Pengaruh Anil terhadap Struktur Mikro dan Kekerasan pada Besi Cor Putih

Abstract

In the metal casting industry, we often hear about a type of cast iron called white cast iron. White cast iron is a type of cast iron that does not have graphite, so it has very hard but brittle mechanical properties. This study was conducted to determine the microstructure before and after the annealing process, as well as the hardness value of white cast iron. Metallographic testing and composition testing were carried out using Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS), while hardness testing was carried out using the Rockwell hardness method. The results of SEM raw material testing showed that in white cast iron there were cementite (Fe₃C) and pearlite phases. While the results of SEM annealing testing showed that in white cast iron there were cementite (Fe₃C), pearlite, and graphite phases. The results of EDS raw material testing showed that in white cast iron the cementite phase contained the element Fe (Ferro) of 84.3% by weight, the element C (Carbon) by 14.67% by weight, and the element Cr (Chromium) by 0.7% by weight. Then, in the perlite phase, there is a Fe (Ferro) element of 85.5% by weight, a C (Carbon) element of 13.2% by weight, and a Si (Silicon) element of 1.2% by weight. The results of the EDS annealing test show that in the cementite phase white cast iron there is a Fe (Ferro) element of 83.8% by weight, a C (Carbon) element of 14.5% by weight, and a Cr (Chromium) element of 1.6% by weight. In the perlite phase there is a Fe (Ferro) element of 85.9% by weight, a C (Carbon) element of 12.7% by weight, and a Si (Silicon) element of 1.4% by weight. Then, in the graphite phase, there is a Fe (Ferro) element of 31.0% xii by weight, a C (Carbon) element of 38% by weight, a Si (Silicon) element of 0.2% by weight, and an O (Oxygen) element of 30.8% by weight. The results of the hardness test showed that the hardness value of the raw material specimen obtained an average hardness value of 48.3 HRC. While the specimen that had been annealed obtained an average hardness value of 38.5 HRC. So the annealing heat treatment process can reduce the value of white cast iron