Abstract
The possibility of controlling the process of structure formation in the titanium transition grade alloy VT22 (Ti—5.5Al—4.3V—4.2Mo—0.8Cr—0.8Fe) by thermal hydrogen treatment (reversible alloying with hydrogen) has been investigated. It is shown that a large volume fraction of the β-phase, inherent in (α+β) — titanium alloys of the transition class (at least 40% in the studied alloy), provides suppression of the martensitic transformation already with the introduction of 0.1% (wt.) of hydrogen, and with the introduction of 0.3% (wt.) of hydrogen, only the metastable β-phase is fixed in the structure. During subsequent vacuum annealing, by controlling the development of the β→α-transformation, it is possible to form different types of structures in the alloy: from bimodal to equilibrium dispersed. Dispersed (α+β) — structure with an α-particle size no more than 0.5 μm is formed only during low-temperature (625—700°C) vacuum annealing.
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