PENGARUH PERLAKUAN PANAS TERHADAP STRUKTUR MIKRO DAN KEKERASAN CORAN PADUAN Al-Mg-Si
Abstract: The aim of this
research is to investigate the effect of the heat treatment to the Al-Mg-Si
microstructure and hardness. The material used is from scrapped truck piston.
It is melted and poured into the sand mould at 875o C. Then the
specimens are made under JIS Z2245 standard for Rockwell hardness testing. The
heat treatment is performed by heating the specimens (called solution
treatment) in the furnace with temperature variation 5000C, 5500C and 6000 C
for 30, 60 and 90
minutes respectively. The
specimens then are quenched
into the water
and aged in
the air for
5 days. After hardness testing
of the specimens,
the microstructure investigation
is performed by an optical microscope. For each variation, hardness
testing is done for 3
specimens. This research
indicates that the
heat treatment increases the
hardness of Al-Mg-Si
alloy. At the
solution treatment temperature
500o C, 550o C and 600o C for 30 minutes, the average hardness obtained are
77,67, 77,33 and 76 HRC
respectively. Meanwhile at the
solution treatment temperature
500o C for 30,
60 and 90
minutes, the average
hardness obtained are 77,67, 76,67 and 76,33
HRC respectively. From this
research, it is concluded that the solution treatment followed by quench and
aging can increase
the hardness of
the Al-Mg-Si alloy.
The higher its temperature and longer its process the lower material
hardness obtained although it is not so significant.
Penulis: Wahyu Purwo Raharjo
Kode Jurnal: jptmesindd080022
