Effect of Electron Beam Treatment on the Surface Properties of AZ31B Magnesium Alloy

2012 ◽  
Vol 424-425 ◽  
pp. 1016-1019 ◽  
Author(s):  
Hong Ye ◽  
Rui Chen ◽  
Zhong Lin Yan
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Magnesium Alloy ◽  
High Speed ◽  
Surface Hardness ◽  
Optical Microscope ◽  
Wear Volume ◽  
Az31b Magnesium Alloy ◽  
Pulsed Electron Beam ◽  
Modified Layer

AZ31B magnesium alloy were irradiated by a high current pulsed electron beam (HCPEB) device with pulse times 10, 15 and 20 respectively. The morphology of the surface and cross-section of modified layer were investigated by optical microscope. The corrosion resistance of modified layer were tested by EG&G M273 potentiostat in 5% NaCl solution. Wear resistance were tested by HRS-2 high speed reciprocation frictional testing machines. The results indicated that magnesium alloy surface hardness obviously enhances, the wear volume reduces 7%, the corrosion resistance also improves obviously after electron beam processing.

Study on Surface Modification of Pure Magnesium and Magnesium Alloy with High Current Pulsed Electron Beam

2011 ◽  
Vol 418-420 ◽  
pp. 950-953
Author(s):  
Hong Ye ◽  
Rui Chen ◽  
Zhong Lin Yan
Keyword(s):  
Numerical Simulation ◽  
Electron Beam ◽  
Magnesium Alloy ◽  
Simulation Analysis ◽  
Pure Magnesium ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Modification Process ◽  
Special Surface ◽  
Modified Layer

Pure magnesium and AZ31B magnesium alloy were irradiated by a high current pulsed electron beam (HCPEB) device with pulse times 10, 15 and 20 respectively. The microstructure changes of the surface and modified layer after HCPEB treatment were investigated, and the evolution of temperature field during the electron beam modification process was numerically simulated based on experimental and theories. Numerical simulation analysis is close to experimental results and the special surface morphology arising from treatment is interpreted.

scholarly journals Improvement of Formability and Corrosion Resistance of Az31 Magnesium Alloy by Pulsed Current-assisted Laser Shock Forming

2021 ◽  
Author(s):  
Huixia Liu ◽  
Yuhao Sun ◽  
Youjuan Ma ◽  
Yanchen He ◽  
Xiao Wang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Pulse Current ◽  
Electrochemical Impedance ◽  
Rate Sensitivity ◽  
Optical Microscope ◽  
Laser Shock ◽  
Az31b Magnesium Alloy ◽  
Laser Shock Forming ◽  
Free Bulging

Abstract This study adopted a novel pulse current-assisted laser shock AZ31B sheet micro-forming method (EP-LSF). The mechanism of improving the formability of AZ31B Magnesium Alloy by pulse current assisted laser shock forming and the reason of improving the corrosion resistance were studied for the first time. Through laser shock free bulging experiment, tensile test, optical microscope (OM), and X-ray diffraction, the change in formability was studied. After pulse current assisted laser shock forming, the forming height of AZ31B magnesium alloy increases by 28.8%, the thinning rate decreases by 6.7%, and the strain rate sensitivity coefficient increases to 0.1452. The results show that the decrease of grain size and texture density is the reason why EP-LSF can further improve the formability of AZ31B magnesium alloy. The changes in corrosion resistance were studied by scanning electron microscopy and electrochemical tests. The results show that after EP-LSF, the corrosion current density of AZ31 magnesium alloy decreased, and the electrochemical impedance increased, indicating that this method further improved the corrosion resistance.

scholarly journals Surface Alloying and Improved Property of Nb on TC4 Induced by High Current Pulsed Electron Beam

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2906
Author(s):  
Xueze Du ◽  
Nana Tian ◽  
Conglin Zhang ◽  
Peng Lyu ◽  
Jie Cai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
Surface Hardness ◽  
High Current ◽  
X Ray Diffraction ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
Tc4 Alloy ◽  
Nb Alloying

In this paper, an Nb alloying layer on a TC4 alloy was fabricated by using high-current pulsed electron beam (HCPEB) irradiation to improve surface performance. X-ray diffraction (XRD), optical microscopy (OM), laser surface microscope (LSM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the phase composition and microstructure of the surface layer. The microhardness, wear tests and corrosion resistance were also examined. The results show that after HCPEB alloying, a Nb-alloyed layer was formed with about 3.6 μm in thickness on the surface of the sample, which was mainly composed of α’-Ti martensite, β-Ti equiaxial crystals, and NbTi4 particles. After HCPEB irradiation, the surface hardness, wear resistance and corrosion resistance of Nb alloying layer on TC4 alloy were improved compared to the initial samples.

