Apart from traditional application of nondestructive eddy current technique for detection of discontinuities, the method has been recently used to determine physical and metallurgical properties of steel parts. In the present research the application of eddy current method for determination of surface carbon of steel parts in gas carburizing process has been studied. The relation between the surface carbon content and various parameters such as impedance, phase angle and voltage has been established. Besides the effect of carbon content of the impedance plain has been investigated. The study shows that the best relation (R2 = 0.91) can be achieved using phase angle.

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