低碳钢氢蚀后拉伸过程中的声发射特征

中国腐蚀与防护学报, 1994, 14(4): 304-310.

低碳钢氢蚀后拉伸过程中的声发射特征

抚顺石油学院机械系

ACOUSTIC EMISSION CHARACTERISTICS OF HYDROGEN ATTACKED LOW-CARBON STEEL IN TENSILE PROCESS

Li Xiaogang , Wang Zhenfu , Chen Hua , Yao Zhiming , Ke Wei(State Key Laboratory of Corrosion Science)(Chinese Academy of Sciences)

Keywords： :Low-carbon steel;Hydrogen attack; Acoustic emission;Tensile , 低碳钢 , 拉伸 , 声发射

对氢蚀前后低碳钢拉伸过程中的声发射（ＡＥ）行为进行了研究．结果表明，氢蚀使低碳钢拉伸过程事件数明显减少，但是高幅声发射信号的振铃计数明显增多．声发射源以显微裂纹长大与连接为主．

Acoustic emission(AE) behaviour of low-carbon steel samples,which have been attacked upon exposure to hydrogen of 18MPa at temperatures 450℃ and 500℃ for 240,480 and 720 hours respeCtively,was studied during tensile tests.The experimental results showed that hydrogen attack decreased AE activity,but the count of high amplitude AE signals increased.The AE signajs originated from intergranular fraCture caused by coalescence of the micro-bubbles or microcracks on the grain boundaries.

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