NONDESTRUCTIVE EVALUATION OF MECHANICAL PROPERTIES OF DUCTILE CAST IRON PARTS USING EDDY CURRENT SIGNALS

Abstract

The present research investigates improvement of Eddy Current (EC) technique as anondestructive method for measurement of ductile cast iron microstructural and mechanicalcharacteristics. Six samples of heat treated ductile cast iron have been selected to study therelations between pearlite content and EC outputs. These outputs include voltage and normalizedimpedance as well as calculated parameters of harmonic analysis. Furthermore, correlationbetween mechanical properties such as hardness, yield strength and ultimate tensile strength insamples containing different ferrite-pearlite matrices and the magnetic responses has also beenfound. High correlation coefficients of the relations indicate an acceptable level of accuracy incomparison with destructive method.