We investigated the effect of Nb micro-alloying in the range of 0.01 to 0.l wt% on the microstructures and mechanical properties of Fe17Mn0.6C1.5Al (wt%) TWIP steel. EBSD analysis shows that the Nb addition retards recrystallization in both the hot-rolled steels and cold-rolled and annealed steels. The Nb addition in the cold-rolled and annealed TWIP steel leads to an increase in yield strength. This phenomenon is due to a combined effect of precipitation hardening and a low degree of recrystallization. Recovery annealing of the cold-rolled TWIP steels at 650 °C results in a good combination of yield strength and ductility. The steels containing 0.01 wt% and 0.025 wt% of Nb show a superior combination of UTS×TE exceeding 40,000 MPa∙% and yield strength higher than 800 MPa. The design of TWIP steels utilizing both precipitation hardening and partial recrystallization opens a way to develop steels with a superior combination of yield strength and ductility.

我们研究了0.01％至0.1％wt％的Nb微合金化对Fe17Mn0.6C1.5Al（wt％）TWIP钢的组织和力学性能的影响。EBSD分析表明，Nb的添加会阻碍热轧钢以及冷轧和退火钢的再结晶。在冷轧和退火的TWIP钢中添加Nb可以提高屈服强度。这种现象是由于沉淀硬化和低结晶度的综合作用所致。在650°C下对冷轧TWIP钢进行恢复退火，可以将屈服强度和延展性很好地结合在一起。含0.01％（重量）和0.025％（重量）的Nb的钢，其UTS×TE的优良组合超过40,000 MPa∙％，屈服强度高于800 MPa。