发电机护环晶粒度对超声相控阵检测的影响  

Effect of Grain Size of Generator Guard Ring on Ultrasonic Phased Array Detection

作　　者：刘明星 周家伟 LIU Mingxing;ZHOU Jiawei(Datang boiler and Pressure Vessel Inspection Center Co.,Ltd.,Hefei 230088,Anhui China;East China Branch,China Datang Corporation Science and Technology Research Institute Co.,Ltd.,Hefei 230088,Anhui China)

机构地区：[1]大唐锅炉压力容器检验中心有限公司,安徽合肥230088 [2]中国大唐集团科学技术研究总院有限公司华东电力试验研究院,安徽合肥230088

出　　处：《热处理》2024年第3期52-55,59,共5页Heat Treatment

摘　　要：检测了晶粒度不同的发电机护环1和2的超声波声速、超声波声能衰减和超声信噪比.研究了晶粒度对护环超声相控阵检测效果和检测灵敏度的影响.结果表明:晶粒度越大,护环的超声波声速越小,超声波信号衰减越严重,超声信噪比越小,超声波声能的衰减和超声信噪比对超声波频率也越敏感;护环晶粒度越小,超声相控阵检测效果越好,检测灵敏度越高.The ultrasonic speed,ultrasonic energy attenuation and ultrasonic signal-to-noise ratio of the generator guard rings 1 and 2 which differed in grain size were detected.The influence of grain size on the ultrasonic phased array detection effect and the detection sensitivity was investigated.The results showed that(a)the larger the grain size,the lower the ultrasonic speed of the guard ring was,the more serious the ultrasonic signal attenuation was,the less the ultrasonic signal-to-noise ratio was,and the more sensitive the ultrasonic energy attenuation and ultrasonic signal-to-noise ratio was to the ultrasonic frequency;and(b)the smaller the grain size of the guard ring,the better the ultrasonic phased array detection effect was,and the higher the detection sensitivity was.

关 键 词：护环 晶粒度 衰减 相控阵 灵敏度 

分 类 号：TB559[理学—物理]