SURFACE MODIFICATION OF METALLIC MATERIALS BY HIGH CURRENT PULSED ELECTRON BEAM

High current pulsed electron beam (HCPEB) has been developing as a useful tool for surface modification of materials. This paper presents our research work on surface modification of metallic materials, such as mold steel, stainless steel and magnesium alloy, with a HCPEB equipment of working parameters as electron energy 27keV, pulse duration ~1µs and energy density ~5J/cm2. Investigations performed have shown that the most pronounced changes of phase-structure state and properties occurring in the near-surface layer. The formation mechanism of surface craters and their evolution regularity are discussed based on the elucidation of non-equilibrium temperature filed and different kinds of stress formed during pulsed electron beam treatment. After the HCPEB treatments, samples show significant improvements in measurements of wear and corrosion resistance.

Download Full-text

Surface Treatment of Materials with High Current Pulsed Electron Beam

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.3959 ◽

2005 ◽

Vol 475-479 ◽

pp. 3959-3962 ◽

Cited By ~ 1

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.

Download Full-text

Surface modification of Cu-W powder metallurgical alloy induced by high-current pulsed electron beam

Powder Technology ◽

10.1016/j.powtec.2017.11.037 ◽

2018 ◽

Vol 325 ◽

pp. 340-346 ◽

Cited By ~ 11

Author(s):

Conglin Zhang ◽

Qi Gao ◽

Peng Lv ◽

Jie Cai ◽

Ching-Tun Peng ◽

...

Keyword(s):

Surface Modification ◽

Electron Beam ◽

High Current ◽

Pulsed Electron Beam

Download Full-text

Surface modification of CrFeCoNiMo high entropy alloy induced by high-current pulsed electron beam

Applied Surface Science ◽

10.1016/j.apsusc.2019.144453 ◽

2020 ◽

Vol 504 ◽

pp. 144453 ◽

Cited By ~ 4

Author(s):

Peng Lyu ◽

Yanan Chen ◽

Zijian Liu ◽

Jie Cai ◽

Conglin Zhang ◽

...

Keyword(s):

Surface Modification ◽

Electron Beam ◽

High Entropy Alloy ◽

High Current ◽

High Entropy ◽

Pulsed Electron Beam

Download Full-text

The Influence of Neodymium Element on the Crater Structure Formed on Al-17.5Si Alloy Surface Processed by High-Current Pulsed Electron Beam

Coatings ◽

10.3390/coatings10100922 ◽

2020 ◽

Vol 10 (10) ◽

pp. 922

Author(s):

Kui Li ◽

Bo Gao ◽

Ning Xu ◽

Yue Sun ◽

Vladimir Viktorovich Denisov ◽

...

Keyword(s):

Electron Microscopy ◽

Electron Beam ◽

Primary Silicon ◽

Structural Defects ◽

Metallic Materials ◽

High Current ◽

Metallic Material ◽

Pulsed Electron Beam ◽

Electron Microscopy Analysis ◽

Microscopy Analysis

The effect of neodymium element on the elimination of crater structures on the surface of Al-17.5Si metallic materials processed by high-current pulsed electron beam was investigated in this study. Field emission scanning electron microscopy analysis indicated that the grain sizes of Al-17.5Si metallic materials were reduced and craters were removed from surfaces of the processed Al-17.5Si metallic material after addition of Nd. This can be attributed to the efficient transfer of heat accumulated in rich-silicon (primary silicon) areas without the eruption of a primary silicon phase if the size of primary silicon grains are small. The X-ray diffraction analysis indicates that all diffraction peaks are broadened because of the presence of structural defects, grain refinement and stress state. Electron probe micro-analyzer analysis demonstrated that Al and Nd were evenly distributed on the surface of the treated alloy, which could be attributed to the diffusion of the element. Transmission electron microscopy analysis showed that nano-Al and nano-Si cellular textures were generated during the treated process. The formation of these structures can be attributed to rapid heating and cooling effects by the treatment. Finally, electrochemical tests revealed that the corrosion current density of Al-17.5Si metallic materials (with Nd, 0.3 wt.%.) surface decreased by three orders of magnitude compared with that of the processed Al-17.5Si metallic material surfaces (without Nd). This can be attributed to the elimination of craters and grain refining.

Download Full-text

Surface modification of CoCrAlY coating by high-current pulsed electron beam treatment under the “evaporation” mode

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/j.nimb.2014.07.025 ◽

2014 ◽

Vol 337 ◽

pp. 90-96 ◽

Cited By ~ 16

Author(s):

Jie Cai ◽

Qingfeng Guan ◽

Peng Lv ◽

Xiuli Hou ◽

Zhiping Wang ◽

...

Keyword(s):

Surface Modification ◽

Electron Beam ◽

Electron Beam Treatment ◽

High Current ◽

Pulsed Electron Beam

Download Full-text

Surface modification of Ni (50.6at.%) Ti by high current pulsed electron beam treatment

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2006.08.278 ◽

2007 ◽

Vol 434-435 ◽

pp. 682-685 ◽

Cited By ~ 22

Author(s):

K.M. Zhang ◽

J.X. Zou ◽

T. Grosdidier ◽

N. Gey ◽

D.Z. Yang ◽

...

Keyword(s):

Surface Modification ◽

Electron Beam ◽

Electron Beam Treatment ◽

High Current ◽

Pulsed Electron Beam

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.317 ◽

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.

Download Full-text