PENGARUH TINGGI SPRUE TERHADAP STRUKTUR MIKRO, KEKERASAN DAN KEKUATAN TARIK PADA PRODUK PENGECORAN ALUMUNIUM PADUAN BERBASIS MATERIAL PROPELLER BEKAS

FITRIANI, ERMAWATI (2018) PENGARUH TINGGI SPRUE TERHADAP STRUKTUR MIKRO, KEKERASAN DAN KEKUATAN TARIK PADA PRODUK PENGECORAN ALUMUNIUM PADUAN BERBASIS MATERIAL PROPELLER BEKAS. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The metal foundry industry is growing along with the development of casting techniques and methods as well as various models of cast products that are flooding the domestic market. Cast products are widely used in daily life from household furniture, automotive parts, ships, to airplanes. This casting uses aluminum alloys derived from used aluminum-based propellers. With high variations of sprue used are: 50 mm, 100 mm, and 150 mm. This test aims to determine the effect of high sprue variation on tensile strength, hardness, and micro structure. Cast aluminum is tensile tested according to ASTM E8 / E8M-09 standard and hardness values using Vickers hard test apparatus with diamond pyramid indentors weighing 150 Kg. The test results showed that the largest tensile strength was 21.86 Kgf / mm2 on a high sprue variation of 150 mm and the lowest tensile strength was 18.15 Kgf / mm2 on a high sprue variation of 100 mm. Meanwhile, the cast product on aluminum alloy based propeller used has the greatest hardness of 82.2 HV on high sprue variation of 150 mm and the lowest hardness is 71,10 HV without using sprue height. The analysis is supplemented by microstructural observations. In the observation results obtained the conclusion that the higher the sprue the more solid precipitate and soft particles.

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