Precipitation Phenomena in V-Microalloyed 0.15-0.22 % C Structural Steels

摘要

The role of nitrogen and carbon in vanadium microalloyed structural steels isdiscussed in the present paper which analyses quantitatively the theoretical basis for achieving maximum precipitation strengthening with a minimum of V addition. The effect of nitrogen, in particular, has been studied with regard to precipitation of the V(C,N) in proeutectoid ferrite and pearlite during isothermal and continuous transformation. The influence of various compositional and process parameters on the microstructure and yield strength have been determined. The precipitation strengthening contribution to the yield strength from V(C,N) has been evaluated and compared with Orowan theory.