Introduction of heat treatment commonly used in titanium alloys!

Commonly used heat treatment methods for metal materials such as titanium alloys and titanium alloy plates are annealing, solution treatment and aging treatment. Annealing is to eliminate internal stress, improve plasticity and organizational stability to obtain better overall performance. Usually the annealing temperature of α alloy and (α+β) alloy is chosen at (α+β)─→β phase transition point 120～200℃; solid solution and aging treatment is rapid cooling from high temperature area to obtain martensite α′ Phase and meta-stable β phase, and then incubate in the middle temperature zone to decompose these meta-stable phases to obtain finely dispersed second phase particles such as α phase or compound to achieve the purpose of strengthening the alloy. Normally, the quenching of (α+β) alloy is carried out at (-40+100°C) below (α+β)─→β phase transition point, and the quenching of metastable β alloy at 40～80℃ above (α+β)─→β phase transition point get on. Aging treatment temperature is generally 450 ~ 550 ℃.

To sum up, the heat treatment process of titanium alloy can be summarized as:

(1) Stress relief annealing: The purpose is to eliminate or reduce the residual stress generated during processing. Prevent chemical attack 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: The purpose is to improve its strength. The α titanium alloy and the stable β titanium alloy cannot be strengthened and heat treated, and only annealed in production. The α+β titanium alloy and the metastable β titanium alloy containing 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, the industry also adopts metal heat treatment processes such as double annealing, isothermal annealing, β heat treatment, and deformation heat treatment.
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