Pengaruh Waktu Proses Austemper Terhadap Struktur Mikro, Kekerasan, Dan Kekuatan Paduan Fe-1Al-6,9C
Abstract
This study aims to analyze the effect of austemper processing time on the microstructure, hardness, and strength of Fe-1Al-6.9C alloy cast iron. 0The process carried out is austemper starting with heating at T 900°C for 1 hour, followed by immersion in molten salt (KNO3 55% + NaNO3 45%) at T 300oC for 10, 15, 20, 25, 30 minutes, ending with immersion in water. The tests carried out were chemical composition test using a spectrometer, microstructure test with an optical microscope, hardness test using the Brinell method, and tensile testing. The results of testing the chemical composition of the Fe-1Al-6.9C alloy showed that the content of the main element iron (Fe) was 89.40%, and the main alloying element was aluminum (Al) 0.98%, carbon (C) 6.94%. The microstructure of Fe-1Al-6.9C alloy consists of ferrite, pearlite and graphite structures, after the austemper process the pearlite structure changes to bainite. The results of the hardness test showed that the austemper process increased the hardness value and reached a maximum (407.44 Kg/mm2) on holding for 30 minutes in molten salt. Tensile test results show that Fe-1Al-6.9C alloy has stress and strain values ​​of 76.5 MPa and 6.68%, the austemper process reduces stress and strain values ​​so that it reaches the lowest values ​​(37.07 MPa and 3.2%) on holding for 25 min in molten salt.
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