Effect of applied load and thermal treatment on the magnetic memory signal of defect-bearing Q345R steel samples

Abstract

Herein, the effects of external loading and heat treatment on magnetic memory field parameters were studied for Q345R steel samples with defects of different width and depth, and a quantitative relationship between the magnetic memory signal and defect size was established. On this basis, we characterized the changes in defect magnetic memory signals at different loading stages and studied the variation in defect magnetic field parameters before and after heat treatment. The obtained results showed that load application increased the magnetic memory field parameters within a certain range, while these parameters significantly decreased upon heat treatment. Therefore, in addition to determining magnetic field parameters, other important factors such as the quantitative relationships between magnetic field parameters and defect size, applied load, and heat treatment state must be considered for accurate defect characterization.