Preparation method for high-strength pure titanium panels

Abstract

The invention provides a preparation method for high-strength pure titanium panels. The preparation method comprises the technological steps that 1, a pure titanium panel is subjected to constrained groove pressing severe plastic deformation at the room temperature by adopting a pressure-controllable testing machine; 2, the pure titanium panel is subjected to electric pulse annealing treatment during every pass of constrained groove pressing deformation; and 3, the high-strength pure titanium panel is obtained after treatment at the last pass of constrained groove pressing severe plastic deformation. According to the preparation method, the advantages of severe plastic deformation and electric pulse treatment are integrated, so that the problems that hard-deformation hexagonal closed-packed metal pure titanium can be hardly subjected to room-temperature severe plastic deformation, and cracking occurs during a deformation process are solved; the large-sized high-strength pure titanium panel can be prepared; and compared with the original pure titanium panel, the increasing rate of yield strength of the large-sized high-strength pure titanium panel exceeds 160% at most, and the increasing rate of extension strength exceeds 80% at most.

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 deformed pure titanium obtained by HPT method is very small in size, and it is difficult to prepare large-volume materials; 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 the grain and improve the strength of the material. However, the ECAP deformation of pure titanium is usually carried out at medium temperature, and it is still only applicable For the production of small-sized rods, there are still certain limitations for the preparation of large-sized pure titanium plates, and the consumption of molds is serious

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