Pengaruh Heat Treatment Terhadap Nilai Kekerasan Dan Struktur Mikro Pada Velg (Oem, Lokal, Velg Variasi Buatan Taiwan) Dengan Media Pendinginan Quenching Air

Abstract The purpose of this study was to determine the chemical composition, the effect of artificial aging, and the effect of water-cooling media on the quenching process on the hardness value. The materials used are OEM, Local, and Import wheels which are melted in the kitchen and then printed using a sand mold at 5000 C for 5 minutes. Furthermore, the specimens were quenched in a water-cooling medium at 1800 C for 4 hours. The tools used are Metal Scan Spectrometer, Olympus Metallurgical Microscope with ASTM E 3 standard, and Brinell hardness testing with ASTM E 10 standard. The results gained from the chemical composition of the raw material contained Al on the wheels are respectively (93.59%, 92.15%, and 93.18%). The content of the SI elements on the wheels respectively (6.09%, 3.65%, and 6.47%). The elements content of the Mg on the wheels are respectively (0.0681%, 0.0507%, and 0.0623%). The results of the Brinell hardness test for OEM raw material wheels are HB85.4 kgf / mm, the results of quenching of water media HB = 48.76 kgf / mm, and the results of artificial aging media for water HB = 55.69 kgf / mm. Keyword: Velg, Artifial Aging, Quenchin