The effect of nitrogen addition on the mechanical properties of Fe–22Mn–0.6C (wt%) twinning-induced plasticity steel was studied. It was found that the stacking fault energies of the two steels were comparable, and the twinned grain fractions of FeMnC and FeMnC-N steels were similar before the true strain of 0.5. With increasing the strain to 0.7, the fraction of secondary twinned grain rose to support the further strong work-hardening rate of FeMnC-N steel. Moreover, the nitrogen addition suppressed the dynamic strain aging, which can trigger early shear fracture in FeMnC steel. Therefore, the work-hardening rate was kept increasing and the frequency of plastic instability was suppressed by nitrogen addition. As a result, the ultimate tensile strength and uniform elongation simultaneously increased in FeMnC-N steel.

研究了氮的添加对Fe–22Mn–0.6C（wt％）孪晶诱导塑性钢力学性能的影响。结果发现，两种钢的堆垛层错能相当，FeMnC和FeMnC-N钢的孪生晶粒分数在真实应变为0.5之前是相似的。随着应变增加到0.7，二次孪晶晶粒的比例增加，以支持FeMnC-N钢的更高的加工硬化率。此外，氮的添加抑制了动态应变时效，这会触发FeMnC钢的早期剪切断裂。因此，加工硬化率保持增加，并且通过添加氮抑制塑性不稳定性的频率。结果，FeMnC-N钢的极限抗拉强度和均匀伸长率同时提高。