Detail Cantuman Kembali
Pengaruh Normalising Terhadap Struktur Mikro dan Sifat Mekanis Pada Poros dan Disc Turbin Crossflow T14 Setelah Mengalami Proses Pengelasan
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INTISARI
Penelitian ini bertujuan untuk mencari pengaruh normalising terhadap struktur
mikro dan sifat mekanis pada poros dan disc turbin Crossflow T.14 setelah
mengalami proses pengelasan.
Bahan poros dan disc yang terbuat dari baja karbon rendah disambung dengan las
busur listrik menggunakan bahan elektroda RB 26, diameter 2,6 mm, arus 90 amper
dengan pengelasan satu lapis bolak-balik. Proses normalising dilakukan dengan
memanaskan kembali poros dan disc, sesuai kadar karbon baja sebesar 930ºC, dengan
percobaan normalising menggunakan holding time 15, 30 dan 45 menit. Kemudian
bahan-bahan tersebut dibuat benda uji tarik, geser, kekerasan dan pengamatan
struktur mikro.
Hasil penelitian menunjukkan uji tarik bahan dasar disc sebesar 34,18 kg/mm²,
bahan dasar poros 55,3 kg/mm² dan sambungan disc yang di normalising sebesar
28,92 kg/mm². Pengujian geser sambungan poros dan disc 31,57 kg/mm², setelah di
normalising menjadi 34,83 kg/mm². Hasil pengujian kekerasan sambungan poros dan
disc di normalising pada pusat las 110,13 kg/mm², HAZ disc 117,45 kg/mm², HAZ
poros 109,19 kg/mm², bahan dasar disc 98,91 kg/mm² dan bahan dasar poros 112,85
kg/mm². Struktur mikro pada sambungan poros dan disc setelah di normalising
didapatkan struktur yang halus dan seragam.
Kata-kata kunci : Normalising, Struktur mikro, Sifat mekanis.
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ABSTRACT
The goal of this research was to find out effects normalizing on the micro
structure and mechanical properties on the shaft and disc Crossflow turbine T.14 after
a local heating process.
The shaft material and disc were made of low carbon steel which were joined
with arc welding by using RB 26, electrode with 2.6 mm diameter, 90 ampere
electrical current through one layer vice versa welding. The process of normalizing
through shaft and disc, has heated at the normalizing temperature 930ºC, by using
holding time at 15, 30 and 45 minute. After the previous process of the material was
made the tensile strength, shear strength, hardness and observation of micro structure
specimens.
The result of research shows the tensile strength of the base material of disc is
34.18 kg/mm², base material of shaft is 55.3 kg/mm² and normalizing use joint the
disc is 28.92 kg/mm². The result of shear strength on shaft joint and disc is 31.57
kg/mm² and after normalizing becomes 34.83 kg/mm². The result of hardness Vickers
on shaft and disc joint after normalizing in the center of welding is 110.13 kg/mm²,
on the HAZ of the disc is 117.45 kg/mm², HAZ of the shaft is 109.19 kg/mm² and on
base material of the disc is 98.91 kg/mm², base material of the shaft is 112.85
kg/mm². The micro structure on the shaft and disc joint after normalizing is found
homogen structure of ferrit and pearlit.
Keywords : Normalizing, Micro Structure and mechanical properties.
xviii
Juli 2004
R 153.43 Ant p c.1 07.2004
153.43
Thesis
Indonesia
Magister Sistem Teknik UGM
2004
Yogyakarta
xviii, 81 hlm.; ilus.; 29 cm.
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