Rosalia, Olivia (2016) Pengaruh Variasi Waktu Tahan Solution Treatment Dan Aging Terhadap Perubahan Mikro Struktur Serta Kekerasan Copperized-AISI 1006. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Keberadaan tembaga dalam baja merupakan alasan precipitation
hardening dilakukan karena penambahan tembaga di dalam baja
dapat berperan sebagai grain refinement agent dan solid solution
strengthening agent. Penelitian ini bertujuan untuk menganalisis
pengaruh penambahan tembaga dan pengaruh waktu tahan
solution treatment serta waktu tahan aging terhadap perubahan
struktur mikro,dan perubahan nilai kekerasan copperized-
AISI1006. Preparasi spesimen dilakukan dengan memotong
spesimen dimensi 3x30x90 mm dan membersihkan permukaan
spesimen dari karat dan pengotor, tahap penelitian terdiri dari
metode copperizing yaitu dengan memanaskan baja pada
temperature pre-heat 900°C dan copperized-AISI 1006 pada
temperature sekitar 1083°C dengan immerse time yaitu 5 menit
dilanjutkan pendinginan normalizing kemudian dilakukansolution
heat treatment dengan variasi waktu tahan yaitu 30 dan 60 menit
pada temperatur 900oC lalu diquenching. Setelah itu dilakukan
aging dengan variasi waktu tahan yaitu 30,60 dan 90 menit pada
temperatur 450oC dengan pendinginan normalizing. Tahap akhir
adalah tahap identifikasi yang mana serangkaian pengujian
spesimen dilakukan, adapun pengujian-pengujian tersebut antara
lain: uji komposisi unsur menggunakan alat Optical Emission
Spectroscopy (OES), uji perubahan struktur mikro dengan
menggunakan alat mikroskop optik, uji kekerasan dengan
menggunakan alat uji kekerasan mikro vickers serta uji
karakterisasi material menggunakan alat SEM/EDX dan XRD.
Dari hasil pengamatan makro memperlihatkan adanya lapisan
tembaga dan oksida di permukaan substrat, hasil pengujian
struktur mikro terbentuk struktur dominan matriks α-ferit dengan
fasa kedua berupa partikel Fe-Cu pada batas butir serta lamanya
waktu tahan pada solution treatment dan waktu tahan aging
menyebabkan naiknya luasan daerah batas butir. Hasil pengujian
OES memperlihatkan kenaikan kadar tembaga dalam baja sebesar
0,0905% dan mapping tembaga menunjukkan bahwa cluster
tembaga memiliki kecenderungan berkumpul di batas butir.
Pengujian XRD menunjukkan adanya pergeseran puncak Fe
yang mengindikasikan Cu masuk kedalam Fe dan terbentuk fasa
baru yaitu Cu0,003Fe0,997. Sedangkan pengujian kekerasan
memperlihatkan penurunan nilai kekerasan setelah dilakukan
proses aging.
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The existence of copper in the steel was one of the reason why
this precipitation hardening was perfomed. The addition of copper
inside the steel has a role as grain refinement agent and solid
solution hardening agent. This research aimed to analyse the
effect of cooper addition and theeffect of holding time of solution
treatment and holding time of aging in the copperizing process of
AISI 1006 towards the transformation of microstructure, and the
alteration of AISI 1006 hardness number. The preparation of
specimen wasperfomed by cutting the specimen into 3 x 30 x 90
mm and cleaning the surface of the specimen from rust and
impurities. The step of this research consisted of copperizing
method by pre heating the steel until 900o C and heating the
copperized AISI 1006 until 1083o C with immerse time, 5
minutes which followed by cooling normalizing and then solution
het treatment was perfomed with variation of holding time 30
minutes and 60 minutes at 900o C and followed by quenching.
After that, aging was performed with holding time variation 30,
60 and 90 minutes at 450o C and followed by cooling
normalizing. The final step was identification of specimens which
perfomed by elemental composition test using Optical Emission
Spectroscopy (OES), transformation of microstructure test using
optical microscope, hardness test using micro Vickers and
material characterization using SEM/EDX and XRD. The result
of macro observation showed that there were copper and oxide
layer on the surface of the substrate and from microstructure
examination showed there were formed the dominant structure
was α-ferit matrices with the second phases in the form of
granular bainite which consisted of irregular ferrite and Fe-Cu
particle in the grain boundary, also the duration of holding time in
solution treatment and aging caused the expansion of grain
boundary area. The result of OES examination showed the
increasing of copper content inside the steel as much as 0,0905%
and copper mapping showed that copper cluster had a trend to
accumulate in the grain boundary. XRD examination showed the
shifting of Fe peak which indicated the diffusion of Cu inside the
Fe and new phase, Cu0,003Fe0,997was formed. While hardness test’s
result exhibited the decreasing hardness number after aging
process was perfomed.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.182 Ros p |
| Uncontrolled Keywords: | AISI 1006; aging; copperized; precipitation hardening; solution treatment; waktu tahan; copperized; holding time |
| Subjects: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Anis Wulandari |
| Date Deposited: | 16 Jun 2017 07:23 |
| Last Modified: | 27 Dec 2018 06:52 |
| URI: | http://repository.its.ac.id/id/eprint/41720 |
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