The commonly used heat treatment methods of
titanium tubes include annealing, solution and aging treatment. The purpose of annealing is to eliminate internal stress, improve plasticity and structure stability, and 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 treatments are rapid cooling at high temperature to obtain martensite α 'phase and metastable β phase, and then holding at medium temperature to decompose these metastable phases to obtain fine dispersed second phase particles such as α phase or compound, which can strengthen the alloy.
Titanium tube
The heat treatment process of titanium tubes can be summarized as follows:
(1) Solution treatment and aging: the purpose is to improve its strength, α titanium tube and stable β titanium tube can not be strengthened heat treatment, only annealing in production. α+β titanium tubes and metastable β titanium tubes containing a small amount of α phase can be further strengthened by solution treatment and aging.
(2) Complete annealing: the purpose is to obtain good toughness, improve machining properties, facilitate reprocessing and increase size and structure stability.
(3) Stress relief annealing: the purpose is to eliminate or reduce the residual stress produced in the processing process. Prevents chemical erosion and reduces deformation in some corrosive environments.
In addition, in order to meet the special requirements of the workpiece, the industrial
titanium pipe also adopts double annealing, isothermal annealing, β heat treatment, deformation heat treatment and other metal heat treatment processes.
