Microstructure of X60 Steel after Heavy-deformation

Single-pass deformation and double-pass hot compression test of X60 steel were tested respectively on the f130 trial two-rollers mill and the Gleeble-1500 thermo-mechanical simulator.The results show the microstructure of deformed sample consists of main polygon ferrite and a little pearlite.There are a lot of dispersed Nb(C,N) precipitates in the ferrite,among the boundaries and on the dislocations.The diameter of the precipitate is about 10 nm or so,which distributed with the form of point-liner or irregular.