Strain-induced precipitation behavior of V microalloyed high manganese steel

This study examines the isothermal precipitation behavior of V(C,N) in V-containing high manganese steel through stress relaxation experiments and TEM analysis. By comparing experimental and theoretical PTT curves, it is shown that deformation shifts the curves left due to stored energy. For 0.1V steel, the PTT curve displays a "C" shape with a nose temperature of 830°C and a minimum incubation time of 4.2 s. In 0.2V steel, a "double-C" shape emerges, reflecting N-rich and C-rich V(C,N) precipitation. Grain boundaries dominate nucleation, but decreasing temperature increases the driving force, enabling dislocation and rare homogeneous nucleation. Higher V content accelerates precipitation kinetics, yielding more and larger precipitates, enhancing the precipitation potential under similar deformation conditions.