Detection of local stress concentration zones in engineering components – the lacking link in the NDT system

Ladanyi, Peter; Interproject Europe Ktf.; Hungary

Dubov, An.A.; Energodiagnostika Co. Ltd; Russia
Trampus, P.; University of Dunaujvaros; Hungary
Ladanyi, P.; Interproject Europe Ktf; Hungary

ID: ECNDT-0239-2018
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Session: Material Characterisation Metal Magnetic Memory
Room: R2
Date: 2018-06-12
Time: 09:00 - 09:20

It is known that the main sources of damage during operation of engineering components are local stress concentration zones (SCZs) that are formed under the action of workloads primarily on defects of metallurgical and process nature. Sizes of these stress concentration zones vary from several tens of microns to several millimeters. Furthermore, it is unknown where these local areas are situated and how they can be detected. At the same time the reject norms of the applied NDT methods (ultrasonic testing, X-ray, MPI and other methods) at manufacturing plants significantly exceed the sizes of metallurgical defects.
At present a fundamentally new NDT method based on the use of the magnetic memory of metal (MMM) is more and more commonly applied in practice. It uses the natural magnetization formed during the components’ fabrication. The results are based on resent experiences.
The article considers the capabilities of the MMM method during the diagnostics of metallurgical and process manufacturing defects in new components.