scholarly journals The microstructure and properties of Mo alloying layer after surface alloying treatment induced by continuous scanning electron beam process

2021 ◽  
Vol 2133 (1) ◽  
pp. 012044
Author(s):  
Xulong Ren ◽  
Rong Wang ◽  
Jing Zhang ◽  
Deqiang Wei
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Molybdenum Carbide ◽  
Electron Beams ◽  
Sample Surface ◽  
Surface Alloying ◽  
Continuous Scanning ◽  
Alloy Zone ◽  
Carbide Particles ◽  
Scanning Electron

Abstract Surface alloying by scanning electron beams can improve the microstructure and mechanical properties of steel. In this study. Four electron energy densities were selected during the alloying process: E1 = 1.5J/cm2, E2 = 2.9J/cm2, E3 = 4.5J/cm2 and E4 = 5.9J/cm2. The obtained results show that the sample surface is composed of alloying zone and heat-affected zone. The microstructure of the alloy zone is concealed acicular martensite and molybdenum carbide particles. The microhardness of this area is 1250HV. The sample treated with an energy density of 5.9J/cm2 has the least amount of wear. After alloying treatment, the microhardness and wear amount of the scanned samples are significantly improved.

scholarly journals EFFECT OF HIGH-CURRENT ELECTRON BEAM IRRADIATION ON RESISTANCE OF SULFIDE-OXIDE CORROSION OF NI-CR-AL-Y ION-PLASMA COATINGS

2019 ◽  
Vol 16 (33) ◽  
pp. 198-205
Author(s):  
O. A. BYTSENKO ◽  
A. V. SHATILOV ◽  
A. I. DANEKO ◽  
E. V. FILONOVA ◽  
A. B. MARKOV
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Electron Beams ◽  
Sample Surface ◽  
High Current ◽  
Beam Irradiation ◽  
High Current Electron Beam ◽  
Ion Plasma ◽  
Current Electron ◽  
High Current Electron

Recently, the emergence of accelerators of high-current electron beams and powerful electron ion beams has contributed to the creation of unique effects of concentrated energy flows on materials. Upgrading of production processes and development of new technological processes of both domestic aircraft propulsion engineering and aviation arms remain topical and needed. Engine operational reliability depends on that of turbine blades. They are the most loaded details because they are experienced to action of static, dynamic and cyclic loadings as well as are subjected to cyclic thermal stresses. Therefore the main objective of our paper is to analyze the effect of high-current electron beam irradiation on-resistance of sulfide-oxide corrosion (SOC)of Ni-Cr-Al-Yion-plasma coatings. To achieve this purpose, beam irradiation was performed using the RITM-SP complex automated electron-beam setup. Modification of surface layer of SDP 2+VSDP16 ion-plasma coating by microsecond high-current electron beams of selected mode made it possible to increase considerably the SOC resistance. An analysis of the surface and microstructure of samples after SOC testing enabled to determine different effects of medium on sample coating depending on the state of the sample surface. When investigated samples microstructure, we found that after modification certain cracks on sample surface did not develop in the course of testing. It was found that some craters were not necessarily centers of corrosion damage origin, i.e., the existence of given types of craters and their impact on SOC resistance stability are ambiguous.

scholarly journals Numerical Simulation and Microstructure and Properties of 45 Steel by Scanning Electron Beam Bevel Polishing

2021 ◽  
Vol 2133 (1) ◽  
pp. 012032
Author(s):  
Tenghui Xia ◽  
Chunping Du ◽  
Zhiyong Liu ◽  
Jian Lu ◽  
Zhifa Zhu
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Lath Martensite ◽  
Mixed Phase ◽  
Scanning Electron Beam ◽  
Good Surface ◽  
The Matrix ◽  
Continuous Scanning ◽  
Inclination Angles ◽  
Scanning Electron

Abstract In order to obtain metal products with good surface quality, it is necessary to develop an efficient bevel polishing method. Therefore, this article Uses continuous scanning electron beam polishing. The surface of the material undergoes rapid melting and solidification and generates a dynamic temperature field. The polishing treatment improves the microstructure of the surface layer of the quenched and tempered 45 steel, and significantly increases the microhardness of the surface layer. The hardness after treatment can reach up to 747.6Hv, which is about 2.4 times higher than the matrix; the structure after hardening is transformed from the mixed phase of coarse acicular martensite and lath martensite to hidden acicular martensite and retained austenite a mixed phase thereof. In addition, after bevels with different inclination angles are subjected to electron beam surface polishing modification treatments with different scanning speeds, under the same parameters, as the inclination angle increases, the hardness value at the same position decreases.

