Preparation method of equal-thickness ultrafine grain TC4 titanium alloy plate

Abstract

The invention relates to the technical field of metallurgy, in particular to a preparation method of an equal-thickness ultrafine grain TC4 titanium alloy plate. The preparation method comprises the steps that S1, plate blanks obtained after rolling and annealing are taken; S2, the plate blanks are grouped; S3, interfaces of the plate blanks are subjected to roughening treatment and cleaning, and then the following operation of S4 is executed on each group; S4, the plate blanks in each group are stacked into a plate layer, one side edge of each plate layer is welded, the other side edges of each plate layer are coated with anti-oxidation coatings, or all edges of the plate layers are subjected to vacuum seal welding, the hot rolling process is adopted for ply rolling and welding, final hot rolling is carried out till the thickness of the plate layers is equal to the original thickness of the plate blanks, and then air cooling is carried out; S5, if the plate layers need to be grouped again, the plate layers serve as new plate blanks to return to the step S2, and otherwise all the plate layers form a plate blank group to return to the step S3 till all the plate blanks are subjected to ply rolling into the plate; S6, the plate is subjected to heat treatment and then cooled. According to the method, the defects of the insufficient hot rolling deformation and deformation cracking and incomplete welding in the ply rolling process can be overcome, and the equal-thickness ultrafine grain plate can be prepared.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing an ultrafine-grained TC4 titanium alloy plate with equal thickness. Background technique [0002] TC4 (Ti-6Al-4V) titanium alloy has comprehensive properties such as low density, excellent high-temperature strength, biocompatibility, and corrosion resistance, and is widely used in many fields such as aerospace, automobile, and medical treatment. The preparation of ultra-fine-grained titanium alloy can significantly improve the mechanical properties, biocompatibility and superplastic forming ability. Become the key to expand the application field of titanium alloy. Wherein, the grain size of the ultrafine crystal is in the range of 0.1-1 μm. [0003] For the grain refinement of titanium alloys, the method of large plastic deformation is usually adopted at home and abroad to increase the processing deformation of the alloy in the two-phase region as much...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ultra-fine-grained TC4 titanium alloy plates with equal thickness, which can overcome the problem that the fine-grained structure is difficult to achieve due to insufficient deformation, and maintain the original thickness size. Due to the shortcomings of deformation cracking and incomplete welding, the prepared TC4 titanium alloy plate has high strength and high interface bonding strength

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