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用电镜观察了充氢后双相钢的亚结构,探讨了氢致双相钢机械性能下降的原因。观察表明:充氢后,F相中位错增殖,最后形成胞状亚结构;M相中位错组态变化不明显,但随充氢量增加,裂纹将在M板条界萌生和扩展,有时也横穿M板条;F/M相界充氢后出现宽化现象,并向F相一侧增殖位错,进而界面起裂。M量越多,则此现象越明显。M相与F/M相界起裂对充氢电流密度比充氢时间更为敏感。M相及F/M相界充氢后损伤严重,导致双相钢塑性下降,成为宏观拉伸时易于裂纹萌生和扩展的薄弱部位。
The electron microscopy was used to observe the substructure of the dual phase steel after hydrogen charging. The reasons for the decrease of mechanical properties of hydrogen induced duplex steel were discussed. The results show that dislocation propagates in F phase and finally forms cellular sub-structure. However, the dislocation configuration of M phase is not obvious. However, with the increase of hydrogen content, the crack will initiate and expand in M plate boundary. Also across the M slab; F / M phase after the hydrogenation of the widening phenomenon, and to the F phase proliferation dislocation, and then the interface initiation. The more the amount of M, the more obvious this phenomenon. M-phase and F / M phase boundary cracking is more sensitive to charge current density than charge hydrogen time. M phase and F / M phase boundary hydrogen damage after severe damage, leading to dual-phase plasticity decreased, a macro-prone to crack initiation and propagation of weak parts.