工业纯铁方坯表面裂纹形成原因的分析

CAUSE TO SURFACE CRACKING OF INDUSTRIAL PURE IRON BILLETS

采用金相检验、电子探针、透射电镜分析等方法，对工业纯铁方坯表面出现裂纹的原因进行了分析。

Synopsis Causes to the formation of the surfacecrackings in the pure industrial iron are analyzed by metalloscopy,electron probe micro-analysisand transmission electron microscope examination .Results show that precipitation of the second phase in large quantity in the process of preheating billets is the primary cause leading to the occurrence of the reticular crackings in the pure industrial iron.