Preparation method of titanium alloy plate

Abstract

The invention discloses a preparation method of a titanium alloy plate. The preparation method comprises the following steps of hot continuous rolling; annealing for the first time; board splitting; welding; hot rolling; annealing for the second time; cold rolling; and annealing for the third time. The preparation method is started from a large titanium alloy plate blank, through effective combination of roll type production and plate type production, effective coupling of the processes such as the heating temperature, the heat treatment system and the heat preservation time is comprehensively considered, the yield is increased, the production period is shortened, and the effect of rapid batch production is achieved. Meanwhile, a ply rolling process is reasonably matched with a cold rolling process, so that the dimensional precision is optimally controlled, and the thickness tolerance is small; batch, efficient and stable production of alpha + beta type titanium alloy thin-specification plates is achieved; and the method has important significance in industrial batch delivery.

Description

technical field [0001] The invention relates to the technical field of titanium alloy material processing, in particular to a preparation method of a titanium alloy plate. Background technique [0002] With the rapid development of aerospace, shipbuilding, automobile and other industrial technologies, higher requirements are put forward for titanium alloy sheets. Due to the high specific strength of titanium alloys, large processing deformation resistance, and easy to produce work hardening and aging effects, the requirements for equipment and operations are high, especially the grain size and surface quality of the plates are difficult to control, process controllability and mass production. Less stable. [0003] In the related process, a quenching treatment is often carried out in the intermediate process of plate rolling to refine the grains. However, due to the thin thickness of the plate in the intermediate process, it is prone to severe distortion and deformation duri...

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Problems solved by technology

Due to the high specific strength of titanium alloys, large processing deformation resistance, and easy to produce work hardening and aging effects, the requirements for equipment and operations are high, especially the grain size and surface quality of the plates are difficult to control, process controllability and mass production. Poor stability

[0003] In the related process, a quenching treatment is often carried out in the intermediate process of plate rolling to refine the grains. However, due to the thin thickness of the plate in the intermediate process, it is prone to severe distortion and deformation during rapid cooling, which makes the subsequent workload of shaping, grinding, cutting, etc. Greatly increased, the difficulty of operability and stability control increases, which seriously restricts the flexibility and practicability of the process, and often results in incomplete removal of the surface oxide layer, affecting the shape, size and surface quality of the final plate

In addition, traditional titanium alloy plates mostly use hot rolling to form the final product. Due to the small specific heat capacity and poor thermal conductivity of titanium alloys, the temperature loss during hot rolling is fast, and the plasticity of the process is poor. The requirements are high, and the residual stress generated by uneven cooling will lead to deformation and cracking of the plate, which will have an adverse effect on the microstructure and surface quality of the final plate, which is not conducive to large-scale industrial production

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