scholarly journals Surface Alloying and Improved Property of Nb on TC4 Induced by High Current Pulsed Electron Beam

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2906
Author(s):  
Xueze Du ◽  
Nana Tian ◽  
Conglin Zhang ◽  
Peng Lyu ◽  
Jie Cai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
Surface Hardness ◽  
High Current ◽  
X Ray Diffraction ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
Tc4 Alloy ◽  
Nb Alloying

In this paper, an Nb alloying layer on a TC4 alloy was fabricated by using high-current pulsed electron beam (HCPEB) irradiation to improve surface performance. X-ray diffraction (XRD), optical microscopy (OM), laser surface microscope (LSM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the phase composition and microstructure of the surface layer. The microhardness, wear tests and corrosion resistance were also examined. The results show that after HCPEB alloying, a Nb-alloyed layer was formed with about 3.6 μm in thickness on the surface of the sample, which was mainly composed of α’-Ti martensite, β-Ti equiaxial crystals, and NbTi4 particles. After HCPEB irradiation, the surface hardness, wear resistance and corrosion resistance of Nb alloying layer on TC4 alloy were improved compared to the initial samples.

scholarly journals Nanocrystalline Cr-Ni Alloying Layer Induced by High-Current Pulsed Electron Beam

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 74 ◽  
Author(s):  
Lingyan Zhang ◽  
Ching-Tun Peng ◽  
Jintong Guan ◽  
Peng Lv ◽  
Qingfeng Guan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Strengthening Mechanism ◽  
High Current ◽  
Nickel Substrate ◽  
X Ray Diffraction ◽  
Pulsed Electron Beam ◽  
Solid Solution Strengthening ◽  
Transmission Electron ◽  
Solution Strengthening

In this investigation, chromium (Cr) was adopted as an alloying element on a nickel substrate, and the alloying process was materialized via high-current pulsed electron beam (HCPEB) irradiation. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were also conducted for microstructure characterization. The results showed that after HCPEB irradiation a nanocrystalline Cr-Ni alloying layer was formed and numerous dislocations were generated, resulting in a great deal of diffusion paths for Cr elements. Moreover, properties including hardness, wear and electrochemical performance were significantly improved after HCPEB irradiation, which was mainly due to the formation of the nanocrystalline Cr–Ni alloying layer. In addition, each strengthening mechanism that contributed to the hardness of the HCPEB-irradiated sample was mathematically analyzed, and solid solution strengthening was found to be of great importance.

scholarly journals Surface Alloys of 0.45 C Carbon Steel Produced by High Current Pulsed Electron Beam

2019 ◽  
Vol 38 (2019) ◽  
pp. 444-451 ◽  
Author(s):  
Lingyan Zhang ◽  
Yunxue Jin ◽  
Xitong Wang ◽  
Jie Cai ◽  
Qingfeng Guan
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
Carbon Steel ◽  
Medium Carbon Steel ◽  
High Current ◽  
Medium Carbon ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
Before And After

AbstractThe chromium was deposited on the surface of 0.45 C medium carbon steel by high current pulsed electron beam (HCPEB) alloying treatment to obtain a high quality alloying layer. The microstructure of the alloying layer was studied by X-ray diffraction, optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy. The hardness of the surface was measured by Vickers durometer. The corrosion resistance of samples before and after HCPEB irradiation was also measured by an electrochemical workstation. The results showed that the alloying layer with a dept of about 4–9 μm on the surface was formed after HCPEB alloying treatment. TEM results revealed that the Cr element is dissolved on the surface and alloyed with C element in the substrate to form Cr23C6 enhanced particles. The microhardness and corrosion resistance of the medium carbon steel subjected to a HCPEB alloying processing were remarkably improved compared with the original one.

scholarly journals Amorphization and Nano-Crystallization of Ni-Nb Coating on GH3039 Alloys by High Current Pulsed Electron Beam

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 347
Author(s):  
Conglin Zhang ◽  
Xuesu Ji ◽  
Jiahong Wang ◽  
Lingfan Lu ◽  
Zirun Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Amorphous Layer ◽  
Pulse Number ◽  
Nano Particles ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
Pulsed Irradiation

In this paper, the Ni-Nb coatings were successfully prepared onto the GH3039 alloys by High current pulsed electron beam (HCPEB). The transmission electron microscopy (TEM) results confirmed that the Ni-Nb layer of 10-pulsed samples exhibited partial amorphization, which was consisted of γ-Ni particles, rod-like Ni3Nb particles and nano Ni3Nb with 30 nm in size. After 20-pulsed irradiation, the results show that only Ni3Nb clusters with around 3 nm in size were dispersed in fully amorphization layer. With increased pulse number to 30, the nano-particles embedded into the amorphous layer were grown up, the size of which was about 8 nm. The microstructure evolution during HCPEB irradiation was from the partial amorphous to fully amorphous and then to nano-crystallization. The 20-pulsed samples possessed the best hardness and corrosion resistance. The ultrafine clusters uniformly embedded into amorphous layer were main reason for improving properties.

