Effect of Hot Deformation on the Mechanical Property and Microstructure of Patented High Carbon Steels

Abstract

The effect of hot deformation on pearlite transformation behavior has been studied in high carbon steels using direct patenting treatment. Patenting after hot deformation showed the refinement of pearlite lamellar spacing and an increase in tensile strength. In order to study the transformation kinetics change due to hot deformation, the Jominy end quench tests have been carried out directry after hot rolling and compared with the usual Jominy curves obtained using reheated specimen with same austenite grain size. This method showed an increase in the hardenability, which was accompanied by suppresion of Widmanstätten ferrite and bainite nucreation and pearlite growth. Furthermore, the magnitude of increase in hardenability depend on the carbon and manganese contents, and the curved austenite grain boundary which was preserved by rapid cooling.