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Heat treatment of titanium alloy

The commonly used heat treatment methods of titanium alloy are annealing, solid solution and aging treatment. Annealing is to eliminate the internal stress, improve the plasticity and structure stability, so as to obtain better comprehensive properties. Generally, the annealing temperature of α alloy and (α + β) alloy is 120-200 ℃ below the transition point of (α + β) -→ β phase; the solution and aging treatment is to obtain the martensite α′ phase and metastable β phase from rapid cooling in high temperature zone, and then to decompose these metastable phases in the middle temperature zone, to obtain fine dispersed second phase particles such as α phase or compound, so as to strengthen the alloy. Generally, the quenching of (α + β) alloy is carried out at 40-100 ℃ below (α + β) - β phase transition point, and the quenching of metastable β alloy is carried out at 40-80 ℃ above (α + β) - β phase transition point. Aging treatment temperature is generally 450-550 ℃.

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Heat treatment process of titanium alloy can be summarized as follows:


(1) Stress relief annealing: the purpose is to eliminate or reduce the residual stress produced in the processing. Prevent chemical erosion and reduce deformation in some corrosive environments.


(2) Complete annealing: the purpose is to obtain good toughness, improve processing performance, facilitate reprocessing and improve the stability of size and structure.


(3) Solution treatment and aging: in order to improve its strength, α - titanium alloy and stable β - titanium alloy can not be strengthened by heat treatment, only annealing is carried out in production. α + β titanium alloy and metastable β titanium alloy with a small amount of α phase can be further strengthened by solution treatment and aging.


In addition, in order to meet the special requirements of the workpiece, dual annealing, isothermal annealing, β heat treatment, deformation heat treatment and other metal heat treatment are also used in industry.


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