Study on Microstructure Evolution Behaviors of WC-Co Hard Alloy Surface Under High Current Pulsed Electron Beam

2021 ◽  
Author(s):  
Ming Wang ◽  
L. Du ◽  
Y. Xu ◽  
X. Zhang ◽  
P.T. Qi ◽  
...  
Keyword(s):  
Electron Beam ◽  
Hard Alloy ◽  
Microstructure Evolution ◽  
Alloy Surface ◽  
High Current ◽  
Pulsed Electron Beam

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.

scholarly journals Halo Evolution of Hypereutectic Al-17.5Si Alloy Treated with High-Current Pulsed Electron Beam

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
L. Hu ◽  
B. Gao ◽  
J. K. Lv ◽  
S. C. Sun ◽  
Y. Hao ◽  
...  
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Electron Beam ◽  
Alloy Surface ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Relative Wear Resistance ◽  
Multiple Pulses ◽  
Diffraction Peaks ◽  
Bull's Eye

Halo evolution of an Al-17.5Si alloy surface after treatment with increasing pulse numbers of a high-current pulsed electron beam (HCPEB) was investigated. A halo is a ring microstructure resembling a bull’s eye. SEM results indicate that the nanocrystallization of halo induced by HCPEB treatment leads to gradual diffusion of the Si phase. Multiple pulses numbers cause the Si phase to be significantly refined and uniformly distributed. In addition, nanosilicon particles with a grain size of 30~100 nm were formed after HCPEB treatment, as shown by TEM observation. XRD results indicate that Si diffraction peaks broadened after HCPEB treatment. The microhardness tests demonstrate that the microhardness at the midpoint from the halo edge to center decreased sharply from 9770.7 MPa at 5 pulses to 2664.14 MPa at 25 pulses. The relative wear resistance of a 15-pulse sample is effectively improved by a factor of 6.5, exhibiting optimal wear resistance.

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

scholarly journals Study on microstructure and wear resistance of Zr-17Nb alloy irradiated by high current pulsed electron beam

2020 ◽  
Vol 59 (1) ◽  
pp. 514-522
Author(s):  
Yue Sun ◽  
Kui Li ◽  
Bo Gao ◽  
Pengyue Sun ◽  
Haiyang Fu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Electron Beam ◽  
Xrd Analysis ◽  
Pulse Number ◽  
Alloy Surface ◽  
Metallographic Analysis ◽  
Test Results ◽  
High Current ◽  
X Ray Diffraction ◽  
Pulsed Electron Beam

AbstractIn this paper, the microstructure and wear resistance of Zr-17Nb alloy treated by high current pulsed electron beam were studied in detail. A phase change occurs after pulse treatments using X-Ray Diffraction (XRD) analysis, showing β (Nb) phase and α (Zr) phase transformed by a part of β (Zr, Nb) phase. Also, narrowing and shifting of β (Zr, Nb) diffraction peaks were found. Scanning Electron Microscope (SEM) and metallographic analysis results reveal that the microstructure of alloy surface before high current pulsed electron beam (HCPEB) treatment is composed of equiaxed crystals. But, after 15 and 30 pulse treatments, crater structures are significantly reduced. Besides, it was also found that the alloy surface has undergone eutectoid transformation after 30 pulse treatments, and the reaction of β (Zr, Nb) → αZr + βNb had occurred. Microhardness test results show that microhardness value presents a downward trend as the number of pulses increases, which is mainly due to the coarsening of the grains and the formation of a softer β (Nb) phase after phase transformation. The wear resistance test results show that the friction coefficient increases first, then decreases and then increases with the increase of pulse number.

The effect of neodymium on the microcracks generated on the Al–17.5Si alloy surface treated by high current pulsed electron beam

2016 ◽  
Vol 364 ◽  
pp. 490-497 ◽  
Author(s):  
Liang Hu ◽  
Bo Gao ◽  
Guanglin Zhu ◽  
Yi Hao ◽  
Shuchen Sun ◽  
...  
Keyword(s):  
Electron Beam ◽  
Alloy Surface ◽  
High Current ◽  
Pulsed Electron Beam

scholarly journals Effect of Cerium and Magnesium on Surface Microcracks of Al–20Si Alloys Induced by High-Current Pulsed Electron Beam

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 61
Author(s):  
Liang Hu ◽  
Bo Gao ◽  
Ning Xu ◽  
Yue Sun ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Alloy Surface ◽  
Homogeneous Distribution ◽  
Anticorrosion Property ◽  
High Current ◽  
Pulsed Electron Beam ◽  
Mg2si Phase ◽  
Primary Si ◽  
Microcrack Propagation ◽  
Brittle Phase

The effect of Ce and Mg on surface microcracks of Al–20Si alloys induced via high-current pulsed electron beam (HCPEB) was studied. Mg was revealed to refine the primary Si phase in the pristine microstructure by forming a Mg2Si phase, leading to the suppression of microcrack propagation within the brittle phase after HCPEB irradiation. The incorporation of Ce into the Al–Si–Mg alloys further refined the primary Si phase and reduced the local stress concentration in the brittle phase induced by HCPEB irradiation. Ultimately, the surface microcracks were observed to be eliminated by the synergistic effects between the two elements. For Al–20Si–5Mg–0.7Ce alloys, Ce demonstrated a homogeneous distribution in the Al matrix on the HCPEB-irradiated alloy surface, while the Mg and Si exhibited a certain degree of aggregation in the Mg2Si phase. Metastable structures were formed on the HCPEB-irradiated alloy surface, including the nano-primary silicon phase, nano-cellular aluminium structure, and nano-Mg2Si phase. Compared with alloy specimens containing Mg, the Al–20Si–5Mg–0.7Ce alloy specimens exhibited an excellent anticorrosion property after HCPEB irradiation mainly due to the combined effects of the grain refinement and microcrack elimination.

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