A kind of preparation method of high-strength pure titanium plate

Abstract

The invention provides a method for preparing a high-strength pure titanium plate. The process steps are: (1) Using a controllable pressure testing machine to limit the severe plastic deformation of the pure titanium plate at room temperature. The process parameters are: bending of the molding die The mold selects a tooth width of 1 to 5 mm, a tooth height of 1 to 5 mm, a deformation rate of 2 to 50 mm / min, and is deformed through 2 to 3 passes; (2) Electric pulse annealing is performed on the pure titanium plate between each pass to limit the molding deformation. Processing; (3) After the final pass of processing to limit severe plastic deformation of molding, high-strength pure titanium plates are obtained. The invention combines the advantages of severe plastic deformation with electric pulse processing to solve the problems of difficult-to-deform close-packed hexagonal pure titanium being difficult to undergo large plastic deformation at room temperature and cracking during the deformation process, and can prepare large-size, high-strength pure titanium plates. , compared with the original pure titanium plate, the yield strength increases by up to more than 160%, and the tensile strength increases by up to more than 80%.

Description

technical field [0001] The invention relates to a preparation method in the technical field of metal materials, in particular to a preparation method of high-strength pure titanium plate. Background technique [0002] With its low density, high specific strength and specific stiffness, good corrosion resistance, especially good high temperature durability and excellent biocompatibility, pure titanium is widely used in biomedicine, aerospace, automobile, biology, etc. field has been widely used. However, although pure titanium has good plasticity, its low strength as a bearing part, poor wear resistance, and difficulty in deformation at room temperature restrict the development and application of pure titanium. [0003] Grain refinement is an important way to improve material strength and comprehensive mechanical properties, and it is also the only method that can simultaneously increase material strength and improve material toughness. At present, there are many methods an...

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Problems solved by technology

[0004] However, for pure titanium with hexagonal close-packed metal, there are problems such as difficulty in severe plastic deformation and deformation cracking at room temperature due to the small number of slip systems.

At present, the severe plastic deformation method used for pure titanium mainly includes High Pressure Torsion (HPT), but the size of the deformed pure titanium obtained by HPT method is very small, and it is difficult to prepare large-volume materials; roll bonding (ARB) has strict requirements on the superimposed surface of the plate, the roll surface and the ambient atmosphere. This method is limited to the preparation of pure titanium composite thin strips, and the material composite interface is easy to cause cracks.

Equal channel angular pressing (ECAP) is a large plastic deformation process newly developed in recent years to refine grains and improve material strength. However, ECAP deformation of pure titanium is usually carried out at medium temperature, and still It is only suitable for the production of small-sized rods, and it still has certain limitations for the preparation of large-sized pure titanium plates, and the consumption of molds is serious

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