電磁超音波-渦電流複合プローブを用いた鋳鉄の非破壊材質評価

概要

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Cast iron is a useful engineering material due to its excellent mechanical properties. And the mechanical properties of cast irons strongly depend on the graphite morphology and the matrix structure, thus both of them should be evaluated for their characterization. The former can be evaluated by ultrasonic testing (UT), and the latter can be evaluated by eddy current testing (ECT). Considering the background above, this study proposes a novel method for the material characterization of cast irons with an EMAT/EC dual probe. For this purpose, we conduct UT and ECT for cast irons with different graphite morphology and matrix structures with the proposed probe. As a result, EMAT mode of the probe obtains the correlation between the nodularity of graphite and ultrasonic velocity. In addition, ECT mode of the probe obtains the correlation between the pearlite ratio and EC signals. And the equivalent results can be obtained with the conventional methods. These results imply that the EMAT/EC dual probe is effective for the material characterization of cast irons.
2010-07-25