Cunika, Aprida Ulya (2016) Pengaruh Short Immersing Time Dan Laju Pendinginan Proses Copperizing Terhadap Perubahan Mikrostruktur Dan Perilaku Tembaga Pada Dead Mild Steel. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada dead mild steel dengan maksimal 0,15%C tidak banyak
memberikan efek penguatan. Dengan penambahan paduan
tembaga dapat mencapai keseimbangan kekuatan dan keuletan
dengan penghalusan butir, solid solution, atau presipitasi Cu.
Penelitian ini bertujuan untuk menganalisis perubahan
mikrostruktur dan perilaku tembaga pada baja AISI 1006
meliputi fase yang terbentuk, komposisi, dan persebaran Cu.
Metode penambahan tembaga yang digunakan dengan
mencelupkan baja ke dalam tembaga cair atau yang disebut
metode copperizing menggunakan prinsip difusi. Spesimen
dipotong dengan dimensi 6x3x0,3cm. Kemudian dilakukan
pemanasan awal pada temperatur 900oC dan proses peleburan
tembaga pada temperatur 1100oC. Dilanjutkan proses pencelupan
spesimen ke tembaga cair dengan waktu immerse 5 dan 7 menit,
dan variasi laju pendinginan menggunakan annealing,
normalizing, dan quenching. Setelah itu dilakukan pengujian
struktur mikro, SEM EDX untuk analisis topografi dan
persebaran Cu, OES untuk mengetahui komposisi kimia, dan
XRD untuk identifikasi fase dan microstrain. Hasil pengujian
menunjukkan semakin lama waktu celup dan laju pendinginan,
semakin banyak kadar Cu yang berdifusi yang menyebabkan luas
ukuran butir mengecil yaitu dengan kadar Cu tertinggi yang
berdifusi sebesar 0.277% pada baja AISI 1006 copperizing 7
menit pendinginan annealing yang menyebabkan luas ukuran
butir mengecil hingga sebesar 11114.6622 μm2. Pada spesimen
dengan pendinginan anil memperlihatkan fase ferit dan pada
pendinginan normal memperlihatkan fase poligonal ferit,
sedangkan pada pendinginan quench memperlihat fase granular
bainit. Pada spesimen copperizing dengan pendinginan normal
dan quench menunjukkan bahwa Cu larut seluruhnya didalam
kristal Fe membentuk solid solution.
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In dead mild steel with a maximum of 0.15%C won’t
contribute many effects to its strengthening. By adding copper as
an alloying element, a balance between strength and ductility
through grain refinement and solid solution, or Cu precipitation
could be obtained. This research aimed to analyze
microstructures changes and copper behavior in AISI 1006
including phases formed, composition, and Cu distribution.
Method of copper addition used in this research was called
copperizing, which is done by immersing steel into molten
copper and taken advantage of diffusion principle. Specimens
were cut into 6x3x0.3cm smaller pieces. Then, preheated the
specimens to 900oC and melting the copper simultaneously at
1100oC in different heat-processing. Next, immersion process of
the specimens into molten copper was done with different
immersion times, which were 5 and 7 minutes. Subsequently, the
specimens were also cooled down in three different ways, which
were annealed, normalized, and quenched. Tests were ready to
be conducted to these specimens. The tests conducted were
microstructural analysis, SEM-EDX test to observe topography
and Cu distribution, OES to determine the chemical composition
of the specimens, and lastly XRD to identify the phases and
microstrain. The results show that the longer the immersion time
and cooling, the higher the Cu diffusion. These results in smaller
grain area with the highest level of Cu successfully diffused in a
specimen were 0.277%. These phenomenons refer to the AISI
1006 copperized for 7 minutes and then annealed which reduce
its grain area up to 11114.6622 μm2. The structural analysis for
the annealed specimens show that they are mainly composed of
ferrites and for the normalized ones, they were composed of
polygonal ferrites and the quenched ones show the presence of
granular bainites. In the normalized-copperized and the
quenched-copperized specimens, it can be seen that Cu was
dissolved into Fe crystals to form a solid solution.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.182 Cun p |
| Uncontrolled Keywords: | Copperizing; waktu immerse; laju pendinginan; dead mild steel; mikrostruktur; fase Cu; Copperizing; immersing time; cooling rate; microstructure; phase Cu |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Anis Wulandari |
| Date Deposited: | 22 Jun 2017 01:54 |
| Last Modified: | 26 Dec 2018 07:01 |
| URI: | http://repository.its.ac.id/id/eprint/41807 |
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