Fajri, Ahmad Rizki (2021) Analisis Perlakuan Artificial Aging Dengan Variasi Temperatur Dan Waktu Tahan Terhadap Kekerasan Dan Struktur Mikro Aluminium 336 Sebagai Aplikasi Piston Mahle M124. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pengembangan komponen piston menggunakan paduan aluminium merupakan inovasi di bidang otomotif. Namun untuk mencapai sifat mekanik yang sesuai, perlu dilakukan artificial aging. Perlakuan panas ini dipengaruhi oleh temperatur dan waktu tahan. Waktu tahan yang terlalu lama atau temperatur aging yang terlalu tinggi berdampak pada penurunan nilai kekerasan (overaged). Penelitian ini bertujuan untuk menganalisis pengaruh artificial aging pada perubahan kekerasan dan struktur mikro paduan aluminium 336. Setelah dilakukan pengecoran paduan aluminium 336 pada temperatur 850oC, lalu solution heat treatment pada temperatur 520oC selama 8 jam, di-quenching dengan media air. Kemudian artificial aging dengan variasi temperatur 130 oC, 170 oC, 210oC dan waktu tahan 24, 27, 30 jam. Lalu dilakukan pengujian kekerasan, metalografi, XRD, dan SEM. Hasil pengujian menunjukkan perlakuan aging pada tiap variasi temperatur aging selama waktu tahan 24, 27, dan 30 jam dapat membentuk presipitat β’-Mg2Si yang semakin inkoheren akibat struktur kristal yang lebih tidak teratur terhadap matriks aluminium dan memengaruhi penurunan nilai kekerasan dengan kekerasan pada temperatur 170oC dan 210oC memenuhi standar kekerasan piston Mahle M124 pada rentang 90 HB - 130 HB.
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The development of piston components using aluminum alloys is an innovation in the automotive field. However, to achieve the appropriate mechanical properties, it is necessary to do heat treatment in the form of artificial aging. This heat treatment is influenced by temperature and holding time. The aging time that is too long or the aging temperature that is too high, will results in decrease in the hardness value (overaged). This study aims to analyze the effect of artificial aging on changes in hardness and microstructure of aluminum 336 alloy. After casting aluminum 336 at temperature of 850oC, the solution was heat-treated at temperature of 520oC for 8 hours followed by quenching with air media. Then artificial aging with temperature variations of 130oC, 170oC, 210oC and variations of holding time 24, 27, 30 hours. Furthermore, hardness, metallographic, XRD, and SEM tests were carried out. The test results show that artificial aging at each aging temperature variation during the holding time of 24, 27, and 30 hours can form more incoherent β'-Mg2Si precipitates due to the more irregular crystal structure to the aluminum matrix and affect the decrease in hardness values with hardness at temperature of 170oC and 210oC fulfilled Mahle M124 piston hardness standard in the range of 90 HB - 130 HB.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Al 336, kekerasan, Mahle M124, overaged, struktur mikro |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing. T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL214 Automobiles--Motors--Pistons and piston rings. T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TS Manufactures > TS205 Metals--Heat treatment. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Ahmad Rizki Fajri |
| Date Deposited: | 12 Aug 2021 11:15 |
| Last Modified: | 12 Aug 2021 11:15 |
| URI: | http://repository.its.ac.id/id/eprint/86147 |
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