Part cast from aluminium alloy with high hot strength

Details Part cast from aluminium alloy with high hot strength Part cast from aluminium alloy with high hot strength

C - Chemistry, Metallurgy

22

C

C22C 21/02 (2006.01) F02F 1/00 (2006.01)

Patent

CA 2489349

The invention relates to a cast part with high creep strength, such as a cylinder head or a crankcase, which is made from alloy having the following composition (wt.-%): Si: 5-11 and preferably 6.5-7.5; Fe < 0.6 and preferably < 0.3; Mg: 0.15-0.6 and preferably 0.25-0.5; Cu: 0.3-1.5 and preferably 0.4-0.7; Ti: 0.05-0.25 and preferably 0.08-0.2; Zr: 0.05-0.25 and preferably 0.12-0.18; Mn < 0.4 and preferably 0.1-0.3; Zn < 0.3 and preferably < 0.1; Ni < 0.4 and preferably < 0.1; and other elements < 0.10 each and 0.3 in total, with the remainder being aluminium. The inventive part preferably undergoes solution treatment, quenching and tempering, T6 or T7.

L~objet de l~invention est une pièce moulée à haute résistance au fluage, notamment une culasse ou un carter de moteur, en alliage de composition (% en poids) : Si : 5-11 et de préférence 6,5-7,5 Fe < 0,6 et de préférence < 0,3 Mg : 0,15-0,6 « « 0,25-0,5 Cu : 0,3-1,5 « « 0,4-0,7 Ti : 0,05-0,25 « « 0,08-0,20 Zr : 0,05-0,25 0,12-0,18 Mn < 0,4 « « 0,1-0,3 Zn < 0,3 « « < 0,1 Ni < 0,4 « « < 0,1 autres éléments < 0,10 chacun et 0,30 au total, reste aluminium. La pièce est, de préférence, traitée par mise en solution, trempe et revenu à l~état T6 ou T7.

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