Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
  • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

• the invention relates to a method for producing a cast component from an aluminum die-casting alloy specified in the preamble of claim 1.
• Art also relates to a cast component of an aluminum die-casting alloy specified in the preamble of claim 11 Art.
• a cast component is to be created, by means of which, for example over a short time of 1 h, a heat stability at 205 ° C or, for example, over a long term of 1000 h heat stability at 150 ° C can be achieved.
• the short-term thermal stability is required, for example, so that the motor vehicle body in its production of a paint incineration, which takes place for example at 170 ° C for 20 min, is thermally stable accordingly.
• the long-term thermal stability is required, for example, so that the components corresponding temperatures, which during driving, for example by to be emitted by the engine or to act on the components by solar radiation.
• crashworthy cast components with a reduced ductility should be provided which have a yield strength Rp 0 , 2 of, for example, between 120 and 165 MPa and an elongation at break A 5 of ⁇ 7%.
• Rp 0 , 2 yield strength
• elongation at break A 5 of ⁇ 7% elongation at break A 5 of ⁇ 7%.
• alloys For these components to be created, for example, alloys must be used today which have a high proportion of the alloying elements Ti, Zr and Mo. However, these alloying elements are extremely expensive, which is why the cast components are ultimately also very expensive.
• Object of the present invention is therefore to provide a method and a cast component of the type mentioned, by means of which a cost-effective production can be realized.
• an aluminum die-casting alloy is used by which the cast component in the cast state has an elongation at break A 5 of ⁇ 10% and a yield strength Rp 0 , 2 of ⁇ 120 MPa, the cast component being subjected to a Stability annealing at a temperature of 120 to 260 ° C following the initial molding.
• the present cast component is by no means limited to use in the region of the crumple zones of a motor vehicle. Likewise, the present cast component can also be used at other places of use, for example in the area of the chassis or in the area of external attachments or components.
• a particularly cost-effective aluminum die-casting alloy can be created by having ⁇ 8.5% by weight, and in particular ⁇ 8.3% by weight, of silicon. This reduced silicon content of the diecasting alloy can be compensated in particular by an optimized magnesium content.
• this magnesium content is ⁇ 0.6 wt .-%, and in particular in a range of 0.02 to 0.3 wt .-%, is.
• an aluminum die casting alloy is used with the following alloying elements: 4 to 8,2 Wt .-% silicon 0.5 to 0.6 Wt .-% manganese 0.15 to 0.2 Wt .-% iron 0.04 to 0.2 Wt .-% magnesium 0.04 to 0.08 %
• strontium (140-180 ppm) and the balance aluminum with individually at most 0.05 wt .-% and a maximum of 0.2 wt .-% of production-related impurities.
• Such an aluminum diecasting alloy is thus characterized not only by an extremely low silicon content and an optimized magnesium content, but also in particular by the fact that the alloying elements Ti, Zr and Mo can be dispensed with for the most part. It is precisely these alloying elements that are decisive as price drivers for aluminum die-cast alloys.
• an aluminum diecasting alloy is used, by means of which the cast component has a yield strength Rp 0 , 2 of ⁇ 105, and in particular of ⁇ 110 MPa, in the cast state. Starting from this yield point Rp 0 , 2 , it is thus possible in a simple manner, after the heat treatment to achieve a required yield strength Rp 0 , 2 of ⁇ 120 MPa.
• the Stability annealing is carried out at a temperature of 200 to 240 ° C. In this way, a particularly short-term annealing can be achieved, which is in the range of, for example ⁇ 180 min, and in particular in the range of ⁇ 60 min.
• the stability annealing is carried out in particular so that the heat-treated cast component subsequently has a yield strength Rp 0.2 of ⁇ 115 to ⁇ 220 MPa, and in particular ⁇ 125 to ⁇ 165 MPa.
• Rp 0.2 yield strength
• particularly favorable components can be achieved, which are used, for example, in the bodies of passenger cars.
• an aluminum die cast alloy which comprises the following alloying elements: 7.8 to 8.2 Wt .-% silicon 0.5 to 0.6 Wt .-% manganese 0.15 to 0.2 Wt .-% iron 0.04 to 0.08 Wt .-% magnesium 0.04 to 0.08 %
• strontium (140-180 ppm) and the balance aluminum with individually at most 0.05 wt .-% and a maximum of 0.2 wt .-% of production-related impurities.
• This aluminum diecasting alloy is characterized in that it has an elongation at break A 5 of ⁇ 10% and a yield strength Rp 0.2 of ⁇ 120 MPa directly after casting or molding of the cast component directly in the cast state.
• the components created from the above-described aluminum die-casting alloy are subsequently subjected to a Stability annealing in the range of 120 to 260 ° C, and in particular in the range of 200 to 240 ° C for a time of ⁇ 180 min, for example about 20 min to 90 min, and in particular for a period of 30 minutes to 60 minutes.
• the cast component After the heat treatment, the cast component then has a yield strength Rp 0.2 of, for example, about 110 to 120 MPa, and in particular between 115 to 118 MPa.
• an aluminum die cast alloy is used for the cast components, which comprises the following alloying elements: 7.8 to 8.2 Wt .-% silicon 0.5 to 0.6 Wt .-% manganese 0.15 to 0.2 Wt .-% iron 0.08 to 0.12 Wt .-% magnesium 0.04 to 0.08 % By weight of titanium 14 * 10 -3 to 18 * 10 -3 % By weight strontium (140-180 ppm) and the balance aluminum with individually at most 0.05 wt .-% and a maximum of 0.2 wt .-% of production-related impurities.
