US 12,276,009 B2
Process for low-cost tempering of aluminum casting
Randolf Scott Beals, Grand Ledge, MI (US)
Assigned to MAGNA INTERNATIONAL INC., Aurora (CA)
Filed by MAGNA INTERNATIONAL INC., Aurora (CA)
Filed on Apr. 4, 2022, as Appl. No. 17/712,526.
Application 17/712,526 is a division of application No. 16/487,877, abandoned, previously published as PCT/US2018/019432, filed on Feb. 23, 2018.
Claims priority of provisional application 62/462,598, filed on Feb. 23, 2017.
Prior Publication US 2022/0228242 A1, Jul. 21, 2022
Int. Cl. B22D 7/00 (2006.01); B22D 11/00 (2006.01); B22D 31/00 (2006.01); C22C 21/02 (2006.01); C25D 5/44 (2006.01); C25D 5/50 (2006.01); C25D 9/02 (2006.01)
CPC C22C 21/02 (2013.01) [B22D 7/00 (2013.01); B22D 11/003 (2013.01); B22D 31/00 (2013.01); C25D 5/44 (2013.01); C25D 5/50 (2013.01); C25D 9/02 (2013.01)] 17 Claims
 
1. A method of manufacturing a cast aluminum alloy, comprising the steps of:
casting an aluminum alloy, the aluminum alloy including silicon in an amount of 4.0 to 9.0 weight percent (wt. %), copper in an amount up to 0.10 wt. %, iron in an amount up to 0.25 wt. %, manganese in an amount of 0.3 to 0.60 wt. %, magnesium in an amount of 0.10 to 0.60 wt. %, titanium in an amount up to 0.15 wt. %, strontium in an amount of 0.01 to 0.6 wt. %, and a balance of aluminum, except for possible incidental elements and/or impurities, based on the total weight of the aluminum alloy;
applying a coating to the cast aluminum alloy;
heating the coated cast aluminum alloy;
wherein the cast aluminum alloy has an F temper designation before the heating step and the cast aluminum alloy has a T85 temper designation after the heating step, and
wherein the cast aluminum alloy has a yield strength (YS) ranging from 90 to 200 MPa, an ultimate tensile strength (UTS) ranging from 220 to 300 MPa; and an elongation percentage (%) of 7.0% to 19% prior to the heating of the cast aluminum alloy when tested according to an ASTM E8 specification; and the cast aluminum alloy has a yield strength (YS) ranging from 100 to 220 MPa, an ultimate tensile strength (UTS) ranging from 230 to 320; and an elongation percentage (%) of 6.0% to 15% after the heating of the cast aluminum alloy, wherein the heating step includes curing the coating on the cast aluminum alloy.