scholarly journals Nanocrystallization of Coarse Primary Phases in Al- and Mg-Based Alloys Induced by HCPEB Treatment

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Gao Bo ◽  
He Jidong ◽  
Tu Ganfeng ◽  
Hu Liang
Keyword(s):  
Primary Phase ◽  
High Current ◽  
Nanostructured Surface ◽  
Surface Layers ◽  
Pulsed Electron Beam ◽  
Surface Nanocrystallization ◽  
Modified Surface ◽  
Multiple Pulses ◽  
And Diffusion ◽  
Modified Surface Layer

This paper reports on a phenomenon associated with high-current pulsed electron beam (HCPEB) treatment: surface nanocrystallization of coarse primary phase in hypereutectic Al17.5Si and quasicrystal alloys after multiple pulses of HCPEB irradiation. The HCPEB treatment induces superfast heating and diffusion of alloying elements and heterogeneous nucleation in a melting solution, followed by rapid solidification and cooling of the material surfaces. Consequently, nanostructured surface layers can be achieved easily. Nano-Si phase and nano-quasicrystal phase formation on the modified surface layer of hypereutectic Al17.5Si alloy and quasicrystal alloy (Mg37Zn60Y3) show a potential for surface nanocrystallization of materials with enhanced properties by HCPEB treatment.

Surface Microstructure and Corrosion Resistance of 316L Stainless Steel after High Current Pulsed Electron Beam Treatment

2007 ◽  
Vol 561-565 ◽  
pp. 2381-2384 ◽  
Author(s):  
Sheng Zhi Hao ◽  
Ping Sheng Wu ◽  
Thierry Grosdidier ◽  
Chuang Dong
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
High Current ◽  
X Ray ◽  
Pulsed Electron Beam ◽  
Modified Surface ◽  
Working Parameters ◽  
Refinement Effect ◽  
Modified Surface Layer

HCPEB treatment of 316L stainless steel (SS) was carried out and the microstructure change in the modified surface layer were characterized with optical microscopy and X-ray diffractometry techniques. The evolution regularity of surface craters and grain refinement effect, as well as the preferred orientation of (111) crystal plane occurring in the HCPEB treatment at different working parameters were discussed combining with their influence on corrosion resistance.

scholarly journals Formation of Surface Nano- and Textured Austenite Induced by Pulsed Electron Beam Irradiation under Melting Mode

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
K. M. Zhang ◽  
J. X. Zou
Keyword(s):  
Electron Beam ◽  
Niti Alloy ◽  
Austenite Formation ◽  
Surface Layers ◽  
Interesting Phenomenon ◽  
Pulsed Electron Beam ◽  
Aisi D2 ◽  
Modified Surface ◽  
D2 Steel ◽  
Modified Surface Layer

We report in this paper an interesting phenomenon associated with low-energy high-current pulsed electron beam (LEHCPEB) treatment: surface nanograined and textured austenite formation under the melting treatment mode. The treatment induces superfast heating and melting followed by a rapid solidification and cooling of the material surfaces. As a result, nano-structured surface layers can be achieved quite easily. Examples of nanoaustenite formation with special texture state in the modified surface layer of AISI D2 steel and NiTi alloy will show the potential for surface nanocrystallization of materials with improved properties by LEHCPEB technique.

Influence of High Current Pulsed Electron Beam (HCPEB) Treatment on Wear Resistance of Hypereutectic Al-17.5Si and Al-20Si Alloys

2011 ◽  
Vol 675-677 ◽  
pp. 693-696 ◽  
Author(s):  
Y. Hao ◽  
Bo Gao ◽  
Gan Feng Tu ◽  
Z. Wang ◽  
Sheng Zhi Hao
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Electron Beam ◽  
Supersaturated Solid Solution ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Primary Si ◽  
Modified Surface ◽  
Positive Effect ◽  
Modified Surface Layer

The paper reports an analysis of the effect of high current pulsed electron beam(HCPEB) on microstructure transformations and wear resistance of hypereutectic Al-Si alloys. HCPEB treatment with 2.5 J /cm2 energy density leads to the formation of “halo” centered on primary Si, composition homogeneity, the formation of supersaturated solid solution of Al and grain refinement of top melted surface layer. The wear resistance of 15 pulse-treated Al-17.5Si and Al-20Si alloys is drastically improved by a factor of 6.5 and 2, respectively. The increase of hardness in modified surface layer has a positive effect on wear of hypereutectic Al-Si alloys.

