Abstract
This article reports that pulse magnetic treatment affects the hardness of 20Cr2Ni4A steel and combs the structure to make it more uniform. According to the experimental requirements, the pulsed magnetic processing system is designed and built, and 1 T, 4 T, 9 T pulsed magnetic processing is applied to the material. The mechanical properties of 20Cr2Ni4A steel before and after magnetic field treatment were quantitatively studied by measuring microhardness and residual stress. XRD and EBSD data are used to analyze the interstitial carbon content and the change of Fe-C comparison. Calculate the dislocation density, and further observe the dislocation structure by TEM. The magnetic domain is characterized by MFM and illustrates the effect of pulsed magnetic treatment on the magnetic domain and dislocations. The results show that the alloy steel has better mechanical properties after pulse magnetic treatment. As the magnetic field intensity increases, the average microhardness increases, and the hardness range is reduced. Different magnetic field treatments reduce the average residual stress of the material, especially after 1 T magnetic field treatment, the average residual stress is reduced by 34.4%, and residual stress distribution is more uniform. The magnetic treatment increases the solute carbon content in the gap of 20Cr2Ni4A steel by about 0.01% and the proportion of α-Fe phase increases. In addition, the magnetic field treatment reduces the dislocation density in the dislocation accumulation area, the proliferation and diffusion of dislocations increase the overall dislocation density. The magnetic domain changes from labyrinth with higher stress to lamellar with lower stress, so stress concentration is weakened and the distribution of residual stress is uniform. This study shows that pulsed magnetic treatment regulates the hardness and residual stress of 20Cr2Ni4A steel, homogenizes the structure of the material and improves the overall performance.
Published Version
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