核电厚壁承压容器内壁缺陷TOFD检测优化研究  

Optimization of TOFD Detection for Thick-Walled Nuclear Pressure Vessel with Inner Surface Defect

作　　者：代真[1,2] 王昕[1] 敬尚前[3] 李伟 郝晓军[3] 王磊 

机构地区：[1]中国海洋大学材料科学与工程研究院,山东青岛266100 [2]国电科学技术研究院,南京210031 [3]国网河北省电力公司电力科学研究院,石家庄050021

出　　处：《核动力工程》2014年第2期79-83,共5页Nuclear Power Engineering

基　　金：中国国电集团公司重大科技专项(GDJJ2012[84])

摘　　要：通过分析声波传播特性、检测信号及图像特征,提出20°探头的超声衍射时差法(TOFD)检测模式,并研制20°探头。通过对比5 MHz及2.25 MHz这2种频率下检测效果,进行优化试验。然后通过对不同的内壁模拟缺陷进行检测,制定适合厚壁承压容器内壁缺陷的最佳TOFD检测工艺。试验表明:在核电厂厚壁承压容器内壁缺陷TOFD检测中,20°探头、5 MHz频率是最佳选择;在此检测工艺下,对壁厚120 mm以内的承压容器,能够检出内壁缺陷的最小临界尺寸高为2 mm。The 20° probe is proposed in order to optimize the TOFD detection. Acoustic wave characteristics, detection signal and image feature of 20° probe are analyzed. The oPtimal frequency is determined by comparing 2.25MHz and 5MHz. Through TOFD detection of artificial inner surface defect, the optimum detections are demonstrated, which are fit for detecting thick-walled nuclear pressure vessel with inner surface defect. The experimental results show that： （a） for thick-walled nuclear pressure vessel with inner surface detect, 20~ probe and 5MHz frequency are optimization. （b） By this optimization detection, artificial inner surface defect with height of 2mm can be effectively distinguished in nuclear pressure vessel with thickness of 120mm.

关 键 词：TOFD 检测优化 厚壁 承压容器 细晶材质 内壁缺陷 

分 类 号：TG115.28[金属学及工艺—物理冶金]