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概要

Evaluation of defect and damage for structural materials of energy device was performed by using ectromagnetic techniques. For degradation of thermal aging magnetic characterization of weld specimens HCM12A was performed. Comparing the specimen aged at 550°C for 2000 hours with that aged at D0°C for 600 hours, it was found that the changes in magnetic flux densities was clearly observed near the eld metal and heat affected zone for the specimen aged at 550°C for 2000 hours. Then the degree of egradation for weld specimen could be evaluated by the changes of magnetic flux densities. For egradation of defect and crack changes in leakage magnetic flux densities around surface defect of SS400 ere measured by fluxgate sensor. And by using inverse analysis of Tikhonov regularization, magnetic marge distribution of defect was calculated from the measured leakage magnetic flux densities and the efect size was successfully reconstructed.

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