采用声发射检测技术研究了304不锈钢在0.5 mol/L Na2S2O3溶液中的沿晶应力腐蚀过程,根据声发射信号的平均频率及幅值等特征参数,按声发射源将其分为易感晶界的溶解、裂尖的塑性变形及韧带的机械断裂3个阶段,并采用参数关联法及时频法聚类分析了3个阶段的信号特征.试样现场断口形貌及信号特征参数分析结果表明,声发射技术能够用于监测沿晶应力腐蚀演化进程,辨别其微观发展,为其微观机制研究提供依据,实现应力腐蚀在线精确监测.
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