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The study of the formation and likelihood of the formation and hot rolling of titanium alloy semi-microjunction

It is well known that the formation of semi-microcrystalline and fibrous tissue is easy to form when the alloy is strong plastic deformation. Therefore, this paper studies the possibility of the formation and subsequent heat rolling of BT16 titanium alloy.

The structural strength and safety of titanium alloys must be ensured. The development trend of the application of titanium alloy is to improve the power of the complete set of equipment while reducing the metal loss of the structural parts and parts, and to meet certain mechanical performance requirements. Because by the traditional process can improve the strength of the structure, but lost the plastic at the same time, so is widely used in a variety of strong plastic deformation, can be and amorphous formation of fibrous tissue or half, at the same time also can improve the strength. According to the study, the semi-microcrystalline bt1-0 pure titanium was refined by grain refining and thermal stability, and the strength increased by three times (sigma 0.2 = 1010MPa, sigma B = 1110MPa, H mu = 3200MPa), and the plasticity was 6 %.

Research materials from (alpha + beta) BT16 Φ 25 mm titanium alloy rod on cutting the hot extrusion of 50 mm long blank. The structure of the billet is inhomogeneous, and the axis is an alpha + beta group (original figure 1 alpha and 6). Are near the surface of the layered organization, but is more of a decentralized organization (figure 1 б, grade 4). The surface microhardness is 2680MPa and 2470MPa on the axis. The finished products and semi-finished products can be hot rolled to ensure smaller porosity and fine grain structure. Due to the removal of the oxide and gas saturation layer in the final machining process, this method can cause the loss of the metal.

At present, the strong plastic deformation of raw billet is three to the forging pressure (upsetting), which is similar to the ABC squeezing. Billet at 600 ℃ in forging to 20 mm, then stock rotated 90 degrees, at 550 ℃ in forging to 20 mm, then rotate it 90 degree will be blank, in the 500 ℃ forging alpha (figure 2). After these procedures, the bar can be obtained with a length of 60mm and a cross section of 20 x 20mm. It can be seen that the volume of the blank is reduced by 2.2 percent, which is due to the reduction of porosity and removal of loose on the shaft, which makes the metal tight. The results show that the strong shaping deformation can form the semi-microstructure of BT16 titanium alloy billet. Strong plastic deformation is three to the forging deformation through the shaft deformation, then during 550-600 ℃ for no more than 80% of the total deformation of multichannel time rolling. After these deformation, a semi-microstructure of alpha phase with 25nm is formed, which can guarantee the microhardness of alloy up to 40%.

At the same time, the forming semi-micro structure contains internal stress, which can greatly reduce the plasticity of the material and even lead to cracks in the blank. In order to eliminate these defects, the compression ratio needs to be determined during rolling, and the final recrystallization is carried out.
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