Interaction Between domain walls and structural defects as a background for magnetic inspection of steel structures

摘要

When a ferromagnetic is magnetized or remagnetized, the magnetization consists of a discrete set of changes in the form of irreversible magnetization steps varying in size (the Barkhausen effect). The Barkhausen steps are closely related to the interaction of domain boundaries with defects of various kinds (pores, inclusions, second-phase segregations, dislocations, grain boundaries, stress gradients, etc.). As the recorded values for the Barkhausen step parameters reflect changes in the structural state in a ferromagnetic, they can be used in non-destructive testing as well as in analyzing the deterioration in properties during use.