Common Heat Treatment Methods For Medical Titanium Alloys?

Commonly used heat treatment methods are annealing, solid solution and aging treatment. Annealing is to eliminate internal stresses, improve plasticity and organizational stability to obtain a better overall performance.
Usually α alloy and (α + β) alloy annealing temperature selected in (α + β) - → β-phase transition point of 120 ~ 200 ℃; solution and aging treatment is from the high temperature region of the fast cooling, in order to get the martensite α ′ phase and the sub-stabilized β-phase, and then in the mid-temperature zone insulation to make these sub-stabilized phase decomposition, get α-phase or compounds such as fine dispersion of the two-phase plasma point, so as to make the alloy to strengthen the purpose.

Usually (α + β) alloy quenching in (α + β) - → β phase transition point below 40 ~ 100 ℃, sub-stabilized β alloy quenching in (α + β) - → β phase transition point above 40 ~ 80 ℃. The aging treatment temperature is generally 450～550℃. To summarize, the 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 generated during processing. Prevent chemical attack and reduce deformation in some corrosive environments.

(2) complete annealing: the purpose is to obtain good toughness, improve machinability, conducive to re-machining as well as improve the stability of size and organization.

Titanium alloys suitable for medical applications.