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Impact toughness of layered VT6 alloy semiproducts
Abstract and Figures
Layered semiproducts produced by pressure welding of sheet workpieces of a VT6 titanium alloy are studied. Possible methods
of achieving isotropic mechanical properties of the semiproducts are discussed. The pores that are present in solid-phase
joint zones are found not to influence the impact toughness of the samples in which layers lie perpendicular to a notch. The
fracture surface has a ductile character with certain fracture zones.
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Experimental studies of solid-state weldability of microcrystalline VT6 titanium alloy through nanostructured layer of VT22 alloy in temperature interval of low-temperature superplasticity (820°C) were carried out. To improve the mechanical properties, the welds were heat treated at a temperature of 900°C after pressure welding. Heat treatment leads to an activation of diffusion processes, reduction of micropores in the welding zone. The relative extent of the pores after welding was 0.3. After heat treatment, the relative length of the pores decreased down to 0.1. Welding of dissimilar titanium alloys significantly reduces the pressure welding temperature. Using nanostructured VT22 as interlayer allows localizing deformation in the weld joint zone due to a significant difference between the flow stresses of the base and interlayer materials. When using nanostructured VT22 as interlayer, the structure and mechanical properties of VT6 titanium alloy welds are improved after heat treatment. The mechanical tests showed that the impact toughness after heat treatment increased more than twice.
Severe plastic deformation at temperatures below 0.4...0.5Tm was used to obtain submicrocrystalline (SMC) structure in pure titanium and titanium alloys Ti-6.7Al-4.7Mo and Ti-11Mo-5.5Sn-4.2Zr. The structural studies showed that the density of titanium and its alloys in the SMC condition was less that in the coarse grained (CG) one. This change is connected with the presence of less-density intercrystalline regions. Low temperature superplasticity was studied in the temperature range 450...575°C. A considerable dependence of ductility on alloy composition was shown. The calculated value of apparent activation energy of the Ti-6.7Al-4.7Mo was equal to 315 kJ/mol at n=2.3, that being higher than during superplastic (SP) deformation of the alloy with usual microstructure.
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- A. A. Ganeeva