KAJIAN LETAK SALURAN MASUK (INGATE) TERHADAP CACAT POROSITAS, KEKERASAN, DAN UKURAN BUTIR PADUAN ALUMINIUM PADA PENGECORAN MENGGUNAKAN CETAKAN PASIR
Abstract: This study aims to
determine the effects of ingateposition to porosity defect, hardness, and grain
size of aluminum alloys in casting by using sand molds. The raw
material of this
study is aluminum
alloy. This reasearch
will be assessed position of
ingate in top and bottom. Porosity testing is conducted by comparing the
real density to the apparent
density. Grain size testing
is conducted by using
image analysis software
with perimeter approach.
And hardness testing is
conducted by using
microvickers hardness test in accordance with ASTM E92-82.
The results showed that the average percentage of the highest porosity
found in the position
of the ingate
in top 10.34%
while in bottom
just 8.16%. Hardness increases as
the percentage decrease in porosity defects that occur. The position of ingate
in top has a hardness 94.06 HV while in bottom 102.1 HV. The average perimeter
of grain size of positioningate in
top 25.39 µm while
in bottom 22.77
µm. The greater
the percentage of
porosity and the grain size, the lower hardness values of
these metals.
Penulis: Bambang Kusharjanta,
Dody Ariawan, Murjoko
Kode Jurnal: jptmesindd110005
