Titanium alloy part with different microstructure distributions and preparation method thereof

Abstract

The invention belongs to the related technical field of structural material preparation, and discloses a titanium alloy part with different microstructure distributions and a preparation method thereof. The method comprises the following steps that (1) after a titanium alloy blank is placed in a hydrogen treatment furnace, the hydrogen treatment furnace is vacuumized and inflated with hydrogen, and the furnace temperature is increased; (2) a laser beam is emitted to locally heat an area, needing hydrogen treatment, of the titanium alloy blank, and after the area is heated to a preset temperature, the preset temperature is maintained for preset time so as to carry out hydrogen treatment on the current heated area of the titanium alloy blank; (3) the power of the laser beam is gradually reduced to zero, and the laser beam is re-emitted so as to carry out heating hydrogen treatment on the other areas, needing hydrogen treatment, of the titanium alloy blank; and (4) isothermal heat treatment and vacuum dehydrogenation are sequentially carried out on the titanium alloy blank subjected to hydrogen treatment, and then the titanium alloy part is obtained. According to the titanium alloy part and the preparation method thereof, laser-assisted heating hydrogen treatment is carried out on the area, needing hydrogen treatment, of a titanium alloy, and distributions of microstructures can be accurately controlled through the laser beam.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of structural materials, and more specifically relates to a titanium alloy part with different microstructure distributions and a preparation method thereof. Background technique [0002] As a new structural material, titanium alloy has comprehensive properties such as good heat resistance, high specific strength, and excellent corrosion resistance, and is widely used in aerospace, biomedical and other industries. According to the composition of titanium alloy phases and the types of stable alloying elements, titanium alloys are usually divided into three categories: α-type, β-type and α+β-type titanium alloys. In addition, titanium alloys usually have different microstructures. Generally, the microstructure types of titanium alloys are divided into equiaxed microstructures, basket microstructures, dual-state microstructures, and lamellar microstructures. Engineering research often...

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Problems solved by technology

Gradient heat treatment generally pretreats the material to a certain extent, and then performs different heat treatment operations on different parts of the material according to performance requirements. During the cooling process, different regions present different microstructures. Gradient heat treatment has extremely high requirements on the structure and process operation of heat treatment equipment. , generally used in the production of titanium alloy parts with symmetrical or regular distribution of microstructure; deformation heat treatment is the combination of deformation and heat treatment, that is, a certain heat treatment is performed on the titanium alloy blank to obtain the same structure (such as a basket structure), and then the blank Different parts are deformed with different deformation amounts, and finally different tissue distributions are obtained. However, it is relatively difficult to accurately control the deformation amount during the deformation process; the main method of thermal hydrogen treatment is gradient hydrogenation. In the past, gradient hydrogenation was usually heated. In the furnace, the billet is heated and hydrogenated as a whole, and finally a certain hydrogen concentration gradient is formed in different parts of the billet. It is generally difficult to control the microstructure distribution of parts at specific positions in gradient heat treatment, and it is difficult to form a macroscopic gradient structure.

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