MICROSTRUCTURE EVOLUTION AND HARDNESS IMPROVEMENT OF GRAY CAST IRON BY ADDITION OF FeSiMg FOLLOWED BY FLAME HARDENING PROCESS

The addition of magnesium alloy elements followed by a flame-hardening process will change the phase configuration in gray cast iron. This study aims to investigate changes microstructure and hardness due these two processes. is conducted adding FeSiMg as carrier for magnesium. Metallographic examination observe was carried out using Scanning Electron Microscope (SEM) Energy-Dispersive X-ray Spectroscopy (EDS). formed examined X-Ray Diffraction testing. test Vickers technique on surface iron, nodular flame-hardened Whilst also cross-section. compound changed flake graphite into spherical with increased from 130 VHN 313.22 VHN. iron results formation martensite disappearance material. material 82.4% compared substrate.