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Hot Deformation of Quench Hardened Titanium Alloys As A Modern Production Method of High Strength Structural Parts?

Titanium alloys belong to advanced metallic materials used in hi-tech industrial branches, like aeronautics. They are considered as a hard deformable materials - usually hot worked at the temperature of 0.65-0.75 Tmelt. Quite narrow temperature range of hot working makes it difficult to form near net shape parts which do not require additional heat treatment. Industrial manufacturing processes of two-phase α + β titanium alloys – mostly used for structural elements – include usually vacuum casting, initial plastic working of ingots at the temperature range of β phase stability, recrystallization annealing at the same temperature range and again plastic working, but at the temperature range of α + β phase transformation [1].


Hot formed parts made of two-phase titanium alloys are heat treated dependently on demanded microstructure (lamellar, globular, bi-modal). High strength of structural parts is achieved by quench hardening/solutioning and following tempering/ageing. Quench hardening operation is based on martensitic transformation β→α’(α”) which occurs during fast, continuous cooling (e.g. water quenching) from the temperature range of stable β phase. Final mechanical properties of heat treated parts result from effects of martensite decomposition (tempering) or metastable phase formation (ageing) [2].

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