Influence of oxygen on the structure and properties of the VT3-1 alloy
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The oxygen content must not exceed 0.15% in the VT3-1 alloy containing 5.2–6.5% Al in order to guarantee high thermal stability during prolonged operation (up to 2000 h) at working temperatures.
An increase of the oxygen content by 0.1% increases the strength by 7 kg/mm2.
The increase in the strength by 15 kg/mm2 at 20°C obtained by increasing the oxygen content to 0.3% is almost completely lost at 300–400°C.
Oxygen reduces the stability of the β-phase; the decomposition of the β-phase increases with increasing oxygen concentrations.
The increase in strength and reduction of the ductility with increasing oxygen concentrations are connected with the formation of sections of heterophase structure as the result of the decomposition of the metastable β-phase.
An increase of the oxygen content by 0.1% or the aluminum content by 1% increases the temperature of the polymorphous transformation by 20–30°C.
KeywordsOxygen Aluminum Thermal Stability Ductility Oxygen Concentration
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