Analisis Pengaruh Variasi Holding Time Up-Quenching Dan Artificial Aging Pada Cu-16,8Zn-6,99Al Alloy Terhadap Struktur Mikro Dan Kekerasan

Alifandi, Riza Muhammad (2022) Analisis Pengaruh Variasi Holding Time Up-Quenching Dan Artificial Aging Pada Cu-16,8Zn-6,99Al Alloy Terhadap Struktur Mikro Dan Kekerasan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Material paduan yang terus mengalami perkembangan adalah paduan Cu-Zn-Al karena dianggap sebagai jenis material pintar yang umumnya disebut shape memory alloys. Penelitian ini bertujuan untuk menganalisi variasi holding time up-quenching solution treatment dan proses artificial aging paduan Cu-16,8Zn-6,99Al terhadap struktur mikro dan kekerasannya. Paduan Cu-16,8Zn-6,99Al dalam penelitian ini diperoleh melalui proses pengecoran yang kemudian diberikan perlakuan panas homogenizing, annealing, solution treatment dengan up-quenching variasi holding time 15 menit, 20 menit, dan 25 menit dengan media pendingin oli pada temperatur 100 ˚C dan artificial aging pada temperatur 200˚C dengan holding time selama 2 jam. Dari hasil pengujian, struktur mikro yang terbentuk adalah α, β, dan γ tanpa adanya fasa β’ atau martensit yang ditemukan pada keseluruhan spesimen solution treatment dan artificial aging. Tidak terbentuknya β’atau martensit pada spesimen dikarenakan temperatur transformasi martensite start di bawah 0˚C. Nilai kekerasan tertinggi pada spesimen solution treatment terdapat pada spesimen UQ15 sebesar 280,67 ± 0,57 VHN dengan ukuran butir sebesar 121,152 μm. Besar butir yang dihasilkan juga memiliki ukuran yang berbeda-beda antar spesimen. Semakin lama waktu tahan pada proses solution treatment semakin besar pula ukuran butir yang akan dihasilkan. Seiring meningkatnya ukuran butir akan mengurangi nilai kekerasan. Nilai kekerasan terkecil pada spesimen solution treatment terdapat pada spesimen UQ25 sebesar 266 ± 1 VHN dengan ukuran butir sebesar 140,493 μm. Untuk nilai kekerasan tertinggi dimiliki oleh spesimen artificial aging terdapat pada spesimen UQ15A sebesar 305,67 ± 0,57 VHN. Adanya proses artificial aging berakibat pada terbentuknya presipitat γ pada paduan Cu-16,8Zn-6,99Al. Presipitat inilah yang membuat kekerasan paduan semakin meningkat selaras dengan bertambahnya temperatur artificial aging.
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The material alloy that continues to develop is Cu-Zn-Al alloy, considered a type of smart material called shape memory alloy. This study aims to analyze the variation in holding time up-quenching solution treatment and artificial aging process of Cu-16,8Zn-6,99Al alloy on microstructure and hardness. The Cu-16,8Zn-6,99Al alloy in this study was made by casting method and heat treated by homogenizing, annealing, solution treatment with up-quenching variations of holding time about 15 minutes, 20 minutes, and 25 minutes on the oil-bath cooling media at 100˚C and artificial aging process at 200˚C for 2 hours. From the test results, the microstructures formed are α, β, and γ for solution treatment and artificial aging specimens. The β’ martensite phase does not appear because the theoretical martensite start temperatur is below 0˚C. The highest hardness value in the solution treatment specimen was found in UQ15 specimen, with the hardness and grain size value about 280,67 ± 0,57 VHN and 121,152 μm. The grain size value also has some different value from another specimen. The grain size change is because the longer the holding time applied in the solution treatment process, the larger grain size will be produced. As the grain size increases, the hardness value will decrease. The smallest hardness value in solution treatment specimen was found in UQ25, with the hardness and grain size value about 266 ± 1 VHN and 140,493 μm. The highest hardness value in the artificial aging specimen was found in UQ15A specimen, with the hardness value about 305,67 ± 0,57 VHN. The existence of an artificial aging process causes γ precipitates in the Cu-16,8Zn-6,99Al alloy. These precipitates make the hardness value increase with increasing artificial aging temperature.

Item Type:	Thesis (Other)
Additional Information:	RSMt 620.165 Ali a-1 2022
Uncontrolled Keywords:	Cu-Zn-Al, Solution Treatment, Up-Quenching, Artificial Aging, Struktur Mikro, Kekerasan, Microstructure, Hardness.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	16 Dec 2024 02:58
Last Modified:	16 Dec 2024 03:03
URI:	http://repository.its.ac.id/id/eprint/115975

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