Cast aluminum alloy excellent in relaxation resistance property and method of heat-treating the same
Inactive Publication Date: 2008-01-03
TOYOTA CENT RES & DEV LAB INC
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[0023]The cast aluminum alloy of the present invention is a cast aluminum alloy having the aforementioned specified composition, and having a hypoeutectic structure of Al and Si free from primary crystal Si. And, as described later, for example, by performing solution heating and water quenching after casting and, further, performing specified-time aging treatment at the specified temperature, its average hardness is adjusted to be HV130 to HV160. Thereby, a cast aluminum alloy more excellent in the relaxation resistance property than previously can be obtained.
[0035]By having the specified composition mentioned above, the cast aluminum alloy of the second aspect of the present invention has a hypoeutectic structure free from primary crystal Si composed of an isotropic homogeneous structure in which there is substantially no alignment of dendrites as described above, and a eutectic region is present in a network manner. And, as described later, for example, by performing solution heating and water quenching after casting and, further, performing specified-time aging treatment at specified temperature, its average hardness is adjusted to be HV130 to HV160. Thereby, a cast aluminum alloy further excellent in the relaxation resistant property than previously can be obtained.
[0048]The heat-treatment method of the third aspect of the present invention is a heat-treatment method for obtaining the aforementioned cast aluminum alloy of the first aspect of the present invention and, by implementing this, the aforementioned cast aluminum alloy excellent in the relaxation resistance property can be obtained.
[0062]The heat-treatment method of the fourth present invention is a heat-treatment method for obtaining the aforementioned cast aluminum alloy of the second aspect of the present invention and, by implementing this, the aforementioned cast aluminum alloy further excellent in the relaxation resistance property can be obtained.
Problems solved by technology
However, since Ni is expensive, there is a strong need not to use Ni, if possible.
Method used
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[0147]Cast aluminum alloys related to Examples of the present invention will be explained.
[0148]In present Examples, various cast aluminum alloys (Examples 1 to 9, Comparative Examples 1 to 10) shown in Table 1 to Table 3 were manufactured, and properties thereof were assessed.
[0149]A group shown in Table 1 is an example concerning the first aspect of the present invention, a group shown in Table 2 is an example concerning the second aspect of the present invention, and a group shown in Table 3 is an example concerning the second aspect of the present invention in which essential compositions are increased on the assumption that a recycled metal is utilized.
[0150]Aluminum alloys having chemical compositions shown in Table 1 to Table 3 were prepared by melting. In any case, a molten metal in which compositions were adjusted was prepared, a flux was added to the molten metal at 740 to 760° C. to perform deoxidation, this was subjected to degassing treatment with hexachloroethane and A...
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Abstract
A cast aluminum alloy excellent in the relaxation resistance property, comprising 9 to 17% by mass of Si, 3 to 6% by mass of Cu, 0.2 to 1.2% by mass of Mg, 0.2 to 1.5% by mass of Fe, 0.1 to 1% by mass of Mn, a balance consists of Al and unavoidable impurities, wherein a Ni content is not more than 0.5% by mass. The average hardness is adjusted to HV130 to HV160 by performing, after casting, solution heating by retaining the alloy at a treatment temperature of 450 to 510° C. for 0.5 hour or longer, performing water quenching and, thereafter, performing aging treatment by retaining the alloy at a treatment temperature of 170 to 230° C. for 1 to 24 hours.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Application No. 2006-183919, filed Jul. 3, 2006, entitled “CAST ALUMINUM ALLOY EXCELLENT IN RELAXATION RESISTANCE PROPERTY AND METHOD OF HEAT-TREATING THE SAME”. The contents of this application are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a cast aluminum alloy excellent in the relaxation resistance property and a method of heat-treating the same.[0004]2. Background of the Invention[0005]Since a cast aluminum alloy which is an aluminum alloy manufactured by casting has a relatively high strength while it is light, it is utilized in a variety of fields. Meanwhile, it is known that when an aluminum alloy is given a constant strain, and is allowed to stand, stress relaxation phenomenon is generated in which a stress generated by the strain is decreased with time. ...
Claims
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CPCC22C21/04
Inventor IKUNO, HAJIMEYAMADA, AKIRAHOHJO, HIROSHIKAWAHARA, HIROSHIHOTTA, SHOJIUEDA, ISAMU
Owner TOYOTA CENT RES & DEV LAB INC