利用慢应变速率实验和电化学方法研究了921A钢在海水中不同阴极极化电位下氢脆敏感性的变化趋势,并结合三维视频和扫描电镜观察断口形貌.结果表明,随阴极极化电位的负移,921A钢的韧性降低且氢脆系数增加.在极化电位负于-0.960 V(相对于饱和甘汞电极电位),921A钢的氢脆系数显著增加至约20%,并出现准解理断裂特征形貌.
The susceptibility of 921A steel to hydrogen embrittlement was investigated by slow strain rate test and electrochemical study at different cathodic polarization potentials. Fracture surfaces observation were made by three-dimension microscope and scanning electron microscope (SEM). The results showed that the elongation, time-to-fracture, and fracture energy ratio decreased and hydrogen embrittlement coefficient in-creased with shifting potential in the negative direction. The elongation, time-to-fracture, and fracture energy ratio displayed uniform variance trend and exhibited the highest values when polarization potential was -0.710 V_(SCE). when the polarization potentials were negative to -0.960 V_(SCE), the hydrogen embrittlement coefficient suddenly increased and the fracture surfaces exhibited quasi-cleavage fracture. The brittle fracture was observed by three-dimension microscope when the polarization potential was -1.110 V_(SCE). The resistance of hydrogen embrittlement decreased when the polarization potential reached -0.960 V_(SCE).
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