The effect of phase transformations on the recovery of pulsed electron beam irradiated Ti-6Al-4V titanium alloy during scratching

Sinyakova, E. A.; Панин, А. В.; Перевалова, О. Б.; Шугуров, А. Р.; Калашников, М. П.; Тересов, А. Д.

doi:10.1016/j.jallcom.2019.04.320

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…Jisoo Kim and Hyung Wook Park reported that the pulse energy provided more significant impact on the depth of the re-solidified layer than the number of pulses [36]. Sinyakova et al [39] showed that the increase in electron beam energy density from 12 J cm −2 to 24 J cm −2 leads to the growth of irradiated layer thickness from 25 µm to 80 µm, respectively. Thus, the phase composition and structural parameters of the as-manufactured TNZT alloy could be changed at the upper surface layer.…”

Section: Morphology Microstructure and Phase Composition Of Tnzt Alloymentioning

confidence: 99%

“…It is known, that Ti alloys may reveal the presence of the equilibrium lattice structures (hcp α-and bcc β-phases), or metastable ones (hcp α′ martensite, orthorhombic α″ martensite, and the hexagonal ω-phase) in dependence of the alloy composition and thermomechanical process, which can occur during the sample preparation and/or treatment. Sinyakova, E. A., et al [39] reported that PEB treatment exhibited the formation of α′ and α″ phases in the melted surface layer of Ti-6Al-4V alloy. Meanwhile, Sankara et al [52] showed that the PEB irradiation has led to a transformation of the α + β dual phase to a single α′-martensite phase on the surface of the Ti-6Al-4V alloy.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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New Ti–35Nb–7Zr–5Ta Alloy Manufacturing by Electron Beam Melting for Medical Application Followed by High Current Pulsed Electron Beam Treatment

Surmeneva

Grubova

Glukhova

et al. 2021

Metals

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High-current pulsed electron-beam (PEB) treatment was applied as a surface finishing procedure for Ti–35Nb–7Zr–5Ta (TNZT) alloy produced by electron beam melting (EBM). According to the XRD results the TNZT alloy samples before and after the PEB treatment have shown mainly the single body-centered cubic (bcc) β-phase microstructures. The crystallite size, dislocation density, and microstrain remain unchanged after the PEB treatment. The investigation of the texture coefficient at the different grazing angle revealed the evolution of the crystallite orientations at the re-melted zone formed at the top of the bulk samples after the PEB treatment. The top-view SEM micrographs of the TNZT samples treated by PEB exhibited the bcc β-phase grains with an average size of ~85 μm. TEM analysis of as-manufactured TNZT alloy revealed the presence of the equiaxed β-grains with the fine dispersion of nanocrystalline α and NbTi4 phases together with β-Ti twins. Meanwhile, the β phase regions free of α phase precipitation are observed in the microstructure after the PEB irradiation. Nanoindentation tests revealed that the surface mechanical properties of the melted zone were slightly improved. However, the elastic modulus and microhardness in the heat-affected zone and the deeper regions of the sample were not changed after the treatment. Moreover, the TNZT alloy in the bulk region manufactured by EBM displayed no significant change in the corrosion resistance after the PEB treatment. Hence, it can be concluded that the PEB irradiation is a viable approach to improve the surface topography of EBM-manufactured TNZT alloy, while the most important mechanical parameters remain unchanged.

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Section: Morphology Microstructure and Phase Composition Of Tnzt Alloymentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

New Ti–35Nb–7Zr–5Ta Alloy Manufacturing by Electron Beam Melting for Medical Application Followed by High Current Pulsed Electron Beam Treatment

Surmeneva

Grubova

Glukhova

et al. 2021

Metals

View full text Add to dashboard Cite

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“…One of the mechanisms contributing to the formation and recovery of the scratch grooves is the reversible phase transformations developing during scratching. In particular, the enhanced elastic recovery of scratch grooves in Ti-6Al-4V samples subjected to electron beam treatment has been attributed to transformations of the more close-packed orthorhombic α″-Ti phase into the HCP α-Ti phase, and vice versa [33]. The analysis of the total energy per atom, performed using MD calculations for Ti crystallites with BCC and HCP lattices, showed that the possibility of β↔α phase transformations substantially depends on the V content.…”

