Abstract
A nondestructive inspection of a heat-damaged layer was performed by a Scanning Acoustic Microscope (SAM). The 2-dimensional V(z) characteristic was obtained by moving the acoustic lens in a longitudinal direction interlinking its movement to the horizontal scanning. Both the Rayleigh wave velocity and the total reflection power were calculated from the waveform analysis of the V(z) function. From the experiments using 550C steel, we found that the damage in the martensitic and beilbee layers caused by a significant grinding burn, can be easily evaluated by the Rayleigh wave velocity. On the other hand, the damage in the over-tempered layer underneath the beilbee layer can be evaluated by the total reflection power.
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