Structural decomposition and phase changes in TiNi surface layer modified by low-energy high-current pulsed electron beam

2019 ◽  
Vol 803 ◽  
pp. 721-729 ◽  
Author(s):  
A.A. Neiman ◽  
V.O. Semin ◽  
L.L. Meisner ◽  
M.G. Ostapenko
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Phase Changes ◽  
Low Energy ◽  
High Current ◽  
Structural Decomposition ◽  
Pulsed Electron Beam ◽  
Tini Surface

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.

Microstructure, Texture and Residual Stresses Induced by Surface Thermo-Mechanical Treatments

2011 ◽  
Vol 675-677 ◽  
pp. 9-14
Author(s):  
Thierry Grosdidier ◽  
Bernard Bolle ◽  
J.D. Puerta Velásquez ◽  
J.X. Zou ◽  
Jean-Jacques Fundenberger ◽  
...  
Keyword(s):  
Electron Beam ◽  
Residual Stresses ◽  
High Speed ◽  
Processing Parameters ◽  
Low Energy ◽  
Difficult Case ◽  
High Speed Machining ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Ti Alloys

This paper reviews some recent results concerning surface integrity of materials processed with two important developing techniques: high speed machining (HSM) – here applied to the difficult case of Ti alloys – and low energy high current pulsed electron beam (LEHCPEB) surface treatment of steels. The effect of the processing parameters on the development of microstructure, texture and residual stresses is detailed for modifications occurring both at the surfaces and sub-surfaces.

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.

Low Energy High Current Pulsed Electron Beam (LEHCPEB) Treatment: An Effective Way for Improving Surface Microstructure and Properties

2010 ◽  
Vol 636-637 ◽  
pp. 1091-1096
Author(s):  
Thierry Grosdidier ◽  
Jian Xin Zou ◽  
K.M. Zhang ◽  
Sheng Zhi Hao ◽  
Chuang Dong
Keyword(s):  
Electron Beam ◽  
Surface Modifications ◽  
Metastable Phases ◽  
Low Energy ◽  
Surface Microstructure ◽  
High Current ◽  
Present Contribution ◽  
Corrosion Properties ◽  
Pulsed Electron Beam ◽  
Wear And Corrosion

Low energy high current pulsed electron beam (LEHCPEB) is a fairly new technique for surface modifications, including hardening, alloying and formation of metastable phases as well as improvement in wear and corrosion properties. The present contribution gives some new insights on the microstructure modifications encountered at the top surface of HCPEB treated metals. In particular, the potential of the technique for structure modifications associated with the use of the pulsed electron beam under “heating” and “melting” conditions are highlighted.

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