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Fiber crystal toughened high-strength superfine crystal pure titanium and preparation method thereof

A technology of ultra-fine-grained pure titanium and fiber crystal, which is applied in the field of fiber-crystal toughening high-strength ultra-fine-grained pure titanium material and its preparation field, which can solve the problem of low industrial production efficiency, insufficient high strength and toughness of pure titanium, and small size of pure titanium block. and other problems, to achieve the effect of excellent fatigue resistance, overcoming the bottleneck of toughness performance, and strong practicability

Active Publication Date: 2019-09-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the existing pure titanium has insufficient high strength and toughness or the block size is small and cannot replace titanium alloy to meet the requirements of metal structural materials used in biomedical surgical implants or medical instruments, and the current preparation The pure titanium block prepared by the method is small, the industrial production efficiency is low, and the energy consumption is high

Method used

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  • Fiber crystal toughened high-strength superfine crystal pure titanium and preparation method thereof
  • Fiber crystal toughened high-strength superfine crystal pure titanium and preparation method thereof
  • Fiber crystal toughened high-strength superfine crystal pure titanium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Raw materials: coarse-grained pure titanium rods with a diameter of 56mm.

[0057] Follow the steps below to implement:

[0058] Step 1: Adjust the grain orientation by drawing one by one: select a drawing die with an outlet diameter of 48mm, and cold draw the initial coarse-grained pure titanium rod one by one, and the cold drawing temperature is 350°C.

[0059] Step 2: High-strain swaging: the first pass of swaging is to swage the 48mm-diameter titanium rod I obtained in step 1 to a diameter of 24mm, and the strain is about 1.38; the second pass is to turn the 24mm-diameter titanium rod to Forged to a diameter of 12mm, the strain is about 1.38, and the cumulative strain of two swivel forgings is about 2.77.

[0060] Step 3: Put the titanium rod ‖ with a diameter of 12 mm obtained in Step 2 in a vacuum furnace for recovery annealing at a temperature of 350° C. for 1 h.

[0061] Step 4: Multi-pass low-strain swaging: in the first pass, the titanium rod III with a diam...

Embodiment 2

[0068] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step 5 is 450° C., and the annealing time is extended to 30 minutes.

[0069] figure 1 The thin solid line in this case is the engineering stress-strain curve of the quasi-static tensile test along the swaging direction of the fiber crystal toughened high-strength ultra-fine-grained pure titanium prepared in this case. The yield strength is as high as 706.7MPa, and it has a very large work hardening rate. The tensile strength reaches 780.5MPa, the uniform plastic strain is 12.8%, and the elongation after fracture is greater than 21.3%. Compared with the properties obtained in Example 1, the strength is slightly reduced, but the plasticity is increased.

[0070] The microstructure is not significantly different from that of Example 1.

Embodiment 3

[0072] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step 5 is 500° C., and the time is 10 minutes.

[0073] Figure 5 It is the EBSD grayscale image of the fiber crystal toughened high-strength ultra-fine-grained pure titanium prepared in this implementation case. As indicated by the arrows, the material consists of fibrous crystals and equiaxed ultrafine grains. The statistical results in this area show that the average length of fiber crystals is 13.6 μm, the average aspect ratio is 17, and the volume ratio is about 40%; the average size of equiaxed ultrafine crystals is 0.56 μm. Compared with the results obtained in Example 1, the distribution of fiber crystals is more uniform.

[0074] Such as figure 1 The thick dotted line in this case is the engineering stress-strain curve of the quasi-static tensile test along the swaging direction of the fiber crystal toughened high-strength ultra-f...

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Abstract

The invention discloses fiber crystal toughened high-strength superfine crystal pure titanium and a preparation method thereof. The microstructure is formed by mixing fiber grains with isometric superfine grains, the length ratio of the long axes of the fiber crystal grains to the length of the short axes is greater than 10 and the size of the short axes is 200 nanometers to 3 microns, and the size of the isometric superfine grains is 50 nanometers to 1 microns. The volume fraction of the fiber grains is 20%-60%, the preparation method of the fiber crystal toughened high-strength superfine crystal pure titanium comprises the following steps that (1), the grain orientation of pure titanium is adjusted through one to two passes of drawing, so that a titanium rod material is obtained; (2), high-strain rotary forging is carried out in a one to three passes; (3), low-temperature annealing is carried out; (4), multi-pass low-strain rotary forging is carried out; and (5), the fiber crystal toughened high-strength superfine grain pure titanium is obtained after annealing. The strong toughness of the pure titanium prepared by the method is far higher than that of coarse grain pure titanium,the application of the alloy titanium in the aspect of biological implants and medical instruments can be preferably replaced, and the method is suitable for large-scale preparation of large-size pure titanium.

Description

technical field [0001] The invention relates to the technical field of metal structural materials for biomedical surgical implants or medical instruments, in particular to a fiber crystal toughened high-strength ultra-fine crystal pure titanium material and a preparation method thereof. Background technique [0002] Pure titanium material has excellent biocompatibility and corrosion resistance of antibody liquid environment. Compared with alloyed titanium, pure titanium not only avoids the harmful side effects of alloying elements such as Al, V, Cr, and Co on organisms, but also avoids the high cost of alloying elements such as Nb, Ta, and Mo. But so far, the clinical application of pure titanium is still far less than that of alloy titanium. The core reason for this problem is that the strength, fatigue resistance and wear resistance of conventional pure titanium are lower than those of alloy titanium. For example, the yield strengths of TA1 (Grade 1) and TA2 (Grade 2) pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C47/00C22C49/11C22C49/14C22C111/02
CPCC22C47/00C22C49/11C22C49/14C22C2047/005C22F1/183
Inventor 黄崇湘王艳飞王明赛
Owner SICHUAN UNIV
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