High-Current Pulsed Electron Treatment of Hypoeutectic Al–10Si Alloy

2017 ◽  
Vol 36 (1) ◽  
pp. 97-100 ◽  
Author(s):  
Lu Diankun ◽  
Gao Bo ◽  
Zhu Guanglin ◽  
Lv Jike ◽  
Hu Liang
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Beam Energy ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Surface Nanocrystallization ◽  
Primary Si ◽  
Beam Energy Density ◽  
Eutectic Si ◽  
First Time

AbstractThis paper reports, for the first time, an analysis of the effect of high-current pulsed electron beam (HCPEB) on a hypoeutectic Al–10Si alloy. The Al–10Si alloy was treated by HCPEB in order to see the potential of this fairly recent technique in modifying its wear resistance. For the beam energy density of 3 J/cm2 used in the present work, the melting mode was operative and led to the formation of a “wavy” surface and the absence of mass primary Si phase and eutectic microstructure. The surface nanocrystallization of primary and eutectic Si phases led to the increase in macro-hardness of the top surface layer, and the wear resistance was drastically improved with a factor of 4.

Formation of Gradient Multiphase Nanostructured Surface Layers Using the Electron-Ion-Plasma Combined Method

2015 ◽  
Vol 756 ◽  
pp. 236-242 ◽  
Author(s):  
Yuriy F. Ivanov ◽  
Anton D. Teresov ◽  
Olga V. Ivanova ◽  
Victor E. Gromov ◽  
Evgeniy A. Budovskikh ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Subsequent Treatment ◽  
Nanostructured Surface ◽  
Combined Method ◽  
Surface Layers ◽  
Pulsed Electron Beam ◽  
Mechanical And Tribological Properties ◽  
Ion Plasma ◽  
Defect Substructure ◽  
Mechanical And Tribological Characteristics

The data of the study of the elemental and phase composition, the condition of the defect substructure, mechanical and tribological characteristics of titanium alloy VT6 subjected to electroexplosive carburization with a sample of titanium diboride powder and the subsequent treatment by high-intensity pulsed electron beam is presented. It has been established that the main mechanisms responsible for an increase in the mechanical and tribological properties of the material are solid, dispersion, and grain boundary.

Effect of High-Current Pulsed Electron Beam Processing of Zr-1%Nb Alloy on Its Oxidation Kinetics at 1200C in Air and Steam

CORROSION ◽  
10.5006/3942 ◽  
2021 ◽  
Author(s):  
Mikhail Slobodyan ◽  
Konstantin Ivanov ◽  
Maxim Elkin ◽  
Vasiliy Klimenov ◽  
Sergey Pavlov ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Current ◽  
Surface Layers ◽  
Research Directions ◽  
Temperature Oxidation ◽  
Pulsed Electron Beam ◽  
Electron Beam Processing ◽  
Heating And Cooling ◽  
Loss Of Coolant ◽  
Kinetics Of

The paper reports the effect of high-current pulsed electron beam (HCPEB) processing of the Zr-1%Nb alloy, as one of the most widely used in water-cooled nuclear reactors, on the kinetics of its oxidation at 1200 °C in air and steam (these conditions are typical for potential loss-of-coolant accidents). It was shown that HCPEB processing caused a change in the surface morphology of the samples. In particular, craters with diameters of about 100 μm were found on the modified surfaces. They had initiated at an energy density of 5 J/cm2 and were characterized by relevant reliefs with microcracks. After HCPEB processing at 10 J/cm2, the craters were deeper with fractured surface layers. In addition, a pronounced surface relief corresponding to quenched martensitic microstructures was observed on the modified sample surfaces that had formed due to high heating and cooling rates. Due to sufficient degradation of the sample surfaces after HCPEB processing at 10 J/cm2, the kinetics of high-temperature oxidation was estimated only for the as-received samples and ones treated at 5 J/cm2. It was found that the as-received samples showed slightly greater weight gain levels in both air and steam environments, which fully correlated with the thickness ratio of the oxide, α-Zr(O) and prior-β layers. These phenomena and further research directions were discussed.

