INFLUENCE OF NANO SUBSTRUCTURE OF CEMENTI TE LAMELLAE ON THE MECHANICAL-PROPERTIES OF GALVANIZED PEARLITIC STEEL WIRES

It is well known that Si improves the mechanical properties of hot dip Zn-galvanized pearlitic steel wires. However, the improving mechanism is still not clear. Thus, hot Ip galvanized pearlitic steel wires wer e investigated by TEM observation from the viewpoint of the sub-struct ure of cementite lamellae. The presence of nano sized substructure was observed in electrolytically extracted cementite lamellae after hot d ip Zn-galvanization process. The mean diameter of cementite sub-struct ure in the high tensile strength Si-containing pearlitic steel is much filler than that in a conventional low Si steel. Hence, it is conclud ed that Si improves the mechanical properties of galvanized pearlitic steel wires by refining the substructure of cementite lamellae.