Abstract
In this paper, the changes of surface morphology, microstructure, hardness and corrosion resistance of industrial pure zirconium before and after surface modification by high current pulsed electron beam were discussed. The microstructure evolution and surface morphologies of the samples were characterized by using X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM). The experimental results show that sample by high current pulsed electron beam treatment surface melting, martensitic phase transformation occurred, and volcanic crater morphology and fine microstructure in the remelted layer surface; with the increase of number of pulses, after processing the microhardness of the samples also with the increase, 15-pulsed sample microhardness than the original sample increased by 30.9%. Corrosion resistance of samples was studied with the impedance diagram and polarization curve. The electrochemical results show that corrosion resistance of samples by high current pulsed electron beam treatment presents different degrees of change, the 5-pulsed sample in 1 mol HNO3 solution corrosion of the best, and 15-pulsed sample corrosion resistance is even lower than the original sample. Grain refinement, martensite transformation, dislocation and deformation twins are the main reasons for improving the micro hardness and corrosion resistance of the samples.
Highlights
Pure zirconium is composed of 99.2% - 99.9% zirconium + hafnium
The experimental results show that sample by high current pulsed electron beam treatment surface melting, martensitic phase transformation occurred, and volcanic crater morphology and fine microstructure in the remelted layer surface; with the increase of number of pulses, after processing the microhardness of the samples with the increase, 15-pulsed sample microhardness than the original sample increased by 30.9%
The electrochemical results show that corrosion resistance of samples by high current pulsed electron beam treatment presents different degrees of change, the 5-pulsed sample in 1 mol HNO3 solution corrosion of the best, and 15-pulsed sample corrosion resistance is even lower than the original sample
Summary
Pure zirconium is composed of 99.2% - 99.9% zirconium + hafnium. It has been widely used in severely corrosive environments as structural material because of its excellent corrosion resistance. In the strong flow pulse electron beam irradiation process, the surface of the substrate can reach very high energy density (108 - 109 W/cm2) in a very short period of time, resulting in a high temperature melting of the surface heating and evaporation, followed by rapid cooling [4] [5]. Further improve the mechanical properties of zirconium metal and corrosion resistance and prolong the service life, reduce maintenance costs, has become an important issue, and electron beam surface modification technology plays an important role in promoting. The purpose of this experiment is to study the influence of pulse electron beam treatment on the surface morphology, microstructure, micro hardness and corrosion resistance of zirconium [6] [7]
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