Effect of cooling media variations on physical properties and hardness of brass (CuZn) casting products using CO2 sand mold.

The metal will experience a phase change during the casting process, both changes in physical and mechanical properties caused by the freezing process. Changes in these properties are influenced, among others, by the cooling medium used during the cooling process. Because the physical and mechanical properties of a metal are very important in machinery construction, in this study different cooling media were used, namely: seawater, well water, and SAE 40 oil. The purpose of this study was to determine the effect of different cooling media on seawater, water wells, and SAE 40 oil on the chemical composition of brass cast products, hardness, and microstructure of brass castings. From the hardness test, the test object with seawater media has a better hardness value than well water and SAE 40 oil. From the results of testing the chemical composition, there are 18 elements, but only 4 elements have the most influence on cast brass, namely: Cu, Zn, Fe, and Sn are the most dominant. Judging from the elements present in this material, it can be classified as brass, and zinc alloy (Cu-Zn). [ABSTRACT FROM AUTHOR]