Analysis of the electron beam welding and different modes of heat treatment such as local heat tr... more Analysis of the electron beam welding and different modes of heat treatment such as local heat treatment, furnace annealing, slow speed cooling, water quenching and aging impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints. Microstructure of obtained welded joints in the states after welding and heat treatment were investigated. Using welded joints microsections approximate amount of β-phase has been obtained. Mechanical properties of the welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
Конструкционные псевдо-β-титановые сплавы нашли широкое применение в изделиях авиа-и ракетостроен... more Конструкционные псевдо-β-титановые сплавы нашли широкое применение в изделиях авиа-и ракетостроения. однако при получении сварных соединений псевдо-β-сплавов методом сварки плавлением возникают трудности, связанные с изменением структуры и образованием метастабильных фаз в сварном соединении. В данной работе, с помощью разработанной математической модели процесса аДс неплавящимся электродом, исследовано влияние термического цикла сварки на форму шва, скорости охлаждения и структуру металла сварного соединения из псевдо-β-титанового сплава Вт19. Установлено количество фаз в металле шва, зоне термического влияния и основном металле, спрогнозирован фазовый состав и его влияние на механические свойства сварных соединений. Библиогр. 8, табл. 4, рис. 11 К л ю ч е в ы е с л о в а : аргонодуговая сварка, ТИГ-сварка, высокопрочные титановые сплавы, математическое моделирование
IOP Conference Series: Materials Science and Engineering, 2019
Analysis of the electron beam welding and different modes of heat treatment such as local heat tr... more Analysis of the electron beam welding and different modes of heat treatment such as local heat treatment, furnace annealing, slow speed cooling, water quenching and aging impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints. Microstructure of obtained welded joints in the states after welding and heat treatment were investigated. Using welded joints microsections approximate amount of β-phase has been obtained. Mechanical properties of the welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
At present time, welding of high-strength titanium alloys can be performed using arc, electron be... more At present time, welding of high-strength titanium alloys can be performed using arc, electron beam in vacuum (EBW) and laser beam. There are successful examples of application of combined laser-arc process for performance of welded joints of titanium alloys. Negative effect of thermal cycle of EBW and laser welding on properties of series of alloyed titanium alloys is indicated in some cases. Aim of the present work lied in investigation of effect of different methods of welding and filler metal on mechanical properties and structure of welded joints by the example of titanium alloy T110. It is shown that high-strength titanium alloy T110 differs in good weldability in performance welded joints by EBW, full penetration argon-arc tungsten-electrode welding, argon-arc tungsten-electrode welding over the flux layer and laser-arc welding. SP-15 grade wire is reasonable for application as filler for argon-arc welding of T110 alloy. If welding without filler material is used, argon-arc tungsten-electrode welding over the flux layer provides the highest values of impact toughness of weld and HAZ metal. 8 Ref., 2 Tables, 3 Figures.
Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific stren... more Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific strength. The thermal cycle of welding results in change of structures of weld and HAZ metal and also in deterioration of mechanical characteristics of the joint. In the work the properties of welded joints of titanium alloys VT23, T110 and high-alloyed alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, produced using electron beam and argon arc welding, were evaluated. In weld and HAZ metal of the TIG-welded joints of alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, the structure is formed with a predominance of metastable β-phase and low values of strength and impact toughness, the joints require postweld high-temperature annealing at temperature of not less than 900 °C. The joints of VT23 alloy have high values of strength and impact toughness. High-strength titanium alloy T110 is characterized by good weldability in EBW and TIG welding, has high values of impact toughness of weld metal and HAZ after annealing, the strength of welded joints is at the level of 0.9 of base metal strength. 7 Ref., 2 Tables, 4 Figures. K e y w o r d s : titanium alloys, tungsten-electrode argon-arc welding, electron beam welding, properties
The paper deals with features of joint formation in complex high-strength (α + β)-titanium alloy ... more The paper deals with features of joint formation in complex high-strength (α + β)-titanium alloy in vacuum electron beam welding. Investigations were performed on samples of alloy of Ti-Al-Mo-V-Nb-cr-Zr system produced by electron beam remelting. Influence of thermal cycle of welding and subsequent heat treatment on structural-phase transformations in the metal of weld and welded joint HAZ has been studied. A structure with prevalence of metastable β-phase forms in the metal of weld and HAZ, which promotes lowering of ductility and impact toughness values. Postweld heat treatment is required to improve the structure and properties of EB-welded joints. The best combination of strength and ductility of studied welded joints was achieved after performance of furnace heat treatment (annealing at T = 900 °c for 1 h and cooling in the furnace), which promotes producing a practically uniform structure and metastable phase decomposition in the weld and HAZ. 8 Ref., 2 Tables, 8 Figures.
