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在慢应变速率条件下,对16MnR 钢的应力腐蚀过程进行了声发射监测,在应力腐蚀过程中利用声发射系统(3000/3004,USA)测定了声发射计数,计数率,总能量和总计数等参量。根据宽带连续检测所记录的声发射信号数据,得到了对应于不同声发射信号波形和频谱的情况。试验结果表明,16MnR 钢在20℃的3.5%NaCl 水溶液的应力腐蚀条件下所产生的声发射信号要比在空气中丰富。根据声发射数据和统计参量确定开裂点,同时可以描述应力腐蚀过程。根据典型声发射信号的波形和频谱特征,有可能判断应力腐蚀过程中声发射源的类型。上述声发射监测结果,经断口扫描电镜分析得到了验证。
Acoustic emission monitoring was performed on the stress corrosion process of 16MnR steel at a slow strain rate. Acoustic emission counts, count rates, total energies, and total counts were measured using an acoustic emission system (3000/3004, USA) during stress corrosion Other parameters. According to the broadband continuous detection of acoustic emission signal recorded data, corresponding to different acoustic emission signal waveform and frequency of the case. The experimental results show that the acoustic emission signal of 16MnR steel is more than that of air in the stress corrosion of 3.5% NaCl aqueous solution at 20 ℃. According to acoustic emission data and statistical parameters to determine the crack point, at the same time can describe the stress corrosion process. Based on the waveform and spectral characteristics of a typical acoustic emission signal, it is possible to determine the type of acoustic emission source during stress corrosion. The acoustic emission monitoring results obtained by the fracture scanning electron microscopy analysis has been verified.