Rare earth nano high-strength titanium and preparation method thereof

A nano and high-strength technology, applied in the field of material processing, can solve the problems of reduced material performance, high equipment and tooling requirements, and high volume content of nanocrystals that are easy to recover and grow.

Active Publication Date: 2021-07-06
ANSTEEL BEIJING RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the severe plastic deformation technology pursues high-volume nanocrystals, which requires a large amount of deformation on the material, the size of the prepared sample is small, and the requirements for equipment and tooling are high, so it has not been promoted in actual production.
Furthermore, pure titanium is not only used in the normal room temperature working environment, but also in the high temperature environment of hundreds of degrees Celsius. The high-volume nanocrystals prepared by severe plastic deformation are easy to recover and grow, which greatly reduces the performance of the material and leads to failure.

Method used

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  • Rare earth nano high-strength titanium and preparation method thereof
  • Rare earth nano high-strength titanium and preparation method thereof
  • Rare earth nano high-strength titanium and preparation method thereof

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preparation example Construction

[0026] The preparation method of the rare earth nano-high-strength titanium according to the embodiment of the present invention includes the following steps:

[0027] a. Vacuum smelting: adding yttrium to pure titanium for vacuum smelting, followed by heating and heat preservation;

[0028] b, primary forging: the ingot obtained in step a is subjected to primary forging;

[0029] c. Secondary forging: performing secondary forging on the ingot obtained in step b;

[0030] d. Heat-treating the cast ingot obtained in step c to obtain rare earth nanometer high-strength titanium.

[0031] According to the preparation method of rare earth nano high-strength titanium according to the embodiment of the present invention, 1. By adding a trace amount of rare earth yttrium element, the pure titanium is effectively purified in the smelting stage, and at the same time, the yttrium element forms a yttrium solid solution or a yttrium-containing phase in the matrix; On the one hand, the pu...

Embodiment 1

[0040] The rare earth element Y is effectively added to the pure titanium, and the Y accounts for 0.01wt% of the total mass. It is smelted in a vacuum consumable electric arc furnace, and then kept at 500° C. for 5 hours. Carry out one forging: the ingot is heated to 925°C, held for 3 hours, then out of the furnace for forging, two times of fire to complete the reversing, three upsetting and three pulling, and the unidirectional deformation of each fire is 51%, and the one time ingot is obtained. Secondary forging is carried out, the primary ingot is kept at 750°C for 0.5 hours, and the reversing six-pier and six-drawing forging is completed in 2 fires. The unidirectional deformation of each fire is 70%, and the secondary ingot is obtained. After the secondary ingot is cooled, it is annealed at 500° C. for 0.5 hour to obtain a rare earth nanometer high-strength titanium material.

[0041] Such as figure 1 Shown is the metallographic diagram of the ultra-fine-grained pure tita...

Embodiment 2

[0044] The rare earth element Y is effectively added to the pure titanium, and the Y accounts for 0.01wt% of the total mass. It is smelted in a vacuum consumable electric arc furnace, and then kept at 500° C. for 5 hours. Carry out a forging: the ingot is heated to 950°C, held for 1 hour, then out of the furnace for forging, and the reversing, three upsetting and three pulling are completed in one fire, and the unidirectional deformation is 60% per fire, and an ingot is obtained. Secondary forging is carried out, the primary ingot is kept at 750°C for 0.5 hours, and the reversing, six-pier and six-drawing forging is completed in 2 fires, and the unidirectional deformation is 50% per fire to obtain the secondary ingot. After the secondary ingot is cooled, it is annealed at 200°C for 20 hours. A rare-earth nanometer high-strength titanium material is obtained.

[0045] In the embodiment of the present invention, the tensile strength of titanium at room temperature is 700 MPa af...

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Abstract

The invention discloses a preparation method of rare earth nano high-strength titanium. The preparation method comprises the following steps of adding rare earth yttrium into pure titanium, smelting in vacuum, and carrying out primary forging, secondary forging and heat treatment to obtain the rare earth nano high-strength titanium. According to the preparation method, the advantages of metal ultra-fine grains and nanocrystalline are effectively combined through the mechanisms of rare earth refining as-cast structure, rare earth phase strengthening high-temperature performance, severe plastic deformation and the like, and the rare earth nano high-strength titanium material of submicron and nanocrystalline scales is successfully prepared through medium-low temperature rapid large-deformation forging and low-temperature annealing processes. The preparation method is simple in process, low in investment, high in efficiency and good in effect.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a rare-earth nano-high-strength titanium, and in particular, to a preparation method of the rare-earth nano-high-strength titanium. Background technique [0002] Pure titanium has the characteristics of low density, high specific strength, high corrosion resistance, excellent biocompatibility, etc., and has been widely used in chemical, marine, biomedical and other fields. However, compared with titanium alloys and other commonly used engineering structural materials, such as automobile steel, die steel, stainless steel, etc., the strength of pure titanium is lower, only more than 300 MPa, which limits the application field. High alloying is the traditional way of strengthening pure titanium, but on the one hand, high alloying greatly increases the cost of materials, on the other hand, it also makes the processing of alloys more difficult, and the overall cost incre...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C14/00C22F1/18B21J5/00
CPCC22C1/02C22C14/00C22F1/183B21J5/002
Inventor 胡钊华郭杰张天馨范玉婷耿乃涛陈永
Owner ANSTEEL BEIJING RES INST
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