Effect of cyclic loading on the magnetic behavior of hot-rolled pipe steel 08G2B

Abstract

The paper reports on the results of studying the effect of the zero-to-tension cyclic loading, with an amplitude approximately corresponding to conventional yield strength, on the magnetic parameters of the 08G2B hot-rolled pipe steel, including its longitudinal and transverse magnetostriction. The parameters uniquely varying with the number of cycles have been determined, and this principally enables these parameters to be used for the development of nondestructive methods of testing fatigue degradation in the material of structures made of the steel under study. It has been shown that the presence of extrema in the region of positive fields on the field dependences of differential magnetic permeability, the value of the fields at which they are formed, and the magnitude of the extrema allow one to evaluate the strain accumulated in a cyclically loaded product. It has been demonstrated that, as the number of zero-to-tension cycles grows, the field dependences of the longitudinal and transverse magnetostrictions of the steel behave the same way as under static compression.