This article contains the comparison of physical and mechanical properties of several titanium alloys. The chemical composition influence on mechanical properties is investigated. VT22I and VT35 highly alloyed titanium alloys are the most prominent materials for armor elements production with ultimate tensile strength of 1200-1400 MPa and impact strength of 0,25-0,3 MJ/m2.
The ability of hydrogen to penetrate through the oxide film formed during air-atmosphere annealing at elevated temperatures on VT6 titanium alloy samples was studied in this paper. It was investigated that oxide film prevents the penetration of up to 0.4 wt.% hydrogen. It was shown that it is possible to change the depth of hydrogen penetration and the surface layer structure by varying the amount of added hydrogen. It was determined that the formation of a finely dispersed surface structure after the thermal hydrogen treatment allows to increase the surface hardness by 8-10 HRC, compared to the center of material.
The possibility of using a titanium nitride coating as a «protective» layer against the penetration of hydrogen into VT6 titanium alloy semi-finished or finished products was shown in this article. It was found that the titanium nitride coating does not dissolve during high-temperature vacuum annealing and «isolates» sample sides from hydrogen penetration, which allows to form a linear gradient structure during subsequent thermal hydrogen treatment.
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