The Effect Of Alloying Elements Partitioning On Microstructure And Properties Of The Pearlitic Steel

High carbon hot rolled wire rod is widely used in the production of galvanized steel wire for bridge cables,tire cord,cutting steel wire,and other high-performance metal wire.Si,Mn,as important alloying elements have great effects on the microstructure and property of wire rod and cold drawn steel wire.In this paper,the partition behavior of alloy elements Si,Mn during the process of pearlite transformation and its effects on microstructure and properties with two different contents have been studied.The partition behavior of alloying elements during pearlite transformation was studied.It was shown that Si is mainly enriched in the ferrite phase and Fe3C/a-Fe interfaces,while Mn partitions to cementite.Mn partitioning affected by the content of Si in the steel and the phase-transition temperature.Meanwhile,Higher Si content led to more pronounced partitioning of Mn in low pearlite transformation temperature due to the interactions of Si and Mn.The promoting effect of Si will be relatively weakened as the transformation temperature increases.Effects of alloy elements on the microstructure and mechanical properties of cold drawing pearlitic steel wire were studied.Cementite enriched Mn can improve its stability during the 450?aging treatment,delay the spheroidization rate,reduce the strength loss of steel wire in the process of hot dip galvanized and delay the age softening time.While the effect of Si is that it can improve the strength of pearlite rod and reduce the work hardening rate of cold drawing steel wire.