Pulsed Electron Beam Melting of Fe

1981 ◽  
Vol 4 ◽  
Author(s):  
A. Knapp ◽  
D. M. Follstaedt
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Liquid Phase ◽  
Electron Beam Melting ◽  
Electron Beams ◽  
Sample Surface ◽  
Pulse Treatment ◽  
Pulsed Electron Beam ◽  
Density Of Dislocations ◽  
Slip Traces

ABSTRACTPulsed (50 nsec) electron beams with deposited energies of 1.1 ­ 2.4 J/cm2 have been used to rapidly melt a surface layer of Fe. Calculations show that this range of energies produces melt depths from 0.4–1.2 μm and melt times of 100–500 nsec. Optical microscopy and SEM of pulse treated polycrystalline foils show slip traces, as well as a general smoothing of surface features which shows that melting has occurred. TEM shows that the resolidified material is bcc, and that the material within a grain is epitaxial with the substrate. TEM also shows slip traces of {110} planes, as well as a high density of dislocations, both extended and loop. At the highest energy, subgrain boundaries are observed. Some samples were implanted with 1×1016 Sn/cm2 at 150 keV. After pulse treatment, the Sn depth profile was observed to have broadened, consistent with liquid phase diffusion. The Sn had the unexpected effect of suppressing slip at the sample surface.

Surface modification of 5CrMnMo steel with continuous scanning electron beam process

Vacuum ◽  
2018 ◽  
Vol 149 ◽  
pp. 118-123 ◽  
Author(s):  
Deqiang Wei ◽  
Xiaobing Wang ◽  
Rong Wang ◽  
Hongyang Cui
Keyword(s):  
Surface Modification ◽  
Electron Beam ◽  
Scanning Electron Beam ◽  
Continuous Scanning ◽  
Scanning Electron

Scanning electron beam lithography

1983 ◽  
Vol 41 ◽  
pp. 78-81
Author(s):  
Alec N. Broers
Keyword(s):  
Electron Beam ◽  
Integrated Circuit ◽  
Electron Beam Lithography ◽  
Large Scale ◽  
Electron Beams ◽  
Electrical Characterization ◽  
Optical Methods ◽  
Important Place ◽  
Scanning Electron Beam ◽  
Scanning Electron

This paper discusses the role of scanning electron beam lithography in semiconductor microcircuit production and in the experimental fabrication of devices in the laboratory. It also describes the electron optical equipment developed for these applications.Electron beam lithography has found an important place in integrated circuit production through its ability to produce structures without masks, rather than because it can produce high resolution. Resolution, however, has been important in research and development where electron beams have been used to produce smaller devices than any other method. Many early micron and sub-micron large scale integration devices were built first with electron beams, and structures as small as a few tens of nanometers have been made for electrical characterization.Optical methods are generally more economical than electron beams for the routine production of microcircuits because exposure rates are higher and system costs are lower. Resolution with optical lithography is adequate for all devices likely to be in production in the next few years (minimum linewidth 0.75μ - 2μ) so electron beams at present only offer an advantage in fabricating masks, or in exposing customized wafers where masks are not replicated a sufficiently large number of times to offset their cost.

Characterization and Manipulation of Boron Nanowire inside SEM

2008 ◽  
Vol 381-382 ◽  
pp. 31-34
Author(s):  
Ming Chang ◽  
C.H. Lin ◽  
Juti Rani Deka
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Electronic Devices ◽  
Vapor Liquid Solid ◽  
Buckling Instability ◽  
The Past ◽  
Afm Tips ◽  
Crystalline Boron ◽  
Boron Nanowires ◽  
Scanning Electron

Nanostructures materials have stimulated broad attention in the past decade because of their potential fundamental characteristics and its promising applications in nano electronic devices. In the present investigation, crystalline boron nanowires (BNWs) were synthesized by vapor liquid solid (VLS) technique and its mechanical properties were studied using a nanomanipulator inside a scanning electron microscope (SEM). Electron beam induced deposition (EBID) method was used to clamp boron nanowire to the AFM tips. The Young’s modulus of the NWs were determined from the buckling instability of NW and computed to be approximately 131.7 ± 14.6GPa. In addition, the nanomanipulation system was used to manipulate nanowire and built a nanoring.

Structure, Properties and Texturing of Ti-Ta-Mo Alloys Produced by Non-Vacuum Electron Beam Surface Alloying of Ti

2015 ◽  
Vol 788 ◽  
pp. 230-236 ◽  
Author(s):  
Alexey A. Ruktuev ◽  
Ivan A. Bataev ◽  
Mikhail G. Golkovskii ◽  
Anatoly A. Bataev ◽  
Ilya S. Laptev ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Backscatter Diffraction ◽  
Biomedical Application ◽  
Young Modulus ◽  
Sample Surface ◽  
Average Concentration ◽  
Surface Alloying ◽  
Electron Beam Processing ◽  
Beam Surface ◽  
Backscatter Diffraction

This paper is devoted to the investigation of structure and properties of Ti-Ta-Mo layers produced on the surface of commercially pure (cp) titanium using non-vacuum electron beam processing. Due to electron-beam surface alloying, a thick defect-free layer with increased hardness was produced. The average concentration of Ta and Mo was 22 % (wt.) and 9 % (wt.) respectively, which led to the formation of the β-Ti matrix with nanoscale precipitation of the ω-phase. The electron backscatter diffraction (EBSD) study revealed the formation of a cubic texture along the <100>direction ofβ-Ti normal to the sample surface, during crystallization of the surface layer. The results of this study can be used to predict the properties, particularly, the Young modulus of surface alloyed titanium, which may be of interest for biomedical application.

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