Numerical simulation on magnetic–mechanical behaviors of 304 austenite stainless steel

Abstract

A magnetic–mechanical coupling model of elastic and plastic stages was established. Stress and strain distributions and magnetic field signals of 304 austenite stainless-steel specimens were simulated through finite element method during uniaxial tension. Micromagnetic measurements and X-ray diffraction tests were performed to verify the variation laws of stress and residual plastic strain of 304 austenite stainless steel with magnetic field signals. Results demonstrate a positive correlation between the surface magnetic induction intensity and tensile stress in the elastic stage. The magnetization in the stage of plastic deformation is related to the strain and induced martensite content. With the increase in strain, induced martensite content increases, and the surface magnetic induction intensity decreases rapidly and then increases greatly. The difference of magnetic field signals in different deformation states is expected to be applied to the damage monitoring of 304 stainless steel.