Diagnostika lokalizovaného poškození žárupevných ocelí potenciálovou metodou

Abstract

Degradation processes of heat resistant steels are the key factor affecting lifetime of heat resistant components in the industry. The aim of this work is to study changes of electromagnetic properties, that accompany these processes, with respect to design of an electronic measurement device and a technique, which allows to nondestructively acquire these properties and assess remaining lifetime / mechanical properties in fast and reliable manner. Potential drop techniques are used to study electromagnetic properties. Reliability of acquired results is evaluated using statistical comparison with results of more traditional diagnostic techniques. Very good correlation has been found between the magnitude of electrical impedance and state of the microstructure damage evaluated according to VGB TW-507.