Electron Beam Melting Of New High-strength Titanium Alloy T120

Akhonin, S.V.; Pikulin, A.N.; Berezos, V.A.; Severin, A.Yu.; Erokhin, A.G.

doi:10.15407/sem2017.01.03

Cited by 6 publications

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“…The above mentioned alloys were melted with EBCH melting approach as 100 mm diameter and about 200 mm long ingots, using titanium sponge and Al-V master alloy (for Ti-6-4) or pure Al, V, Mo, Nb, and Fe (T110), as well as pure Al and Fe-Mo master alloy (for Ti-1.5Al-6.8Mo-4.5Fe). The ingots were melted at laboratory scale electronic beam unit UE-208 [10] by single melting. Real chemical compositions of melted ingots (averaged for 3 different locations of ingots) were following: i) Ti-5.8(wt.%)Al-3.86V; ii) Ті-5,5Al-1,2V-1V-0,7Zr-3,8Nb-2Fe; and iii) Ti-1.6Al-6.3Mo-4.36Fe.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Electron Beam Cold Hearth Melted Titanium Alloys and the Possibility of Their Use as Anti-Ballistic Materials

et al. 2020

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Three commercial titanium alloys: two-phase α+β Ti-6Al-4V (low alloyed), and T110 (Ti-5.5Al-1.5V-1.5Mo-4Nb-0.5Fe, higher-alloyed), and β-metastable Ti-1.5Al-6.8Mo-4.5Fe were melted using EBCHM approach in the form of 100 mm in diameter ingots with the weight of about 20 kg each. After 3D hot pressing at single β-field temperatures ingots were rolled at temperatures below β-transus onto plates with thickness varying from 3 mm to 25 mm. Different heat treatments, including annealing at α+β or β-field temperatures, and special strengthening Surface Rapid Heat Treatment (SRHT) which after final aging provided special gradient microstructure with a hardened surface layer over ductile basic core, were employed. Mechanical properties were studied with tensile and 3-point flexure tests. It was established that the best combination of tensile strength and ductility in all alloys studied was obtained after SRHT, whereas at 3-point flexure better characteristics were obtained for the materials annealed at temperatures of (α+β)-field. At the same time, ballistic tests made at a certified laboratory with different kinds of ammunition showed essential superiority of plates having upper layers strengthened with SRHT. The effect of microstructure of the alloys, plate thickness and type of used ammunition on ballistic resistance is discussed.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Electron Beam Cold Hearth Melted Titanium Alloys and the Possibility of Their Use as Anti-Ballistic Materials

et al. 2020

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“…EBCH method is more preferable compared to the conventional vacuum-arc melting with a consumable electrode (VAR), because the latter even after double melt does not always provide a uniform distribution of alloying elements throughout the ingot, especially for complex alloyed alloys [7,8]. Also, VAR does not guarantee the complete removal of dangerous inclusions (so-called low density inclusions and high density inclusions), which drastically reduce the ductility of titanium alloys [7,9]. The use of EBCH approach allows guaranteed not only to melt refractory elements, but also to refine metal from all inclusions and impurities through the use of an intermediate Cold Hearth, which ensures good results in smelting both commercially pure titanium and complex alloyed alloys [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Also, VAR does not guarantee the complete removal of dangerous inclusions (so-called low density inclusions and high density inclusions), which drastically reduce the ductility of titanium alloys [7,9]. The use of EBCH approach allows guaranteed not only to melt refractory elements, but also to refine metal from all inclusions and impurities through the use of an intermediate Cold Hearth, which ensures good results in smelting both commercially pure titanium and complex alloyed alloys [8,9]. Also, the use of even single-melt EBCH process allows to reduce essentially the cost of the resulting ingots due to the possibility of using up to 100% scrap in the initial charge, as well as eliminating the laborious operation of pressing the consumable electrode [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The use of EBCH approach allows guaranteed not only to melt refractory elements, but also to refine metal from all inclusions and impurities through the use of an intermediate Cold Hearth, which ensures good results in smelting both commercially pure titanium and complex alloyed alloys [8,9]. Also, the use of even single-melt EBCH process allows to reduce essentially the cost of the resulting ingots due to the possibility of using up to 100% scrap in the initial charge, as well as eliminating the laborious operation of pressing the consumable electrode [9,10]. On the other hand, a number of low-cost alloys of mainly β-metastable type (TIMETAL-LCB [8]), as well as a wide range of alloys on the basis of Ti-Al-Fe-Cr system [11][12][13] have been developed up to date.…”

Section: Introductionmentioning

confidence: 99%

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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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“…В качестве исходных заготовок использовали полученные способом электронно-лучевой плавки (ЭЛП) слитки сплава Т120 диаметром 150 мм (рис. 1) [7]. Химический состав полученных слитков приведен в табл.…”

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Structure And Properties Of New High-strength Titanium Alloy T120, Produced By The Method Of Ebr After Deformational And Heat Treatment

Akhonin¹,

Belous²,

Severin³

et al. 2017

Sovrem. elektrometall.

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определены технологические режимы проведения термодеформационной обработки слитков электронно-лучевой плавки нового сплава Т120. Проведены работы по получению экспериментальной серии деформированных заготовок из слитков диаметром 150 мм нового высокопрочного сплава. После проведенной деформационной обработки исследована микроструктура сплава Т120. определено, что структура титанового сплава Т120, полученного способом ЭЛП, после прокатки состоит из равноосных полиэдрических первичных β‫ـ‬зерен, а внутризеренная структура представлена α‫ـ‬ и β‫ـ‬фазами, причем α‫ـ‬фаза имеет пластинчатую морфологию. Установлено, что при проведении деформационной обработки на поверхности листов образуется окисный, а под ним приповерхностный альфированный слой толщиной до 0,5 мм. исследовано влияние термической обработки деформированных полуфабрикатов на структуру и свойства металла и установлены режимы, которые обеспечивают оптимальное сочетание прочности и пластичности для сплава Т120. Для достижения максимальной пластичности заготовки сплава Т120 целесообразно подвергать отжигу при температуре 900 о С, в результате чего в металле формируется внутризеренная (α + β)-структура с толщиной α-пластин 1,0...1,5 мкм. При этом значение ударной вязкости составляет KCV = 12…14 Дж/см 2 при относительном удлинении δ s = 12 %. библиогр. 9, табл. 2, ил. 5. К л ю ч е в ы е с л о в а : электронно-лучевая плавка; титановый сплав; деформационная обработка; термическая обработка; структура; свойства

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Electron Beam Melting Of New High-strength Titanium Alloy T120

Cited by 6 publications

References 0 publications

Electron Beam Cold Hearth Melted Titanium Alloys and the Possibility of Their Use as Anti-Ballistic Materials

Electron Beam Cold Hearth Melted Titanium Alloys and the Possibility of Their Use as Anti-Ballistic Materials

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

Structure And Properties Of New High-strength Titanium Alloy T120, Produced By The Method Of Ebr After Deformational And Heat Treatment

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