Microstructure Analysis of HPb59-1 Brass Induced by High Current Pulsed Electron Beam

2016 ◽  
Vol 35 (7) ◽  
pp. 715-721
Author(s):  
Jike Lyu ◽  
Bo Gao ◽  
Liang Hu ◽  
Shuaidan Lu ◽  
Ganfeng Tu
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Electron Beam ◽  
Surface Properties ◽  
Microstructure Evolution ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Β Phase ◽  
Nanocrystalline Structures ◽  
Two Phases

AbstractIn this paper, the effects of high current pulsed electron beam (HCPEB) on the microstructure evolution of casting HPb59-1 (Cu 57.1 mass%, Pb 1.7 mass% and Zn balance) alloy were investigated. The results showed a “wavy” surface which was formed with Pb element existing in the forms of stacking block and microparticles on the top surface layer after treatment. Nanocrystalline structures including Pb grains and two phases (α and β) were formed on the top remelted layer and their sizes were all less than 100 nm. The disordered β phase was generated in the surface layer after HCPEB treatment, which is beneficial for the improvement of surface properties. Meanwhile, there was a large residual stress on the alloy surface, along with the appearance of microcracks, and the preferred orientations of grains also changed.

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.

The effect of high-current pulsed electron beam on phase formation and surface properties of chromium/copper system

Vacuum ◽  
2020 ◽  
Vol 174 ◽  
pp. 109222 ◽  
Author(s):  
Conglin Zhang ◽  
Nana Tian ◽  
Lei Li ◽  
Zirun Yang ◽  
Peng Lv ◽  
...  
Keyword(s):  
Electron Beam ◽  
Surface Properties ◽  
Phase Formation ◽  
High Current ◽  
Pulsed Electron Beam

Surface Treatment of Materials with High Current Pulsed Electron Beam

2005 ◽  
Vol 475-479 ◽  
pp. 3959-3962 ◽  
Author(s):  
Sheng Zhi Hao ◽  
B. Gao ◽  
Ai Min Wu ◽  
Jian Xin Zou ◽  
Ying Qin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Electron Beam ◽  
Surface Treatment ◽  
Short Pulse ◽  
Research Work ◽  
High Current ◽  
Near Surface ◽  
Pulsed Electron Beam ◽  
Dynamic Stress Field

High current pulsed electron beam (HCPEB) is now becoming a promising energetic source for the surface treatment of materials. When the concentrated electron flux transferring its energy into a very thin surface layer within a short pulse time, superfast processes such as heating, melting, evaporation and consequent solidification, as well as dynamic stress field induced by an abrupt thermal distribution in the interactive zone impart surface layer with improved physicochemical and mechanical properties. The present paper reports mainly our experimental research work on this new-style technique. Investigations performed with a variety of constructional materials (aluminum, carbon and mold steel, magnesium alloys) have shown that the most pronounced changes of composition, microstructure and properties occur in the near-surface layers, while the thickness of the modified layer with improved mechanical properties (several hundreds of micrometers) is significantly greater than that of the heat-affected zone due to the propagation of stress wave. The surfaces treated with either simply several pulses of bombardment or complex techniques, such as rapid alloying by HCPEB can exhibit improved mechanical and physicochemical properties to some extent.

Defects and Microstructures in the Surface Layer of Single-crystal Silicon In-duced by High-current Pulsed Electron Beam

2011 ◽  
Vol 25 (12) ◽  
pp. 1313-1317 ◽  
Author(s):  
Xue-Tao WANG ◽  
Qing-Feng GUAN ◽  
Qian-Qian GU ◽  
Dong-Jin PENG ◽  
Yan LI ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Single Crystal ◽  
Single Crystal Silicon ◽  
High Current ◽  
Crystal Silicon ◽  
Pulsed Electron Beam

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 Characterization of High-current Pulsed Electron Beam Interaction with AISI 1045 Steel and the Microstructure Evolution

Procedia CIRP ◽  
2018 ◽  
Vol 68 ◽  
pp. 196-199 ◽  
Author(s):  
Yulei Fu ◽  
Jing Hu ◽  
Weijie Huo ◽  
Xiaotong Cao ◽  
Ruixue Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Microstructure Evolution ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Beam Interaction ◽  
1045 Steel
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