STUDI EKSPERIMENTAL PENGARUH VARIASI HOLDING TIME DAN TEMPERATUR AGING PADA PERLAKUAN PANAS PRECIPITATION HARDENING T6 TERHADAP SIFAT MEKANIK PADUAN ALUMINIUM ADC 12

MAZDA, BILLYDIAZ TAURA (2016) STUDI EKSPERIMENTAL PENGARUH VARIASI HOLDING TIME DAN TEMPERATUR AGING PADA PERLAKUAN PANAS PRECIPITATION HARDENING T6 TERHADAP SIFAT MEKANIK PADUAN ALUMINIUM ADC 12. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aluminium alloy merupakan material yang paling banyak digunakan sebagai bahan industri dan otomotif. Salah satu jenis aluminium alloy sendiri yang sering digunakan yaitu ADC 12. ADC 12 digunakan untuk material pembuatan part otomotif berupa piston.Untuk mendapatkan sifat mekanik yang diharapkan ADC 12 sendiri memerlukan proses perlakuan panas precipitation hardening T6 yang didalamnya terdapat 2 proses yaitu solution treatment dan aging Pada proses perlakuan panas precipitation hardening, mula-mula material mengalami proses solution treatment yaitu dipanaskan hingga mencapai temperatur 550˚C dan ditahan selama 180 menit, lalu di quenching pada media air bertemperatur 60˚C dan dilanjutkan proses aging berupa pemanasan kembali dengan variasi temperatur 140˚C, 170˚C, 200˚C dan holding time 2, 4, 6, 8 jam. Analisa yang dilakukan pada sifat mekanik dan struktur mikro. Hasil pengujian menunjukkan bahwa temperatur dan holding time saat aging pada precipitation hardening T6 sangatlah berpengaruh terhadap struktur mikro dan sifat mekanik. Struktur mikro yang nampak jelas perbedaannya adalah ukuran dan pesebaran eutectic silicon di tiap variasi temperatur maupun holding time. Presipitat yang terbentuk sendiri berdasarkan kesetaraan antara ADC 12 dengan aluminium tipe a 384 adalah Al2Cu. Sifat mekanik ADC 12 juga meningkat dibanding dengan as cast. Nilai kekerasan tertinggi pada spesimen 170˚C dengan holding time 4 jam sebesar 108,04 BHN. Nilai tertinggi untuk impact strength tertinggi terdapa pada spesimen 200˚C dengan holding time 8 jam sebesar 0,0306 joule/mm2. "=============================================================================================" Aluminium alloy is one of the most used material in industry and automotive. One of the most used aluminium alloy is ADC 12. ADC 12 is used in the design and making of piston, one of the component in automotive vehicles. To obtain the mechanical properties needed in the piston design, ADC 12 needs to be processed by precipitation hardening heat treatment T6 which includes of two procedures, solution treatment and aging. The first process of precipitation hardening, is the solution treatment process, where the material is heated until a 550°C temperature is reached and held for 180 minutes. The material is then quenched in a 60°C water medium and continued to the aging process, where the material that had been quenched is reheated in a variation of temperature 140°C, 170°C, 200°C and held in a variation of 2, 4, 6, and 8 hours of holding time. The mechanical properties and micro structure resulted in the process with each variations is then analysed. The result of the experiment showed that temperature and holding time during the aging process give a significant effect on the micro structure and mechanical properties of the processed material. Size and the distribution of eutectic silicon seen in the micro structure showed a big difference between each variation of temperature and holding time. Al2Cu is the precipitate that is self – formed as an equality between ADC 12 and A 384 type Aluminium. The mechanical properties of ADC 12 is also enhanced compared to as cast. The highest hardness value of the processed alloy is 108, 04 BHN which is obtained through the process of 170°C temperature and 4 hours holding time. The highest impact strength value is 0,0306 Joule/mm2, which is obtained through the 200°C and 8 hours holding time process.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Perlakuan panas T6, aging, ADC 12, heat treatment T6, aging, ADC 12
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Users 13 not found.
Date Deposited: 04 Jan 2017 08:41
Last Modified: 27 Dec 2018 02:32
URI: http://repository.its.ac.id/id/eprint/1307

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