Non-destructive Eddy Current technique has long been used to detect discontinuities in materials. Although, recently, its application has been extended to separated and characterize materials microstructure. Based on different electromagnetic responds of materials with different microstructures, the present paper studies the ability of Eddy Current method to separate unwanted parts resulting from improper heat treatment cycles. In order to separate the microstructures, the responses resulting from current induction in 1045 mild steel samples with different microstructures were studied. The results show the high accuracy of the non-destructive eddy current method in separation of different microstructures resulting from various heat treatment applications. The results show that eddy Current non-destructive technique could be used in on–line separation of undesired microstructure in mass production heat treatment lines.

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