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Heat treatment process of titanium and titanium alloy

At present, the basic heat treatment processes of titanium and titanium alloys are mainly stress relief annealing, complete annealing, solution and aging treatment. Other processes, such as isothermal treatment, multistage annealing and multistage aging, are rarely used in production.





1. Solid solution and aging treatment process



The solution and aging treatment process is actually divided into two steps: solution treatment and aging treatment. Solution treatment is the operation of heating, holding and cooling titanium rod and alloy to room temperature. Aging treatment is the operation of air cooling after solution treatment and holding the workpiece for a certain time. The purpose of solution and aging treatment is that some a titanium alloy, β titanium alloy and a + β titanium alloy can not be strengthened by heat treatment, but can only be strengthened by annealing.



2. Stress relief annealing process



Stress relief annealing is also called incomplete annealing. Its function is to eliminate or reduce the internal stress produced in the cold working process and prevent the chemical erosion and deformation of the workpiece in special environment.



3. Complete annealing process



The purpose of complete annealing of titanium and titanium alloy is to obtain stable metal microstructure and improve physical properties, which is conducive to re machining and improve the stability of workpiece size and properties.


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