Beam Current Effect on Microstructure and Properties of Electron-Beam-Melted Ti-6Al-4V Alloy

Pushilina, Natalia; Klimenov, V. A.; Cherepanov, Roman O.; Kashkarov, Egor; Fedorov, V. V.; Сыртанов, М. С.; Лидер, А. М.; Laptev, Roman

doi:10.1007/s11665-019-04344-0

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…25) Pushilina et al reported that the temperatures of the melt pool and its vicinity decrease with decreasing ED. 29) Thus, the increase in W £ is attributed to an increase in the region exposed to the relatively low temperatures, which cause formation of the £ band. In general, an increase in scan speed leads to a decrease in ED, as can be calculated from eq.…”

Section: Influence Of Scan Speed On Microstructurementioning

confidence: 99%

Effect of Scan Speed on Microstructure and Tensile Properties of Ti–48Al–2Cr–2Nb Alloys Fabricated via Additive Manufacturing

et al. 2023

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The morphology of microstructure and tensile properties of Ti48Al2Cr2Nb (at%) alloy rods fabricated by the electron beam powder bed fusion (EB-PBF) process were investigated with a particular focus on the influence of scan speed of the electron beam. Homogeneous near lamellar structure composed of the ¡ 2 and £ phases can be obtained in the rod fabricated under the slowest scan speed. The fine lamellar spacing which contributes to the high strength of the alloy is derived from the fast-cooling rate of EB-PBF. On the contrary, a layered microstructure comprising a duplex-like region and an equiaxed £ grain layer (£ band) perpendicular to the building direction is obtained when increasing scan speeds. We observed for the first time that an increase in the scan speed results in a narrow width of the £ band. We also found that these microstructural changes have a significant influence on the mechanical properties of the rods. The near lamellar structure exhibits higher strength compared to the layered microstructure. Whereas, the rods with the layered microstructure show large ductility at room temperature. The elongation of each rod strongly depends on the width of the £ band owing to the preferential deformation of the £ band.

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Section: Influence Of Scan Speed On Microstructurementioning

confidence: 99%

Effect of Scan Speed on Microstructure and Tensile Properties of Ti–48Al–2Cr–2Nb Alloys Fabricated via Additive Manufacturing

et al. 2023

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“…This shows that the Ti-6Al-4V alloy welding wire with reduced aluminum content (Ti-4Al-3V) is of limited use for obtaining products for industrial purposes. It can also be noted that the formation of a coarse-grained structure with low mechanical properties occurs when products are obtained by wire additive electron beam technology in general [13,31,32] (see Table 8), which, in this case, can be increased by conducting additional post-processing work. The reason for such a situation lies both in the grain size of the initial β-phase and in the structural phase state formed during cooling, along with their arrangement in the sample in the form of columnar elongated grains from the substrate to the top of the plate.…”

Section: MMmentioning

confidence: 99%

Influence of the Coarse Grain Structure of a Titanium Alloy Ti-4Al-3V Formed by Wire-Feed Electron Beam Additive Manufacturing on Strain Inhomogeneities and Fracture

et al. 2023

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In this work, based on the multilevel approach, the features of the structure and properties of titanium alloy, formed during high-performance additive manufacturing by wire-feed electron beam technology, were studied. Methods of non-destructive X-ray control and tomography, along with optical and scanning electron microscopy, were used to study the structure at different scale levels of the sample material. The mechanical properties of the material under stress were revealed via the simultaneous observation of the peculiarities of deformation development, using a Vic 3D laser scanning unit. Using microstructural and macrostructural data, as well as fractography, the interrelations of structure and material properties caused by the technological features of the printing process and the composition of used welding wire were revealed.

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“…In this work, samples were obtained using the EBM method from a powder of the Ti-6Al-4V composition manufactured by NORMIN Company (Normin, Borovichi, Russia) [37]. The average powder size ranged from 50 to 90 µm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The average powder size ranged from 50 to 90 µm. Samples were produced using an electron beam melting 3D printer designed at the National Research Tomsk Polytechnic University (Tomsk, Russia) [37]. The experimental parameters were as follows: an accelerating voltage of 40 kV, and a melting current of 15 mA.…”

Section: Sample Preparationmentioning

confidence: 99%

Surface Modification of the EBM Ti-6Al-4V Alloy by Pulsed Ion Beam

Pushilina

Stepanova

Stepanov

et al. 2021

Metals

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The effect of surface modification of Ti-6Al-4V samples manufactured by electron beam melting (EBM) using a pulsed carbon ion beam is studied in the present work. Based on the results of XRD, SEM, and TEM analysis, patterns of changes in the microstructure and phase composition of the EBM Ti-6Al-4V alloy, depending on the number of pulses of pulsed ion beam exposure, are revealed. It was found that gradient microstructure is formed as a result of pulsed ion beam irradiation of the EBM Ti-6Al-4V samples. The microstructure of the surface layer up to 300 nm thick is represented by the (α + α”) phase. At depths of 0.3 μm, the microstructure is mixed and contains alpha-phase plates and needle-shaped martensite. The mechanical properties were investigated using methods of uniaxial tensile tests, micro- and nanohardness measurements, and tribological tests. It was shown that surface modification by a pulsed ion beam at an energy density of 1.92 J/cm2 and five pulses leads to an increase in the micro- and nanohardness of the surface layers, a decrease in the wear rate, and a slight rise in the plasticity of EBM Ti-6Al-4V alloy.

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Beam Current Effect on Microstructure and Properties of Electron-Beam-Melted Ti-6Al-4V Alloy

Cited by 9 publications

References 25 publications

Effect of Scan Speed on Microstructure and Tensile Properties of Ti–48Al–2Cr–2Nb Alloys Fabricated via Additive Manufacturing

Effect of Scan Speed on Microstructure and Tensile Properties of Ti–48Al–2Cr–2Nb Alloys Fabricated via Additive Manufacturing

Influence of the Coarse Grain Structure of a Titanium Alloy Ti-4Al-3V Formed by Wire-Feed Electron Beam Additive Manufacturing on Strain Inhomogeneities and Fracture

Surface Modification of the EBM Ti-6Al-4V Alloy by Pulsed Ion Beam

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