The effects of V and Nb addition on the microstructure and mechanical properties of a cold-rolled and intercriticallly annealed 5Mn steel were investigated. Compared to a steel without V or Nb the recrystallization in microalloyed steel was retarded significantly from the beginning of annealing, which resulted in a 100–200 MPa increase in both yield and tensile strength while the degradation of ductility was not observed. Negligibly small change in elongation was attributed to a larger degree of carbon enrichment due to the smaller volume fraction of retained austenite and accelerated Mn transport through high density dislocations, which may well have operated to increase the austenite stability.

研究了钒和铌的添加对冷轧和经临界退火的5Mn钢的组织和力学性能的影响。与不含V或Nb的钢相比，微合金钢的重结晶从退火开始就显着延迟，这导致屈服强度和抗拉强度增加100-200 MPa，而未观察到延展性的降低。延伸率的微小变化可归因于较大的碳富集度，这是由于残余奥氏体的体积分数较小，并且通过高密度位错加速了Mn的运移，这很可能增加了奥氏体的稳定性。