Pengaruh Variasi Temperatur Annealing terhadap Sifat Mekanik dan Struktur Mikro pada CuZn35 untuk Aplikasi Selongsong Peluru

Adrinanda, Contardo Ferrini Noval (2021) Pengaruh Variasi Temperatur Annealing terhadap Sifat Mekanik dan Struktur Mikro pada CuZn35 untuk Aplikasi Selongsong Peluru. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh temperatur annealing terhadap sifat mekanik dan struktur mikro paduan CuZn35 sehingga CuZn35 dapat menjadi material alternatuf untuk aplikasi selongsong peluru. Annealing dilakukan pada temperatur 300 hingga 600oC. Karakterisasi sifat material dilakukan melalui uji kekerasan, uji tarik, uji XRD, uji metalografi, dan deep drawing. Hasil pengujian tarik dan kekerasan menunjukkan penurunan dari sifat mekanik kekuatan dan kekerasan hingga temperatur 500oC pada 61 VHN dan 304 MPa dengan perbedaan yang kecil pada temperatur 600oC. Nilai keuletan meningkat seiring dengan meningkatnya temperatur annealing hingga 77.3% pada temperatur 600oC. Hasil metalografi menunjukkan struktur mikro alpha brass yang mengalami twinning pada semua material, dengan ukuran butir yang membesar seiring dengan kenaikan temperatur annealing hingga nilai G sebesar 2.055 pada temperatur 600oC. Deep drawing pada tahap pertama pembentukan selongsong menunjukkan semua material mampu menghasilkan brass cup tanpa adanya retak atau cacat. Spesimen yang memenuhi ketentuan menjadi material selongsong adalah spesimen dengan temperatur annealing 400oC.

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In the present research, the effect of annealing temperatures on the mechanical properties, microstructure, and drawing capability of CuZn35 alloy is investigated. The CuZn35 alloy is to be used as material for ammunition cartridges. Annealing is done at different temperatures ranging from 300-600oC. Hardness test, tensile test, X-ray diffraction, metallography, and deep drawing is conducted on the material to evaluate its properties. X-ray diffraction chart shows the material is still undergoing recovery phase when annealed at 300oC due to high internal stress while for higher temperatures recovery is completed. A decrease in the hardness and ultimate tensile strength of the material is observed with increase in annealing temperatures, down to 61 VHN and 304 MPa at 500oC, and only a minor decrease afterwards. Ductility of the material is increased with increasing annealing temperatures up to 77.3% at 600oC. Metallography results show a microstructure of twinned alpha grains, with an increasing grain size up to a G value of 2.055 at 600oC. Deep drawing of the first phase in cartridge forming is conducted, and all test material shows good drawing capability. The material suited for application of ammunition cartridges are CuZn35 with annealing temperatures of 400oC.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Annealing, Kuningan, Selongsong peluru, Sifat mekanik, Struktur mikro, Annealing, Brass, Cartridge case, Mechanical properties, Microstructure
Subjects: T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy
T Technology > TS Manufactures > TS205 Metals--Heat treatment.
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering
Depositing User: Contardo Ferrini Noval Adrinanda
Date Deposited: 12 Aug 2021 14:11
Last Modified: 12 Aug 2021 14:11
URI: http://repository.its.ac.id/id/eprint/85912

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