Eddy Current Examination of Fatigue Cracks in Inconel Welds
Eddy Current Examination of Fatigue Cracks in Inconel Welds
复制标题
铬镍铁合金焊缝疲劳裂纹的涡流检测
DOI：
10.1115/1.2435718
复制
发表时间：
2007
影响因子：
1
通讯作者：
S. Kanemoto
中科院分区：
文献类型：
--
作者：
W. Cheng;I. Komura;M. Shiwa;S. Kanemoto
对用于核电站反应堆容器、稳压器和堆芯内部的典型镍基合金铬镍铁合金涡流检测缺陷进行了基础研究。通过分析和实验研究了涡流法的检测和定径能力。对探头的可探测性进行了数值评价，并相应地选择了合适的探头和检测条件。通过对铬镍铁合金母材电火花加工缺口涡流检测的研究，确定了数值信号计算和裂纹重构方法，并将其进一步应用于铬镍铁合金焊缝疲劳裂纹的涡流检测。利用涡流检测信号重构疲劳裂纹轮廓。涡流重建的裂纹深度与超声检测结果吻合较好，与破坏检测结果一致。本文的研究表明，通过选择合适的检测环境，涡流检测对铬镍铁合金焊缝表面断裂裂纹的检测和确定尺寸是可行的。
Basic studies on the eddy current examination of defects in Inconel, a typical nickel-base alloy used in the reactor vessel, pressurizer, and core internal of nuclear power plants, are carried out. The detecting and sizing capability of the eddy current method is investigated through analytical and experimental approaches. Probe's detectability is numerically evaluated, and appropriate probe and examination conditions are correspondingly selected. The numerical signal calculation and crack reconstruction approach is confirmed in terms of the study of the eddy current examination of electrodischarge machining notches in Inconel base metal, and further applied to eddy current examination of fatigue cracks in Inconel welds. The profiles of fatigue cracks are reconstructed using eddy current testing signals. Crack depths estimated by eddy current reconstruction agree well with that of ultrasonic testing and are consistent with the crack depths revealed from destructive testing. The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for detecting and sizing of surface-breaking cracks in Inconel welds.