US 11,739,399 B2
Method for manufacturing aluminum casting, and aluminum casting manufactured thereby
Sang-il Yoon, Seosan-si (KR); Dong-hyun Kim, Seosan-si (KR); Ki-sun Kim, Seosan-si (KR); and Tae-young Kim, Seosan-si (KR)
Assigned to SAMKEE AUTOMOTIVE CO., LTD, Pyeongtaek-si (KR)
Filed by SAMKEE AUTOMOTIVE CO., LTD, Pyeongtaek-si (KR)
Filed on Nov. 8, 2019, as Appl. No. 16/678,561.
Claims priority of application No. 10-2019-0125444 (KR), filed on Oct. 10, 2019.
Prior Publication US 2021/0108291 A1, Apr. 15, 2021
Int. Cl. C22C 21/02 (2006.01); B22D 17/02 (2006.01); B22D 21/00 (2006.01)
CPC C22C 21/02 (2013.01) [B22D 17/02 (2013.01); B22D 21/007 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An aluminum casting comprising:
an aluminum alloy including Si in an amount of 9.6-12.0 wt %, Cu in an amount of 1.5-3.5 wt %, Mg in an amount of 0.1-0.3 wt %, Zn in an amount of 0.5-1 wt %, Fe in an amount of 1-1.3 wt %, Mn in an amount of 0.1-0.5 wt %, Ti in an amount of 0.02-0.3 wt %, B in an amount of 0.01-0.04 wt %, Sr in an amount of 0.01-0.03 wt %, a remainder Al, and unavoidable impurities,
wherein the aluminum casting has a microstructure including primary crystal alpha-aluminum and a eutectic structure,
wherein a percentage of the number of grains each having an area of 5-100 μm2 in the microstructure is greater than or equal to 85% of the number of grains observed in the entire microstructure, and
wherein the eutectic structure is formed of eutectic silicon and is a mixture of particulate structure and fibrous structure, the mixture including at least 5% particulate structure exhibiting a ratio of longest to shortest part of 3 or less.