Section: Discussionmentioning

confidence: 99%

“…It has been supposed that reversible phase transformations could be responsible for the substantial recovery of scratch grooves in ultrasonically treated commercially pure titanium and Ti-6Al-4V [32]. More recently, it has been found that the development of direct and reverse α"→α→α" martensitic transformations in the uppermost surface layer of Ti-6Al-4V samples subjected to low-energy, high-current pulsed electron beam treatment resulted in the enhancement of the elastic recovery of scratch grooves [33]. However, the effect of the microstructure of Ti-6Al-4V alloy on its ploughing behavior and elastic recovery has not been properly addressed.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Scratch Grooves in Ti-6Al-4V Alloy Caused by Reversible Phase Transformations

Шугуров

Панин

Дмитриев

et al. 2020

Metals

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The deformation behaviors of Ti-6Al-4V alloy samples with lamellar and bimodal microstructures under scratch testing were studied experimentally and using molecular dynamics simulation. It was found that the scratch depth in the sample with a bimodal microstructure was twice as shallow as that measured in the sample with a lamellar microstructure. This effect is attributed to the higher hardness of the sample with a bimodal microstructure and the larger amount of elastic recovery of scratch grooves in this sample. On the basis of the results of molecular dynamics simulation, a mechanism was proposed, which associates the recovery of the scratch grooves with the inhomogeneous vanadium distribution in the β-areas. The calculations showed that at a vanadium content typical for Ti-6Al-4V alloy, both the body-centered cubic (BCC) and hexagonal close-packed (HCP) structures can be more energetically favorable depending on the atomic volume. Therefore, compressive or tensile stresses induced by the indenter could facilitate β→α and α→β phase transformations, respectively, in the vanadium-depleted domains of the β-areas, which contribute to the recovery of the Ti-6Al-4V alloy subjected to scratching.

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“…Многочисленные исследования микроструктуры титанового сплава Ti−6Al−4V, полученного методами аддитивных технологий либо подвергнутого электроннопучковой обработке [14,[21][22][23], показали, что при высокой скорости охлаждения титанового сплава Ti−6Al−4V атомы ванадия не успевают диффундировать к границам зерен или границам пластин α ′ -мартенсита, оставаясь в твердом растворе на основе α-Ti, и тем самым уменьшая вероятность образования β-фазы. При этом наличие ванадия в твердом растворе должно приводить к уменьшению параметров решетки α-Ti, а также к увеличению полных среднеквадратичных смещений атомов.…”

Section: результаты и их обсуждениеunclassified

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

Перевалова¹,

Panin²,

Kazachenok³

2020

Журнал Технической Физики

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The microstructure, phase composition, and parameters of the -Ti based solid solution in the Ti-6Al-4V alloy obtained by 3D printing without cooling and with water cooling of the titanium substrate were studied by the methods of X-ray diffraction analysis, transmission diffraction and scanning electron microscopy, and optical metallography. It was found that the use of water cooling of the substrate leads to a decrease of the hereditary  grains sizes, an increase in the volume fraction of the  phase, a decrease in the volume fraction of the  phase and the total mean square displacement of atoms in the -Ti crystal lattice, as well as an increase in the elastic macrostrain of the samples.

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The effect of phase transformations on the recovery of pulsed electron beam irradiated Ti-6Al-4V titanium alloy during scratching

Cited by 14 publications

References 23 publications

New Ti–35Nb–7Zr–5Ta Alloy Manufacturing by Electron Beam Melting for Medical Application Followed by High Current Pulsed Electron Beam Treatment

New Ti–35Nb–7Zr–5Ta Alloy Manufacturing by Electron Beam Melting for Medical Application Followed by High Current Pulsed Electron Beam Treatment

Recovery of Scratch Grooves in Ti-6Al-4V Alloy Caused by Reversible Phase Transformations

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

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