Analysis of the TIG-welding impact on the structure and mechanical properties of pseudo-β titaniu... more Analysis of the TIG-welding impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints, obtained with different welding speed, different filler wire amount in welded joint, with and without flux layer. Microstructure of obtained welded joints were investigated. Using welded joints microsections approximate amount of β-phase in different parts of welds have been obtained. Mechanical properties of the obtained welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
Analysis of the electron beam welding and different modes of heat treatment such as local heat tr... more Analysis of the electron beam welding and different modes of heat treatment such as local heat treatment, furnace annealing, slow speed cooling, water quenching and aging impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints. Microstructure of obtained welded joints in the states after welding and heat treatment were investigated. Using welded joints microsections approximate amount of β-phase has been obtained. Mechanical properties of the welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
Конструкционные псевдо-β-титановые сплавы нашли широкое применение в изделиях авиа-и ракетостроен... more Конструкционные псевдо-β-титановые сплавы нашли широкое применение в изделиях авиа-и ракетостроения. однако при получении сварных соединений псевдо-β-сплавов методом сварки плавлением возникают трудности, связанные с изменением структуры и образованием метастабильных фаз в сварном соединении. В данной работе, с помощью разработанной математической модели процесса аДс неплавящимся электродом, исследовано влияние термического цикла сварки на форму шва, скорости охлаждения и структуру металла сварного соединения из псевдо-β-титанового сплава Вт19. Установлено количество фаз в металле шва, зоне термического влияния и основном металле, спрогнозирован фазовый состав и его влияние на механические свойства сварных соединений. Библиогр. 8, табл. 4, рис. 11 К л ю ч е в ы е с л о в а : аргонодуговая сварка, ТИГ-сварка, высокопрочные титановые сплавы, математическое моделирование
IOP Conference Series: Materials Science and Engineering, 2019
Analysis of the electron beam welding and different modes of heat treatment such as local heat tr... more Analysis of the electron beam welding and different modes of heat treatment such as local heat treatment, furnace annealing, slow speed cooling, water quenching and aging impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints. Microstructure of obtained welded joints in the states after welding and heat treatment were investigated. Using welded joints microsections approximate amount of β-phase has been obtained. Mechanical properties of the welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
At present time, welding of high-strength titanium alloys can be performed using arc, electron be... more At present time, welding of high-strength titanium alloys can be performed using arc, electron beam in vacuum (EBW) and laser beam. There are successful examples of application of combined laser-arc process for performance of welded joints of titanium alloys. Negative effect of thermal cycle of EBW and laser welding on properties of series of alloyed titanium alloys is indicated in some cases. Aim of the present work lied in investigation of effect of different methods of welding and filler metal on mechanical properties and structure of welded joints by the example of titanium alloy T110. It is shown that high-strength titanium alloy T110 differs in good weldability in performance welded joints by EBW, full penetration argon-arc tungsten-electrode welding, argon-arc tungsten-electrode welding over the flux layer and laser-arc welding. SP-15 grade wire is reasonable for application as filler for argon-arc welding of T110 alloy. If welding without filler material is used, argon-arc tungsten-electrode welding over the flux layer provides the highest values of impact toughness of weld and HAZ metal. 8 Ref., 2 Tables, 3 Figures.
Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific stren... more Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific strength. The thermal cycle of welding results in change of structures of weld and HAZ metal and also in deterioration of mechanical characteristics of the joint. In the work the properties of welded joints of titanium alloys VT23, T110 and high-alloyed alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, produced using electron beam and argon arc welding, were evaluated. In weld and HAZ metal of the TIG-welded joints of alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, the structure is formed with a predominance of metastable β-phase and low values of strength and impact toughness, the joints require postweld high-temperature annealing at temperature of not less than 900 °C. The joints of VT23 alloy have high values of strength and impact toughness. High-strength titanium alloy T110 is characterized by good weldability in EBW and TIG welding, has high values of impact toughness of weld metal and HAZ after annealing, the strength of welded joints is at the level of 0.9 of base metal strength. 7 Ref., 2 Tables, 4 Figures. K e y w o r d s : titanium alloys, tungsten-electrode argon-arc welding, electron beam welding, properties
The paper deals with features of joint formation in complex high-strength (α + β)-titanium alloy ... more The paper deals with features of joint formation in complex high-strength (α + β)-titanium alloy in vacuum electron beam welding. Investigations were performed on samples of alloy of Ti-Al-Mo-V-Nb-cr-Zr system produced by electron beam remelting. Influence of thermal cycle of welding and subsequent heat treatment on structural-phase transformations in the metal of weld and welded joint HAZ has been studied. A structure with prevalence of metastable β-phase forms in the metal of weld and HAZ, which promotes lowering of ductility and impact toughness values. Postweld heat treatment is required to improve the structure and properties of EB-welded joints. The best combination of strength and ductility of studied welded joints was achieved after performance of furnace heat treatment (annealing at T = 900 °c for 1 h and cooling in the furnace), which promotes producing a practically uniform structure and metastable phase decomposition in the weld and HAZ. 8 Ref., 2 Tables, 8 Figures.
Analysis of the TIG-welding impact on the structure and mechanical properties of pseudo-β titaniu... more Analysis of the TIG-welding impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints, obtained with different welding speed, different filler wire amount in welded joint, with and without flux layer. Microstructure of obtained welded joints were investigated. Using welded joints microsections approximate amount of β-phase in different parts of welds have been obtained. Mechanical properties of the obtained welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.
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Papers by Roman Selin