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Mechanical properties of the layered materials at room temperature.
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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 perpendic...
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Citations
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.
