PENGARUH KOMPOSISI KROMIUM (Cr) TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA PERKAKAS KECEPATAN TINGGI AISI M10 MELALUI METODE PENGECORAN

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.

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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 > (S1) Undergraduate Theses
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

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