Truman, Denby (2022) Analisis Pengaruh Holding Time Dan Media Pendingin Up-Quenching Pada CU-16,8ZN-6,99AL Alloy Terhadap Struktur Mikro Dan Kekerasan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Logam dapat mendapatkan sifat mekanik lebih baik dengan cara menggabungkan beberapa material logam, dapat disebut paduan. Salah satu contoh paduan yang sedang dikembangkan adalah paduan Cu-Zn-Al karena dapat dilakukan cold working, kemudahan fabrikasi, dan biaya produksi yang rendah. Paduan Cu-16,8Zn-6,99Al dibuat dengan proses pengecoran yang kemudian dilakukan perlakuan panas homogenizing, annealing, dan solution treatment. Proses quenching yang dilakukan setelah solution treatment menggunakan metode up�quenching dengan variasi holding time 10,20, dan 30 menit menggunakan media pendingin air dan oli. Penelitian ini bertujuan untuk menganalisis pengaruh variasi holding time dan media pendingin up-quenching pada paduan Cu-15,9Zn-6,89Al terhadap struktur mikro dan kekerasan. Struktur mikro yang terbentuk pada seluruh spesimen adalah α, β, dan γ. Ukuran butir terbesar adalah 160,76 μm pada spesimen UQW30 dan ukuran butir terkecil adalah 112,485 μm pada spesimen UQO10. Hal tersebut terjadi dikarenakan semakin lama holding time up-quenching maka pertumbuhan ukuran butir pada spesimen akan semakin besar. Ukuran butir yang semakin besar akan membuat nilai kekerasan dari spesimen akan semakin menurun. Nilai kekerasan tertinggi adalah 280,33 ± 2,517 HVN pada spesimen UQO10 dan nilai kekerasan terkecil adalah 255 ± 1 HVN pada spesimen UQW30. Pada spesimen up-quenching dengan media oli memiliki kekerasan yang lebih tinggi dibandingkan dengan spesimen media air. Karena fasa α pada media oli lebih sedikit dibandingkan media air, dimana fasa α pada paduan Cu-Zn-Al memiliki sifat ulet, sehingga dapat menurunkan kekerasan. Hal ini membuat spesimen UQO10 memiliki kekerasan yang lebih tinggi jika dibandingkan dengan spesimen UQW30
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Metals can get better mechanical properties by combining several metal materials, which can be called alloys. An example of an alloy being developed is the Cu-Zn-Al alloy because it can be cold worked, easy to fabricate, and has low production costs. The Cu-16.8Zn�6.99Al alloy is made by a casting process, which is heat treatment by homogenizing, annealing, and solution treatment. The quenching process, carried out after solution treatment, used the up-quenching method with variations in holding times of 10, 20, and 30 minutes using water and oil cooling media. This study aims to analyze the effect of holding time and cooling media up-quenching in Cu-16,8Zn-6,99Al alloy on the microstructure and hardness. The microstructures formed in all specimens were α, β, and γ. The largest grain size was 160.76 μm in the UQW30 specimen, and the smallest grain size was 112.485 μm in the UQO10 specimen. hange of grain size happens because the longer the holding time up-quenching, the more significant the grain size growth in the specimen. The change in the grain size affects the hardness value of the specimen. The larger the grain size, the lower the hardness. The highest hardness value is 280.33 ± 2.517 HVN in the UQO10 specimen, and the smallest hardness value is 255 ± 1 HVN in the UQW30 specimen. The up-quenching specimen with oil media has a higher hardness than the water medium specimen. Because the α phase in the oil medium is less than the water medium, where the phase α in the Cu-Zn-Al alloy has ductile properties, it can reduce the hardness. The less α Phase makes UQO10 specimens have a higher hardness when compared to UQW30 specimens.
Item Type: | Thesis (Other) |
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Additional Information: | RSMt 669.3 Tru a-1 2022 |
Uncontrolled Keywords: | Up-Quenching, Cu-Zn-Al, Media Pendingin, Solution Treatment, Kekerasan, Up-Quenching, Cu-Zn-Al, Cooling Media, Solution Treatment, Hardness |
Subjects: | T Technology > TN Mining engineering. Metallurgy > TN775 Aluminum alloys--Metallurgy. |
Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
Depositing User: | Mr. Marsudiyana - |
Date Deposited: | 10 Feb 2025 07:43 |
Last Modified: | 10 Feb 2025 07:43 |
URI: | http://repository.its.ac.id/id/eprint/118599 |
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