Nanostructure of 45# Carbon Steel by High Current Pulsed Electron Beam

2009 ◽  
Vol 79-82 ◽  
pp. 317-320
Author(s):  
Hui Zou ◽  
H.R. Jing ◽  
Sheng Zhi Hao ◽  
Chuang Dong
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Electron Microscope ◽  
Carbon Steel ◽  
Short Pulse ◽  
White Layer ◽  
High Current ◽  
Near Surface ◽  
Pulsed Electron Beam ◽  
Modified Surface

When high current pulsed electron beam (HCPEB) transferring its energy into a very thin surface layer within a short pulse time, super fast processes such as heating, melting, evaporation and consequent solidification, as well as dynamic stress induced may impart the surface layer with improved properties. In this paper, HCPEB modification of 45# carbon steel with working parameters of electron energy 25 kV, pulse duration 3.5µs, and energy density 4 J/cm2 was investigated. The microstructures of modified surface were analyzed by scanning electron microscope (SEM) of type JSM 5310 and transmission electron microscope (TEM) of type H-800. It is found that the modified surface layer can be divided into three zones: the white layer or melted layer of depth 3 to10µm, the heat and stress effecting zone 10 µm below and about 250 µm, then matrix, where a nanostructure and/or amorphous layer formed in the near-surface region. It is proved that the whole treatment process is not complex and cost-effective, and has a substantial potential to be applied in industries.

scholarly journals Halo Evolution of Hypereutectic Al-17.5Si Alloy Treated with High-Current Pulsed Electron Beam

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
L. Hu ◽  
B. Gao ◽  
J. K. Lv ◽  
S. C. Sun ◽  
Y. Hao ◽  
...  
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Electron Beam ◽  
Alloy Surface ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Relative Wear Resistance ◽  
Multiple Pulses ◽  
Diffraction Peaks ◽  
Bull's Eye

Halo evolution of an Al-17.5Si alloy surface after treatment with increasing pulse numbers of a high-current pulsed electron beam (HCPEB) was investigated. A halo is a ring microstructure resembling a bull’s eye. SEM results indicate that the nanocrystallization of halo induced by HCPEB treatment leads to gradual diffusion of the Si phase. Multiple pulses numbers cause the Si phase to be significantly refined and uniformly distributed. In addition, nanosilicon particles with a grain size of 30~100 nm were formed after HCPEB treatment, as shown by TEM observation. XRD results indicate that Si diffraction peaks broadened after HCPEB treatment. The microhardness tests demonstrate that the microhardness at the midpoint from the halo edge to center decreased sharply from 9770.7 MPa at 5 pulses to 2664.14 MPa at 25 pulses. The relative wear resistance of a 15-pulse sample is effectively improved by a factor of 6.5, exhibiting optimal wear resistance.

The effect of a low-energy high-current pulsed electron beam on surface layers of porous zirconium ceramics

2014 ◽  
Vol 40 (9) ◽  
pp. 762-765 ◽  
Author(s):  
A. P. Surzhikov ◽  
T. S. Frangulyan ◽  
S. A. Ghyngazov ◽  
I. P. Vasil’ev
Keyword(s):  
Electron Beam ◽  
Low Energy ◽  
High Current ◽  
Surface Layers ◽  
Pulsed Electron Beam ◽  
Zirconium Ceramics

scholarly journals Mechanism of surface nanocrystallization in pure nickel induced by high-current pulsed electron beam

2009 ◽  
Vol 58 (10) ◽  
pp. 7300
Author(s):  
Cheng Du-Qing ◽  
Guan Qing-Feng ◽  
Zhu Jian ◽  
Qiu Dong-Hua ◽  
Cheng Xiu-Wei ◽  
...  
Keyword(s):  
Electron Beam ◽  
Pure Nickel ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Surface Nanocrystallization
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