What is the difference between titanium alloy plate and other metals?

Like other metals, the recrystallization process of titanium plates is also in the process of nucleation and growth of crystalline grains on the structure after deformation. At this time, the lattice type does not change, but the dynamic properties change.

This process is affected by the degree of cold deformation, heating temperature and holding time, and can be recrystallized by three-dimensional cold deformation rate, heating temperature and recrystallization grain size. The effect of alloying elements on the initial recrystallization temperature of pure titanium has been described in the previous section.

In addition to niobium and cobalt, commonly used alloying elements and impurity elements can increase the recrystallization temperature of titanium. The recrystallization was determined mainly by the combination of metallographic observation and X-ray diffraction. When recrystallization occurs, fine equiaxed grains appear on the deformed fiber structure.

At the same time, the diffraction rings on the Laue diagram phase of the X-ray backreflection began to become disconnected spots. For heat-treatable β alloys, recrystallization structures can also be displayed by means of incomplete aging (500℃/4 ~ 8 hours, air cooling).

The non-recrystallized grains of titanium alloy plate after incomplete aging are dark after corrosion. After measurement, the initial recrystallization temperature of Titanium Grade 2 pure titanium is about 550℃, Grade 9 titanium alloy is about 600℃, Titanium Ti-6Al-4V (Grade 5) is about 700℃, and TB2 alloy is 750℃.