Titanium alloys have the advantages of low density and high specific strength, and are widely used in the aerospace industry. TC4 titanium alloy has excellent comprehensive performance and is a two-phase titanium alloy with large usage. The types of titanium alloy products can be divided into plates, rods and wires, pipes, and special-shaped forgings, among which the production of rods accounts for about one-fifth of all types of titanium processing materials.

TC4 titanium alloy rod can be used as key components such as engine casings, missiles, pressure vessels, etc. after subsequent processing, so there are strict requirements for the material's microstructure and properties. In the production process of titanium alloy rods, occasional low magnification structural abnormalities such as bright stripes and bright spots may occur. The formation of these defects mostly belongs to the category of compositional segregation defects, which are commonly found in β - type titanium alloys with a wide variety of elements. According to the difference in hardness between the segregation site and the matrix structure, segregation can be divided into hard segregation and soft segregation, which are difficult to detect through non-destructive testing; However, the existence of this defect may affect the use of the material, and different standards require different treatment methods for such defects.

In recent years, the scope of titanium materials used in the chemical industry has been continuously expanding, and their usage has been increasing year by year. As a corrosion-resistant structural material used in chemical equipment, titanium has established its position, and as a material in chemical equipment, titanium has also attracted increasing attention from engineering and technical personnel.