A titanium alloy part with different microstructure distribution and its preparation method

Abstract

The invention belongs to the technical field related to the preparation of structural materials, and discloses a titanium alloy part with different microstructure distribution and a preparation method thereof. The method includes the following steps: (1) after placing the titanium alloy blank in a hydrogen treatment furnace, Vacuumize and fill the hydrogen treatment furnace with hydrogen, and raise the temperature of the furnace; (2) emit a laser beam to locally heat an area of ​​the titanium alloy billet that needs hydrogen, and heat it to a predetermined temperature and maintain it for a predetermined time. The current heated region of the titanium alloy blank is subjected to hydrogenation treatment; (3) gradually reducing the power of the laser beam until zero, and re-emitting the laser beam to heat and hydrogenate other areas of the titanium alloy blank that need to be hydrogenated; (4 ) sequentially carry out isothermal heat treatment and vacuum dehydrogenation on the titanium alloy blank after hydrogenation, and then obtain titanium alloy parts. The invention performs laser-assisted heating and hydrogen placement on the region where hydrogen needs to be placed on the titanium alloy, and can accurately control the distribution of microstructures through laser beams.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of structural materials, and more particularly, 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 the titanium alloy phase 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 structure, basket structure, dual-state structure and lamellar structure. In engineering research, the diversification of...

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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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