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Austempered Ductile
Iron (ADI) is noted for its combination of high
strength and wear resistance. In recent years, much
attention has been paid to ADI as a prominent material
for reducing weights and costs of automobile components.
Usually, ADI shows poor machinability, due to strain-induced
transformation of the retained austenite.
If its is possible
to measure the amount of retained austenite before
machining, we can prevent the chipping of cutting
tools. For measurement of the amount of retained
austenite, X-ray diffraction is the only method
capable of giving an absolute value, by it can not
be applied to the non-destructive quantitative analysis
of castings.
However, we found a
strong relationship between the amount of retained
austenite and the induced voltage in the AC magnetization
method.
A retained austenite
meter on the basis of this method is used for inspection
of ADI rotors for automotive air conditioning compressors.
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