Pradana, Soni Aji (2016) Pengaruh Penambahan Chill Dan Ketebalan Cope Cetakan Pasir Terhadap Terbentuknya Butir Kolumnar Dan Sifat Kekerasan Pada Proses Pegecoran Paduan Cu-Zn. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Paduan tembaga-seng atau dikenal dengan kuningan memiliki sifat
mampu cor yang baik. Penelitian ini menggunakan paduan Cu-
17Zn (red brass). Paduan ini banyak digunakan sebagai material
dalam membuat pipa air tanpa sambungan (red brass seamless
pipe). Secara umum terdapat tiga daerah struktur butir yang
terbentuk dari hasil pengecoran, chill zone, columnar zone, dan
equi-axed zone. Terbentuknya ketiga zona tersebut disebabkan
oleh komposisi dan laju pendinginan selama proses pembekuan.
Penelitian ini memvariasikan ketebalan cope cetakan dari 3 cm, 5
cm, 7 cm, dan 9 cm. Setiap cetakan divariasiakn menjadi 2 jenis,
cetakan dengan menggunakan chill dan cetakan tanpa chill. Butir
kolumnar yang terbentuk dianalisa dengan menggunakan
mikroskop optik (metalografi), X-Ray Diffraction, Optical
Emission Spectroscopy, dan melalui pengujian kekerasan. Studi
ini menunjukan adanya penambahan chill pada cetakan pasir
akan meningkatkan butir kolumnar yang terbentuk.
Sedangkan perbedaan ketebalan cope cetakan pasir tidak
memberikan pengaruh terhadap terbentuknya butir kolumnar.
Cope 7 cm dengan chill menghasilkan paduan Cu-Zn dengan
nilai kekerasan tertinggi sebesar 66.76 BHN. ========== Copper-zinc alloy or brass is alloy that has good formability. This
study using Cu-17Zn (red brass). This alloy is widely used as water
pipes (red brass seamless pipe). There are three regions of the grain
structure formed on the metal casting, chill zone, columnar zone,
and equi-axed zone. The formation of the three zones are caused
by the composition and the cooling rate during the freezing
process. This study varying the cope thickness of 3 cm, 5 cm, 7 cm
and 9 cm. Each thick of mold varying into two types, using and
without the chill. Columnar grains were formed and analyzed using
optical microscopy (metallographic), X-Ray Diffraction, Optical
Emission Spectroscopy, and through hardness testing. This study
shows the adding of chill will increase the columnar grains were
formed. While the difference in the thickness of the cope sand mold
does not give effect to the formation of columnar grains. Cu-Zn
alloy produce by 7 cm cope sand mold with adding chill give the
highest hardness value of 66.76 BHN.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.186 Pra p 3100016066385 |
| Uncontrolled Keywords: | Paduan Cu-17Zn, Kolumnar, Ketebalan Cope, Chill, Cu-17Zn, Columnar, Cope Thickness |
| Subjects: | T Technology > TP Chemical technology > TP1151 Special molding and casting processes |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 18 Nov 2019 02:46 |
| Last Modified: | 18 Nov 2019 02:46 |
| URI: | http://repository.its.ac.id/id/eprint/71716 |
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