Laboratory Electron Beam Unit Ue-208m

Akhonin, S.V.; Pikulin, A.N.; Berezos, V.A.; Kovalchuk, Dmytro; Тugаi, S. B.; str., Kyiv Psjc «Nvo «Chervona Khvilyia». Kazimir Malevich

doi:10.15407/sem2019.03.03

Cited by 18 publications

(2 citation statements)

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“…The T110 alloy with actual composition Ti-3.9(wt.%) Al-0.8V-1.5Mo-2.1Fe-0.7Zr-3.8Nb was melted in Scientific & Production Centre "Titan" (Kyiv, Ukraine [11,12]) using double-melting Electron Beam Cold Hearth method; cylindrical ingot with diameter 110 mm and length 200 mm was produced. The ingot was stripped and then subjected to multi-step thermomechanical processing followed by heat treatments (Fig.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Effect of Strain Rate on Mechanical Behavior and Microstructure Evolution of Ti-Based T110 Alloy

Markovsky

Janiszewski

Bondarchuk

et al. 2021

Metallogr. Microstruct. Anal.

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Recently developed thermally hardenable medium-level alloyed titanium alloy T110 was studied from the viewpoint of microstructure influence on the mechanical behavior under quasi-static and high-strain rate deformation. The globular microstructures of two types differing in aspect ratio of α-globules were formed under thermomechanical processing conditions with different reductions (ε total = 2, and 3) and final annealing at 850 °C, 3 h. The thermally hardened state was formed by conventional solid-solution treatment at a temperature of two-phase α+β field (880 °C, 45 min), water quenching, and final aging (550 °C, 5 h). Stress-strain dependencies were estimated on tension with strain rates varied from 8•10 −4 to 4•10 −2 s −1 , as well as compression with a strain rate of 10 −3 s −1 (quasi-static) and under high-strain rates varied from 870 s −1 to 3520 s −1 ; the deformation with high-strain rates has been achieved using split Hopkinson pressure bar (SHPB) technique. The tested material was also assessed using strain energy (SE) parameter. A parallel study of the microstructure and crystallographic texture formed during testing allowed to propose a reliable deformation and fracture mechanisms, depending on the stress state (tension, compression) and strain rate. A special role of the initial microstructure is noted, which determines the plasticity of the tested alloy, the sites of pore nucleation, features of crack growth, as well as the localization of deformation, which is determined by the mode and rate of loading. It is established and explained why the best balance of strength and ductility, and thus, the highest SE values in the all tests carried out were ensured by the alloy in the state with a more uniform microstructure of globular morphology (after the rolling with reduction ε total =3), which, in turn, provided general superiority over the widely used Ti-6Al-4V alloy.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Effect of Strain Rate on Mechanical Behavior and Microstructure Evolution of Ti-Based T110 Alloy

Markovsky

Janiszewski

Bondarchuk

et al. 2021

Metallogr. Microstruct. Anal.

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“…gas-discharge electron guns (Fig. 1) [20,21]. Commercial pure titanium (Grade 2), A0 grade aluminum, 99% purity molybdenum, technical purity chromium, and ARMCO iron were used as initial components.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Microstructure and Tensile Properties of Cost-Efficient Thermally Hardenable α + β Alloys of Ti–Al–Mo–Fe and Ti–Al–Mo–Cr Systems

Markovsky

Akhonin

Berezos

et al. 2020

Metallogr. Microstruct. Anal.

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Four new compositions of titanium alloys of Ti-Al-Mo-Fe and Ti-Al-Mo-Cr systems with content of β-phase stabilizing elements in a range of 3.8-9.8 wt.% (in terms of "molybdenum equivalent" C Mo ) were studied. The alloys were melted by single-melt electron-beam cold hearth technique, thermomechanically processed, and subjected to conventional (in furnace) or continuous rapid (resistant heating by electric current) heat treatments with different regimes. The microstructure, phase composition, and mechanical properties both in as-deformed state and after heat treatments were studied in detail. It is found that the proposed thermomechanical processing allows to obtain a transformed microstructure characterized by nearly equiaxed α-phase particles with relatively small aspect ratio and weak crystallographic texture of a basal type. Subsequent annealing in the α + β field led to completion of the α + β microstructure transformation; a microstructure of globular type was obtained in the low-alloyed (C Mo = 3.8%) material. The phase transformations at various stages of strengthening heat treatments and their influence on the final microstructure and properties were studied, depending on the content of β-stabilizing elements and processing route. Particular attention was paid to the influence of the content of β-stabilizing element on the mechanical properties, as well as to the difference between the alloying systems with iron or chromium. It is shown that the alloys of proposed compositions provide high strength and reliability; they are competitive with conventional commercial alloys in terms of the balance of mechanical properties in hot deformed, annealed, and thermally strengthened states. Strengthening treatment based on rapid heating allows to achieve strength above 1500 MPa with sufficient ductility.

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Mechanical Behaviour of Ti–15Mo Alloy Produced with Electron-Beam Cold Hearth Melting Depending on Deformation Rate and in Comparison with Other Titanium Alloys

2022

Prog. Phys. Met.

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Ti-15(wt.%)Mo alloy is produced with conventional cast and wrought approach using double electronbeam cold hearth melting, 3D hot pressing, and subsequent rolling. Three batches of specimens are subjected to microstructure study and quasi static tensile testing in the following states: (1) asrolled, (2) partially recrystallized via annealing at 800 °C for 40 minutes, (3) annealed at 800 °C for 3 hours followed by water quenching to fix the βphase. The specimens in the second state (2) are chosen for more detailed study of mechanical behaviour upon both quasistatic and high strainrate compressions. The obtained data on the mechanical behaviour are analysed from the standpoint of the effect of initial microstructure and crystal lographic texture in three mutually perpendicular planes on the strain energy and the critical strain rate that results into fracture. A detailed microstructural study C i t a t i o n:

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Laboratory Electron Beam Unit Ue-208m

Cited by 18 publications

References 0 publications

Effect of Strain Rate on Mechanical Behavior and Microstructure Evolution of Ti-Based T110 Alloy

Effect of Strain Rate on Mechanical Behavior and Microstructure Evolution of Ti-Based T110 Alloy

Microstructure and Tensile Properties of Cost-Efficient Thermally Hardenable α + β Alloys of Ti–Al–Mo–Fe and Ti–Al–Mo–Cr Systems

Mechanical Behaviour of Ti–15Mo Alloy Produced with Electron-Beam Cold Hearth Melting Depending on Deformation Rate and in Comparison with Other Titanium Alloys

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