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Creep-fatigue damage and life prediction in P92 alloy by focused ultrasound measurements

机译：聚焦超声测量P92合金的蠕变疲劳损伤和寿命预测

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In the present study, the characteristics of creep damage in P92 alloy were investigated via nondestructive evaluation. Generally, as the hold time of a static load increases, the degradation of the material becomes more severe along with a reduction of service life. Therefore, in power plants, the reduction of creep-fatigue strength and the creep-fatigue life of high pressure vessels at high temperatures, such as steam pipes, become very important. To evaluate the effect of damage, backscattering ultrasound signals were analyzed from creep-fatigue specimens, where both static and cyclic loads had been applied simultaneously. The testing temperature trapezoidal creep-fatigue loading wave shapes with hold times ranging from 0 s to 1000 s at the maximum load were employed. The results obtained from bulk waves of focused ultrasound were compared and analyzed with the experimental parameters. The relationships between these parameters, the RMS level of backscattering signals, and the area fraction of the cavity in the creep-fatigue damage zone were investigated to evaluate the lifetime of the damaged specimens.
机译：在本研究中，通过无损评估研究了P92合金的蠕变损伤特征。通常，随着静载荷的保持时间增加，材料的降解变得更严重，并且使用寿命缩短。因此，在发电厂中，降低高温容器如蒸汽管的蠕变疲劳强度和蠕变疲劳寿命变得非常重要。为了评估损伤的影响，分析了蠕变疲劳样本的反向散射超声信号，该样本同时施加了静载荷和循环载荷。测试温度梯形蠕变疲劳载荷波形在最大载荷下的保持时间为0 s至1000 s。从聚焦超声的体波获得的结果进行了比较，并与实验参数进行了分析。研究了这些参数，反向散射信号的RMS电平以及蠕变疲劳损伤区中空腔的面积分数之间的关系，以评估损伤标本的寿命。

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