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US 6,368,427 B1Granted
Method for grain refinement of high strength aluminum casting alloys
OwnerGeoffrey K. Sigworthinventor
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OwnerGeoffrey K. Sigworthinventor
Estimating the term…
A method of casting an aluminum base alloy to provide a cast product having improved hot crack resistance in the as-cast condition, the method comprising providing a melt of an aluminum base alloy comprised of 4 to less than 5 wt. % Cu, max. 0.1 wt. % Mn, 0.15 to 0.55 wt. % Mg, max. 0.4 wt. % Si, max. 0.2 wt. % Zn, up to 0.4 wt. % Fe, the balance comprised of aluminum, incidental elements and impurities. The dissolved Ti in the melt is maintained in the range of about 0.005 to 0.05 wt. % to improve the resistance of the alloy to hot cracking. A nucleating agent selected from the group consisting of metal carbides, aluminides and borides is added to the melt to provide an undissolved nucleating agent therein, in the range of 0.002 to 0.1 wt. % for grain refining. The alloy is solidified to provide a cast product having a grain size of less than 125 microns and free of hot cracks.
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A method of casting an aluminum base alloy to provide a cast product having hot crack resistance in the as-cast condition, the method comprising:
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 4 to less than 5 wt. % Cu, max. 0.1 wt. % Mn, 0.15 to 0.55 wt. % Mg, max. 0.4 wt. % Si, max. 0.2 wt. % Zn, up to 0.4 wt. % Fe, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 4 to less than 5.2 wt. % Cu, 0.15 to 0.6 wt. % Mn, 0.15 wt. % to 0.6 wt. % Mg, max. 0.15 wt. % Si, max. 0.2 wt. % Zn, up to 0.2 wt. % Fe, 0.4 to 1 wt. % Ag, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 3.8 to less than 4.6 wt. % Cu, 0.25 to 0.5 wt. % Mn, 0.25 to 0.55 wt. % Mg, max. 0.1 wt. % Si, up to 0.15 wt. % Fe, and 2.5 to 3.5 wt. % Zn, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 4.2 to less than 5 wt. % Cu, 0.2 to 0.5 wt. % Mn, 0.15 to 0.55 wt. % Mg, max. 0.15 wt. % Si, up to 0.2 wt. % Fe, and max. 0.2 wt. % Zn, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 4.5 to less than 6.5 wt. % Zn, 0.2 to 0.8 wt. % Mg, max. 0.8% Fe, max. 0.4 wt. % Mn, max. 0.3 wt. % Si, max. 0.5 wt. % Cu, 0.15 to 0.6 wt. % Cr, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 6 to less than 7.5 wt. % Zn, 0.6 to 1 wt. % Mg, max. 0.15% Fe, max. 0.10 wt. % Mn, max. 0.15 wt. % Si, max. 0.1 wt. % Cu, 0.06 to 0.4 wt. % Cr, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 2.7 to less than 4.5 wt. % Zn, 1.4 to less than 2.4 wt. % Mg, max. 1.7% Fe, max. 0.6 wt. % Mn, max. 0.3 wt. % Si, max. 0.4 wt. % Cu, optionally 0.2 to 0.4 wt. % Cr, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
A vehicular or aerospace casting having resistance to hot cracking, the casting formed from an aluminum alloy comprised of 4.5 to less than 7 wt. % Zn, 0.25 to less than 0.8 wt. % Mg, max. 1.4% Fe, max. 0.5 wt. % Mn, max. 0.3 wt. % Si, 0.2 to less than 0.65 wt. % Cu, from 0.005 to less than 0.05% dissolved Ti, and 0.003 to 0.06 wt. % Ti in the form of an undissolved nucleating agent for grain refining, the balance comprised of aluminum, incidental elements and impurities, the casting having a grain size of less than 125 microns.
Dependencies are inferred from the claim text.