Yasubumi Furuya1, Heihachi Shimada1 and Koji Arato2
1Materials Processing, Faculty of Engineering, Tohoku University, Sendai
Advanced magnetic non-destructive measurement technique, the ``Barkhausen noise (BHN) analysis'' method, is employed for the material evaluation of the spheroidal graphite cast iron. BHN signal is detected by a contact type sensor setted on the surface of plate specimen and analyzed by a digital spectrum analyzer. It is experimentally confirmed that (1) BHN generating power(PWA) depends on the graphite content (i.e.area fraction of graphite, FA) of the material and (2) average spheroidal graphite size (i.e.diameter \barr) can be estimated by a parameter of normalized BHN spectrum peak height (Hp). Moreover, combining brinell hardness (HB) with BHN signal, some correlation can be obtained between mechanical tensile strength ( σ UTS) and a parameter φ=(PWA) × (hardness, HB).
In consequence, the BHN method is also applicable for the non-destructive material evaluation of graphite cast iron and useful information about material properties seems to be obtained by this method.
spheroidal graphite cast iron, Barkhausen noise measurement, spectrum analysis, magnetic nondestructive testing, material evaluation
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