PERDANA, HAFIDH FRIAN (2016) PENGARUH KOMPOSISI KROMIUM (Cr) TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA PERKAKAS KECEPATAN TINGGI AISI M10 MELALUI METODE PENGECORAN. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
2712100015-Undergraduate_Theses.pdf - Published Version Download (8MB) | Preview |
Abstract
Baja perkakas kecepatan tinggi AISI M10 adalah baja
paduan Fe-Mo-V-Cr dengan kadar 8% berat Mo, 4% berat Cr, 2%
berat V, dan 0,85% berat C. Baja perkakas ini memiliki sifat
keras pada temperatur tinggi (hot hardness) sehingga mampu
menahan pelunakan (tempering) pada laju potong yang tinggi.
Sifat hot hardness dapat dimiliki paduan dengan struktur mikro
yang tersusun atas sejumlah besar karbida dalam matriks yang
dapat dikeraskan. Kromium mampu meningkatkan sifat mekanik
baja paduan Fe-Mo-V-Cr. Pada penelitian ini, varasi komposisi
kromium (Cr) sebesar 2, 4, 6, 8% berat pada AISI M10 paduan
Fe-Mo-V-Cr dilakukan untuk mengetahui pengaruhnya terhadap
struktur mikro dan kekerasan paduan. Fe-C, ferrochrome,
ferromolybden, ferrovanadium, dan karbon dimasukkkan ke
dalam Electric Arc Furnace dengan elektroda grafit pada
temperatur 1900oC selama 120 detik. Spesimen paduan Fe-Mo-VCr
dikarakterisasi dengan Optical Emission Spectroscopy (OES),
uji kekerasan, uji metalografi, dan X-Ray Diffaction (XRD).
Struktur mikro hasil coran paduan menunjukkan keberadaan
sementit, karbida (Fe,Mo)23C6, dan karbida (Fe,Cr)23C6 dalam
matriks Fe. Penambahan kromium pada paduan Fe-Mo-V-Cr
menyebabkan nilai kekerasan meningkat karena terjadi
mekanisme solid solution hardening dan pembentukan karbida.
Paduan Nilai kekerasan tertinggi sebesar 53 HRC terdapat pada
paduan Fe-8Mo-2V-8Cr.
==========
AISI M10 high speed steel (HSS) is Fe-Mo-V-Cr alloy
which has 8%wt Mo, 4%wt Cr, 2%wt V, and 0.85%wt C. This
tool steel has ability to maintain high hardness at elevated
temperatures (hot hardness) so it can resist softening due to
tempering at high cutting speed. Good hot hardness property
depends on microstructures that consist of great amount carbide
in hardenable matrix. Chromium was added to improve
mechanical properties in Fe-Mo-V-Cr alloy. In this work,
influence of chromium composition (2, 4, 6, 8% wt) on
microstructure and hardness of M10 HSS was studied. Fe-C, Fe-
Cr, Fe-Mo, Fe-V, and C was melted in Electric Arc Furnace with
graphite electrode at 1900oC during 120 s. The cast alloys were
characterized using Optical Emission Spectroscopy (OES),
hardness test, metallography, and X-Ray Diffraction (XRD).
Microstucture of M10 HSS as cast showed cementite, (Fe,Mo)23C6
carbide, (Fe,Cr)23C6 carbide in ferrite matrix. Chrome addition
on Fe-Mo-V-Cr incrases Cr composition that can improve
hardness through solid solution hardening and carbide forming
mechanism. Fe-8Mo-2V-8Cr alloy has the highest hardness
which the value is 53 HRC.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Fe-Mo-V-Cr, Kromium, Karbida Logam,Kekerasan, Chromium, Metal Carbide, Hardness |
| Subjects: | T Technology > TS Manufactures > TS253 Die-Casting |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 27 Dec 2016 08:05 |
| Last Modified: | 27 Dec 2018 03:31 |
| URI: | http://repository.its.ac.id/id/eprint/1217 |
Actions (login required)
 |
View Item |