PENGARUH NORMALISING PASCA COLDWORKING PADA BAJA KARBON
ABSTRACT: Metal forming
processes relating with dimensional
changes and micro structure of the metal material. One type
ofmetal forming processis
the coldworkingprocess, the
metal forming processunder thecrystallizationtemperature. Carbon
steelis
ametalmaterialwhichhas many advantages
to the use ofenginecomponentswho needhigh
strength, hightemperature resistant,able toformandgoodmachineable. Meanwhilethe normalizingheat treatmentisa
processthat
aimstoeliminatethestressandmake thefinegrainmicrostructuredueprocesscoldworkingon
steel.This study aims to determine the change in microstructure and mechanical properties
of carbon steel
and the effect
of variation holding
time after the coldworking process.
Material scold working process conducted in this studyisa lowcarbon
steelwith anormalizingprocessat a temperature
of 890° Candholding time variation of10minutes,
30minutesand50minutes. The changesmaterial propertiesare known from observations
microstructure, hardnesstestandpressure test (bending).
Research results showthatthehardnessvalue ofthe
materialnormalizingdecreasedcompared torawmaterialorthe
materialforming withoutnormalizing, in addition totheproperties ofits ductility increases with the ferritegra
instructure that is getting bigger and homogeneous at the time that the longer lasting
normalizing
Penulis: Juriah Mulyanti,
Ismanto, Eko PutroKris Hartanto
Kode Jurnal: jptmesindd130315