Surface Modification of Pure Titanium by High Current Pulsed Electron Beam

2012 ◽  
Vol 560-561 ◽  
pp. 994-999
Author(s):  
Jie Cai ◽  
Ming Zhen Wan ◽  
Yang Zou ◽  
Peng Lv ◽  
Zhi Yong Han ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Surface Modification ◽  
Electron Beam ◽  
Pure Titanium ◽  
Optical Microscope ◽  
Material Surface ◽  
Material Strength ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Transmission Electron

Polycrystalline pure titanium was irradiated by high-current pulsed electron beam (HCPEB). The microstructure changes and material strength were investigated by using microhardness tester, optical microscope, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) technique. The experimental results indicate that many craters are inevitably formed on the irradiated surface. The eruption of the craters makes the material surface cleaned, which can improve the corrosion resistance of materials. Furthermore, martensitic structure, ultra-fine grains and high-density dislocations are formed on the irradiated surface, which increase the hardness of the treated samples. The microhardness of 20-pulsed sample reaches 286Hv, which is 71% higher than the initial sample. Martensitic transformation, grain refinement and dislocation strengthening induced by HCPEB treatment are the dominating mechanism for the improvements of material strength. It is suggested that HCPEB technique is becoming an effective approach to surface modification for pure titanium and titanium alloy.

Transmission electron microscopy studying of structural features of NiTi B2 phase formed under pulsed electron-beam impact

2015 ◽  
Author(s):  
Ludmila L. Meisner ◽  
Alexey A. Neiman ◽  
Alexander I. Lotkov ◽  
Nikolai N. Koval ◽  
Viktor O. Semin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Structural Features ◽  
Pulsed Electron Beam ◽  
Transmission Electron ◽  
B2 Phase

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.

Influence of Electron Beam Pulsed Times on the Properties of 40Cr

2010 ◽  
Vol 154-155 ◽  
pp. 1170-1177
Author(s):  
Yuan Fang Chen ◽  
Xiao Dong Peng ◽  
Jian Jun Hu ◽  
Hong Bin Xu ◽  
Chan Hao
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
High Current ◽  
Wear Properties ◽  
X Ray ◽  
Pulsed Electron Beam ◽  
Surface Microstructures ◽  
40Cr Steel

Surface modification of 40Cr steel by high current pulsed electron beam has been investigated . The pulsed times of HCPEB was changed from 1 to 25 to prepare different specimens. Surface microstructures and section microstructures after HCPEB irradiation were detected by using metallurgical microscope, SEM and X-ray diffractometer. It is shown that crater defects were found on the surface after the irradiation of HCPEB and the density of craters will decrease with increasing pulses times. When treated by 27Kev accelerating voltage, with increasing pulse times, the particles located in surface layer were obviously refined .The surface roughness, hardness, wear properties and corrosion resistance were analyzed after irradiation of HCPEB. The wear resistance and corrosion resistance were obviously enhanced after 10 pulses treatment.

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

Coatings ◽  
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.

High Current Pulsed Electron Beam Effect on Micro-Arc Oxidation Film of Ti Alloy

2015 ◽  
Vol 1094 ◽  
pp. 320-324
Author(s):  
Hui Zhao ◽  
Chun Yan Du ◽  
Jin Hua Yang ◽  
Xiao Hui Wang
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Surface Film ◽  
Anatase Phase ◽  
Porous Ceramic ◽  
Rutile Phase ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Micro Arc Oxidation ◽  
Wear And Corrosion Resistance

High Current Pulsed Electron Beam (HCPEB) was employed to treat Ti-6Al-4V alloy subjected to micro-arc oxidation. The surface morphology and phase composition of surface film were investigated, as well as the wear and corrosion resistance. The results show that the coarse porous ceramic coating becomes smooth and compact after electron beam treatment. High temperature stable rutile phase increases, and low temperature stable anatase phase reduces. The friction coefficient of composite coating reduces obviously and stabilizes at 0.2, and the wear resistance is improved. The increased corrosion potential and decreased corrosion rate exhibits an enhanced corrosion resistance.

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