AbstrakIndonesia menjadi salah satu negara dengan konsumsi aluminium terbesar, salah satunya untuk komponen bogie tank baja. Upaya pembuatan roda bogie wheel telah dilakukan dengan berbagai metode, salah satunya adalah proses pengecoran. Untuk memenuhi spesifikasi teknis tersebut, bogie hasil pengecoran harus dikenai proses heat treatment agar memiliki sifat mekanik yang memadai. Dalam penelitian ini dilakukan variasi waktu holding proses artificial aging selama 2, 3, 4, dan 5 jam. Pengujian yang dilakukan berupa uji metalografi, pengujian tarik, dan pengujian impak. Hasil dari pengujian, didapatkan bahwa kekuatan tertinggi adalah sebesar 193,08 MPa yang dicapai oleh spesimen aluminium dengan waktu holding proses artificial aging selama 5 jam. Ketahanan impak tertinggi adalah sebesar 2,55 Joule yang dicapai oleh spesimen aluminium dengan waktu holding proses artificial aging selama 5 jam. Presipitat yang terbentuk pada hasil artificial aging berupa presipitat AlSi yang halus, membulat dan membentuk kluster. AbstractIndonesia is one of the countries with the largest aluminum consumption, particularly for bogie tracklink tank components. The efforts to make bogie wheel wheels have been carried out with various methods, including the casting process. There are some technical specifications to support bogie on its application, bogies from casting must be subjected to a heat treatment process in order to have adequate mechanical properties. In this research, the variation of holding time of the artificial aging process was 2, 3, 4, and 5 hours. Tests carried out in the form of metallographic, tensile strength testing, and impact testing. It was found that the highest strength was 193.08 MPa which was achieved by aluminum specimen with holding time for the artificial aging process for 5 hours. The highest impact resistance is 2.55 Joules which is achieved by aluminum specimens with a holding time of the artificial aging process for 5 hours. Precipitates that are formed on the results of artificial aging are AlSi precipitates with smooth, rounded and clustered shape.
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