CN103889746A

CN103889746A - Cast part

Info

Publication number: CN103889746A
Application number: CN201280049889.1A
Authority: CN
Inventors: 卢茨·沃尔肯施泰因; 克劳斯·格雷文
Original assignee: KSM Castings GmbH
Current assignee: KSM Castings Group GmbH
Priority date: 2011-10-11
Filing date: 2012-09-14
Publication date: 2014-06-25
Anticipated expiration: 2032-09-14
Also published as: WO2013053354A3; DE112012004236A5; WO2013053354A2; DE102012108590A1; US20140251508A1; EP2766205A2; CN103889746B

Abstract

The invention relates to a cast part.

Description

Foundry goods

Technical field

The present invention relates to a kind of foundry goods of particularly applying as chassis.

Background technology

Conventionally adopt hypoeutectic, to there is 7-12 % by weight Si content Al alloy for chassis application.In gravity cast-in chills, conventionally adopt alloy A lSi11Mg, in low-pressure chill casting, conventionally adopt alloy A lSi7Mg.Known to the few AlSiMg alloy of Si by WO2007/025528A2 and WO/2009/059593, the mechanical characteristics that this alloy phase has clear improvement for above-mentioned general AlSi casting alloy tool.

Summary of the invention

Based on prior art, the object of the invention is to, further improve by the foundry goods forming containing the few Al alloy of Si for the mechanical characteristics of foundry goods.

According to the present invention, realize this object by the foundry goods being formed by Al casting alloy, this casting alloy contains at least five following alloy compositions

Si:2.5 to 3.3, preferred 2.7 to 3.1 % by weight

Mg:0.2 to 0.7, preferred 0.3 to 0.6 % by weight

Fe:< 0.18, preferred 0.05 to 0.16 % by weight

Mn:< 0.5, preferred 0.05 to 0.4 % by weight

Ti:< 0.1, preferred 0.01 to 0.08 % by weight

Sr:< 0.03, preferred 0.01 to 0.03 % by weight

Cr:0.3 to 1.3, preferred 0.4 to 1.0, particularly preferably 0.5 to 0.8 % by weight

Other: < 0.1 % by weight,

And be supplemented to 100 % by weight with Al respectively, its medium casting is processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes, very particularly preferably 30 to 55 minutes and definitely particularly preferably between 30 to 45 minutes carrying out heat aging between 150 to 240 DEG C.

Can be advantageously, foundry goods is processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes, very particularly preferably 30 to 55 minutes and definitely particularly preferably between 30 to 45 minutes carrying out heat aging between 170 to 230 DEG C.

Can be suitable, foundry goods is processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes, very particularly preferably 30 to 55 minutes and definitely particularly preferably between 30 to 45 minutes carrying out heat aging between 200 to 220 DEG C.

Other advantage can be, foundry goods carried out solution annealing 1 to 10 hour, preferably 5 to 9 hours, particularly preferably 6 to 8 hours before heat aging is processed between 490 and 550 DEG C.

Can be advantageously, foundry goods carried out solution annealing 1 to 10 hour, preferably 5 to 9 hours, particularly preferably 6 to 8 hours before heat aging is processed between 530 and 550 DEG C.

Above-mentioned heat treatment causes further improving significantly the mechanical characteristics through cast member or foundry goods.

For chassis application, particularly, for the member of wheel guiding, improve generally mechanical characteristics value.

Can contain the impurity that is subject to restriction of production according to alloy of the present invention, such as Pb, Ni, Zn etc. are general known as those skilled in the art.These impurity belong to other described alloy compositions.

Foundry goods according to the present invention is with respect to the hot-cured foundry goods through traditional or have especially the intensity of improvement without hot-cured foundry goods at all, and also has intensity-stretch ratio ratio of improvement.

As according to the present invention through hot-cured, in particular as the manufacture method of the foundry goods of car chassis parts, it is main that what be suitable for is permanent mo(u)ld casting method.Because workpiece, member or the parts of high request need extraordinary mechanical characteristics, as manufacture method particularly suitable is gravity cast-in chills and low-pressure chill casting.

Particularly by the casting method being stressed, for example low pressure-back pressure casting (CPC method), semisolid casting and other casting methods being stressed are forged the low pressure sand casting process of (Cobapress) or cast molding device automation as high-pressure casting, cast, are obtained good mechanical technology performance by good cast structure.Here particularly preferably be back pressure-cast-in chills method (CPC method).

Except already described advantage, the advantage also having through hot-cured foundry goods according to the present invention is, owing to not existing alloy compositions Cu and Zn to significantly improve the corrosion stability of foundry goods.This foundry goods is also relatively cheap, because do not have to adopt more expensive equally alloy additive, for example SE metal, so can apply common melt process and not need the special consumption separating for circulating.

Detailed description of the invention

Embodiment

In order to detect the mechanical characteristics through hot-cured foundry goods, cast turntable bearing and manufacture tensile test bar by this turntable bearing according to DIN50125:2009-07 by alloy A lSi3Mg0.5Cr0.7 with low pressure-back pressure-cast-in chills method.Then carry out solution annealing 0.5 to 6 hour and carry out equally the heat aging processing of 0.5 to 6 hour at 200-220 DEG C at 545 DEG C.To mechanical characteristics tensile strength R _m, yield limit R _p0.2 and elongation at fracture A5 measure.This is adopted to DIN EN ISO6842-1:2009-12.The value recording is shown in Figure 1 with diagrammatic form.

There is shown, by heat aging is processed below 60 minutes, 30-59 minute particularly carrying out between 200 and 220 DEG C, can see significantly improving of elongation at fracture, the raising of this elongation at fracture is also accompanied by the raising of tensile strength.Here, yield limit has the same high grade of roughly maintenance.

Claims

1. the foundry goods being formed by Al casting alloy, described casting alloy contains at least five following alloy compositions:

Si:2.5 to 3.3, preferred 2.7 to 3.1 % by weight

Mg:0.2 to 0.7, preferred 0.3 to 0.6 % by weight

Fe:< 0.18, preferred 0.05 to 0.16 % by weight

Mn:< 0.5, preferred 0.05 to 0.4 % by weight

Ti:< 0.1, preferred 0.01 to 0.08 % by weight

Sr:< 0.03, preferred 0.01 to 0.03 % by weight

Other: < 0.1 % by weight

And be supplemented to 100 % by weight with Al respectively, wherein said foundry goods carries out heat aging between 150 to 240 DEG C to be processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes and very particularly preferably 30 to 55 minutes.

2. foundry goods according to claim 1, is characterized in that, described foundry goods carries out heat aging between 170 to 230 DEG C to be processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes and very particularly preferably 30 to 55 minutes.

3. foundry goods according to claim 1 and 2, is characterized in that, described foundry goods carries out heat aging between 200 to 220 DEG C to be processed 15 to 120 minutes, preferably 15 to 60 minutes, particularly preferably 20 to 55 minutes and very particularly preferably 30 to 55 minutes.

4. according to the foundry goods described in any one in claims 1 to 3, it is characterized in that, described foundry goods carries out solution annealing 1 to 10 hour, preferably 5 to 9 hours, particularly preferably 6 to 8 hours between 490 and 550 DEG C.

5. according to the foundry goods described in any one in claim 1 to 4, it is characterized in that, described foundry goods carries out solution annealing 1 to 10 hour, preferably 5 to 9 hours, particularly preferably 6 to 8 hours between 530 and 550 DEG C.

6. according to the purposes of the foundry goods described in any one in the claims, described foundry goods is as member or the parts of car floor parts.