| GAO Bo,GAO Chao,HE Ji-dong,ZHU Guang-lin,DONG Li-yang,XU Ning.Microstructure Variation and Properties of Pure Titanium Induced by High-current Pulsed Electron Beam[J],46(7):156-160 |
| Microstructure Variation and Properties of Pure Titanium Induced by High-current Pulsed Electron Beam |
| Received:January 11, 2017 Revised:July 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.07.026 |
| KeyWord:pure titanium high current pulsed electron beam crater structure corrosion resistance corrosion current hardness |
| Author | Institution |
| GAO Bo |
School of Metallurgy, Northeastern University, Shenyang , China |
| GAO Chao |
School of Metallurgy, Northeastern University, Shenyang , China |
| HE Ji-dong |
School of Metallurgy, Northeastern University, Shenyang , China |
| ZHU Guang-lin |
School of Metallurgy, Northeastern University, Shenyang , China |
| DONG Li-yang |
School of Metallurgy, Northeastern University, Shenyang , China |
| XU Ning |
School of Metallurgy, Northeastern University, Shenyang , China |
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| Abstract: |
| The work aims to improve corrosion resistance of pure titanium surface. This experiment was completed in two steps. A metallographic sample was firstly prepared, then the sample was modified by high current pulsed electron beam (HCPEB), finally the treated sample was investigated using SEM, XRD, Vickers hardness tester and electrochemical test. The SEM analysis results showed that crater structures appeared on the surface and decreased as pulsed number increased, which was mainly attributed to purification effect of HCPEB. XRD analysis indicated that diffraction peaks were broadened after HCPEB treatment, which confirmed grain refinement on alloy surface after HCPEB treatment. Meanwhile, the peaks shifted to higher angles after HCPEB treatment, which was mainly attributed to decrease of lattice parameter and surface stress. In addition, electrochemical test found that corrosion resistance of the alloy surface increased significantly after HCPEB treatment. Self-corrosion corrosion current density decreased from 27.3 μA/cm2 to 6.3 μA/cm2 by one order of magnitude after being treated by 25 pulses, which was attributed to the purification effect of HCPEB and elimination of crater structures. The microhardness test analysis showed the microhardness decreased significantly since residual stress and crystal twinning were present on sample surface after HCPEB treatment. The corrosion resistance of pure titanium is improved, grain is refined and hardness is decreased by high-current pulsed electron beam(HCPEB) treatment. |
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