Estimation method of yield strength of ferromagnetic materials based on pulsed eddy current testing

Abstract

In the current production of iron and steel industry, the testing of mechanical properties of ferromagnetic materials relies on tensile testing, which is time-consuming and destructive, thus greatly increasing the production cost. In order to solve this problem, a method based on pulsed eddy current is proposed to estimate the yield strength of ferromagnetic materials. Eddy current loss and hysteresis loss are the sources of loss in the magnetization process of ferromagnetic materials. Not only the loss but also the yield strength of the material is related to the microstructure of the magnetized material. In this paper, the relationship between loss in the process of magnetization and microstructure of materials is analyzed. The features of eddy current loss and hysteresis loss were found from the pulsed eddy current signals, and the yield strength evaluation model was established by feature fitting. The experimental results show that the model has high evaluation accuracy.