Effect of transitions of domain boundaries in plastically deformed steels on their residual magnetization

The values of internal stresses σ i that determine the maximum of the dependence of differential permeability μ d ( H ) have been obtained as well as the limiting value of the angle between highand low-angle grain boundaries. When analyzing 90-degree transitions, singular points have been discovered that separate domains with different values of critical magnetization-reversal fields. This has made it possible to calculate the values of all magnetizations, including easy-plane (EP), residual, and “reverse” ones (in the area of positive magnetic-field values). The results open up possibilities for conscious choice of the field ranges for excitation of irreversible 90-degree transitions with known values of σ i . The latter can serve as the basis for developing new techniques of nondestructive testing.