the cast component is tempered between 180°C and 210°C for 1 to 8h, in particular 1 to 6.5h, preferably between 180°C and 190°C for 1 to 6.5h, in particular for 4 to 6.5h, particularly preferably between 180°C and less than 190°C for 4 to 6.5h, in particular for 5 to 6.5h.
  33. Use of an Al casting alloy according to any one of the preceding claims or of a cast component manufactured thereof, in particular a heat-treated cast component, for motor vehicle chassis parts, preferably for motor vehicle wheel-guiding components, very particularly preferably for shock-absorber legs, wheel mounts and in particular for pivot bearings of motor vehicles.
  34. The use of an Al casting alloy according to any one of the preceding claims or a rim which is cast therefrom, in particular a heat-treated rim.
EP15750917.5A 2014-07-29 2015-07-09 Al-casting alloy Not-in-force EP3175009B1 (en)

Applications Claiming Priority (3)

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DE102014110752 2014-07-29
DE102014116822 2014-11-18
PCT/DE2015/100288 WO2016015711A1 (en) 2014-07-29 2015-07-09 Al-casting alloy

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EP3175009B1 true EP3175009B1 (en) 2018-09-12

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EP (1) EP3175009B1 (en)
JP (1) JP2017527689A (en)
CN (1) CN106460107A (en)
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WO (1) WO2016015711A1 (en)

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EP3175009A1 (en) 2017-06-07
DE102015111020A1 (en) 2016-02-04
DE112015003457A5 (en) 2017-04-13
US20170191146A1 (en) 2017-07-06
JP2017527689A (en) 2017-09-21
CN106460107A (en) 2017-02-22
US10323304B2 (en) 2019-06-18

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