Nayondra, Alif farrel (2021) Efek Perlakuan Panas T6 pada Paduan Aluminium 336 Aplikasi Piston Mahle M!24 terhadap Sifat Kekerasan dan Struktur Mikro. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Draft Sidang_Alif Farrel Nayondra_02511740000098.pdf - Accepted Version Restricted to Repository staff only until 1 October 2023. Download (6MB) | Request a copy |
Abstract
Piston adalah komponen dengan peran paling penting dalam mesin pembakaran internal yang menanggung kerja kondisi ekstream. Peningkatan sifat mekanik dengan proses perlakuan panas T6 sesuai dengan ASM Vol 2 dilakukan pada paduan aluminium pengecoran. Paduan aluminium pada penelitian ini sesuai dengan tipe aluminium 336. Penelitian ini bertujuan menganalisis perubahan sifat kekerasan dan struktur mikro setelah diberikan perlakuan panas artificial aging dengan variasi temperatur dan waktu tahan. Setelah dilakukan pengecoran aluminium dilanjutkan dengan perlakuan panas T6. Dimulai dengan solution heat treatment dilakukan pada temperatur 520οC selama 8 jam, lalu diquench pada media air hangat. Artificial aging dilakukan pada temperatur 130οC, 170οC, dan 210οC dengan waktu tahan 15, 18, dan 21 jam. Dilanjutkan dengan pengujian kekerasan, metalografi, XRD, dan SEM. Presipitat β’’-Mg2Si yang koheren dengan struktur kristal tersambung pada matriks aluminium, dan transformasinya menjadi β’-Mg2Si yang semi koheren terbentuk saat artificial aging menyebabkan kondisi peak hardness sesuai dengan pengujian yang dilakukan. Transformasi β’’ menjadi β’ mengakibatkan turunnya kekerasan. Pada temperatur aging 210 οC dan semua waktu tahan memenuhi standar piston Mahle dengan rentang 90-130 HB
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Pistons is a components with a crucial role in internal combustion engines which has to withstand extreme working conditions. Improving the mechanical properties by T6 heat treatment process according to ASM Vol 2 was carried out on casting aluminum alloys. The aluminum alloy in this study corresponds to the type of aluminum 336. This study aims to analyze the changes in hardness and microstucture after artificial aging heat treatment with variations in temperature and holding time. T6 heat treatmentis applied subsequent to aluminum casting, its begin by solution heat treatment and artificial aging. Solution heat treatment was carried out at a temperature of 520 οC for 8 hours, then quenched in warm water media. Artificial aging was carried out at various temperature including 130 οC, 170 οC, and 210 οC with holding time 15, 18, and 21hours each. Coherent β’’-Mg2Si precipitate with a crystal structure are connected to the aluminum matrix, and their transformation to semi-coherent β’- Mg2Si is formed during artificial aging affects the peak hardness condition according to the tests carried out. The transformation of β’’ to β’ decrease of hardness value. At aging temperature of 210 οC and each holding times fulfilled Mahle M124 piston standard with range 90-130 HB.
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