DETECTION OF METALLURGICAL AND PRODUCTION DEFECTS IN ENGINEERING COMPONENTS USING METAL MAGNETIC MEMORY

摘要

The main sources of damage during engineering component operation are local stress concentration zones (SCZ) that form under the action of operating loads, and primarily at defects of metallurgical and production operation origin. The size of these SCZ is from several tens of micrometers to several millimetres. However, where these local zones are located and how it is possible to detect them are unknown. The non-destructive monitoring (ultrasound, x-ray, MFD, and others) quality control standards used in manufacturing plants considerably exceed the dimensions of metallurgical defects. A fundamentally new non-destructive monitoring (NM) method is more widespread in practice, based on the use of metal magnetic memory (MMM). It is based on the natural magnetization developed during component manufacture. Possibilities of the MMM method are considered during diagnosis of metallurgical and production defects in new components.