Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti-6Al-4V / I. V. Vlasov, V. E. Egorushkin, V. E. Panin [et al.]
Уровень набора: Mechanics of SolidsЯзык: английский.Страна: .Резюме или реферат: The titanium alloy Ti-6Al-4V with strongly nonequilibrium [alpha]-and [beta]-phases has been studied for the first time. For this, it was subjected to cross-helical rolling (CHR) at T=1000°C (above the polymorphic transformation temperature), and then quenched in water in order to partially preserve vanadium in the [alpha]-phase, and aluminum in the [beta]-phase. Under active uniaxial tension, the non-equilibrium VT6 alloy was deformed in the absence of strain hardening at room temperature. Alloys treated with CHR below the polymorphic transformation temperature showed traditional parabolic hardening. The non-equilibrium of the VT6 alloy caused a strong increase in its impact toughness at low temperatures down to T=-70°C. The fatigue life of a nonequilibrium alloy has doubled. If the initial alloy has ductile-brittle fracture at low negative temperatures, then the nonequilibrium alloy deforms viscously with all signs of structural turbulence. Structural turbulence in a nonequilibrium alloy manifests itself in the temperature range from 20 to -70°C, during deformation of 3D-printed samples, under conditions of shock separation of diffusion-sintered multilayer VT6 alloy packets..Примечания о наличии в документе библиографии/указателя: [References: 30 tit.].Аудитория: .Тематика: электронный ресурс | труды учёных ТПУ | Ti-6Al-4V alloy | nonequilibrium [alpha] and [beta] phases | low-temperature impact toughness | fatigue life | structural turbulence | титановые сплавы | неравновесные фазовые переходы | турбулентность | фрактография | ударное нагружение | трещиностойкость Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References: 30 tit.]
The titanium alloy Ti-6Al-4V with strongly nonequilibrium [alpha]-and [beta]-phases has been studied for the first time. For this, it was subjected to cross-helical rolling (CHR) at T=1000°C (above the polymorphic transformation temperature), and then quenched in water in order to partially preserve vanadium in the [alpha]-phase, and aluminum in the [beta]-phase. Under active uniaxial tension, the non-equilibrium VT6 alloy was deformed in the absence of strain hardening at room temperature. Alloys treated with CHR below the polymorphic transformation temperature showed traditional parabolic hardening. The non-equilibrium of the VT6 alloy caused a strong increase in its impact toughness at low temperatures down to T=-70°C. The fatigue life of a nonequilibrium alloy has doubled. If the initial alloy has ductile-brittle fracture at low negative temperatures, then the nonequilibrium alloy deforms viscously with all signs of structural turbulence. Structural turbulence in a nonequilibrium alloy manifests itself in the temperature range from 20 to -70°C, during deformation of 3D-printed samples, under conditions of shock separation of diffusion-sintered multilayer VT6 alloy packets.
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