论文部分内容阅读
用恒位移试样跟踪观察了铝合金在电化学充氢和应力腐蚀条件下氢致裂纹的产生和扩展过程。结果表明,裂纹前端的塑性区及其变形量随时间延长而逐渐增大,当它发展到临界条件时就导致氢致滞后裂纹和应力腐蚀裂纹的产生和扩展。试验温度、外加极化电压以及氯离子对K_(ISCC)以及da/dt的影响和它们对浸泡充氢后的放氢总量的影响相一致。
The generation and propagation of hydrogen induced cracks in aluminum alloy under electrochemical hydrogen charging and stress corrosion were observed by constant displacement specimen tracking. The results show that the plastic zone and its deformation at the tip of the crack increase gradually with time. When it reaches the critical condition, it leads to the generation and propagation of hydrogen induced hysteresis and stress corrosion cracking. The influence of the test temperature, the applied polarization voltage and the chloride ions on K_ (ISCC) and da / dt is consistent with their effect on the total amount of hydrogen evolution after immersion charge.