Method of producing a high strength balanced Al-Mg-Si alloy...

Details Method of producing a high strength balanced Al-Mg-Si alloy... Method of producing a high strength balanced Al-Mg-Si alloy...

2006-02-07

2006-02-07

Wyszomierski, George (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

C148S693000, C148S694000, C148S700000

Reexamination Certificate

active

06994760

ABSTRACT:
The present invention relates to a method for producing high strength balanced Al—Mg—Si alloy with an improved fatigue crack growth resistance and a low amount of intermetallics, comprising the steps ofa) casting an ingot with the following composition (in weight percent) Si: 0.75–1.3, Cu: 0.6–1.1, Mn: 0.2–0.8, Mg: 0.45–0.95, Fe: 0.01–0.3, Zr: <0.25, Cr: <0.25, Zn: <0.35, Ti: <0.25, impurities each less than 0.05 and less than 0.20 in total, balance aluminum,b) optional homogenization of the cast ingot,c) pre-heating the ingot after casting for 4 to 30 hours with temperatures above 520° C.,d) hot working the ingot and optionally cold working,e) solution heat treating, andf) quenching the worked product.The pre-heating is preferably performed for 6 to 18 hours with temperatures between 530° C. and 560° C. The alloy has a fatigue crack growth rate at ΔK=20 MPa√m of below 9.0E−04 and at ΔK=40 MPa√m of below 9.0E−03, wherein the amount of intermetallics within the finally worked alloy product, according to the measured specific energy Delta H associated with the DSC signal, is below 1.5 J/g.

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