Abstract
In this study, carbon steels(545C,SK105C)were kept constant austenitizing temperature(1200℃)and the cooling rate from 750℃ to 700℃ was changed. This cooling rate will give us the pro-eutectoid cementite and ferrite of large size. Then, the sample was cut off thinly using the wire-cut electric discharge machine and the surface of sample has been corroded with Kalling's reagent. It was able to get the sample that only the ferrite dissolved in reagent the pro-eutectoid cementite and lamellar cementite remain in sample. The voids made by resolving the pro-eutectaid ferrite have been observed by the use of Scanning Electron Micro-scope(SEM).
