Effect of Austenitizing Time at Intercritical Austenitizing Temperatures on Microstructural Features of Ductile Cast Iron
AbstractIn the present study, effect of austenitizing time at intercritical austenitizing temperatures was investigated on the microstructural features of ductile cast iron. For this aim, unalloyed ductile cast iron samples intercritically austenitized at 790 and 800 ° C for 1, 5, 15, 30, 60 and 120 min. The samples were water quenched following intercritical austenitizing. Ferrite + martensite dual phase matrix structures have been observed in intercritically austenitized and quenched samples. Martensite volume fraction was increased with increasing austenitizing time. The martensite volume fraction was significantly increased up to 30 min and no remarkable increment in martensite volume fraction after 30 min. The martensite volume fraction can be controlled both intercritical austenitizing time and temperatures.