Pengaruh Penambahan Nikel (Ni) Terhadap Kekerasan Dan Struktur Mikro Paduan Fe-Cr-Ni Melalui Metode Pengecoran

Zulfikar, Ainun (2015) Pengaruh Penambahan Nikel (Ni) Terhadap Kekerasan Dan Struktur Mikro Paduan Fe-Cr-Ni Melalui Metode Pengecoran. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Paduan Fe-Cr-Ni adalah paduan logam yang dapat berupa baja tahan karat, paduan super, dan besi tuang putih. Besi tuang putih digunakan sebagai material abrasif karena memiliki kekerasan dan ketahanan aus yang tinggi. Kromium berfungsi sebagai penambah kekerasan dengan membentuk karbida. Nikel sebagai unsur yang menaikkan ketahanan impak. Pada penelitian ini dilakukan variasi penambahan nikel pada paduan Fe-Cr-Ni untuk mengetahui pengaruhnya terhadap kekerasan dan strukturmikro paduan . Penambahan nikel dilakukan dengan komposisi 6, 8, 10 dan 12%wt Ni. Pemaduan dilakukan dalam tungku bakar menggunakan krusibel grafit. Peleburan dilakukan hingga temperatur ±18000C, ditahan ±40 menit. Pendinginan dilakukan didalam tungku bakar hingga temperature kamar. Pengujian yang dilakukan adalah pengujian kekerasan (metode brinell), optical emission spectrometry (OES), XRD, dan metalografi. Hasil OES kadar karbon pada paduan meningkat karena penggunaan krusibel grafit. Hasil XRD menunjukkan terbentuknya fasa austenite γFeNi dan FeCrNi berkristal FCC serta karbida krom. Penambahan nikel meningkatkan kekerasan karena memperkecil ukuran butir pada struktur mikro. Pengamatan metalografi menunjukkan terbentuknya austenite dan karbida krom. ================================================================================================= Fe-Cr-Ni is metal alloy that can become stainless steel, superalloy (nickel base) and high alloy white cast iron. White cast iron is used as an abrasive material because of its hardness and wear resistance. Chromium is added to increase hardness in the form of chromium carbides. Nickel, as the balancing element of chromium, is used to increase impact strength. In this research, nickel was added with variying composition of 6, 8,10 ,and 12% wt Ni. The alloying process occurred in the burner bring graphite crucible. The alloying temperature was ± and held about 40 minutes. The speciments was cooled in the burner until the room temperature. Characterized being conducted in this research were OES, XRD, hardness test, and metallographic test. The result of OES, carbon content increased significantly because of graphite cruciblewas used during melting process. XRD result showed the presence of austenite phase and chromium carbides (Cr7C3). Microstructure of the alloy is chromium carbides with austenitic matrix. Nickel addition was responsible for smaller grain size formed which increase the hardness number. Hardness number also depends of amounts, size and orientation of chromium carbides

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 669.733 2 Zul p
Uncontrolled Keywords: Fe-Cr-Ni, Nikel, γFeNi, Chromium Carbides
Subjects: T Technology > TS Manufactures > TS253 Die-Casting
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User: Yeni Anita Gonti
Date Deposited: 14 Feb 2020 06:50
Last Modified: 14 Feb 2020 06:50
URI: http://repository.its.ac.id/id/eprint/74946

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