交流磁化プローブを用いた鋳造構造物の材質評価


英字タイトル:
Foundry Material Property Evaluation Employing AC Magnetization Probe
著者:
Luca BARTOLOMEO Hisashi ENDO Tetsuya UCHIMOTO Mitsuharu SHIWA Toshiyuki TAKAGI
発刊日:
公開日:
カテゴリ: 第1回
キーワードタグ:

概要

This paper studies a method of non-destructive evaluation for the hardness of ductile cast irons employing an AC magnetization probe that evaluates the differences in magnetization characteristics. The analysis of the waveform obtain ed from the probe on the ductile cast iron specimens performs estimating their hardness since mechanical properties are strongly related to two factors: the graphite shape matrices mainly composed of pearlite and ferrite. The wavefor ms around Rayleigh region yield the essential parameters representing residual flux density, coercive force and hysteresis loss, showing the correlation with the hardness. Moreover, the 3rd harmonic FFT spectrum of detected voltage is considered. The hardness of ductile cast irons can be estimated by using these parameters with good accuracy. Thus, this new type of probe suggests one of the fast-and-quality systems for the maintenance of the foundry structures.


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