PROBLEM TO BE SOLVED: To provide a carburizing layer detecting method capable of easily detecting a carburizing layer.;SOLUTION: An ultrasonic flaw detector 10 is constituted so as to bring a probe T on a transmission side and a probe R on a receiving side into contact with the surface 11 of a test target 30 to detect the flaw of the test target 30. The probe T on the transmission side emits pulses 41a and 42a easy to cause horizontal wave/longitudinal wave mode conversion with respect to the test target 30 and the probe R2 on the receiving side receives the mode conversion pulses 41c and 42c subjected to mode conversion from the base 13 of the test target 30. The probe R1 on the receiving side receives the mode conversion pulses 41b and 42b subjected to mode conversion from the boundary surface 45 with the carburizing layer 25. The carburizing layer 25 is detected from the distances between the probe T on the transmission side and the probes R1 and R2 on the receiving side and the distance of the base mode conversion pulses and the boundary surface conversion pulses.;COPYRIGHT: (C)2006,JPO&NCIPI
展开▼
