Development of Supersonic Interference VSM for detecting initial degradation on Nickel based Alloy

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A new magnetic non-destructive evaluation method named as a supersonic interference VSM was developed for detecting initial degradation on Nickel based alloy, which is widely used as structural materials. The measurement method is based on the fact that degradation area shows tiny magnetic property, although original alloy has no magnetism. As the experimental results, the magnetic properties of tiny magnetic materials were measured at the cross points of two supersonic waves which have different frequencies by a trial equipment.Moreover, magnetization processes depending on the distribution of small magnetic materials around degradation region were simulated by Monte Carlo method. The simulation results show the magnetic remanence and coercivity are good correspondences with degradation degrees.The results show the hopeful possibility that the supersonic interference VSM becomes a very useful tool as a new non-destructive evaluation method.