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Titanium Plate Recrystallization Process
In the titanium alloy plate and titanium plate, the recrystallization process is often accompanied by some other organizational changes. For example, in the near-alloy and a + β alloy with small β-stable element content, the dissolution process and the β-component change in the a-heat-treated β alloy are accompanied by the simultaneous recrystallization process, Or the effect of the subsequent aging effect. In addition, different types of alloys at room temperature of different microstructure, involved in the deformation of the alloy phase is different from the process of recrystallization and characteristics are not the same.
Titanium alloy plate and titanium plate in addition to heating the cold tissue after the recovery and recrystallization process, there are compounds of the solution and a → β polymorphic transformation. In order to improve the properties of titanium and titanium plates, in addition to the necessary alloying, the general use of appropriate heat treatment. Titanium alloy and titanium plate recovery process is also at a certain temperature, through the vacancy and dislocation of the movement of the deformation caused by most of the second type of internal stress to eliminate the process. The temperature at which the recovery process takes place is lower than the recrystallization temperature, typically between 500 and 650 ° C. The
The effect of alloying elements on the recrystallization temperature of pure titanium has been described in the previous section. In addition to niobium and cobalt, the commonly used alloying elements and impurity elements can improve the recrystallization temperature of titanium. Determination of recrystallization mainly by metallographic observation and X-ray diffraction combined method. When recrystallization occurs, fine equiaxed grains appear on the deformed fibrous tissue, and the diffractive ring on the x-ray back reflections of the Laue diagram begins to become unconnected spots. For the heat-treatable β alloy, the recrystallized structure can also be shown by incomplete aging (500 ° C / 4 to 8 hours, air cooling), and the non-recrystallized grains after incomplete aging are dark after etching. The initial recrystallization temperature of TA2 titanium is about 550 ℃, TA7 titanium alloy is about 600 ℃, TC4 titanium alloy is about 700 ℃, TB2 alloy is 750 ℃.
Like other metals, the recrystallization process of the titanium alloy plate and the titanium plate is also a process of nucleation of the crystal grains in the deformed structure. At this time the lattice type does not change, but there are changes in mechanical properties. This process is affected by the degree of cold deformation, the heating temperature and the holding time, and can be recrystallized by the three-dimensional recrystallization of the cold deformation rate, the heating temperature and the recrystallized grain size.
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