P91钢焊缝蠕变超声检测的敏感参数选择

发布时间：2019-01-16 02:02

【摘要】：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。
[Abstract]:In this paper, 172 sensitive parameters of creep ultrasonic testing for P91 steel welds are studied. Four kinds of ultrasonic probes in 2~15MHz frequency band are used to carry out ultrasonic testing experiments. The measured values of attenuation, sound velocity, noise power, spectrum characteristics and nonlinear characteristics in different positions of heat affected zone of P91 weld are calculated. By using the normalized cluster analysis method, the parameters of ultrasonic testing are classified and analyzed, and the creep metallography of the weld seam of P91 steel is compared with that of the actual steel. The first kind of testing parameters have the potential to be sensitive parameters for ultrasonic creep testing of P91 steel welds. A method for calculating the sensitivity of creep ultrasonic testing parameters is defined, and the first kind of parameters are screened by this method. The screening results show that four ultrasonic parameters can be used as sensitive parameters for creep detection of P91 steel welds. The nonlinear parameters of 15MHz probe and 2MHz probe have high detection sensitivity. The results show that it is necessary to select suitable sensor combination and select sensitive parameters in ultrasonic testing of weld creep of P91 steel.
【作者单位】：清华大学机械工程系先进成形制造教育部重点实验室;
【分类号】：TG441.7

【共引文献】