Effect of pulsed magnetic field treatment on the residual stress of 20Cr2Ni4A steel

Abstract

Abstract To study the effect of a pulsed magnetic field on the residual stress of 20Cr2Ni4A steel, the material was treated for 120 s with a 1 T pulsed magnetic field. The microstructure of the materials was studied using residual stress measurement, transmission electron microscopy (TEM) observations, X-ray diffraction analysis, and magnetic domain observations. Experimental results revealed that the residual stress of the 1 T sample was reduced by 14.26% compared with that of the 0 T sample. The results show that the residual stress is effectively reduced by the pulsed magnetic field. The mechanism of magnetic field action involves improving the flexibility of dislocation movement, proliferating and entangling the dislocation structure, and inducing slippage. During the pulsed magnetic treatment, the labyrinth domain with larger stress changes to a lamellar domain with less stress and the residual stress decreases.