STUDI KASUS PENGARUH TEMPERATUR REMELTING PISTON MOTOR BEKAS TERHADAP KEKUATAN TARIK, KEKERASAN, STRUKTUR MIKRO, DAN UJI KOMPOSISI

FADLI KHOLILULOH, IRVAN (2022) STUDI KASUS PENGARUH TEMPERATUR REMELTING PISTON MOTOR BEKAS TERHADAP KEKUATAN TARIK, KEKERASAN, STRUKTUR MIKRO, DAN UJI KOMPOSISI. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The use of aluminum in the automotive industry has continued to increase since 1980 especially aluminum alloys used for the manufacture of cylinder heads, pistons, valves, and engine blocks. The use of scrap metal as industrial raw materials is increasing so that it becomes a trading commodity and encourages the development of scrap metal or scrap metal storage businesses around the business location. This study aims to investigate the value of tensile strength, hardness, microstructure, and chemical composition of the effects of variations in the remelting temperature of the pistons of used Kawasaki Ninja motorcycles using the sand-casting method. The specimens and tensile testing procedures refer to the ASTM E8/E8M-09 standard. The result of this study indicated that the higher the temperature pour, the value of the tensile strength of the castings also increased. The highest tensile strength value was obtained at a casting temperature of 850℃ (specimen C) in 87,74 MPa, while the lowest tensile strength value was found at a casting temperature variation of 750℃ (specimen A) in 61,27 MPa. The highest Vickers hardness value was found at a casting temperature of 850℃ in 105,49 VHN, while the lowest Vickers hardness value was found at the casting temperature variation of 750℃ in 91,22 VHN. It could be observed that the particle structure becomes denser and finer as the pouring temperature increases. The results of the chemical composition test carried out showed an increase and decrease in the chemical elements contained in the casting material. This could be caused by the effects of the pouring speed, the together process of disassembling the mold carried out, and the different moisture content of the sand mold.

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