Study of microstructure difference properties of electron beam welds with beam oscillation of 50 mm 316L in CFETR

Xia, Xiaowei; Wu, Ji; Liu, Zhihong; Shen, Xiao-Fang; Ma, Jin; Liu, Zhenfei

doi:10.1016/j.fusengdes.2018.12.011

Cited by 34 publications

(8 citation statements)

References 10 publications

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“…No morphological variation across the depth of the weld was also observed (Figure 7) for a comparatively thinner weld. Enhanced mechanical properties in joints prepared with beam oscillation, especially with higher oscillation diameter, may be attributed to more uniform and finer microstructure, which has also been reported for welds of other alloys [7][8][9][10].…”

Section: Discussionsupporting

confidence: 58%

“…Fu et al [7] showed that electron beam oscillation led to a more homogeneous microstructure along with the depth of thick weld of titanium alloy, which improved the fatigue properties of the joint. Xia et al [8] reported that electron beam oscillation induced the early formation of equiaxed grain at shallow depth and improved the weld morphology and uniformity of microstructure for a thick stainless joint. Wang et al [9] reported that circular laser beam oscillation produced the best joint of aluminium alloy with improved ductility, which was attributed to the development of equiaxed grain in the weld.…”

Section: Introductionmentioning

confidence: 99%

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Role of beam oscillation on electron beam welded zircaloy-4 butt joints

Nayak

Roy

2021

Science and Technology of Welding and Joining

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Effect of beam oscillation on microstructure, mechanical properties and corrosion behaviour of electron beam butt weld of zircaloy-4 was investigated. Joints made with beam oscillation demonstrated higher ductility, toughness and notch tensile strength and higher corrosion resistance than the joints prepared without beam oscillation. Heat mixing and faster cooling associated with beam oscillation restrict unidirectional crystal growth favouring the development of a more uniform, fine basketweave widmanstätten structure in the fusion zone. Improvement in mechanical and corrosion properties using beam oscillation was attributed to the development of a more uniform microstructure, lesser segregation and lesser intermetallic precipitation in the fusion zone.

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Section: Discussionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Role of beam oscillation on electron beam welded zircaloy-4 butt joints

Nayak

Roy

2021

Science and Technology of Welding and Joining

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“…However, it also consists of different parameters, namely beam oscillation frequency, beam oscillation radius and various modes of beam oscillation, such as circular, triangular, rectangular etc. [16,35,36]. As stated above, experimental investigation of the influence of these different beam oscillation parameters on weld porosity is time taking.…”

Section: Study That Is Multi-layer Perceptron (Mlp) and Support Vecto...mentioning

confidence: 99%

Study of micro-porosity in electron beam butt welding

Das

Dinda

Das

et al. 2022

Int J Adv Manuf Technol

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As complete elimination of porosity from the weld is very difficult, the next option available is to minimize this weld porosity, which is crucial for the safe performance of the welded components. However, this investigation through experiments alone is very tedious and time consuming. Additionally, very limited models are available in the literature for accurate prediction of different porosity attributes. The present study, thus, addressees both the experimental as well as modelling aspect on the study of micro-porosity during Electron Beam Welding (EBW) of SS304 plates. Welding parameters are reported to have significant influence on the micro-porosity. Hence, the influences of these parameters on micro-porosity attributes, namely pores number, average diameter, and sphericity are extensively studied experimentally employing optical microscopy (OM), scanning electron microscopy (SEM), X-ray computed tomography (XCT), and Raman spectroscopy. This is followed by an elaborate modelling through seven popular and wellrecognized Machine Learning Algorithms (MLAs) namely, Multi-Layer Perceptron (MLP), Support Vector Regression (SVR), M5P model trees regression, Reduced Error Pruning Tree (REPTree), Random Forest (RF), Instance-based k-nearest neighbor algorithm (IBk) and Locally Weighted Learning (LWL). These different techniques enhance the chance of obtaining the better predictions of the said micro-porosity attributes by overcoming the effect of data-dependence and other limitations of individual MLAs. The different model-predicted micro-porosity data are also validated through experimental data. Statistical tests and Monte-Carlo reliability analysis are additionally utilized to evaluate the performances of the employed algorithms. IBk and MLP are overall found to perform well.

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“…The scanning deflection was to control the electron beam with a pred mined curve through a function generator, which makes the electron beam move straight line and a certain waveform (circle, triangle or square (Figure 4c)). This st vibration stirring can improve the metal melting and solidification process, prohibit ten envelopes, refine the grain, and reduce the root spiking of the welds [27,28]. At the same time, in order to obtain an excellent welding joint, welding parameters such as beam current, focusing current, and welding speed were optimized before the test.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Effect of Pre-Heating and Post-Heating on Electron Beam Welding of Reduced Activation Ferrite/Martensite Steel

Zhang

Liu

et al. 2021

JNE

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Reduced activation ferritic/martensitic (RAFM) steels are considered the main candidate material for the water-cooled ceramic breeder (WCCB) in a fusion reactor. High-energy density welding approaches, such as electron beam welding (EBW) and laser beam welding (LBW), are frequently utilized in the welding of RAFM steels. During the welding process, cracks and other defects are prone to appear. In this paper, EBW was selected for the welding of RAFM steels. Those with and without pre-heat and post-heat treatment by electron beams are studied by finite element simulation and trials. The results show that the experimental results are consistent with the simulation. In particular, in the case of similar deformation, the residual stress after electron beam heat treatment is far less than that without heat treatment. Without heat treatment, the residual stress near the weld is more than 400 MPa, while the residual stress after heat treatment is about 350 MPa. As the reduction of residual stress is essential to prevent the occurrence of cracks and other defects after welding, pre-heat and post-heat treatment by the electron beam is deemed as an effective way to greatly improve the welding quality in RAFM steel welding.

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Study of microstructure difference properties of electron beam welds with beam oscillation of 50 mm 316L in CFETR

Cited by 34 publications

References 10 publications

Role of beam oscillation on electron beam welded zircaloy-4 butt joints

Role of beam oscillation on electron beam welded zircaloy-4 butt joints

Study of micro-porosity in electron beam butt welding

Effect of Pre-Heating and Post-Heating on Electron Beam Welding of Reduced Activation Ferrite/Martensite Steel

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