Crater Eruption Induced by High Current Pulsed Electron Beam (HCPEB) Treatment

2010 ◽  
Vol 654-656 ◽  
pp. 1700-1703 ◽  
Author(s):  
Thierry Grosdidier ◽  
Xiang Dong Zhang ◽  
Jiang Wu ◽  
Nathalie Allain-Bonasso ◽  
Ke Min Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Surface Properties ◽  
Nucleation And Growth ◽  
Corrosion And Wear ◽  
Crater Formation ◽  
High Current ◽  
Negative Effects ◽  
Pulsed Electron Beam ◽  
Potential Formation

High current pulsed electron beam (HCPEB) is a fairly new technique for improving surface properties such as corrosion and wear resistances. One of the negative effects induced by HCPEB is the potential formation of craters on the surface of the HCPEB treated materials. These changes can impair the corrosion-resistance by promoting pitting. The mechanisms of nucleation and growth are detailed and the effect of the number of pulses on crater formation is discussed.

Influence of Electron Beam Pulsed Times on the Properties of 40Cr

2010 ◽  
Vol 154-155 ◽  
pp. 1170-1177
Author(s):  
Yuan Fang Chen ◽  
Xiao Dong Peng ◽  
Jian Jun Hu ◽  
Hong Bin Xu ◽  
Chan Hao
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
High Current ◽  
Wear Properties ◽  
X Ray ◽  
Pulsed Electron Beam ◽  
Surface Microstructures ◽  
40Cr Steel

Surface modification of 40Cr steel by high current pulsed electron beam has been investigated . The pulsed times of HCPEB was changed from 1 to 25 to prepare different specimens. Surface microstructures and section microstructures after HCPEB irradiation were detected by using metallurgical microscope, SEM and X-ray diffractometer. It is shown that crater defects were found on the surface after the irradiation of HCPEB and the density of craters will decrease with increasing pulses times. When treated by 27Kev accelerating voltage, with increasing pulse times, the particles located in surface layer were obviously refined .The surface roughness, hardness, wear properties and corrosion resistance were analyzed after irradiation of HCPEB. The wear resistance and corrosion resistance were obviously enhanced after 10 pulses treatment.

scholarly journals Acceleration of Plasma Nitriding at 550 °C with Rare Earth on the Surface of 38CrMoAl Steel

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1122
Author(s):  
Dongjing Liu ◽  
Yuan You ◽  
Mufu Yan ◽  
Hongtao Chen ◽  
Rui Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Electron Microscope ◽  
Weight Gain ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Optical Microscope ◽  
Steel Microstructure ◽  
Transmission Electron ◽  
Modified Layer

In order to explore the effect of the addition of rare earth (RE) to a steel microstructure and the consequent performance of a nitrided layer, plasma nitriding was carried out on 38CrMoAl steel in an atmosphere of NH3 at 550 °C for 4, 8, and 12 h. The modified layers were characterized using an optical microscope (OM), a microhardness tester, X-ray diffraction (XRD), a scanning electron microscope (SEM), a transmission electron microscope (TEM), and an electrochemical workstation. After 12 h of nitriding without RE, the modified layer thickness was 355.90 μm, the weight gain was 3.75 mg/cm2, and the surface hardness was 882.5 HV0.05. After 12 h of RE nitriding, the thickness of the modified layer was 390.8 μm, the weight gain was 3.87 mg/cm2, and the surface hardness was 1027 HV0.05. Compared with nitriding without RE, the ε-Fe2-3N diffraction peak was enhanced in the RE nitriding layer. After 12 h of RE nitriding, La, LaFeO3, and a trace amount of Fe2O3 appeared. The corrosion rate of the modified layer was at its lowest (15.089 × 10−2 mm/a), as was the current density (1.282 × 10−5 A/cm2); therefore, the corrosion resistance improved.

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