Solid-phase weldability of sheets titanium alloy VT6 at low temperature

M.H. Mukhametrakhimov1
1Institute for Metals Superplasticity Problems RAS, 39 Khalturin St., Ufa, 450001, Russia
Abstract
The solid-phase weldability of titanium of industrial two-phase titanium alloy VT6 in the temperature range T=750…900°С is experimentally studied. Metallography researches showed that in the two-phase alloy VT6 at forming solid state joining under conditions of temperature T=900°С for τ=2 hours ,the microstructure of purveyances was combined into larger units, the middle size of grains α-phase had grown to d=6,0±1 μm. With decreasing a welding temperature to T=750°C, the middle size of grains has not changed on the whole, although his size in - insignificantly grew up a α- phase as compared to the initial. The quality of solid-phase joint (SSJ) was investigation by mechanical tensile and shear tests. The results of mechanical tests specimens showed, that after welding at the temperature of T=900°C the shear strength is 83%, and with a decreased in a welding temperature to T=750°C, specimens preserved strength properties, and shear strength of SSB is equal to 96% from the corresponding strength of the basic material. The presence of pores in the zone of SSB of titanic alloy of VT6 does not have influence on its strength properties, that is comparable with strength of the basic material. Fractography research of the SSB surface of the destroyed specimens after tests on a change showed that the united specimens at the elevated temperature of T=900°С destruction takes place in the zone of viscous destruction. With decreasing welding temperature to T=750°С, specimens destruction takes place in the zone of fragile-viscid destruction. The analysis of the results of the industrial titanium alloy VT6 mechanical tests has shown that mechanical behavior depends considerably on the welding temperature. As the pressure welding temperature is decreased from T=900°C to 750°C the shear strength level of both the base material and the SSB material is preserved.
Accepted: 26 May 2015
Views: 115   Downloads: 23
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