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Elfendri -
Fakultas Teknik
Mechanical Engineering

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PENGARUH MEDIA PENDINGIN TERHADAP KEKERASAN MAKRO DAN MIKRO Ni – HARD IV Elfendri -
Jurnal APTEK Vol. 1 No. 1 (2009): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.63 KB) | DOI: 10.30606/aptk.v1i1.9

Abstract

Ni – Hard IV is white cast iron alloy with high persentage on nikel ( Ni ) and Chromium ( Cr ) . It’s material is used in machine component that need high hardness and wear resistance, like roller on cement factory that used to raw material of cement ( clay, silica, stone and coal ).On operation the component which built with Ni – Hard IV will be fricted by abrasive material of cement. The expensive price component will be wear and unfunction. We need long time to make reservation for a new one.This problem can solved by making remanufacturing compnent . The damage component can be remanucfatured by arc welding method that use air in our enviroment on atmospheric temperatur as a cooler. It’s mean we applicate the normalizing Process method
Pengaruh Parameter Proses Pengecoran Squeeze (Temperatur Tuang, Temperatur Cetakan dan Kandungan Si) Terhadap Struktur Mikro, Kekerasan dan Kekuatan Tarik pada Benda Cor Tipis Al-Si Elfendri -
Jurnal APTEK Vol. 3 No. 1 (2011): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/aptk.v3i1.30

Abstract

The objective of this is to study the effects of melt temperature, die temperature and Si content) on microstructure, hardness and tensile strength in squeeze casting (direct squeeze casting) of thin casting material, Al-0.45%Si, Al-3.22%Si and Al-6.04%Si.The alloys were melted on crucible furnace and cast at the temperatures of 665°C, 775°C and 885°C, in die-punch mold heated at the temperatures of 220°C, 275°C and 330°C. Pressure of 135 MPa was applied to press liquid metal in the mold. Microstructure were observed by using optical microscope. Vickers’ hardness and tensile strength were conducted to identify mechanical properties.Results of the tests indicated increase in casting temperature causing increasingly thinner and globular silicone fragments, reduced hardness and tensile strength. The thicker silicone fragments, reduced hardness and tensile strength occurred with the intensifying temperature of the mold. Increase in Si content resulted in thicker and more abundant silicon flakes, intensifying hardness and tensile strength.
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