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针对P91钢焊缝蠕变检测问题,对172个蠕变超声检测敏感参数进行了研究。使用2~15MHz频带范围的4种超声探头进行超声检测实验,计算了衰减、声速、噪声功率、频谱特征、非线性特征等参数在P91焊缝热影响区不同位置的测量值。应用归一化聚类分析方法,对上述超声检测参数进行了归类分析,通过与实际P91钢焊缝蠕变金相的对比,确定了第一类检测参数具有作为P91钢焊缝超声蠕变检测敏感参数的潜力。定义了一种蠕变超声检测参数灵敏度的计算方法,利用该方法对第一类检测参数进行了筛选。筛选结果表明:有4种超声检测参数可以作为P91钢焊缝蠕变检测的敏感参数。其中,15MHz探头发射、2MHz探头接收时的非线性参数具有较高的检测灵敏度。研究结果表明,P91钢焊缝蠕变的超声检测中,需要选用合适的传感器组合和选择灵敏度较高的检测参数。
Aiming at the creep detection problem of P91 steel weld, 172 sensitive parameters of creep ultrasonic testing were studied. Four kinds of ultrasonic probes in the frequency range of 2 ~ 15MHz were used for ultrasonic testing. The measured values of attenuation, sound velocity, noise power, spectral characteristics, nonlinear characteristics and other parameters were calculated at different positions in the heat affected zone of weld P91. The normalized clustering analysis method was used to classify and analyze the ultrasonic testing parameters. By comparing with the creep microstructure of the actual P91 steel, the first type of testing parameters were determined as ultrasonic creep Detect the potential of sensitive parameters. A method for calculating the sensitivity of creep ultrasonic testing parameters is defined. The first type of testing parameters are selected by this method. The screening results showed that there are four kinds of ultrasonic testing parameters can be used as P91 steel weld creep detection of sensitive parameters. Among them, 15MHz probe launch, 2MHz probe receiver nonlinear parameters with high detection sensitivity. The results show that the ultrasonic testing of the weld creep of P91 steel requires the selection of suitable sensor combinations and the selection of higher sensitivity test parameters.