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Titanium alloy heat treatment - annealing (6)

(6) Double annealing
The difference between double annealing and isothermal annealing is that in the first stage after double annealing, the alloy is cooled to room temperature in air, and then the alloy is reheated to the temperature of the second stage (this temperature is lower than the temperature of the first stage).
The advantage of double annealing is that a part of the metastable phase can be retained after the first annealing, and can be fully decomposed after the second annealing, that is, the β phase is decomposed, causing a strengthening effect, which can improve the shaping of the α + β titanium alloy, Fracture toughness and tissue stability.

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