• the aluminum diecasting alloy used in the present case again has a breaking elongation A 5 of ⁇ 10% and a yield strength Rp 0.2 of ⁇ 120 MPa in the cast state.
• the respective cast component in the cast state is then in turn subjected to a stability annealing at a temperature of, for example, about 120 to 260 ° C., and in particular a temperature of 200 to 240 ° C. over a period of ⁇ 180 min, for example about 20 min to about 90 min , and in particular in a period of about 30 minutes to about 60 minutes subjected.
• a stability annealing at a temperature of, for example, about 120 to 260 ° C., and in particular a temperature of 200 to 240 ° C. over a period of ⁇ 180 min, for example about 20 min to about 90 min , and in particular in a period of about 30 minutes to about 60 minutes subjected.
• the cast component has an elongation at break A 5 of ⁇ 7% and a yield strength Rp 0.2 of, for example, about 125 to 135 MPa, and in particular from 129 to 133 MPa.
• an aluminum die cast alloy is used for the respective cast components, which has the following alloying elements: 7.8 to 8.2 Wt .-% silicon 0.5 to 0.6 Wt .-% manganese 0.15 to 0.2 Wt .-% iron 0.12 to 0.16 Wt .-% magnesium 0.04 to 0.08 % By weight of titanium 14 * 10 -3 to 18 * 10 -3 % By weight strontium (140-180 ppm) and the balance aluminum with individually at most 0.05 wt .-% and a maximum of 0.2 wt .-% of production-related impurities.
• the casting components created with the abovementioned aluminum die-casting alloy have a breaking elongation A 5 of ⁇ 10% and a yield strength Rp 0.2 of ⁇ 120 MPa in the cast state, that is to say without heat treatment.
• the individual cast components are in turn subjected to a Stabilityglühung in a temperature range of 120 to 260 ° C, and in particular from 200 to 240 ° C.
• the stabilization annealing is again carried out over a period of up to 180 minutes, and here, for example, about 20 minutes to 90 minutes, and in particular in a period of 30 to 60 minutes.
• the heat-treated cast components have an elongation at break A 5 of ⁇ 7% and a yield strength Rp 0.2 in the range between 135 and 150 MPa, and in particular in the range between 141 and 148 MPa.
• an aluminum die casting alloy which has the following alloying elements: 7.8 to 8.2 Wt .-% silicon 0.5 to 0.6 Wt .-% manganese 0.15 to 0.2 Wt .-% iron 0.16 to 0.2 Wt .-% magnesium 0.04 to 0.08 %
• strontium (140-180 ppm) and the balance aluminum with individually at most 0.05 wt .-% and a maximum of 0.2 wt .-% of production-related impurities.
• the cast components created by the abovementioned die-cast aluminum alloy in the cast state before the heat treatment have an elongation at break A 5 of ⁇ 7% and a yield strength Rp 0.2 of ⁇ 120 MPa.
• the cast components are in turn subjected to a Stabilityglühung at a temperature of 120 to 260 ° C, and in particular between 200 and 240 ° C.
• the Stability annealing takes place in a period up to 180 min, in particular between 20 minutes and 90 minutes, and in particular between 30 minutes and 60 minutes.
• cast components are created in the present case, which have after the heat treatment, an elongation at break A 5 of ⁇ 7% and a yield strength Rp 0.2 in the range 145-165 MPa, and in particular in the range 151-161 MPa.
• the yield strength can be set to the values specified in Examples 1 to 4, depending on the area in which the respective cast component is used.
• the magnesium content can be reduced to max. 0.6 wt .-% be adjusted.
• the present one-stage stability annealing is carried out in a range from 120 to 260 ° C., and in particular from 200 to 240 ° C.
• an extremely short-term stability annealing can be achieved, it being ensured in all samples of the cast components that the required short-term heat stability or long-term stability is given, without the yield strength Rp 0.2 appreciably or considerably reduced.
• Such stability annealing at such temperatures ie, for example, a temperature of ⁇ 240 ° C. for a time ⁇ 180 min, and in particular ⁇ 60 min, also has the advantage that no distortion of the cast components is formed and heat-treated in a larger batch in a batch furnace can be.
• a particular advantage of using the cast components, for example in motor vehicle construction, is that the cast component in the cast state - ie in the state of least strength (Rp 0.2 about 100 MPa) and maximum ductility (A 5 about 10 to 14%) - mechanically be joined, for example, riveted, can be.
• the subsequent heat treatment which can be carried out for example during the painting or paint firing of the motor vehicle body at, for example, about 180 ° C for a period of about 30 minutes, then the final mechanical values are set.

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• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Metallurgy (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Body Structure For Vehicles (AREA)
• Continuous Casting (AREA)
• Forging (AREA)

Applications Claiming Priority (1)

Publications (2)

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• 2008
  • 2008-06-24 DE DE102008029864A patent/DE102008029864B4/de active Active
• 2009
  • 2009-06-02 JP JP2009133141A patent/JP2010031360A/ja active Pending
  • 2009-06-11 US US12/483,187 patent/US20090314392A1/en not_active Abandoned
  • 2009-06-23 CA CA002669706A patent/CA2669706A1/fr not_active Abandoned
  • 2009-06-24 EP EP09163549A patent/EP2138593A3/fr not_active Withdrawn

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